High-stability starch-based impregnating compound as well as preparation method and application thereof

Abstract

The invention relates to a high-stability starch-based impregnating compound and a preparation method and application thereof, the preparation method of the impregnating compound adopts two cross-linking steps of low-temperature cross-linking and high-temperature gelatinization, so that internal and external molecular chains of starch particles are fully cross-linked, and the stability of the impregnating compound is improved. Besides, an anti-aging agent formed by combining tea polyphenol, lactic acid and carboxymethyl tamarind gum is selected and added in the preparation method of the impregnating compound, and the anti-aging property of the starch-based impregnating compound is remarkably improved through the synergistic effect of the anti-aging agent, so that when the starch-based impregnating compound is applied to glass fiber textile products, the anti-aging property of the glass fiber textile products is improved, and the service life of the glass fiber textile products is prolonged. According to the present invention, the composite fiber material can rapidly permeate into the fiber so as to improve the internal structure of the fiber, such that the tensile property of the fiber is improved, the continuity and the stability of the improvement effect can be ensured, the fiber can be smooth during the processing process, and the phenomena of end breaking, filament flying and the like can be reduced.

Description

Technical Field

[0001] The invention relates to the technical field of wetting agents, and in particular to a highly stable starch-based wetting agent and a preparation method and application thereof. Background Art

[0002] For a long time, paraffin-type sizing agents have been mainly used in the production process of glass fiber in my country. However, this sizing agent contains dicyandiamide-type color fixatives that are difficult to clean thoroughly. If they are not completely removed, brown streaks will be left on the fiber surface or yellowing will occur. At the same time, these color fixatives may also pose a threat to human health. In contrast, starch, as a non-toxic, harmless, widely available and green material, is easy to clean and fits the concept of green and recyclable development very well. However, starch-type sizing agents need to undergo a gelatinization process before being put into use, that is, the melting of the microcrystalline bundles inside the starch. In this process, the hydrogen bonds between starch molecules are broken and new hydrogen bonds are formed with water molecules, resulting in an increase in the viscosity of the system. However, the properties of gelatinized starch are extremely unstable and age rapidly, which will cause the performance of the sizing agent to decline rapidly, thereby affecting its lubrication and bundling effects. Specifically, the molecular structure of the aged starch changes, and its affinity with the surface of the glass fiber is weakened, resulting in reduced adhesion performance, and easy powdering and shedding. In addition, the aged sizing agent may also affect the surface morphology of the glass fiber, thereby affecting its subsequent processing and performance.

[0003] Therefore, there is an urgent need to develop a starch-based impregnating agent that can improve the stability of glass fiber, so as to achieve better bundling effect and effectively reduce the flying and hairy wire phenomena during the drawing process. Summary of the invention

[0004] The purpose of the present invention is to overcome the deficiencies of the prior art and provide a highly stable starch-based wetting agent and a preparation method and application thereof.

[0005] To achieve the above object, the technical solution adopted by the present invention is: In a first aspect, the present invention provides a method for preparing a highly stable starch-based wetting agent, characterized in that it comprises the following steps: S1. Adding a composite modified starch to an ethanol aqueous solution, adding alkali to adjust the pH to 11-13, then adding sodium trimetaphosphate, and performing a cross-linking reaction at 20-50° C. for 2-3 hours, adding acid to adjust the pH to 5-6, and filtering to obtain a solid, wherein the composite modified starch is at least two of hydroxypropyl starch, oxidized starch and acid-treated starch; S2. Add water to the solid to prepare a starch milk with a solid content of 30 - 35%, add sodium trimetaphosphate, anti-aging agent and additives for mixing, and gelatinize at 80 - 90 °C for 1 - 2 h to obtain the high-stability starch-based sizing agent. Among them, the anti-aging agent is a composition of tea polyphenols, lactic acid and carboxymethyl tamarind gum.

[0006] In the preparation process of the sizing agent of the present invention, the composite modified starch is crosslinked twice. The first crosslinking is carried out under alkaline conditions and at a relatively low temperature of 20 - 50 °C. The alkaline conditions make the solubility of the composite modified starch greater. Sodium trimetaphosphate crosslinks with the hydroxyl groups in each modified starch to form phosphate ester bonds. However, most of the crosslinking bonds in this reaction are on the surface of the starch granules. To avoid the destruction of the newly formed crosslinking bonds by high temperature, the first crosslinking is carried out at a lower temperature, and then it is gelatinized at 80 - 90 °C, which is the second crosslinking. In this way, the molecular chains inside and outside the starch granules can be fully crosslinked, improving the stability of the sizing agent.

[0007] In the process of gelatinizing the starch at 80 - 90 °C in the present invention, an anti-aging agent is also added. The anti-aging agent is composed of tea polyphenols, lactic acid and carboxymethyl tamarind gum. Among them, tea polyphenols can inhibit the oxidative degradation of starch, maintain the integrity of the molecular chain, and reduce the structural damage caused by aging; carboxymethyl tamarind gum belongs to water-soluble polymers, which can effectively lock water, reduce the water separation phenomenon (syneresis) of starch gels, and inhibit aging accelerated by water loss. It also has good film-forming properties; the phenolic hydroxyl groups of tea polyphenols form hydrogen bond networks with the unreacted hydroxyl groups in hydroxypropyl starch, oxidized starch and acid-treated starch. Lactic acid can lower the pH value of the system and may enhance the ability of hydroxyl groups as hydrogen bond donors through protonation, thus promoting the formation of hydrogen bonds. At the same time, the carboxylic acid groups contained in lactic acid and the hydroxyl and carboxylic acid groups contained in carboxymethyl tamarind gum can also participate in the construction of hydrogen bond networks, thereby further promoting the formation of hydrogen bonds and increasing the density of hydrogen bonds. The increase in hydrogen bonds promotes the order of the starch network structure after gelatinization, which has a positive effect on the stability of the sizing agent. In summary, the anti-aging agent composed of tea polyphenols, lactic acid and carboxymethyl tamarind gum can significantly improve the anti-aging property of starch after gelatinization through their synergistic effect, thereby enhancing the stability of the starch-based sizing agent and ensuring that it can exert the expected sizing effect during use.

[0008] Preferably, in the step S1, the mass concentration of the ethanol aqueous solution is 40 - 50%, and the addition amount of the ethanol aqueous solution is 2 - 3 times the total mass of the composite modified starch; the base is a sodium hydroxide solution with a mass concentration of 50 - 60%; the acid is at least one of a sulfuric acid solution with a mass concentration of 50 - 60%, a nitric acid solution with a mass concentration of 50 - 60% and a hydrochloric acid solution with a mass concentration of 50 - 60%.

[0009] Preferably, the total amount of sodium trimetaphosphate used is 1-2% of the mass of the composite modified starch, and the amount of sodium trimetaphosphate used in step S1 is 60-70% of the total amount of sodium trimetaphosphate.

[0010] Preferably, the composite modified starch is a composition of hydroxypropyl starch, oxidized starch and acid-treated starch with a mass ratio of 1:1:(1-2). Among them, the starch-based sizing agent made of hydroxypropyl starch, oxidized starch and acid-treated starch has high stability because they all have the characteristics of low gelatinization temperature, strong fluidity, weak retrogradation and high stability, and can cooperate to play a stabilizing role in the sizing agent, improving the binding force and stability between the sizing agent and the fiber.

[0011] Preferably, the amount of the anti-aging agent used is 0.1-0.5% of the total mass of the composite modified starch; the mass ratio of tea polyphenols, lactic acid and carboxymethyl tamarind gum is 1:(2-3):(0.3-0.5).

[0012] Preferably, the auxiliary agents are lubricants, emulsifiers, preservatives and defoamers. The amount of the lubricant used is 20-25% of the mass of the composite modified starch, the amount of the emulsifier used is 3-5% of the mass of the composite modified starch, the amount of the preservative used is 1-2% of the mass of the composite modified starch, and the amount of the defoamer used is 0.06-0.1% of the mass of the composite modified starch.

[0013] Preferably, the lubricant is ethylene bisoleamide.

[0014] Preferably, the preservative is sodium methylparaben.

[0015] Preferably, the emulsifier is fatty acid polyoxyethylene ester.

[0016] Preferably, the defoamer is a phosphate defoamer.

[0017] In a second aspect, the present invention provides a starch-based sizing agent with high stability, which is prepared by the preparation method of the starch-based sizing agent with high stability described in the first aspect.

[0018] In a third aspect, the present invention provides the application of the starch-based sizing agent with high stability described in the second aspect in the preparation of glass fiber textile products.

[0019] Compared with the prior art, the beneficial effects of the present invention are as follows: (1) In the present invention, tea polyphenols, lactic acid and carboxymethyl tamarind gum are selected as anti-aging agents. Through their synergistic effect, the anti-aging property of starch after gelatinization can be significantly improved. This anti-aging agent can not only extend the shelf life of starch paste, but also improve the transparency and stability of starch paste. When the starch-based sizing agent of the present invention is applied to glass fiber textile products, it can quickly penetrate into the fiber interior, improve the internal structure of the fiber, thereby enhancing the tensile property of the fiber, and can also ensure the persistence and stability of the above improvement effect, making the fiber processing more smooth and reducing the occurrence of phenomena such as broken ends and flying filaments.

[0020] (2) In the preparation method of the high-stability starch-based sizing agent of the present invention, two cross-linking steps of low-temperature cross-linking first and then high-temperature gelatinization are adopted, so that the molecular chains inside and outside the starch granules are fully cross-linked, improving the stability of the sizing agent. Specific Embodiments

[0021] To better illustrate the purpose, technical solution and advantages of the present invention, the present invention will be further described below in conjunction with specific embodiments.

[0022] The sources of raw materials mentioned in the following examples and comparative examples are as follows: Hydroxypropyl starch: The manufacturer is Yinglian Industrial Technology (Nanjing) Co., Ltd., and the model is E1440; Oxidized starch: The manufacturer is Yinglian Industrial Technology (Nanjing) Co., Ltd., and the model is E1404; Acid-treated starch: The manufacturer is Yinglian Industrial Technology (Nanjing) Co., Ltd., and the model is E1401; Sodium trimetaphosphate: The manufacturer is Guangdong Wengjiang Chemical Reagent Co., Ltd., and the model is PA00224; Tea polyphenols: The manufacturer is Hebei Yaxin Biotechnology Co., Ltd., and the model is 321457; Lactic acid: The manufacturer is Shanghai Yuanye Biotechnology Co., Ltd., and the model is S30746; Carboxymethyl tamarind gum: The manufacturer is NEPTUNE INDUSTRIES company, and the model is CMT-HV; Ethylene bisoleamide: The manufacturer is Guangdong Wengjiang Chemical Reagent Co., Ltd., and the model is PA12872; Fatty acid polyoxyethylene ester: The manufacturer is Jiangsu Haian Petrochemical Factory, model SG-9; Preservative: Sodium methyl p-hydroxybenzoate, the manufacturer is Guangdong Wengjiang Chemical Reagent Co., Ltd., brand PA59051; Defoamer: Phosphate defoamer, the manufacturer is Guangzhou Openg Chemical Co., Ltd., model MOUSSEX ® 941PL; Other materials, reagents, etc. used in the examples and comparative examples can be obtained from commercial sources unless otherwise specified.

[0023] Example 1 A highly stable starch-based sizing agent, comprising raw materials in the following parts by weight: 100 parts of composite modified starch, 1.5 parts of sodium trimetaphosphate, 0.3 part of anti-aging agent, 23 parts of lubricant, 4 parts of emulsifier, 1 part of preservative, and 0.08 part of defoaming agent; The composite modified starch is composed of hydroxypropyl starch, oxidized starch, and acid-treated starch in a mass ratio of 1:1:1.5; The anti-aging agent is composed of tea polyphenols, lactic acid, and carboxymethyl tamarind gum in a mass ratio of 1:2.5:0.4; The lubricant is ethylene bisoleamide, the preservative is sodium methyl p-hydroxybenzoate, the emulsifier is fatty acid polyoxyethylene ester, and the defoaming agent is a phosphate defoaming agent; The preparation method of the starch-based sizing agent comprises the following steps: S1. Add the composite modified starch into an ethanol aqueous solution with a mass concentration of 45%, add a sodium hydroxide solution with a mass concentration of 55% to adjust the pH to 12, then add sodium trimetaphosphate, and carry out a cross-linking reaction at 40 °C for 2.5 h. Add a sulfuric acid solution with a mass concentration of 50% to adjust the pH to 5, and filter to obtain a solid. Among them, the dosage of sodium trimetaphosphate is 65% of the total dosage of sodium trimetaphosphate; the addition amount of the ethanol aqueous solution is 2.5 times the total mass of the composite modified starch; S2. Add water to the solid to prepare a starch milk with a solid content of 32%, add the remaining sodium trimetaphosphate, anti-aging agent, lubricant, emulsifier, preservative, and defoaming agent for mixing, and gelatinize at 85 °C for 1.5 h to obtain the highly stable starch-based sizing agent.

[0024] Example 2 A highly stable starch-based sizing agent, comprising raw materials in the following parts by weight: 100 parts of composite modified starch, 1 part of sodium trimetaphosphate, 0.1 part of anti-aging agent, 20 parts of lubricant, 3 parts of emulsifier, 1 part of preservative, and 0.06 part of defoaming agent; The composite modified starch is composed of hydroxypropyl starch, oxidized starch, and acid-treated starch in a mass ratio of 1:1:1; The anti-aging agent is composed of tea polyphenols, lactic acid, and carboxymethyl tamarind gum in a mass ratio of 1:2:0.3; The lubricant is ethylene bisoleamide, the preservative is sodium methyl p-hydroxybenzoate, the emulsifier is fatty acid polyoxyethylene ester, and the defoaming agent is a phosphate defoaming agent; The preparation method of the starch-based sizing agent is characterized by comprising the following steps: S1. Add the composite modified starch into an ethanol aqueous solution with a mass concentration of 40%, add a sodium hydroxide solution with a mass concentration of 50% to adjust the pH to 13, then add sodium trimetaphosphate, and carry out a cross-linking reaction at 20 °C for 3 h. Then add a nitric acid solution with a mass concentration of 50% to adjust the pH to 5, and filter to obtain a solid. Among them, the dosage of sodium trimetaphosphate is 60% of the total dosage of sodium trimetaphosphate; the addition amount of the ethanol aqueous solution is 2 times the total mass of the composite modified starch; S2. Add water to the solid to prepare a starch milk with a solid content of 30%, then add the remaining sodium trimetaphosphate, anti-aging agent, lubricant, emulsifier, preservative and defoaming agent for mixing, and gelatinize at 80 °C for 2 h to obtain the high-stability starch-based sizing agent.

[0025] Example 3 A high-stability starch-based sizing agent, comprising the following raw materials in parts by weight: 100 parts of composite modified starch, 2 parts of sodium trimetaphosphate, 0.5 part of anti-aging agent, 25 parts of lubricant, 5 parts of emulsifier, 2 parts of preservative and 0.1 part of defoaming agent; The composite modified starch is composed of hydroxypropyl starch, oxidized starch and acid-treated starch with a mass ratio of 1:1:2; The anti-aging agent is composed of tea polyphenols, lactic acid and carboxymethyl tamarind gum with a mass ratio of 1:3:0.5; The lubricant is ethylene bisoleamide, the preservative is sodium methyl p-hydroxybenzoate, the emulsifier is fatty acid polyoxyethylene ester, and the defoaming agent is a phosphate defoaming agent; The preparation method of the starch-based sizing agent is characterized by comprising the following steps: S1. Add the composite modified starch into an ethanol aqueous solution with a mass concentration of 50%, add a sodium hydroxide solution with a mass concentration of 60% to adjust the pH to 13, then add sodium trimetaphosphate, and carry out a cross-linking reaction at 50 °C for 2 h. Then add a hydrochloric acid solution with a mass concentration of 60% to adjust the pH to 6, and filter to obtain a solid. Among them, the dosage of sodium trimetaphosphate is 70% of the total dosage of sodium trimetaphosphate; the addition amount of the ethanol aqueous solution is 3 times the total mass of the composite modified starch; S2. Add water to the solid to prepare a starch milk with a solid content of 35%, then add the remaining sodium trimetaphosphate, anti-aging agent, lubricant, emulsifier, preservative and defoaming agent for mixing, and then gelatinize at 90 °C for 1 h, which is the second cross-linking, to obtain the high-stability starch-based sizing agent.

[0026] Example 4 Example 4 is different from Example 1 in that: the total mass of the composite modified starch remains unchanged, hydroxypropyl starch is not added, and the composite modified starch is composed of oxidized starch and acid-treated starch with a mass ratio of 1:1.5.

[0027] Example 5 Example 5 is different from Example 1 in that: the total mass of the composite modified starch remains unchanged, oxidized starch is not added, and the composite modified starch is composed of hydroxypropyl starch and acid-treated starch with a mass ratio of 1:1.5.

[0028] Example 6 Example 6 is different from Example 1 in that: the total mass of the composite modified starch remains unchanged, acid-treated starch is not added, and the composite modified starch is composed of hydroxypropyl starch and oxidized starch with a mass ratio of 1:1.

[0029] Comparative Example 1 Comparative Example 1 is different from Example 1 in that: Comparative Example 1 only undergoes cross-linking once, that is, it does not go through step S1. The specific steps are: preparing a starch milk with a solid content of 32% by adding water to the composite modified starch, then adding sodium trimetaphosphate, anti-aging agent, lubricant, emulsifier, preservative, and defoaming agent for mixing, and gelatinizing at 85°C for 4 h to obtain the starch-based sizing agent.

[0030] Comparative Example 2 Comparative Example 2 is different from Example 1 in that: the anti-aging agent is not added in Comparative Example 2, and the missing amount is supplemented with a composite modified starch, sodium trimetaphosphate, lubricant, emulsifier, preservative, and defoaming agent with a mass ratio of 100:1.5:23:4:1:0.08.

[0031] Comparative Example 3 Comparative Example 3 is different from Example 1 in that: the total amount of the anti-aging agent remains unchanged, tea polyphenols are not added, and the anti-aging agent is composed of lactic acid and carboxymethyl tamarind gum with a mass ratio of 2.5:0.4.

[0032] Comparative Example 4 Comparative Example 4 is different from Example 1 in that: the total amount of the anti-aging agent remains unchanged, lactic acid is not added, and the anti-aging agent is composed of tea polyphenols and carboxymethyl tamarind gum with a mass ratio of 1:0.4.

[0033] Comparative Example 5 Comparative Example 5 is different from Example 1 in that: the total amount of the anti-aging agent remains unchanged, carboxymethyl tamarind gum is not added, and the anti-aging agent is composed of tea polyphenols and lactic acid with a mass ratio of 1:2.5.

[0034] Product performance test The sizing agents of Examples 1-6 and Comparative Examples 1-5 were respectively coated on D450 (monofilament diameter 4 μm) ultra-fine glass fiber yarns. The oiling line speed was 20 m / min, the oil content of the cheese was controlled at 1.2 ± 0.20%, and the weaving speed was 500 rpm to obtain glass fiber samples of each group. The following water resistance tests and product performance tests were carried out on the glass fiber samples respectively.

[0035] Glass fiber samples prepared from the sizing agents of Examples 1-6 and Comparative Examples 1-5 were respectively tested for tensile displacement, migration amount, filament breakage rate, hairiness rate and yield. The specific test methods are as follows: Tensile displacement: Take out equal amounts of glass fiber filaments with a length of 250 mm from each group and conduct a tensile experiment using the flat pneumatic clamping method. As the test progresses, the monofilaments gradually break, and the sound of breakage gradually becomes louder and denser. Visual observation shows that the filament bundle gradually becomes rough from smooth. Gradually increase the tensile strength and record the tensile displacement when the filament bundle becomes rough. Migration amount: Test the migration amount of the glass fiber samples according to the method of GB31604.8—2021. Filament breakage rate: Use a microscope to magnify and observe the samples, record the number of partially broken and completely broken filaments, and calculate the filament breakage rate of the glass fiber samples. Hairiness rate: Use a microscope to magnify and observe the samples, record the number of end hairiness, loops and clips, and calculate the hairiness rate of the glass fiber samples. Yield: Visually select glass fiber yarns with uniform yarn diameter and smooth surface, without obvious defects and impurities as finished products, record their quantity, and calculate the yield of the glass fiber samples. The test results are shown in Table 1.

[0036] Table 1 Performance data of each group of samples Group Tensile displacement / mm Migration rate / % Wire breakage rate / % Hairiness rate / % Yield rate / % Example 1 15.3 1.64 0.41 0.47 95.8 Example 2 15.1 1.78 0.55 0.53 95.0 Example 3 15.0 1.72 0.46 0.49 95.5 Example 4 13.4 2.20 0.75 0.97 93.3 Example 5 13.0 2.17 0.77 0.87 93.8 Example 6 13.5 2.26 0.80 0.88 93.1 Comparative Example 1 9.4 8.93 4.74 5.72 87.0 Comparative Example 2 8.0 9.25 5.27 6.75 77.3 Comparative Example 3 9.5 6.89 4.37 5.81 81.1 Comparative Example 4 9.4 6.93 4.40 5.76 81.3 Comparative Example 5 9.2 6.82 4.43 5.84 80.5 As can be seen from Table 1, by combining the data of Example 1 and Examples 4-6, it can be known that when hydroxypropyl starch, oxidized starch and acid-treated starch are selected as composite modified starches, the three can synergistically play a stabilizing role in the sizing agent, improving the binding force and stability between the sizing agent and the fiber.

[0037] By combining the data of Example 1 and Comparative Example 1, it can be known that in the preparation process of the sizing agent of the present invention, the composite modified starch is subjected to two cross-linking steps of low-temperature cross-linking first and then high-temperature gelatinization, so that the molecular chains inside and outside the starch granules are fully cross-linked. This can not only improve the stability and film-forming property of the film-forming agent, but also enhance the adhesion to the fiber, thereby improving the performance of glass fiber products.

[0038] Combined with the data of Example 1 and Comparative Examples 2-5, it can be seen that choosing tea polyphenols, lactic acid and carboxymethyl tamarind gum as anti-aging agents can synergistically improve the anti-aging property of the sizing agent, thereby effectively improving the tensile property of the fiber product, making the fiber more smooth during the processing, and reducing the occurrence of phenomena such as broken ends and flying filaments.

[0039] 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 the protection scope of the present invention. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present invention can be modified or equivalently replaced without departing from the essence and scope of the technical solutions of the present invention.

Claims

1. A method for preparing a highly stable starch-based wetting agent, characterized in that: The following steps are involved: S1. Adding a composite modified starch to an ethanol aqueous solution, adding alkali to adjust the pH to 11-13, then adding sodium trimetaphosphate, and performing a cross-linking reaction at 20-50° C. for 2-3 hours, adding acid to adjust the pH to 5-6, and filtering to obtain a solid, wherein the composite modified starch is at least two of hydroxypropyl starch, oxidized starch and acid-treated starch; S2. Add water to the solid to prepare a starch milk with a solid content of 30-35%, add sodium trimetaphosphate, an anti-aging agent and an auxiliary agent to mix, and gelatinize at 80-90° C. for 1-2 hours to obtain the highly stable starch-based wetting agent, wherein the anti-aging agent is a combination of tea polyphenols, lactic acid and carboxymethyl tamarind gum.

2. The method for preparing a highly stable starch-based wetting agent according to claim 1, characterized in that: In the step S1, the mass concentration of the ethanol aqueous solution is 40-50%, and the amount of the ethanol aqueous solution added is 2-3 times the total mass of the composite modified starch; the alkali is a sodium hydroxide solution with a mass concentration of 50-60%; the acid is at least one of a sulfuric acid solution, a nitric acid solution and a hydrochloric acid solution with a mass concentration of 50-60%.

3. The method for preparing a highly stable starch-based wetting agent according to claim 1, characterized in that: The total amount of the sodium trimetaphosphate used is 1-2% of the mass of the composite modified starch, and the amount of the sodium trimetaphosphate used in step S1 is 60-70% of the total amount of the sodium trimetaphosphate used.

4. The method for preparing a highly stable starch-based wetting agent according to claim 1, characterized in that: The composite modified starch is a composition of hydroxypropyl starch, oxidized starch and acid-treated starch in a mass ratio of 1:1:(1-2).

5. The method for preparing a highly stable starch-based wetting agent according to claim 1, characterized in that: The dosage of the anti-aging agent is 0.1-0.5% of the total mass of the composite modified starch, and the mass ratio of the tea polyphenols, lactic acid and carboxymethyl tamarind gum is 1:(2-3):(0.3-0.5).

6. The method for preparing a highly stable starch-based wetting agent according to claim 1, characterized in that: The auxiliary agents are lubricants, emulsifiers, preservatives and defoamers. The amount of the lubricant is 20-25% of the mass of the composite modified starch, the amount of the emulsifier is 3-5% of the mass of the composite modified starch, the amount of the preservative is 1-2% of the mass of the composite modified starch, and the amount of the defoamer is 0.06-0.1% of the mass of the composite modified starch.

7. The method for preparing a highly stable starch-based wetting agent according to claim 6, characterized in that: The auxiliary agent is selected from at least one of the following (I)-(IV): (I) The lubricant is ethylene bisoleamide; (II) the preservative is sodium methyl paraben; (III) the emulsifier is polyoxyethylene fatty acid ester; (IV) The defoaming agent is a phosphate defoaming agent.

8. A highly stable starch-based wetting agent, characterized in that: The invention is prepared by the preparation method of the high-stability starch-based wetting agent described in any one of claims 1 to 6.

9. Use of the highly stable starch-based wetting agent according to claim 8 in the preparation of glass fiber textile products.