1. The inorganic zinc-rich primer is characterized by comprising the following components in percentage by weight: 15-30% of high-modulus potassium silicate solution, 0.1-1.5% of stabilizer, 4-12% of thickener, 0-0.5% of dispersant, 0.1-0.4% of defoaming agent and 60-80% of zinc powder.

2. The inorganic zinc rich primer according to claim 1, comprising the following components in percentage by weight: 20-25% of high-modulus potassium silicate solution, 0.2-1% of stabilizer, 8-12% of thickener, 0.2-0.5% of dispersant, 0.1-0.4% of defoaming agent and 60-80% of zinc powder.

3. The inorganic zinc rich primer according to claim 1 or 2, wherein the stabilizer is one of a tertiary amine compound, a quaternary ammonium compound or a stabilizer a, preferably a stabilizer a.

4. The inorganic zinc rich primer according to claim 3, wherein the stabilizer A is prepared by the following steps: adding a silane coupling agent into water, hydrolyzing at 30-40 ℃ for 2-3 hours, adding quaternary ammonium base, and continuously reacting for 1-2 hours to obtain a stabilizer A, wherein the silane coupling agent accounts for 2-4 wt%, the quaternary ammonium base accounts for 1-3 wt%, and the balance is water.

5. The inorganic zinc-rich primer according to claim 4, wherein the silane coupling agent is one or more of methyltrimethoxysilane, vinyltrimethoxysilane, dimethyldimethoxysilane, methyltriethoxysilane and vinyltriethoxysilane, and preferably, the quaternary ammonium base is prepared from quaternary ammonium salt.

6. The inorganic zinc rich primer according to any one of claims 1 to 5 wherein the high modulus potassium silicate solution has a modulus of 3.9 to 6.0, preferably a solids content of 20% to 30%.

7. The inorganic zinc rich primer according to any one of claims 1 to 6, wherein the thickener is a water-based bentonite and/or a cellulose ether.

8. The inorganic zinc rich primer according to any one of claims 1-7, wherein the dispersant is a polymeric dispersant.

9. The inorganic zinc rich primer of any one of claims 1-8, wherein the defoamer is a silicone defoamer.

10. The inorganic zinc-rich primer according to any one of claims 1-9, wherein the zinc powder is spherical zinc powder, preferably with a particle size of 500-800 mesh.

11. A method of preparing an inorganic zinc rich primer according to any one of claims 1 to 10, comprising the steps of: mixing the high-modulus potassium silicate solution, the stabilizer, the thickener, the dispersant and the defoamer to obtain a base material of the inorganic zinc-rich primer, and then mixing the base material with zinc powder to obtain the inorganic zinc-rich primer.

12. A stabilizer a for the inorganic zinc rich primer of claim 1, wherein the stabilizer a is prepared by the steps of: adding a silane coupling agent into water, hydrolyzing at 30-40 ℃ for 2-3 hours, adding quaternary ammonium base, and continuously reacting for 1-2 hours to obtain a stabilizer A, wherein the silane coupling agent accounts for 2-4 wt%, the quaternary ammonium base accounts for 1-3 wt%, and the balance is water.

Background

The annual output of metal equipment and materials scrapped due to corrosion in China is 20% -40% of the annual output, so that the prevention of the corrosion of metals becomes a great problem in the technical field. At present, five measures such as material replacement, corrosion-resistant material selection, corrosion inhibitor addition, cathodic protection, anode sacrifice and coating protection on metal materials are mainly adopted for metal protection, wherein the most common method is to coat a layer of protective material on the metal surface.

The inorganic zinc-rich primer is an anticorrosive paint prepared by taking an alkali metal silicate aqueous solution as a base material, taking metal zinc powder as a main antirust filler and adding various pigments and additives. Because the standard potential of zinc is lower than that of steel, when corrosive medium infiltrates, the steel and zinc powder form a primary battery, the zinc powder as the negative electrode of the primary battery loses electrons, and the steel as the positive electrode is protected by electrons. Meanwhile, the dissolved zinc ions and the alkali metal silicate solution form basic zinc salt and zinc-iron double salt, and gaps are filled up, so that further permeation of corrosive media is blocked, and the purpose of isolation and rust prevention is achieved. Due to its unique protection mechanism, it is widely used in the protection of steel structures.

As the base material in the inorganic zinc-rich primer is an alkali metal silicate aqueous solution, the number of silicon hydroxyl groups in the alkali metal silicate aqueous solution is increased along with the increase of the modulus, and the silicon hydroxyl groups are polymerized along with the change of time, the base material is gradually changed into a gel state, and the storage stability of the inorganic zinc-rich primer is directly influenced. In addition, zinc powder has poor dispersibility in an alkali metal silicate aqueous solution, poor compatibility with a matrix, and is likely to precipitate in a silicate aqueous solution due to its high density, thereby directly affecting the use of the inorganic zinc-rich primer. Meanwhile, the length of the working life also has certain influence on the construction process of the inorganic zinc-rich primer.

Disclosure of Invention

The technical problems to be solved by the invention are as follows: the prior art lacks an inorganic zinc-rich primer which has good storage stability, good zinc powder dispersion, good system compatibility, difficult zinc powder sedimentation and long service life.

Aiming at the defects in the prior art, the invention aims to provide an inorganic zinc-rich primer, the invention aims to provide a preparation method of the inorganic zinc-rich primer, and the invention aims to provide a stabilizer A for the inorganic zinc-rich primer.

The technical scheme of the invention is as follows:

the invention provides an inorganic zinc-rich primer, which comprises the following components in percentage by weight: 15-30% of high-modulus potassium silicate solution, 0.1-1.5% of stabilizer, 4-12% of thickener, 0-0.5% of dispersant, 0.1-0.4% of defoaming agent and 60-80% of zinc powder.

Preferably, the inorganic zinc-rich primer comprises the following components in percentage by weight: 20-25% of high-modulus potassium silicate solution, 0.2-1% of stabilizer, 8-12% of thickener, 0.2-0.5% of dispersant, 0.1-0.4% of defoaming agent and 60-80% of zinc powder.

Preferably, the stabilizer is one of a tertiary amine compound, a quaternary ammonium compound or a stabilizer a, preferably a stabilizer a.

Preferably, the stabilizer A is prepared by the following steps: adding a silane coupling agent into water, hydrolyzing at 30-40 ℃ for 2-3 hours, adding quaternary ammonium base, and continuing to react for 1-2 hours to obtain a stabilizer A, wherein the silane coupling agent is added in an amount of 2-4 wt%, the quaternary ammonium base is added in an amount of 1-3 wt%, and the balance is water.

Preferably, the silane coupling agent is one or more of methyltrimethoxysilane, vinyltrimethoxysilane, dimethyldimethoxysilane, methyltriethoxysilane and vinyltriethoxysilane, preferably, the quaternary ammonium base is prepared from quaternary ammonium salt, and preferably, the quaternary ammonium salt is dispersion stabilizer SPS.

Preferably, the high modulus potassium silicate solution has a modulus of 3.9 to 6.0, preferably a solids content of 20% to 30%.

Preferably, the high modulus potassium silicate solution is obtained by:

(1) mixing the low-modulus potassium silicate solution and the silica sol, heating to 40-80 ℃, reacting for 1-3h, then cooling to 35-55 ℃, and preserving heat for 0.5-1 h;

(2) adding water and a quaternary ammonium salt stabilizer into the mixed solution to obtain a high-modulus potassium silicate solution;

wherein, the low modulus potassium silicate solution is 100 parts, the silica sol is 8-60 parts, and the quaternary ammonium salt stabilizer is 1-15 parts.

Preferably, the thickener is an aqueous bentonite and/or a cellulose ether.

Preferably, the dispersant is a polymeric dispersant.

Preferably, the defoamer is a silicone defoamer.

Preferably, the zinc powder is spherical zinc powder, and the particle size is preferably 500-800 meshes.

The invention also provides a preparation method of the inorganic zinc-rich primer, which comprises the following steps: mixing the high-modulus potassium silicate solution, the stabilizer, the thickener, the dispersant and the defoamer to obtain a base material of the inorganic zinc-rich primer, and then mixing the base material with zinc powder to obtain the inorganic zinc-rich primer.

The invention also provides a stabilizer A for the inorganic zinc-rich primer, which is prepared by the following steps: adding a silane coupling agent into water, hydrolyzing at 30-40 ℃ for 2-3 hours, adding quaternary ammonium base, and continuing to react for 1-2 hours to obtain a stabilizer A, wherein the silane coupling agent is added in an amount of 2-4 wt%, the quaternary ammonium base is added in an amount of 1-3 wt%, and the balance is water.

The invention has the beneficial effects that:

the base material of the inorganic zinc-rich primer can be stably stored in a baking oven at 50 +/-2 ℃ for 15 days or even 60 days without gelation, the zinc powder has good dispersibility and compatibility in the base material, the sedimentation height of the zinc powder in the system is less than 8mm/h, and the service life of the primer exceeds 5 hours or even reaches 24 hours. The reagent used in the invention is nontoxic, harmless and free of pungent smell, and the prepared inorganic zinc-rich primer is zero in VOC and environment-friendly. The preparation method can be completed at room temperature, the preparation process is simple and easy to operate, and no toxic or harmful substances are generated in the preparation process.

Detailed Description

In order to better understand the technical solutions, the technical solutions of the present application are described in detail with specific embodiments below, and it should be understood that the specific features in the embodiments and examples of the present application are detailed descriptions of the technical solutions of the present application, but not limitations of the technical solutions of the present application, and the technical features in the embodiments and examples of the present application may be combined with each other without conflict.

The invention provides an inorganic zinc-rich primer, which comprises the following components in percentage by weight: 15-30% of high-modulus potassium silicate solution, 0.1-1.5% of stabilizer, 4-12% of thickener, 0-0.5% of dispersant, 0.1-0.4% of defoaming agent and 60-80% of zinc powder.

Preferably, the inorganic zinc-rich primer comprises the following components in percentage by weight: 20-25% of high-modulus potassium silicate solution, 0.2-1% of stabilizer, 8-12% of thickener, 0.2-0.5% of dispersant, 0.1-0.4% of defoaming agent and 60-80% of zinc powder.

Preferably, the stabilizer is one of a tertiary amine compound, a quaternary ammonium compound or a stabilizer a, preferably a stabilizer a.

Preferably, the stabilizer A is a silane coupling agent stabilizer, and is prepared by the following method: adding a silane coupling agent into water, hydrolyzing at 30-40 ℃ for 2-3 hours, adding quaternary ammonium base, and continuing to react for 1-2 hours to obtain a stabilizer A, wherein the silane coupling agent is added in an amount of 2-4 wt%, the quaternary ammonium base is added in an amount of 1-3 wt%, and the balance is water.

Preferably, the silane coupling agent is one or more of methyltrimethoxysilane, vinyltrimethoxysilane, dimethyldimethoxysilane, methyltriethoxysilane and vinyltriethoxysilane, preferably, the quaternary ammonium base is prepared from quaternary ammonium salt, and preferably, the quaternary ammonium salt is dispersion stabilizer SPS. The quaternary ammonium base is prepared by adopting the dispersion stabilizer SPS so as to prepare the stabilizer A, so that the stabilizer A is non-toxic and harmless, and the stability, the system compatibility and the zinc powder dispersibility of the system are enhanced.

The high-modulus potassium silicate solution has a large amount of active silicon hydroxyl groups, so that the viscosity of the high-modulus potassium silicate solution can rise in a short time.

Preferably, the high modulus potassium silicate solution has a modulus of 3.9 to 6.0, preferably a solids content of 20% to 30%. The potassium silicate has higher solidifying and film forming speed along with the increase of the modulus, and has good application property.

The preparation method of the high-modulus potassium silicate solution used by the invention comprises the following steps:

(1) mixing the low-modulus potassium silicate solution and the silica sol, heating to 40-80 ℃, reacting for 1-3h, then cooling to 35-55 ℃, and preserving heat for 0.5-1 h;

(3) adding water and a quaternary ammonium salt stabilizer into the mixed solution to obtain a high-modulus potassium silicate solution;

wherein, the low modulus potassium silicate solution is 100 parts, the silica sol is 8-60 parts, and the quaternary ammonium salt stabilizer is 1-15 parts.

Preferably, the thickener is an aqueous bentonite and/or a cellulose ether. For example: the water-based bentonite SMP-X40 and SMP-X70 are obtained from Zhejiang Fenghong New materials, the cellulose ethers HS100000YP2, HS30000YP2 and AS-200 are obtained from Shanghai Australian chemical industries, Inc., the cellulose ethers CMC LV, HEC-33 and HEC-103 are obtained from Feicheng Yutian chemical industries, Inc., and the cellulose ether SR-800 is obtained from Shudedistrict Lotus chemical industries, Inc., of Foshan city.

Preferably, the dispersant is a polymeric dispersant. For example: WY001 and CD3060 are available from Shanghai ProbeIng materials Co,-190 andDISPERSA-NT-192 is available from south China chemical Co., Ltd.

Preferably, the defoamer is a silicone defoamer, such as: XF-801, Chinfo chemical Co., Ltd.

Preferably, the zinc powder is spherical zinc powder, and the particle size is preferably 500-800 meshes.

The invention also provides a preparation method of the inorganic zinc-rich primer, which comprises the following steps: mixing the high-modulus potassium silicate solution, the stabilizer, the thickener, the dispersant and the defoamer to obtain a base material of the inorganic zinc-rich primer, and then mixing the base material with zinc powder to obtain the inorganic zinc-rich primer.

The inorganic zinc rich primer and the preparation method thereof according to the present invention will be specifically described by specific examples and experimental examples.

The inventive examples and comparative examples used starting materials and equipment sources as shown in table 1.

TABLE 1 examples of the invention and comparative examples use sources of raw materials and equipment

Example 1

(1) Preparation of high modulus potassium silicate solution

Weighing 100kg of low-modulus potassium silicate solution, adding the low-modulus potassium silicate solution into a reactor, then adding 8.69kg of silica sol solution, and heating the system to 40 ℃ under the stirring state; keeping the mixture in a vortex stirring state for 3 hours at 40 ℃, and then cooling the system to 35 ℃ for 0.5 hour; 18.64kg of water and 1kg of a quaternary ammonium salt stabilizer CS1 were added to the reactor, and the vortex state was continued and the stirring was continued for 0.5 hour to obtain a modified high modulus potassium silicate solution. The mass fraction of the high modulus potassium silicate solution is 30%, and the modulus is 3.9.

(2) Preparation of inorganic zinc-rich primer

Weighing 15kg of the high-modulus potassium silicate solution prepared in the step (1), adding the solution into a reactor with a stirring device, adding 0.1kg of a stabilizer 827 under a stirring state, and stirring for 1 hour; then respectively adding 6kg of cellulose ether CMC LV and 0.1kg of defoamer XF-801 into the reaction kettle, and continuously stirring for 0.5 hour to obtain a base material of the inorganic zinc-rich primer; the base material of the inorganic zinc-rich primer obtained above was placed in a paint mixing pot, and 78.8kg of 500 mesh (Taylor sieve, the same applies below) spherical zinc powder was added while stirring to prepare an inorganic zinc-rich primer.

Example 2

(1) Preparation of high modulus potassium silicate solution

Weighing 100kg of low-modulus potassium silicate solution, adding the low-modulus potassium silicate solution into a reactor, then adding 58.11kg of silica sol solution, and heating the system to 80 ℃ under the stirring state; keeping the mixture in a vortex stirring state for 1 hour at 80 ℃, and then cooling the system to 55 ℃ for 1 hour; 95.74kg of water and 15kg of a quaternary ammonium salt stabilizer CS1 were added to the reactor, and the vortex state was continued and the mixture was stirred for 1 hour to obtain a modified high modulus potassium silicate solution. The modified high-modulus potassium silicate solution has a mass fraction of 20% and a modulus of 6.0.

(2) Preparation of inorganic zinc-rich primer

Weighing 20kg of the high-modulus potassium silicate solution prepared in the step (1), adding the solution into a reactor with a stirring device, adding 0.2kg of tetrabutylammonium hydroxide under the stirring state, and stirring for 2 hours; then adding 8kg of cellulose ether HEC-33, 0.2kg of dispersant WY001 and 0.3kg of defoamer XF-801 into the reaction kettle respectively, and continuing stirring for 1 hour to obtain a base material of the inorganic zinc-rich primer; the base material of the inorganic zinc-rich primer obtained above was placed in a paint mixing tank, and 71.3kg of 800 mesh spherical zinc powder was added while stirring to prepare the inorganic zinc-rich primer.

Example 3

(1) Preparation of high modulus potassium silicate solution

The procedure is as in example 2.

(2) Preparation of stabilizer A

Weighing 100g of SPS (dispersion stabilizer), adding 1g of potassium hydroxide, and stirring for 30 minutes to obtain quaternary ammonium base for later use;

200g of methyltrimethoxysilane is weighed and added into 9700g of water, the hydrolysis is carried out for 2 hours at the temperature of 30 ℃, 100g of the quaternary ammonium hydroxide prepared is added, and the reaction is continued for 1 hour to obtain the stabilizing agent A.

(3) Preparation of inorganic zinc-rich primer

Weighing 20kg of the high-modulus potassium silicate solution prepared in the step (1), adding the solution into a reactor with a stirring device, adding 0.2kg of the stabilizer A prepared in the step (2) under a stirring state, and stirring for 2 hours; then adding 8kg of cellulose ether HEC-33, 0.2kg of dispersant WY001 and 0.3kg of defoamer XF-801 into the reaction kettle respectively, and continuing stirring for 1 hour to obtain a base material of the inorganic zinc-rich primer; the base material of the inorganic zinc-rich primer obtained above was placed in a paint mixing tank, and 71.3kg of 800 mesh spherical zinc powder was added while stirring to prepare the inorganic zinc-rich primer.

Example 4

(1) Preparation of high modulus potassium silicate solution

Weighing 100kg of low-modulus potassium silicate solution, adding into a reactor, then adding 34.58kg of silica sol solution, and heating the system to 60 ℃ under the stirring state; keeping the mixture in a vortex stirring state for 2 hours at 60 ℃, and then cooling the system to 40 ℃ and keeping for 1 hour; 45.57kg of water and 5kg of a quaternary ammonium salt stabilizer CS1 are added into the reactor, the vortex state is continuously kept, and the stirring is carried out for 1 hour, so as to obtain the modified high-modulus potassium silicate solution. The modified high-modulus potassium silicate solution has a mass fraction of 25% and a modulus of 5.0.

(2) Preparation of stabilizer A

Weighing 300g of SPS (dispersion stabilizer), adding 3g of potassium hydroxide, and stirring for 30 minutes to obtain quaternary ammonium base for later use;

400g of vinyltrimethoxysilane is weighed and added into 9300g of water, the mixture is hydrolyzed at 40 ℃ for 3 hours, 300g of the quaternary ammonium hydroxide prepared is added, and the reaction is continued for 2 hours to obtain the stabilizer A.

(3) Preparation of inorganic zinc-rich primer

Weighing 25kg of the high-modulus potassium silicate solution prepared in the step (1), adding the solution into a reactor with a stirring device, adding 1kg of the stabilizer A prepared in the step (2) under a stirring state, and stirring for 2 hours; then 12kg of thickening agent SMP-X40 and 0.5kg of dispersing agent are respectively added into the reaction kettle190 and 0.2kg of defoamer XF-801, and continuously stirring for 1 hour to obtain a base material of the inorganic zinc-rich primer; the base material of the inorganic zinc-rich primer obtained above was put in a paint mixing pot, and 61.3kg60 was added while stirring0 mesh of spherical zinc powder to prepare the inorganic zinc-rich primer.

Example 5

(1) Preparation of high modulus potassium silicate solution

Same procedure as in example 4

(2) Preparation of stabilizer A

Same procedure as in example 4

(3) Preparation of inorganic zinc-rich primer

Weighing 30kg of the high-modulus potassium silicate solution in the formula (1), adding the high-modulus potassium silicate solution into a reactor with a stirring device, adding 2kg of the stabilizer A in the formula (2) under a stirring state, and stirring for 2 hours; then 7.3kg of cellulose ether SR-800 and 0.3kg of dispersing agent are respectively added into the reaction kettleDISPERSANT-192 and 0.4kg of defoamer XF-801, and continuously stirring for 1 hour to obtain a base material of the inorganic zinc-rich primer; the base material of the inorganic zinc-rich primer obtained above was placed in a paint mixing tank, and 60kg of 600 mesh spherical zinc powder was added while stirring to prepare the inorganic zinc-rich primer.

Example 6

(1) Preparation of high modulus potassium silicate solution

Same procedure as in example 4

(2) Preparation of stabilizer A

Same procedure as in example 4

(3) Preparation of inorganic zinc-rich primer

Weighing 26kg of the high-modulus potassium silicate solution prepared in the step (1), adding the weighed solution into a reactor with a stirring device, adding 1.5kg of the stabilizer A prepared in the step (2) under the stirring state, and stirring for 1.5 hours; then respectively adding 4kg of cellulose ether HS100000YP2, 0.4kg of dispersing agent CD3060 and 0.2kg of defoaming agent XF-801 into the reaction kettle, and continuously stirring for 45 minutes to obtain a base material of the inorganic zinc-rich primer; the base material of the inorganic zinc-rich primer obtained above was placed in a paint mixing pot, and 67.9kg of 700 mesh spherical zinc powder was added while stirring to prepare the inorganic zinc-rich primer.

Example 7

(1) Preparation of high modulus potassium silicate solution

Same procedure as in example 4

(2) Preparation of stabilizer A

Same procedure as in example 4

(3) Preparation of inorganic zinc-rich primer

Weighing 17kg of the high-modulus potassium silicate solution prepared in the step (1), adding the weighed solution into a reactor with a stirring device, adding 0.5kg of the stabilizer A prepared in the step (2) under a stirring state, and stirring for 2 hours; then adding 9kg of cellulose ether AS-200, 0.4kg of dispersing agent CD3060 and 0.2kg of defoaming agent XF-801 into the reaction kettle respectively, and continuing stirring for 1 hour to obtain a base material of the inorganic zinc-rich primer; the base material of the inorganic zinc-rich primer obtained above was placed in a paint mixing tank, and 72.9kg of 600 mesh spherical zinc powder was added while stirring to prepare the inorganic zinc-rich primer.

Comparative example 1

(1) Preparation of high modulus potassium silicate solution

The procedure is as in example 2.

(2) Preparation of inorganic zinc-rich primer

Weighing 35kg of the high-modulus potassium silicate solution prepared in the step (1), adding the solution into a reactor with a stirring device, adding 0.2kg of tetrabutylammonium hydroxide under the stirring state, and stirring for 2 hours; then adding 8kg of cellulose ether HEC-33, 0.2kg of dispersant WY001 and 0.3kg of defoamer XF-801 into the reaction kettle respectively, and continuing stirring for 1 hour to obtain a base material of the inorganic zinc-rich primer; the base material of the inorganic zinc-rich primer obtained above was placed in a paint mixing tank, and 56.3kg of 800 mesh spherical zinc powder was added while stirring to prepare the inorganic zinc-rich primer.

Comparative example 2

(1) Preparation of high modulus potassium silicate solution

The procedure is as in example 2.

(2) Preparation of inorganic zinc-rich primer

Weighing 13kg of the high-modulus potassium silicate solution prepared in the step (1), adding the solution into a reactor with a stirring device, adding 0.2kg of tetrabutylammonium hydroxide under the stirring state, and stirring for 2 hours; then adding 8kg of cellulose ether HEC-33, 0.2kg of dispersant WY001 and 0.3kg of defoamer XF-801 into the reaction kettle respectively, and continuing stirring for 1 hour to obtain a base material of the inorganic zinc-rich primer; the base material of the inorganic zinc-rich primer is placed in a paint mixing tank, and 78.3kg of 800-mesh spherical zinc powder is added while stirring, so that the inorganic zinc-rich primer is prepared.

Comparative example 3

(1) Preparation of high modulus potassium silicate solution

The procedure is as in example 1.

(2) Preparation of inorganic zinc-rich primer

Weighing 15kg of the high-modulus potassium silicate solution prepared in the step (1), adding the solution into a reactor with a stirring device, then respectively adding 6kg of cellulose ether CMC LV and 0.1kg of defoamer XF-801 into the reaction kettle, and continuously stirring for 0.5 hour to obtain a base material of the inorganic zinc-rich primer; the base material of the inorganic zinc-rich primer obtained above was placed in a paint mixing tank, and 78.9kg of 500 mesh spherical zinc powder was added while stirring to prepare the inorganic zinc-rich primer.

Comparative example 4

(1) Preparation of high modulus potassium silicate solution

Same procedure as in example 4

(2) Preparation of stabilizer A

Same procedure as in example 4

(3) Preparation of inorganic zinc-rich primer

26kg of the high-modulus potassium silicate solution prepared in (1) is weighed and added into a reactor with a stirring device, 1.6kg of the stabilizer A prepared in (2) is added under stirring, and the mixture is stirred for 1.5 hours; then respectively adding 4kg of cellulose ether HS100000YP2, 0.4kg of dispersing agent CD3060 and 0.2kg of defoaming agent XF-801 into the reaction kettle, and continuously stirring for 45 minutes to obtain a base material of the inorganic zinc-rich primer; the base material of the inorganic zinc-rich primer obtained above was placed in a paint mixing pot, and 67.8kg of 700 mesh spherical zinc powder was added while stirring to prepare the inorganic zinc-rich primer.

Experimental example 1

The stability of the inorganic zinc rich primer binders of examples 1-7 and comparative examples 1-4, the dispersibility and compatibility of the zinc powder in the binder, the settling properties of the zinc powder in the binder, and the pot life of the inorganic zinc rich primer were determined.

The stability of the inorganic zinc-rich primer base was determined as follows: the base was placed in an oven at 50. + -. 2 ℃ and the state of the base (whether gelled) was observed every 5 days, and the time at which the gel became recorded.

The dispersibility and compatibility of zinc powders in the binder were determined as follows: mixing zinc powder and a base material according to a certain proportion for a certain time, observing whether the zinc powder is agglomerated in the base material or not, and investigating the compatibility of the zinc powder; and (4) carrying out a spraying experiment on the mixed primer, observing whether the surface of the paint film is flat or not, and inspecting the dispersibility of the paint film.

The settling properties of zinc powder in the binder were determined as follows: after zinc powder and base material are stirred and mixed according to the proportion, the mixture is quantitatively (volumetrically) filled into test tubes of the same type, sealed and kept stand, and after the mixture is stored in a test tube rack for one hour, the height h of a supernatant layer is recorded.

The pot life of the inorganic zinc-rich primer was determined according to the test method of 5.8 pot life in HG/T3668-2009: the temperature of each component of the product is adjusted to (23 +/-2) DEG C in advance, then the components are uniformly mixed according to a specified proportion, 300mL of the mixture is taken out and put into a well-sealed metal container, the container is placed at the temperature of (23 +/-2) DEG C for a specified time, and then the state, the application property (the application property after the proper amount of diluent is added to adjust the spraying viscosity if necessary) and the appearance of a coating film of the primer are inspected. If the primer has no hard block, the spraying is not difficult, and the appearance of the coating film is normal, the time is the working life of the inorganic zinc-rich primer.

The results of the performance tests of examples 1 to 7 and comparative examples 1 to 4 are shown in Table 2.

TABLE 2 results of various property tests of examples 1 to 7 and comparative examples 1 to 4

As shown in Table 2, the inorganic zinc-rich primer prepared in the examples 1-7 of the present invention has a base material stability of over 15 days, a zinc powder dispersibility and a zinc powder compatibility in the base material are good, a paint film is relatively flat and has no hard lumps, a zinc powder sedimentation height in the base material is below 8mm/h, and a pot life is above 5 hours. And the examples 3-7 added with the stabilizer A have better effect, the stability of the base material can reach more than 30 days, and the pot life can reach more than 8 hours. Compared with the example 2, the inorganic zinc-rich primer prepared by the component of 35 weight percent of the high-modulus potassium silicate in the comparative example 1 has the advantages that the dispersion and compatibility of the zinc powder in the base material are reduced, the sedimentation height of the zinc powder in the base material is obviously increased, the stabilization time of the base material is obviously shortened, and the working life is slightly shortened; compared with the example 2, the inorganic zinc-rich primer prepared by the component of the high-modulus potassium silicate of which the weight percentage is 13 percent in the comparative example 2 has the advantages that the dispersion and compatibility of the zinc powder in the base material are reduced, the sedimentation height of the zinc powder in the base material is obviously increased, the working life is obviously shortened, and the stabilization time of the base material is slightly shortened; compared with the example 1, the inorganic zinc-rich primer of the base material prepared by the comparative example 3 without adding the stabilizer has obviously shortened stabilization time and pot life; compared with example 6, the stabilizer of comparative example 4 has a weight percentage of 1.6%, the dispersion and compatibility of zinc powder in the base material are reduced, the sedimentation height of the zinc powder in the base material is obviously increased, and the stabilization time and the pot life of the base material are obviously shortened.

In conclusion, the base material of the inorganic zinc-rich primer can be stably stored in an oven at 50 +/-2 ℃ for 15 days or even 60 days without gelation, the zinc powder has good dispersibility and compatibility in the base material, the sedimentation height of the zinc powder in the system is less than 8mm/h, and the working life of the primer is more than 5 hours or even up to 24 hours.

The foregoing is considered as illustrative and not restrictive in character, and that various modifications, equivalents, and improvements made within the spirit and principles of the invention are intended to be included within the scope of the invention.