Slurry for electronic-grade glass fiber superfine yarn and preparation method

Abstract

The invention relates to the technical field of electronic-grade glass fibers, in particular to a sizing agent for electronic-grade glass fiber superfine yarns and a preparation method of the sizing agent. Comprising the following raw materials in percentage by mass: 8-15% of polyvinyl alcohol, 2-6% of polyvinyl ester, 4-10% of polyethylene glycol, 3-9% of a lubricant, 3-7% of urea, 10-15% of modified starch and the balance of pure water. According to the sizing agent provided by the invention, a novel environment-friendly sizing agent formula is researched and developed according to the characteristics of superfine electronic-grade glass fiber yarns, so that warp yarns have softness, surface smoothness, antistatic property and saturability among single fibers, toughness and bundling property are improved, hairiness and broken silk are reduced, and warp-wise strength and wear resistance are enhanced; meanwhile, the harmful influence on the environment is also reduced.

Description

Technical Field

[0001] The invention relates to the technical field of electronic-grade glass fibers, and in particular to a slurry for electronic-grade glass fiber ultrafine yarn and a preparation method thereof. Background Art

[0002] With the continuous improvement of environmental awareness, the rapid development of the electronic-grade glass fiber cloth industry, the strengthening of competitiveness, the continuous improvement of customer requirements, and the thinner and thinner glass fiber cloth, the development of environmentally friendly ultra-fine electronic-grade glass fiber cloth slurry is a promising development direction. Glass fiber itself is brittle and easy to break during processing and use. The binder and other ingredients in the electronic-grade glass fiber cloth slurry can effectively penetrate between the glass fibers and effectively bond the fibers together, thereby significantly improving the tensile strength, flexural strength and wear resistance of the glass fiber cloth, and reducing the problems of broken wires, hairiness, etc. caused by friction damage between yarns during high-speed weaving. Slurry is the basis of sizing. Environmentally friendly slurry is a solvent-free, low VOC (volatile organic compound) emission slurry, or the slurry is prepared using renewable resources to reduce the impact on the environment.

[0003] At present, the diameter of the glass fiber monofilament of ultra-fine yarn is 4 μm. The thin monofilament diameter determines the high difficulty of production, low production efficiency, and difficulty in large-scale production. The slurry traditionally used for glass monofilament is not conducive to the production and preparation of ultra-fine electronic yarn. The softness, smoothness, antistatic property and saturation between single fibers of the prepared ultra-fine electronic yarn are all poor. Therefore, the present invention is proposed. Summary of the invention

[0004] The first object of the present invention is to provide a slurry for electronic-grade glass fiber superfine yarn, which is developed according to the characteristics of electronic-grade glass fiber superfine yarn, so that the warp yarn has softness, surface smoothness, antistatic property and saturation between single fibers, increases toughness and bundling, reduces hairiness and broken yarns, enhances warp strength and wear resistance, and reduces harmful effects on the environment. The second object of the present invention is to provide a method for preparing a slurry for electronic-grade glass fiber superfine yarn.

[0005] The invention provides a slurry for electronic-grade glass fiber superfine yarn, comprising the following raw materials in percentage by mass: 8-15% polyvinyl alcohol, 2-6% polyethylene grease, 4-10% polyethylene glycol, 3-9% lubricant, 3-7% urea, 10-15% modified starch, and the rest being pure water.

[0006] Preferably, the concentration of the slurry is 12.5-17.5%.

[0007] Preferably, the volatile content of the polyvinyl alcohol is 5-8%.

[0008] Preferably, the viscosity of the polyvinyl alcohol is 3-9 mPa·s.

[0009] Preferably, the lubricant is dimethyl silicone oil. Dimethyl silicone oil can reduce the surface tension of the slurry, so that the slurry can be better leveled during the coating process, and prevent the appearance of orange peel or brush marks. In the slurry formula, silicone oil can effectively improve the performance of the slurry, making the coating on the yarn surface smoother. In addition, silicone oil also has a certain defoaming function, which can reduce the generation of bubbles during the slurry stirring process, because it can reduce the surface tension of the liquid, making it difficult for bubbles to form or causing the bubbles that have been formed to burst.

[0010] Preferably, the modified starch is prepared by the following method:

[0011] (1) First, starch and water are mixed to prepare a starch emulsion;

[0012] (2) adding sodium hydroxide solution to the starch emulsion to adjust the pH to 10-12;

[0013] (3) Then, a monochloroacetic acid solution is added dropwise, and the mixture is reacted at a temperature of 70-75° C. for 6-6.5 hours to obtain the modified starch.

[0014] The preparation process of modified starch is mainly to make the hydroxyl groups of starch react with etherifying agents to form ether bonds. Etherified starch has good water solubility and thickening properties and is widely used in the textile industry.

[0015] Preferably, the monofilament diameter of the electronic grade glass fiber ultrafine yarn is 4 μm.

[0016] The present invention provides a method for preparing a slurry for electronic-grade glass fiber superfine yarn, comprising the following steps:

[0017] S1. Add pure water to the mixing barrel and stir;

[0018] S2. Add polyvinyl alcohol, urea and modified starch after stirring, stir, and heat until completely dissolved;

[0019] S3. Continue to add polyethylene grease, polyethylene glycol and lubricant, and keep them warm and stand until they are completely dissolved to obtain a slurry.

[0020] Preferably, the temperature in step S2 is raised to 120-140°C.

[0021] Preferably, the insulation time in step S3 is 6-8 hours.

[0022] The preparation principle of the above slurry formula is as follows:

[0023] Polyvinyl alcohol: It has unique strong adhesion, film flexibility, smoothness, oil resistance, solvent resistance, protective colloid, gas barrier, wear resistance and water resistance after special treatment. However, the single filament of ultra-fine glass fiber yarn is thin in diameter, not wear-resistant, and easy to break. In order to improve this situation, through many tests, a better sizing formula has been experimentally developed. The mass content of polyvinyl alcohol is 8-15%, the volatile content is 5-8%, and the viscosity is 3-9mpa.s. The use of polyvinyl alcohol with a higher volatile content can better coat the surface of the sizing yarn, better wrap the original yarn on the jet loom, avoid the yarn bundle from breaking and dispersing, and is also more conducive to decomposition and desizing in the post-processing stage.

[0024] Polyethylene grease can enhance the adhesion and flexibility of the slurry. Polyethylene glycol can increase the softness and antistatic properties of the yarn, effectively reduce friction and wear during processing, and is relatively stable at high temperatures. Lubricants help reduce friction between yarns and improve weaving efficiency. Urea can increase the toughness and bundling of the warp yarn on the basis of the original slurry, reduce hairy yarns, enhance the warp strength and wear resistance, and reduce powder falling during the loom process. Modified starch can increase the viscosity and stability of the slurry and help the bundling of the yarn. Pure water as a solvent can make electronic-grade glass fiber cloth have the effects of high mechanical strength, low wear, broken yarns, and low hairiness.

[0025] In summary, the present invention has the following advantages:

[0026] The slurry for electronic-grade glass fiber yarn provided by the present invention is a new environmentally friendly slurry formula developed based on the characteristics of glass fiber yarn, which makes the warp yarn soft, has surface smoothness, antistatic properties and saturation between single fibers, increases toughness and bundling, reduces hairiness and broken fibers, enhances warp strength and wear resistance, and reduces harmful effects on the environment. DETAILED DESCRIPTION

[0027] It should be noted that the following detailed descriptions are illustrative and are intended to provide further explanation of the present application. Unless otherwise specified, all technical and scientific terms used herein have the same meanings as those commonly understood by those skilled in the art to which the present application belongs.

[0028] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form also includes the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this description, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0029] The technical solution of the present invention will be clearly and completely described below in conjunction with the embodiments. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0030] Example 1

[0031] A slurry for electronic grade glass fiber ultrafine yarn is composed of the following raw materials in mass percentage: 14% polyvinyl alcohol, 5% polyethylene grease, 8% polyethylene glycol, 6% dimethyl silicone oil, 6% urea, 13% modified starch, and the rest is pure water, and the concentration of the slurry is 14.5%. The volatile content of the polyvinyl alcohol used is 7%, and the viscosity is 9mPa·s.

[0032] The modified starch used is prepared by the following method:

[0033] (1) First, starch and water are mixed to prepare a starch emulsion with a concentration of 18%;

[0034] (2) adding a 3% sodium hydroxide solution to the starch emulsion to adjust the pH to about 10-12;

[0035] (3) Then, a 5% monochloroacetic acid solution was added dropwise and reacted at 70° C. for 6 hours to obtain modified starch.

[0036] The preparation method of the above slurry is as follows:

[0037] S1. Add pure water to the mixing barrel and stir;

[0038] S2. Add polyvinyl alcohol, urea and modified starch after thorough stirring, stir, and raise the temperature to 140°C after complete dissolution;

[0039] S3. Continue to add polyethylene grease, polyethylene glycol and dimethyl silicone oil, and keep them warm and stand for 8 hours after they are completely dissolved to obtain a slurry.

[0040] The method of using the above slurry is as follows:

[0041] The prepared slurry is transmitted to the slurry tank of the pulping machine through the return slurry pipeline, and then the slurry is evenly poured onto the glass fiber yarn through the transmission system of the slurry tank to wrap the glass fiber yarn, thereby increasing the toughness and bundling of the glass fiber yarn.

[0042] The polyvinyl alcohol, polyvinyl ester, polyethylene glycol, lubricant, urea and modified starch used in the present invention are all raw materials for preparing electronic yarn slurry in the art.

[0043] Example 2

[0044] A slurry for electronic-grade glass fiber ultrafine yarn is composed of the following raw materials in percentage by mass: 12% polyvinyl alcohol, 6% polyethylene grease, 10% polyethylene glycol, 8% dimethyl silicone oil, 4% urea, 10% modified starch, and the rest is pure water, and the concentration of the slurry is 15%. The volatile content of the polyvinyl alcohol used is 5.5%, and the viscosity is 5 mPa·s; the modified starch used is the same as that in Example 1.

[0045] The preparation method of the above slurry is as follows:

[0046] S1. Add pure water to the mixing barrel and stir;

[0047] S2. Add polyvinyl alcohol, urea and modified starch after thorough stirring, stir, and raise the temperature to 140°C after complete dissolution;

[0048] S3. Continue to add polyethylene grease, polyethylene glycol and dimethyl silicone oil, and keep them warm and stand for 8 hours after they are completely dissolved to obtain a slurry.

[0049] Example 3

[0050] A slurry for electronic-grade glass fiber ultrafine yarn is composed of the following raw materials in percentage by mass: 14% polyvinyl alcohol, 5% polyethylene grease, 8% polyethylene glycol, 6% dimethyl silicone oil, 6% urea, 13% modified starch, and the rest is pure water, and the concentration of the slurry is 14.5%. The volatile content of the polyvinyl alcohol used is 7%, and the viscosity is 9 mPa·s; the modified starch used is the same as that in Example 1.

[0051] The preparation method of the above slurry is as follows:

[0052] S1. Add pure water to the mixing barrel and stir;

[0053] S2. Add polyvinyl alcohol, urea and modified starch after thorough stirring, stir, and raise the temperature to 120°C after complete dissolution;

[0054] S3. Continue to add polyethylene grease, polyethylene glycol and dimethyl silicone oil, and keep them warm and stand for 6 hours after they are completely dissolved to obtain a slurry.

[0055] Comparative Example

[0056] A slurry for electronic grade glass fiber yarn is composed of the following raw materials in percentage by mass: 15% polyvinyl alcohol, 7% polyethylene resin, 14% polyethylene glycol, and the rest is pure water, and the concentration of the slurry is 14.5%. The preparation method of the slurry is consistent with that of Example 1.

[0057] The slurry prepared in Example 1 and the comparative example is transmitted to the slurry tank of the slurry machine through the slurry return pipeline, and the slurry is evenly poured onto the glass fiber yarn through the transmission system of the slurry tank to form a wrap around the glass fiber yarn, and then dried in an oven to increase the toughness and bundling of the glass fiber yarn; the warp yarn and the weft yarn are then interwoven with each other on a loom to weave into cloth; the volatile components in the slurry are then removed by heat treatment to make the fiber more stable; and a coating treatment is performed to meet specific application requirements. In the loom section, on-machine inspection personnel are arranged to inspect the cloth surface. After the entire process section is completed, the quality inspection department arranges the finished product inspection, so the on-machine and finished product inspection data are obtained.

[0058] The warp quality analysis of the obtained electronic grade glass fiber cloth is now carried out, as shown in Table 1 and Table 2.

[0059] Table 1 Comparative analysis of the warp quality of the slurry in Example 1

[0060]

[0061] Table 2 Comparative analysis of the warp quality of the pulp using the comparative example

[0062]

[0063] Note: The on-machine deduction point is the inspection deduction point for semi-finished products in the production process, and the inspection deduction point is the inspection deduction point for finished products.

[0064] It can be clearly seen from Tables 1 and 2 that the slurry provided by the present invention can significantly reduce warp anomalies of the ultrafine glass fiber cloth, such as warp breakage, yarn bonding, etc.; at the same time, it can better maintain the integrity of the ultrafine glass fiber cloth and reduce fiber breakage and cloth surface damage.

[0065] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A slurry for electronic grade glass fiber superfine yarn, characterized in that: The invention comprises the following raw materials in percentage by mass: 8-15% of polyvinyl alcohol, 2-6% of polyethylene grease, 4-10% of polyethylene glycol, 3-9% of lubricant, 3-7% of urea, 10-15% of modified starch, and the rest is pure water.

2. The slurry according to claim 1, characterized in that The concentration of the slurry is 12.5%-17.5%.

3. The slurry according to claim 1, characterized in that The volatile content of the polyvinyl alcohol is 5-8%.

4. The slurry according to claim 1, characterized in that The viscosity of the polyvinyl alcohol is 3-9 mPa·s.

5. The slurry according to claim 1, characterized in that The lubricant is dimethyl silicone oil.

6. The slurry according to claim 1, characterized in that The modified starch is prepared by the following method: (1) First, starch and water are mixed to prepare a starch emulsion; (2) adding sodium hydroxide solution to the starch emulsion to adjust the pH to 10-12; (3) Then, a monochloroacetic acid solution is added dropwise, and the mixture is reacted at a temperature of 70-75° C. for 6-6.5 hours to obtain the modified starch.

7. The slurry according to claim 1, characterized in that The monofilament diameter of electronic grade glass fiber ultrafine yarn is 4μm.

8. A method for preparing the slurry according to any one of claims 1 to 6, characterized in that: The following steps are involved: S1. Add pure water to the mixing barrel and stir; S2. Add polyvinyl alcohol, urea and modified starch after stirring, stir, and heat until completely dissolved; S3. Continue to add polyethylene grease, polyethylene glycol and lubricant, and keep them warm and stand until they are completely dissolved to obtain a slurry.

9. The preparation method according to claim 8, characterized in that: In step S2, the temperature is raised to 120-140°C.

10. The preparation method according to claim 8, characterized in that: The insulation time in step S3 is 6-8 hours.

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