1. A soluble glass fiber blanket comprising the following components:

SiO₂ 40～63.5wt％、Al₂O₃ 12～20wt％、CaO18～25wt％、MgO 3～10wt％；

K₂o and Na₂The total content of O is 0.10-0.8 wt%;

ZnO≤1wt％，SO₃less than or equal to 1 wt%, and ZnO and SO₃The mass ratio of (A) to (B) is 0.5-1.0: 1;

and carbon element;

the SiO₂And Al₂O₃The ratio of the total mass content of CaO to the total mass content of MgO is 2.0-3.2;

the soluble glass fiber blanket comprises the following raw materials: quartz sand, dolomite, pyrophyllite, soda ash, potash feldspar and coal powder;

the mass ratio of the coal powder to the ZnO is 3.1-4: 1.

2. The soluble glass fiber blanket of claim 1, wherein said SiO₂And Al₂O₃The total content of (A) is 63-75 wt%;

said K₂O and Na₂The total content of O is 0.15-0.5 wt%;

the total content of CaO and MgO is 24-32 wt%.

3. The soluble glass fiber blanket of claim 1, wherein the molar ratio of O to Si in the soluble glass fiber blanket is 2.5-3.0.

4. The soluble glass fiber blanket of claim 1 wherein said soluble glass fiber blanket comprises SiO₂55～62wt％、Al₂O₃ 13～16wt％、CaO19～23wt％、MgO 3～6wt％；

K₂O and Na₂The total content of O is 0.15-0.5 wt%;

ZnO0.2～0.5wt％、SO₃≤0.6wt％。

5. the soluble glass fiber blanket of claim 1, wherein the soluble glass fiber blanket has a bulk density of 20-96 kg/m³The tensile strength is 30 to 60Kpa, and the average heat conductivity coefficient at 70 ℃ is 0.039 to 0.044W/m.k.

6. A method for preparing a soluble glass fiber blanket as claimed in any one of claims 1 to 5, comprising the steps of:

mixing quartz sand, dolomite, pyrophyllite, soda ash, potash feldspar and coal powder, melting, forming fiber by spinning or blowing to form fiber aggregate, and needling to obtain the soluble glass fiber blanket.

7. The soluble glass fiber blanket according to claim 1, wherein the pulverized coal has a particle size of 20-40 μm.

8. The method according to claim 1, wherein the fiber diameter of the fiber aggregate is 4 to 6 μm.

9. The method according to claim 1, wherein the melting temperature is 1500 to 1800 ℃.

Background

The soluble fiber is fiber with low biological persistence, and can be dissolved in physiological fluid after entering human body, so that the fiber has short retention time in human body, and can be gradually decomposed by human body fluid and discharged out of human body. The soluble fibers can be further processed as a major or minor component into a variety of articles including boards, mats, papers, blankets/felts, cotton/wool, shaped/formed articles, coating materials, and amorphous compositions, among others.

The existing soluble fiber comprises soluble ceramic fiber, soluble glass fiber, soluble basalt fiber and the like. Wherein, the main components of the soluble glass fiber comprise: SiO 2₂ 40～65wt％；Al₂O₃ 10～20wt％；CaO 15～30wt％；MgO 3～10wt％；K₂O+Na₂0-10 wt% of O. The prior soluble glass fiber has K₂O、Na₂The high content of O leads to large fiber diameter (more than 6 μm, even 10-20 μm), small fiber flexural strength, and incapability of needling, thus being incapable of preparing fiber blanket products by needling. In addition, when other fiber products (non-carpet products such as felt, board and cotton blank) are manufactured, organic matters are required to be added to soften the fiber products and enhance the strength of the fiber products, but the organic matters are easy to volatilize in the subsequent use process to generate peculiar smell and harmful substances, or are inflammable to further generate potential safety hazards.

Disclosure of Invention

In view of the above, the present invention is directed to a soluble glass fiber blanket and a method for preparing the same, wherein the soluble glass fiber blanket has a high tensile strength.

The invention provides a soluble glass fiber blanket which comprises the following components in parts by mass:

SiO₂ 40～63.5wt％、Al₂O₃ 12～20wt％、CaO18～25wt％、MgO 3～10wt％；

K₂o and Na₂The total content of O is 0.10-0.8 wt%;

ZnO≤1wt％，SO₃less than or equal to 1 wt%, and ZnO/SO₃The mass ratio of (A) to (B) is 0.5-1.0;

and carbon element;

the SiO₂And Al₂O₃The ratio of the total mass content of CaO to the total mass content of MgO is 2.0-3.2;

the soluble glass fiber blanket comprises the following raw materials: quartz sand, dolomite, pyrophyllite, soda ash, potash feldspar and coal powder;

the mass ratio of the coal powder to the ZnO is 3.1-4: 1.

Preferably, the SiO₂And Al₂O₃The total content of (A) is 63-75 wt%;

said K₂O and Na₂The total content of O is 0.15-0.5 wt%;

the total content of CaO and MgO is 24-32 wt%.

Preferably, the mol ratio of O to Si in the soluble glass fiber blanket is 2.5-3.0.

Preferably, the soluble glass fiber blanket comprises SiO₂ 55～62wt％、Al₂O₃ 13～16wt％、CaO19～23wt％、MgO 3～6wt％；

K₂O and Na₂The total content of O is 0.15-0.5 wt%;

ZnO0.2～0.5wt％、SO₃≤0.6wt％。

preferably, the volume weight of the soluble glass fiber blanket is 20-96 kg/m³The tensile strength is 30 to 60Kpa, and the average heat conductivity coefficient at 70 ℃ is 0.039 to 0.044W/m.k.

The invention provides a preparation method of the soluble glass fiber blanket in the technical scheme, which comprises the following steps:

mixing quartz sand, dolomite, pyrophyllite, soda ash, potash feldspar and coal powder, melting, forming fiber by spinning or blowing to form fiber aggregate, and needling to obtain the soluble glass fiber blanket.

Preferably, the granularity of the pulverized coal is 20-40 μm.

Preferably, the fiber diameter in the fiber aggregate is 4-6 μm.

Preferably, the melting temperature is 1500-1800 ℃.

The invention provides a soluble glass fiber blanket, which comprises the following components: SiO 2₂ 40～63.5wt％、Al₂O₃ 12～20wt％、CaO18～25wt％、MgO 3～10wt％；K₂O and Na₂Total content of O0.10 to 0.8 wt%; ZnO is less than or equal to 1 wt%, SO₃Less than or equal to 1 wt%, and ZnO/SO₃The content ratio of (A) to (B) is 0.5 to 1.0; carbon element; the SiO₂And Al₂O₃The ratio of the total mass content of CaO to the total mass content of MgO is 2.0-3.2; the soluble glass fiber blanket comprises the following raw materials: quartz sand, dolomite, pyrophyllite, soda ash, potash feldspar and coal powder; the mass ratio of the coal powder to the ZnO is 3.1-4: 1. The carbon and the S element can act together with ZnO to increase the flexural strength and flexibility of the fiber, so that the fiber is suitable for being prepared into a blanket through needle punching. The fiber blanket does not need to be added with organic substances, and the prepared fiber blanket has lower heat conductivity coefficient. The experimental results show that: the volume weight of the soluble glass fiber blanket is 20-96 kg/m³The tensile strength is 30 to 60Kpa, and the average heat conductivity coefficient at 70 ℃ is 0.039 to 0.044W/m.k.

Detailed Description

The invention provides a soluble glass fiber blanket which comprises the following components in parts by mass:

SiO₂ 40～63.5wt％、Al₂O₃ 12～20wt％、CaO18～25wt％、MgO 3～10wt％；

K₂o and Na₂The total content of O is 0.10-0.8 wt%;

ZnO≤1wt％，SO₃less than or equal to 1 wt%, and ZnO/SO₃The mass content ratio of (A) is 0.5-1.0: 1;

and carbon element;

the SiO₂And Al₂O₃The ratio of the total mass content of CaO to the total mass content of MgO is 2.0-3.2;

the soluble glass fiber blanket comprises the following raw materials: quartz sand, dolomite, pyrophyllite, soda ash, potash feldspar and coal powder;

the mass ratio of the coal powder to the ZnO is 3.1-4: 1.

The C and S elements in the soluble glass fiber blanket can act together with ZnO to increase the flexural strength and flexibility of the fiber, thereby making the soluble glass fiber blanket suitable for being prepared into a blanket through needle punching. The fiber blanket does not need to be added with organic substances, and the prepared fiber blanket has lower heat conductivity coefficient.

In the present invention, the soluble glass fiber blanket contains SiO₂ 40～63.5wt％、Al₂O₃ 12～20wt％，SiO₂And Al₂O₃The total content of (A) is preferably 63-75 wt%;

in the present invention, K in the soluble glass fiber blanket₂0 to 0.6 wt% of O and Na₂The mass content of O is 0-0.3 wt%, and K is₂O and Na₂The total content of O is 0.10-0.8 wt%, preferably 0.15-0.5 wt%;

in the invention, CaO 18-25 wt% and MgO 3-10 wt% are contained in the soluble glass fiber blanket; the total content of CaO and MgO is preferably 24-32 wt%, and more preferably 25-28 wt%. The invention regulates and controls SiO₂、Al₂O₃CaO, MgO and K₂O+Na₂The component proportion of O is used for increasing the service temperature of the fiber to 500 ℃.

In the invention, ZnO is less than or equal to 1 wt%, preferably 0.1-0.6 wt%, and more preferably 0.2-0.5 wt%;

the SO₃Less than or equal to 1 wt%, preferably 0.2 to 0.8 wt%, more preferably 0.4 to 0.6 wt%;

the ZnO and SO₃The mass ratio of (A) to (B) is 0.5-1.0: 1.

The soluble glass fiber blanket comprises carbon, the carbon is substituted by coal powder, and the mass ratio of the coal powder to ZnO is 3.1-4: 1, preferably 3.2-3.6: 1.

In the present invention, the soluble glass fiber blanket comprises the following raw materials: quartz sand, dolomite, pyrophyllite, soda ash, potash feldspar and coal powder; the coal powder accounts for 1-2% of the total mass content of other raw materials.

Different O/Si molar ratios represent different configurations of the silica network, are marks for measuring the degree of network fracture and are main parameters for fiber forming; the SiO₂And Al₂O₃The magnitude of the ratio of the total mass content of CaO to the total mass content of MgO influences the molar ratio O/Si; the SiO₂And Al₂O₃Total mass ofThe ratio of the content to the total mass content of CaO and MgO is 2.0-3.2, preferably 2.5-3.1; the molar ratio of O to Si is preferably 2.5 to 3.0, and more preferably 2.8 to 2.9.

In the present invention, the soluble glass fiber blanket preferably comprises SiO₂ 55～62wt％、Al₂O₃ 13～16wt％、CaO19～23wt％、MgO 3～6wt％；K₂O and Na₂The total content of O is 0.15-0.5 wt%.

In the invention, the volume weight of the soluble glass fiber blanket is 20-96 kg/m³The tensile strength is 30 to 60Kpa, and the average heat conductivity coefficient at 70 ℃ is 0.039 to 0.044W/m.k.

The invention provides a preparation method of the soluble glass fiber blanket in the technical scheme, which comprises the following steps:

mixing quartz sand, dolomite, pyrophyllite, soda ash, potash feldspar and coal powder, melting, forming fiber by spinning or blowing to form fiber aggregate, and needling to obtain the soluble glass fiber blanket.

In the invention, the granularity of the coal powder is 20-40 μm. The coal powder accounts for 1-2 wt% of the total mass of other raw materials. The coal powder serving as a combustion improver can reduce the melting temperature and ensure that the melted melt has better fiber forming performance; the C and S elements remained after the coal dust is burnt and the ZnO act together to increase the flexural strength and flexibility of the fiber, so that the fiber is suitable for preparing a blanket through needle punching.

In the present invention, the melting temperature is preferably 1500 to 1800 ℃. The apparatus used for melting and fiberizing is preferably the apparatus disclosed in patents ZL201921802736.5 and ZL 201920795574.0.

According to the invention, by adjusting the raw material components and the process parameters, the diameter of the soluble glass fiber is reduced, the flexural strength is enhanced, and no organic substance is added, so that the thermal conductivity of the prepared fiber blanket is low. In the present invention, the diameter of the fibers in the fiber aggregate is preferably 4 to 6 μm.

In the invention, the volume weight of the soluble glass fiber blanket is 20-96 kg/m³The tensile strength is 30-60 Kpa, and the average heat conductivity coefficient is 70 DEG C0.039-0.044W/m.k. The biological solubility of the soluble glass fiber blanket is 220-240 mg/L.

The invention adopts GB/T17911-2018 refractory fiber product experiment method to test the tensile strength and the volume weight performance of the soluble glass fiber blanket. GB/T10295-2008 ' determination of steady-state thermal resistance of heat-insulating material and related characteristics ' heat flow meter method ' tests the performance of the heat conductivity coefficient of the soluble glass fiber blanket. GB/T3003-2017 'fire-resistant fiber and products' tests the performance of biological solubility; the average diameter of the soluble fiber product is tested by a method of GB/T5480-2017 mineral wool and product experimental method thereof.

In order to further illustrate the present invention, the following examples are provided to describe a soluble glass fiber blanket and a method for preparing the same in detail, but they should not be construed as limiting the scope of the present invention.

Examples 1 to 10 and comparative examples 1 to 21

Mixing quartz sand, dolomite, pyrophyllite, soda ash, potash feldspar and coal powder, melting, forming fiber by adopting throwing, and preparing a fiber aggregate, and needling to obtain the soluble glass fiber blanket.

TABLE 1 composition of ingredients (unit, wt%) of fiber carpets prepared in examples and comparative examples

TABLE 2 elements C and S and O/Si ratios in examples and comparative examples

Table 3 results of performance testing of soluble glass fiber blankets prepared in examples and comparative examples

From the above examples, the present invention provides a soluble glass fiber blanket comprising the following components: SiO 2₂ 40～63.5wt％、Al₂O₃ 12～20wt％、CaO18～25wt％、MgO 3～10wt％；K₂O and Na₂The total content of O is 0.10-0.8 wt%; ZnO is less than or equal to 1 wt%, SO₃Less than or equal to 1 wt%, and ZnO/SO₃The content ratio of (A) to (B) is 0.5 to 1.0; and carbon element; the SiO₂And Al₂O₃The ratio of the total mass content of CaO to the total mass content of MgO is 2.0-3.2; the soluble glass fiber blanket comprises the following raw materials: quartz sand, dolomite, pyrophyllite, soda ash, potash feldspar and coal powder; the mass ratio of the coal powder to the ZnO is 3.1-4: 1. The carbon element and the S element can act together with ZnO to increase the flexural strength and flexibility of the fiber, so that the fiber is suitable for preparing a blanket through needle punching. The fiber blanket does not need to be added with organic substances, and the prepared fiber blanket has lower heat conductivity coefficient. The experimental results show that: the volume weight of the soluble glass fiber blanket is 20-96 kg/m³The tensile strength is 30 to 60Kpa, and the average heat conductivity coefficient at 70 ℃ is 0.039 to 0.044W/m.k.

The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.