1. The antibacterial color master batch is characterized in that: the paint comprises the following components in parts by weight: 20-30 parts of pigment, 8-12 parts of dispersing agent, 30-40 parts of low-melt-strength EVA colloidal particles, 10-15 parts of nano zinc oxide-low molecular weight polypropylene compound and 5-8 parts of silver-containing antibacterial agent.

2. The antimicrobial color masterbatch of claim 1, wherein: the pigment is one of carbon black, titanium dioxide, iron oxide yellow and molybdenum chrome red.

3. The antimicrobial color masterbatch of claim 1, wherein: the dispersing agent is polyethylene wax, ethylene bisstearamide or pentaerythritol stearate.

4. The antimicrobial color masterbatch of claim 1, wherein: the environment-friendly color master batch further comprises 2-5 parts of a heat stabilizer, wherein the heat stabilizer is epoxy glyceride, epoxy fatty ester, calcium stearate or zinc stearate.

5. The antimicrobial color masterbatch of claim 1, wherein: the environment-friendly color master batch further comprises 0.5-1 part of antioxidant, wherein the antioxidant is one or more of 3114, 1010 and DSTP.

6. The antimicrobial color masterbatch of claim 1, wherein: the low melt strength EVA colloidal particles are one or more of Taiwan poly 7350, Taiwan poly 7470 and Taiwan poly 3312.

7. The antimicrobial color masterbatch of claim 1, wherein: the preparation method of the nano zinc oxide-low molecular weight polypropylene compound comprises the following steps: using zinc acetate as a precursor and dissolving the zinc acetate in 2.5% glacial acetic acid water solution to prepare a zinc acetate solution with the mass concentration of 10%; mixing low molecular weight polypropylene and high boiling point oil solution in a reactor, heating and melting, dropwise adding zinc acetate solution under continuous high-speed stirring, wherein the reaction temperature is 200-250 ℃, and the dropwise adding amount is 0.1-0.2 g of zinc acetate solution per gram of low molecular weight polypropylene, so as to obtain the nano zinc oxide-low molecular weight polypropylene compound.

8. The antimicrobial color masterbatch of claim 7, wherein: the molecular weight of the low molecular weight polypropylene in the nano zinc oxide-low molecular weight polypropylene compound is 4000-5000.

9. The antimicrobial color masterbatch of claim 1, wherein: the preparation method of the silver-containing antibacterial agent comprises the following steps: dispersing 100 parts by weight of 300-500-mesh marble powder in distilled water, adding 3-5 parts by weight of 10% silver nitrate solution by mass percentage, uniformly stirring, and dropwise adding 3-5 parts by weight of 10% sodium borohydride solution by mass percentage until the mixed solution is green; standing, filtering the mixed solution, washing, and drying at 200-300 ℃ to obtain the powdery silver-containing antibacterial agent.

10. A process for the preparation of an antimicrobial masterbatch according to any one of claims 1 to 9, wherein: the method comprises the following specific steps:

1) preparing materials: weighing the components according to the formula for later use;

2) banburying: putting the mixture into an internal mixer for internal mixing until the mixture is agglomerated, and discharging the mixture, wherein the temperature is controlled to be 120-150 ℃;

3) cutting: cutting the material obtained by banburying in the step 2) into small blocks of 25-35 cm (25-35) cm, and cooling the small blocks to room temperature;

4) open mixing: the material cut and cooled in the step 3) is milled on a mill, the temperature is controlled to be 90-100 ℃, cloth is drawn, the material is formed into a thin cloth shape of (25-35) cm x (25-35) cm, and the material is cooled for standby;

5) crushing: crushing the thin cloth-shaped material obtained in the step 4) to 1cm by using a crusher.

Background

The color master batch is a plastic colorant which is prepared by well dispersing a pigment or an additive and a thermoplastic resin in a high proportion, and the selected resin has good wetting and dispersing effects on the colorant and has good compatibility with a material to be colored. Namely: pigment, carrier and additive are color master batch.

Chinese published patent literature (CN 106977807A) discloses a nano EVA color master batch, which is prepared from the following raw materials in parts by weight: the coating comprises, by weight, 60-65 parts of EVA, 15-25 parts of PE, 8-23 parts of nano molybdenum disulfide, 15-28 parts of polytetrafluoroethylene wax, 2-6 parts of potassium persulfate, 5-9 parts of nano titanium nitride, 3-7 parts of fatty alcohol-polyoxyethylene ether, 10-20 parts of nano kieselguhr, 4-8 parts of a pigment, 8-15 parts of nano perlite, 4-7 parts of 1, 4-butylene glycol, 8-23 parts of graphene, 15-28 parts of allyl acetoacetate and 45-60 parts of water. The technology adopts the synergistic effect of a plurality of components to overcome the problems of unstable color, large color difference and the like when the conventional EVA color master batch is colored.

Chinese published patent literature (CN 105199183A) discloses a color master batch formula which is characterized by comprising the following components in parts by weight: 20-80 parts of carrier, 5-30 parts of toner, 5-25 parts of dispersant, 1-8 parts of heat stabilizer, 1-8 parts of antibacterial agent, 1-8 parts of antioxidant and 1-5 parts of additive. The antibacterial agent, the antioxidant and the additive are added into the color master batch, so that the anti-aging performance of the color master batch can be further enhanced, the antibacterial performance of the color master batch is improved, and the antibacterial and bacteriostatic effects are achieved.

Therefore, how to uniformly disperse the pigment in the resin carrier and the antibacterial effect are important indexes in the research and development of the color master batch. However, as for the antibacterial agent, a porous carrier or a nano-sized powder having a large specific surface area is generally selected, and then an antibacterial component such as silver is supported on the carrier and added to a plastic substrate. The antibacterial agent has a big problem in the application of adding and modifying plastics or rubber and the like: how to disperse the antimicrobial agent in the plastic matrix to avoid creating local high concentrations.

Disclosure of Invention

The invention aims to provide an antibacterial color master batch and a preparation method thereof, wherein antibacterial ingredients and pigments are uniformly dispersed, and the antibacterial color master batch has good antibacterial property.

In order to achieve the purpose, the invention adopts the technical scheme that:

the antibacterial color master batch comprises the following components in parts by weight: 20-30 parts of pigment, 8-12 parts of dispersing agent, 30-40 parts of low-melt-strength EVA colloidal particles, 10-15 parts of nano zinc oxide-low molecular weight polypropylene compound and 5-8 parts of silver-containing antibacterial agent.

Preferably, the pigment is one of carbon black, titanium dioxide, iron oxide yellow and molybdenum chrome red.

Preferably, the dispersant is polyethylene wax, ethylene bisstearamide or pentaerythritol stearate.

Preferably, the environment-friendly color master batch further comprises 2-5 parts of a heat stabilizer, wherein the heat stabilizer is epoxy glyceride, epoxy fatty ester, calcium stearate or zinc stearate.

Preferably, the environment-friendly color master batch further comprises 0.5-1 part of antioxidant, wherein the antioxidant is one or more of 3114, 1010 and DSTP.

Preferably, the low melt strength EVA crumb rubber is one or more of tai po 7350, tai po 7470 and tai po 3312.

Preferably, the preparation method of the nano zinc oxide-low molecular weight polypropylene composite comprises the following steps: using zinc acetate as a precursor and dissolving the zinc acetate in 2.5% glacial acetic acid water solution to prepare a zinc acetate solution with the mass concentration of 10%; mixing low molecular weight polypropylene and high boiling point oil solution in a reactor, heating and melting, dropwise adding zinc acetate solution under continuous high-speed stirring, wherein the reaction temperature is 200-250 ℃, and the dropwise adding amount is 0.1-0.2 g of zinc acetate solution per gram of low molecular weight polypropylene, so as to obtain the nano zinc oxide-low molecular weight polypropylene compound.

Preferably, the molecular weight of the low molecular weight polypropylene in the nano zinc oxide-low molecular weight polypropylene composite is 4000-5000.

Preferably, the silver-containing antibacterial agent is prepared by the following steps: dispersing 100 parts by weight of 300-500-mesh marble powder in distilled water, adding 3-5 parts by weight of 10% silver nitrate solution by mass percentage, uniformly stirring, and dropwise adding 3-5 parts by weight of 10% sodium borohydride solution by mass percentage until the mixed solution is green; standing, filtering the mixed solution, washing, and drying at 200-300 ℃ to obtain the powdery silver-containing antibacterial agent.

The invention also provides a preparation method of the antibacterial color master batch, which comprises the following specific steps:

1) preparing materials: weighing the components according to the formula for later use;

2) banburying: putting the mixture into an internal mixer for internal mixing until the mixture is agglomerated, and discharging the mixture, wherein the temperature is controlled to be 120-150 ℃;

3) cutting: cutting the material obtained by banburying in the step 2) into small blocks of 25-35 cm (25-35) cm, and cooling the small blocks to room temperature;

4) open mixing: the material cut and cooled in the step 3) is milled on a mill, the temperature is controlled to be 90-100 ℃, cloth is drawn, the material is formed into a thin cloth shape of (25-35) cm x (25-35) cm, and the material is cooled for standby;

5) crushing: crushing the thin cloth-shaped material obtained in the step 4) to 1cm by using a crusher.

Compared with the prior art, the invention has the following beneficial effects:

the invention uses low melt strength EVA colloidal particles in the formula, which can reduce the cohesion among carrier molecules, enhance the dispersing ability and processing rheological property of pigment, silver-containing antibacterial agent and nano zinc oxide-low molecular weight polypropylene compound, and the first antibacterial component silver is loaded in marble powder filler, can realize uniform dispersion in the carrier under the combined action of dispersing agent, nano zinc oxide-low molecular weight polypropylene compound and low melt strength EVA colloidal particles, the second nano zinc oxide-low molecular weight polypropylene compound can well disperse nano zinc oxide in low molecular weight polypropylene in the preparation process, can not generate agglomeration, can endow color master with good antibacterial property, ultraviolet resistance and enhanced color master tensile tearing property through nano zinc oxide, and can be compatible with low melt strength EVA colloidal particles along with the flow of low melt strength, thereby showing a remarkable antibacterial effect and antibacterial uniformity. Likewise, the pigment may be uniformly dispersed in the carrier, and the colored article may be free of specks and streaks.

Detailed Description

Example 1

The embodiment provides an antibacterial color master batch, which comprises the following components in parts by weight: 25 parts of titanium dioxide, 10 parts of polyethylene wax, 40 parts of low-melt-strength EVA colloidal particles, 12 parts of a nano zinc oxide-low-molecular-weight polypropylene compound and 8 parts of a silver-containing antibacterial agent, wherein the low-melt-strength EVA colloidal particles are tai-poly 7350.

Example 2

The embodiment provides an antibacterial color master batch, which comprises the following components in parts by weight: 20 parts of carbon black, 8 parts of ethylene bisstearamide, 30 parts of low-melt-strength EVA colloidal particles, 10 parts of a nano zinc oxide-low-molecular-weight polypropylene composite, 5 parts of a silver-containing antibacterial agent, 2 parts of zinc stearate and 0.5 part of an antioxidant 3114, wherein the low-melt-strength EVA colloidal particles are Taiji 7470.

Example 3

The embodiment provides an antibacterial color master batch, which comprises the following components in parts by weight: 25 parts of molybdenum chrome red, 6 parts of polyethylene wax, 4 parts of ethylene distearamide, 35 parts of low-melt-strength EVA colloidal particles, 15 parts of nano zinc oxide-low-molecular-weight polypropylene compound, 6 parts of silver-containing antibacterial agent, 3 parts of calcium stearate, 0.3 part of antioxidant 1010 and 0.5 part of antioxidant DSTP, wherein the low-melt-strength EVA colloidal particles are Taiji 3312.

Example 4

The embodiment provides an antibacterial color master batch, which comprises the following components in parts by weight: 20 parts of iron oxide yellow, 8 parts of polyethylene wax, 4 parts of pentaerythritol stearate, 20 parts of poly 7350, 15 parts of poly 7470, 10 parts of nano zinc oxide-low molecular weight polypropylene compound, 6 parts of silver-containing antibacterial agent, 0.8 part of antioxidant 1010 and 0.2 part of antioxidant DSTP.

Example 5

The embodiment provides an antibacterial color master batch, which comprises the following components in parts by weight: 30 parts of titanium dioxide, 12 parts of polyethylene wax, 15 parts of poly 7350, 20 parts of poly 3312, 12 parts of nano zinc oxide-low molecular weight polypropylene compound, 5 parts of silver-containing antibacterial agent, 2 parts of epoxy glyceride and 3 parts of zinc stearate.

The preparation methods of the nano zinc oxide-low molecular weight polypropylene composite of the above examples 1 to 5 are all as follows: using zinc acetate as a precursor and dissolving the zinc acetate in 2.5% glacial acetic acid water solution to prepare a zinc acetate solution with the mass concentration of 10%; mixing low molecular weight polypropylene and high boiling point oil solution in a reactor, heating and melting, dropwise adding zinc acetate solution under continuous high-speed stirring, wherein the reaction temperature is 200-250 ℃, and the dropwise adding amount is 0.1-0.2 g of zinc acetate solution per gram of low molecular weight polypropylene, so as to obtain the nano zinc oxide-low molecular weight polypropylene compound. The molecular weight of the low molecular weight polypropylene in the nano zinc oxide-low molecular weight polypropylene compound is 4000-5000.

The silver-containing antibacterial agents of examples 1 to 5 above were prepared by the following methods: dispersing 100 parts by weight of 300-500-mesh marble powder in distilled water, adding 3-5 parts by weight of 10% silver nitrate solution by mass percentage, uniformly stirring, and dropwise adding 3-5 parts by weight of 10% sodium borohydride solution by mass percentage until the mixed solution is green; standing, filtering the mixed solution, washing, and drying at 200-300 ℃ to obtain the powdery silver-containing antibacterial agent.

The preparation method of the antibacterial color master batch of the above embodiments 1 to 5 comprises the following specific steps: 1) preparing materials: weighing the components according to the formula for later use; 2) banburying: putting the mixture into an internal mixer for internal mixing until the mixture is agglomerated, and discharging the mixture, wherein the temperature is controlled to be 120-150 ℃; 3) cutting: cutting the material obtained by banburying in the step 2) into small blocks of 25-35 cm (25-35) cm, and cooling the small blocks to room temperature; 4) open mixing: the material cut and cooled in the step 3) is milled on a mill, the temperature is controlled to be 90-100 ℃, cloth is drawn, the material is formed into a thin cloth shape of (25-35) cm x (25-35) cm, and the material is cooled for standby; 5) crushing: crushing the thin cloth-shaped material obtained in the step 4) to 1cm by using a crusher.

While there have been shown and described what are at present considered the fundamental principles and essential features of the invention and its advantages, it will be understood by those skilled in the art that the invention is not limited by the embodiments described above, which are merely illustrative of the principles of the invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the invention as defined by the appended claims and their equivalents.