Starch size for sizing glass fiber yarn for weaving and preparation method of starch size

Abstract

The invention relates to the field of spinning, in particular to starch slurry for sizing glass fiber yarns for weaving and a preparation method of the starch slurry. The method comprises the following steps: refining starch; acidolysis of starch; the preparation method comprises the following steps: mixing starch milk, a silane coupling agent and a catalyst a for reaction under inert gas and water bath heating conditions to obtain modified starch A; the silane coupling agent is prepared from vinyl trimethoxy silane, vinyl triisopropoxy silane, a silane coupling agent KH-560 or gamma-aminopropyl triethoxy silane, and the silane coupling agent is prepared from vinyl trimethoxy silane, vinyl triisopropoxy silane, a silane coupling agent KH-560 or gamma-aminopropyl triethoxy silane; mixing and reacting starch milk, a functional monomer and a catalyst b under inert gas and water bath heating conditions to obtain modified starch B; the functional monomer comprises 3-chloro-2-hydroxypropyl trimethyl ammonium chloride, butyl acrylate, sodium allysulfonate, acrylic acid or methyl acrylate; gelatinizing the starch milk, adding a textile auxiliary agent, and uniformly mixing. The starch size is applied to sizing of glass fiber yarns for weaving, the sizing rate is high, and a product has high bundling property, high wear resistance, high elasticity, excellent mechanical property and excellent flexibility.

Description

Technical Field

[0001] The invention relates to the field of textiles, in particular to a starch sizing material for sizing glass fiber yarns for weaving and a preparation method thereof. Background Art

[0002] Glass fiber is obtained by drawing inorganic glass in amorphous state through a hole in a high-temperature molten state to fiberize it and then rapidly cooling it to room temperature with an impregnating agent. Compared with traditional fibers and ordinary chemical fibers, glass fiber has the characteristics of high temperature resistance, non-flammability, corrosion resistance, good heat insulation and sound insulation, and high tensile strength. However, the weaving of glass fiber yarn is more difficult due to its high rigidity, low cohesion, poor elasticity and low elongation. These characteristics lead to great defects in glass fiber yarn in terms of wear resistance, torsion resistance, bending and shearing properties related to weaving. At the same time, this also leads to an increase in the yarn breakage rate during the weaving process, affecting the weaving efficiency.

[0003] At present, the three main types of starch used in the industry for sizing glass fiber yarn are polyacrylates, PVA, and ester modified starch. PVA sizing is widely used in the field of textile sizing due to its excellent bundling performance and high toughness, but its disadvantages such as poor desizing and high pollution also limit its use. Starch is a renewable natural resource with abundant resources and a wide range of sources. It has good adhesion and biodegradability. It is a common film-forming agent and is easy to desize after sizing, which reduces desizing pollution and energy consumption. However, due to its high viscosity and low affinity with glass fiber, raw starch cannot be used directly for sizing glass fiber. Instead, it is used as sizing after modifying the raw starch.

[0004] There is no research report on starch sizing for sizing glass fiber warp yarn for weaving in the prior art.

[0005] CN101880964A reports an environmentally friendly green electronic-grade glass fiber cloth secondary slurry, which is used to size the glass fiber yarn after mixing modified starch with oily substances, water-based epoxy resin and polyethylene glycol methyl ether. The slurry has good coating properties for the glass fiber yarn, can reduce the generation of broken silk and hairiness of the glass fiber yarn during weaving, and the desizing and cleaning procedures are simple and environmentally friendly. However, the slurry is designed for electronic-grade glass fiber cloth used as a reinforcing material for circuit boards. The lower the requirement for the bundling of the yarn, the more conducive it is to increase the width of the warp yarn, avoid the infiltration of the glass fiber cloth in the CCL client resin and the resulting lack of glue in the glass fiber yarn bundle, and cause the circuit board to short-circuit. Therefore, the slurry disclosed in CN101880964A cannot meet the requirements of stronger bundling for sizing of weaving glass fiber yarn. The requirements for high bundling, high wear resistance, high elasticity and excellent softness of the weaving glass fiber warp yarn are higher than those of electronic-grade glass fiber cloth.

[0006] CN115536791A reports a method for preparing starch slurry with two diblock polymer chains connected to the same substituent. The prepared starch slurry with two diblock polymer chains connected to the same substituent has significantly more significant adhesion to polyester-cotton yarn and cotton yarn than starch slurry and acid-hydrolyzed starch prepared by conventional technology. The adhesion performance gradually increases with the increase of grafting rate, and is very suitable for sizing polyester-cotton and cotton yarn. However, as shown in Comparative Example 10 of the present application, the performance of the starch slurry applied to sizing of glass fiber yarn for weaving is not ideal. Summary of the invention

[0007] [Technical issues]

[0008] Provided are a sizing material for sizing glass fiber yarn for weaving with starch as the main film-forming agent and a preparation method thereof. The application of the sizing material in sizing glass fiber yarn for weaving achieves excellent sizing performance: the sizing rate is high and the processed product has high bundling, high wear resistance, high elasticity, excellent mechanical properties and excellent softness.

[0009] [Technical solution]

[0010] On the one hand, a method for preparing a starch slurry for sizing glass fiber yarn for weaving is provided, comprising the following steps:

[0011] (1) Starch refining: using methanol aqueous solution to purify starch to obtain refined starch;

[0012] (2) acid hydrolysis of starch: acid hydrolyzing the refined starch prepared in step (1) to obtain acid-hydrolyzed starch;

[0013] (3) Silane coupling agent modification: dispersing the acid-decomposed starch prepared in step (2) in water to prepare starch milk; mixing the starch milk, silane coupling agent and catalyst a under inert atmosphere and water bath heating conditions, filtering, washing, drying and grinding the resultant into powder to obtain modified starch A; wherein the silane coupling agent comprises at least one of vinyl trimethoxy silane, vinyl triisopropoxy silane, silane coupling agent KH-560 or γ-aminopropyl triethoxy silane; in the reaction system, the mass fraction of the acid-decomposed starch is 25-40%, and the mass fraction of the silane coupling agent is 0.5-2%;

[0014] (4) Functional monomer modification: the modified starch A prepared in step (3) is dispersed in water to prepare starch emulsion; the starch emulsion, the functional monomer and the catalyst b are mixed and reacted under an inert atmosphere and water bath heating conditions, and the resultant is filtered, washed, dried and ground into powder to obtain modified starch B; wherein the functional monomer comprises at least one of 3-chloro-2-hydroxypropyltrimethylammonium chloride, butyl acrylate, sodium allyl sulfonate, acrylic acid or methyl acrylate; in the reaction system, the mass fraction of the acid-hydrolyzed starch is 25-40%, and the mass fraction of the silane coupling agent is 0.5-2%;

[0015] (5) Slurry preparation: the modified starch B prepared in step (4) is dispersed in water to prepare a starch emulsion; gelatinization is performed, a textile auxiliary agent is added, and the mixture is mixed to obtain a starch slurry for sizing glass fiber yarn for weaving.

[0016] In some embodiments, the silane coupling agent is vinyltrimethoxysilane; and the functional monomer is 3-chloro-2-hydroxypropyltrimethylammonium chloride or acrylic acid.

[0017] In some embodiments, the silane coupling agent is silane coupling agent KH-560; the functional monomer is sodium allyl sulfonate or 3-chloro-2-hydroxypropyltrimethylammonium chloride.

[0018] In some embodiments, the silane coupling agent is vinyl triisopropoxy silane; and the functional monomer is butyl acrylate.

[0019] In some embodiments, the starch in step (1) comprises at least one of corn starch, tapioca starch, potato starch, sweet potato starch or wheat starch.

[0020] In some embodiments, step (1) specifically comprises starch refining: dispersing the starch evenly in a methanol-deionized water solution (the volume ratio of methanol to water is 15:85) to prepare a starch milk with a mass fraction of 30 to 60%; stirring at 50°C and filtering, washing, drying and grinding the obtained filter cake into powder to obtain refined starch.

[0021] In some embodiments, step (2) specifically comprises acid hydrolysis of starch: dispersing the refined starch prepared in step (1) in deionized water to prepare a starch milk with a mass fraction of 30 to 50%; stirring at 50° C., while adding 95 mL of a 0.5 to 2 mol / L dilute hydrochloric acid solution to the starch milk, reacting for 4 hours, neutralizing the starch milk with a sodium carbonate solution, and filtering, washing, drying, and grinding the starch milk into powder to obtain acid-hydrolyzed starch.

[0022] In some embodiments, the catalyst a comprises: sodium hydroxide or hydrogen peroxide and ammonium ferrous sulfate catalytic system; the reaction temperature in step (3) is 50-70° C., and the reaction time is 4-6 hours.

[0023] In some embodiments, the catalyst b comprises: sodium hydroxide; or, ascorbic acid, pentamethyldiethylenetriamine and copper bromide catalyst system; or, hydrogen peroxide and ammonium ferrous sulfate catalyst system; in step (4), the reaction temperature is 50-70° C., and the reaction time is 4-8 h.

[0024] In some embodiments, in step (5), the textile auxiliary agent includes acrylate; the mass ratio of acrylate to modified starch B is (5-25):100, and the mass fraction of modified starch B is 4%-6%.

[0025] On the other hand, a starch sizing material for sizing glass fiber yarn for weaving prepared by the aforementioned method is provided.

[0026] On the other hand, the invention provides use of the aforementioned starch sizing agent for sizing glass fiber yarn for weaving in starch sizing agent for sizing glass fiber yarn for weaving.

[0027] [Beneficial Effects]

[0028] (1) The present invention provides a sizing material for sizing glass fiber yarn for weaving with a specific modified starch as a main film-forming agent and a preparation method thereof. The application of the sizing material in sizing glass fiber yarn for weaving achieves excellent sizing performance: the sizing rate is high and the processed product has high bundling, high wear resistance, high elasticity, excellent mechanical properties and excellent softness;

[0029] (2) The method for preparing starch slurry for sizing glass fiber yarn for weaving of the present invention comprises the following steps in sequence: starch refining, starch acid hydrolysis, silane coupling agent modification, functional monomer modification and slurry preparation. The present invention has been found through research that starch is first modified by using a specific silane coupling agent including at least one of vinyl trimethoxy silane, vinyl triisopropoxy silane, silane coupling agent KH-560 or γ-aminopropyl triethoxy silane, and then the starch is modified by using a specific functional monomer including at least one of 3-chloro-2-hydroxypropyl trimethyl ammonium chloride, butyl acrylate, sodium allyl sulfonate, acrylic acid or methyl acrylate. The starch slurry prepared by the process of the present invention is used in sizing glass fiber yarn for weaving, and excellent sizing performance is achieved: the sizing rate is high (not less than 1.56%), and the processed product has high bundling, high wear resistance (friction fracture number is not less than 96 times), high elasticity, excellent mechanical properties (breaking strength is not less than 2365cN) and excellent softness (breaking elongation is between 3.98 and 4.32%).

[0030] (3) Based on the technical concept of the present invention, after a large number of screenings of different combinations of silane coupling agents and functional monomers, the study found that the combination of vinyl trimethoxysilane modification and 3-chloro-2-hydroxypropyl trimethyl ammonium chloride modification is most advantageous for achieving a high sizing rate and an excellent sizing performance in which the processed product has high bundling, high wear resistance, high elasticity, excellent mechanical properties and excellent softness. DETAILED DESCRIPTION

[0031] In the present invention, unless otherwise specified, all parts and percentages are by mass, and the equipment and raw materials used can be purchased from the market or are commonly used in the art. The methods in the following embodiments are all conventional methods in the art unless otherwise specified.

[0032] Example 1

[0033] A method for preparing starch slurry for sizing glass fiber yarn for weaving comprises the following steps:

[0034] (1) Starch refining: The starch was uniformly dispersed in a methanol-deionized water solution (the volume ratio of methanol to water was 15:85) to prepare a starch milk with a mass fraction of 40%; after mechanical stirring at 50° C. for 1 hour, the starch was filtered, and the obtained filter cake was washed, dried, and ground into powder to obtain refined starch;

[0035] (2) Starch acid hydrolysis: The refined starch prepared in step (1) is dispersed in deionized water to prepare a starch milk with a mass fraction of 40%; 95 mL of a 2 mol / L dilute hydrochloric acid solution is added dropwise to the starch milk under mechanical stirring at 50° C. After reacting for 4 hours, the starch milk is neutralized with a sodium carbonate solution, and the starch milk is filtered, washed, dried, and ground into powder to obtain acid-hydrolyzed starch;

[0036] (3) Silane coupling agent modification: The acid-hydrolyzed starch prepared in step (2) is dispersed in deionized water to prepare starch milk; the starch milk is placed in a four-necked flask, in a nitrogen atmosphere and a water bath at 50° C., vinyl trimethoxy silane is added, and the pH value of the system is adjusted to 11-12 with a 5% by mass sodium hydroxide solution to carry out a reaction, wherein the mass fraction of starch in the reaction system is 25%, and the mass fraction of vinyl trimethoxy silane is 0.5%. The reaction is completed after 4 hours, and the resultant is filtered, washed, dried, and ground into powder to obtain modified starch A;

[0037] (4) Functional monomer modification: the modified starch A prepared in step (3) is dispersed in deionized water to prepare a starch emulsion, the starch emulsion is placed in a four-necked flask, and 3-chloro-2-hydroxypropyltrimethylammonium chloride and sodium hydroxide are added to react in a nitrogen atmosphere and a water bath at 50° C., wherein the mass fraction of starch in the reaction system is 25%, the mass fraction of 3-chloro-2-hydroxypropyltrimethylammonium chloride is 0.5%, and the molar ratio of 3-chloro-2-hydroxypropyltrimethylammonium chloride to sodium hydroxide is 1:1; the reaction is completed after 6 hours, and the resultant is filtered, washed, dried, and ground into powder to obtain modified starch B;

[0038] (5) Preparation of slurry: The modified starch B prepared in step (4) is dispersed in deionized water to prepare a starch emulsion with a mass fraction of 6%. After gelatinization at 90° C. for 1 h, 20% of acrylate relative to the mass of starch is added, and after stirring evenly, a starch slurry for sizing glass fiber yarn for weaving is obtained.

[0039] Example 2

[0040] A method for preparing a starch slurry for sizing glass fiber yarn for weaving, referring to Example 1, except that:

[0041] The vinyltrimethoxysilane in step (3) is replaced by vinyltriisopropoxysilane;

[0042] The 3-chloro-2-hydroxypropyltrimethylammonium chloride in step (4) is replaced by butyl acrylate, and the sodium hydroxide (catalyst) is replaced by ascorbic acid, pentamethyldiethylenetriamine and cupric bromide, wherein the amount of ascorbic acid is 0.1% to 1% of the mass of the modified starch A, the amount of pentamethyldiethylenetriamine is 0.1% to 0.5% of the mass of the butyl acrylate monomer, and the amount of cupric bromide is 0.05% to 0.2% of the mass of the butyl acrylate monomer.

[0043] Example 3

[0044] A method for preparing a starch slurry for sizing glass fiber yarn for weaving, referring to Example 1, except that:

[0045] (3) Silane coupling agent modification: The acid-hydrolyzed starch prepared in step (2) is dispersed in deionized water to prepare starch emulsion; the starch emulsion is placed in a four-necked flask, in a nitrogen atmosphere and a water bath at 50° C., silane coupling agent KH-560 is added, and the pH value of the system is adjusted to 11-12 with a 5% by mass sodium hydroxide solution to carry out a reaction, wherein the mass fraction of starch in the reaction system is 25%, and the mass fraction of the silane coupling agent KH-560 is 1.5%. The reaction is completed after 4 hours, and the resultant is filtered, washed, dried, and ground into powder to obtain modified starch A;

[0046] (4) Functional monomer modification: The modified starch A prepared in step (3) is dispersed in deionized water to prepare a starch emulsion, and the starch emulsion is placed in a four-necked flask, and sodium allyl sulfonate, a 0.5% aqueous hydrogen peroxide solution by mass, and a 0.5% ammonium ferrous sulfate solution by mass are added in a nitrogen atmosphere and a water bath at 50° C., wherein the amount of the aqueous hydrogen peroxide solution is 0.5% to 2% of the mass of the sodium allyl sulfonate monomer and the amount of the ammonium ferrous sulfate solution is 0.1% to 0.5% of the mass of the sodium allyl sulfonate monomer. The pH value is adjusted to 3 to 5 with dilute hydrochloric acid, and the reaction is carried out, wherein the mass fraction of the modified starch A in the reaction system is 35%, and the mass fraction of the sodium allyl sulfonate is 1.5%. The reaction is completed after 6 hours, and the resultant is filtered, washed, dried, and ground into powder to obtain modified starch B.

[0047] Example 4

[0048] A method for preparing a starch slurry for sizing glass fiber yarn for weaving, referring to Example 1, except that the type of silane coupling agent selected in step (3) is different, and silane coupling agent KH-560 is selected as the silane coupling agent instead of vinyl trimethoxy silane.

[0049] Example 5

[0050] A method for preparing starch slurry for sizing glass fiber yarn for weaving, referring to Example 1, except that the type of functional monomer selected in step (4) is different, acrylic acid is selected as the functional monomer to replace 3-chloro-2-hydroxypropyltrimethylammonium chloride, and the catalyst used is ammonium persulfate, and the amount used is 0.5% to 2% of the mass of the acrylic acid monomer.

[0051] Comparative Example 1

[0052] A method for preparing a starch slurry for sizing glass fiber yarn for weaving, referring to Example 1, except that step (3) is replaced by:

[0053] (3) dispersing the acid-hydrolyzed starch prepared in step (2) in deionized water to prepare starch milk; placing the starch milk in a four-necked flask, adjusting the pH value of the starch milk to 3-4 with a dilute hydrochloric acid solution, heating in a water bath to 30° C., adding ethyl acetate and a 0.5% by mass ammonium ferrous sulfate solution and a 1.0% by mass hydrogen peroxide aqueous solution to the starch milk under nitrogen protection, wherein the amount of the ammonium ferrous sulfate solution and the amount of the hydrogen peroxide aqueous solution are 0.1%-0.5% and 0.5%-2% by mass of the monomer, respectively, to carry out a reaction, wherein in the reaction system, the mass fraction of starch is 25%, and the mass fraction of ethyl acetate is 1.5%. The reaction is completed after 3 hours, and the resultant is filtered, washed, dried, and ground into powder to obtain modified starch A.

[0054] Comparative Example 2

[0055] A method for preparing a starch slurry for sizing glass fiber yarn for weaving, referring to Example 1, except that step (4) is replaced by:

[0056] (4) dispersing the modified starch A prepared in step (3) in deionized water to prepare starch milk; placing the starch milk in a four-necked flask, placing it in a water bath at 35° C., adding octenyl succinic anhydride, adjusting the pH value of the system to 8.5 with a 5% by mass sodium hydroxide solution, and reacting, wherein the mass fraction of starch in the reaction system is 25%, and the mass fraction of octenyl succinic anhydride is 1.5%. The reaction is completed after 3 hours, and the resultant is filtered, washed, dried, and ground into powder to obtain modified starch B.

[0057] Comparative Example 3

[0058] A method for preparing starch slurry for sizing glass fiber yarn for weaving is described in Example 1, except that the order of step (3) and step (4) is adjusted, i.e., functional monomers are modified first to obtain modified starch A', and then modified with a silane coupling agent to obtain modified starch B'.

[0059] Comparative Example 4

[0060] A method for preparing a starch slurry for sizing glass fiber yarn for weaving, referring to Example 1, except that step (3) and step (4) are replaced by:

[0061] (a) dispersing the acid-hydrolyzed starch prepared in step (2) in deionized water to prepare starch milk; placing the starch milk in a four-necked flask, adjusting the pH value of the system to 11-12 with a 5% by mass sodium hydroxide solution, adding vinyl trimethoxysilane, and then adding 3-chloro-2-hydroxypropyl trimethyl ammonium chloride and sodium hydroxide, and reacting in a water bath at 50° C., wherein the mass fraction of starch in the reaction system is 25%, the mass fraction of vinyl trimethoxysilane is 0.5%, the mass fraction of 3-chloro-2-hydroxypropyl trimethyl ammonium chloride is 0.5%, and the molar ratio of 3-chloro-2-hydroxypropyl trimethyl ammonium chloride to sodium hydroxide is 1:1; after 6 hours, the reaction is completed, and the resultant is filtered, washed, dried, and ground into powder to obtain modified starch.

[0062] Comparative Example 5

[0063] A method for preparing starch slurry for sizing glass fiber yarn for weaving is described with reference to Example 1, except that the type of silane coupling agent used in step (3) is different, and silane coupling agent KH-550 is selected as the silane coupling agent.

[0064] Comparative Example 6

[0065] A method for preparing a starch slurry for sizing glass fiber yarn for weaving, referring to Example 1, except that the type of functional monomer selected in step (4) is different, acrylonitrile is selected as the functional monomer to replace 3-chloro-2-hydroxypropyltrimethylammonium chloride, and the catalyst is replaced by sodium bisulfite and potassium persulfate, and the amounts used are 0.1% to 0.5% and 0.5% to 2% of the mass of the acrylonitrile monomer, respectively.

[0066] Comparative Example 7

[0067] A method for preparing starch slurry for sizing glass fiber yarn for weaving is described with reference to Example 1, except that the functional monomer modification in step (4) is omitted.

[0068] Comparative Example 8

[0069] A method for preparing starch slurry for sizing glass fiber yarn for weaving is described with reference to Example 1, except that step (2) is omitted and starch that has not been acid-lyzed is used as raw material.

[0070] Comparative Example 9

[0071] A method for preparing starch slurry for sizing glass fiber yarn for weaving is described with reference to Example 1, except that step (1) is omitted and unrefined starch is used as raw material.

[0072] Comparative Example 10

[0073] Referring to Example 3 of CN115536791A, ethyl methacrylate monomer and acrylic acid monomer were used to prepare starch grafted diblock polymer slurry.

[0074] Application Examples

[0075] The starch sizing material for sizing glass fiber yarn for weaving prepared in the above-mentioned embodiments and comparative examples is used in sizing glass fiber yarn for weaving. The glass fiber yarn used is 24-count, 1-ply alkali-free waxed glass fiber yarn provided by Yushun Textile Co., Ltd. The sizing process includes the following steps:

[0076] A GA392 electronic single yarn sizing machine was used for sizing tests. The sizing tank temperature was set to 75°C, the pre-drying temperature was set to 120°C, and the drying temperature was set to 100°C. The starch slurry for sizing the glass fiber yarn for weaving was poured into the sizing tank, and the glass fiber yarn was wound on the sizing machine for sizing. The sizing speed was 20m / min, and the sizing tension was 0.5N. After sizing, the yarn tube was taken out to obtain the product.

[0077] Test Case

[0078] According to the method of the application example, the starch slurry for sizing the glass fiber yarn for weaving prepared in each embodiment and the comparative example was used to size the glass fiber yarn, and the wear resistance of the product was tested by the wear tester test method with reference to the standard FZ / T01058-1999 "Yarn Wear Resistance Test Method Reciprocating Grinding Roller Method", and the number of friction fractures was used as the wear resistance index; the performance test was carried out with reference to the determination of breaking strength and breaking elongation of textile glass fiber yarn GB / T7690.3-2013; the sizing rate was tested according to the desizing method, and the results are summarized as shown in Table 1.

[0079] Table 1

[0080]

[0081] The embodiments provided above are not intended to limit the scope of the present invention, and the steps described are not intended to limit the execution order thereof. Those skilled in the art may make obvious improvements to the present invention in combination with existing common knowledge, which also fall within the scope of protection defined by the claims of the present invention.

Claims

1. A method for preparing a starch slurry for sizing glass fiber yarn for weaving, characterized in that: The steps include: (1) Starch refining: using methanol aqueous solution to purify starch to obtain refined starch; (2) acid hydrolysis of starch: acid hydrolyzing the refined starch prepared in step (1) to obtain acid-hydrolyzed starch; (3) Silane coupling agent modification: dispersing the acid-decomposed starch prepared in step (2) in water to prepare starch emulsion; mixing the starch emulsion, silane coupling agent and catalyst a under inert atmosphere and water bath heating conditions to obtain modified starch A; wherein the silane coupling agent comprises at least one of vinyl trimethoxy silane, vinyl triisopropoxy silane, silane coupling agent KH-560 or γ-aminopropyl triethoxy silane; in the reaction system, the mass fraction of the acid-decomposed starch is 25-40%, and the mass fraction of the silane coupling agent is 0.5-2%; (4) Functional monomer modification: the modified starch A prepared in step (3) is dispersed in water to prepare starch emulsion; the starch emulsion, the functional monomer and the catalyst b are mixed and reacted under an inert atmosphere and water bath heating conditions to obtain modified starch B; wherein the functional monomer comprises at least one of 3-chloro-2-hydroxypropyltrimethylammonium chloride, butyl acrylate, sodium allyl sulfonate, acrylic acid or methyl acrylate; in the reaction system, the mass fraction of the acid-decomposed starch is 25-40%, and the mass fraction of the silane coupling agent is 0.5-2%; (5) Slurry preparation: the modified starch B prepared in step (4) is dispersed in water to prepare a starch emulsion; gelatinization is performed, a textile auxiliary agent is added, and the mixture is mixed to obtain a starch slurry for sizing glass fiber yarn for weaving.

2. The preparation method according to claim 1, characterized in that: The silane coupling agent is vinyl trimethoxy silane; the functional monomer is 3-chloro-2-hydroxypropyl trimethyl ammonium chloride or acrylic acid.

3. The preparation method according to claim 1, characterized in that: The silane coupling agent is silane coupling agent KH-560; the functional monomer is sodium allyl sulfonate or 3-chloro-2-hydroxypropyltrimethylammonium chloride.

4. The preparation method according to claim 1, characterized in that: The silane coupling agent is vinyl triisopropoxy silane; and the functional monomer is butyl acrylate.

5. The preparation method according to claim 1, characterized in that: The starch in step (1) includes at least one of corn starch, tapioca starch, potato starch, sweet potato starch or wheat starch.

6. The preparation method according to claim 1, characterized in that: The catalyst a comprises: sodium hydroxide or hydrogen peroxide and ammonium ferrous sulfate catalyst system; In step (3), the reaction temperature is 50-70° C. and the reaction time is 4-6 h.

7. The preparation method according to claim 1, characterized in that: The catalyst b comprises: sodium hydroxide; or, a catalyst system of ascorbic acid, pentamethyldiethylenetriamine and copper bromide; or, a catalyst system of hydrogen peroxide and ammonium ferrous sulfate; In step (4), the reaction temperature is 50-70° C. and the reaction time is 4-8 h.

8. The preparation method according to claim 1, characterized in that: In step (5), the textile auxiliary agent includes acrylate; the mass ratio of acrylate to modified starch B is (5-25):

100.

9. Starch sizing material for sizing glass fiber yarn for weaving obtained by the method according to any one of claims 1 to 8.

10. Use of the starch sizing agent for sizing glass fiber yarn for weaving according to claim 9 in starch sizing agent for sizing glass fiber yarn for weaving.

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