A high-stability starch-based wetting agent and its preparation method and application

Abstract

The present invention relates to a highly stable starch-based wetting agent, a preparation method thereof, and an application thereof. The preparation method of the wetting agent employs two crosslinking steps: low-temperature crosslinking followed by high-temperature gelatinization, so that the molecular chains inside and outside the starch granules are fully crosslinked, thereby improving the stability of the wetting agent. In addition, the preparation method of the wetting agent further selectively incorporates an anti-aging agent composed of tea polyphenols, lactic acid, and carboxymethyl tamarind gum. Through their synergistic effect, the anti-aging properties of the starch-based wetting agent are significantly improved. When the starch-based wetting agent of the present invention is applied to glass fiber textile products, it can quickly penetrate into the interior of the fiber, improve the internal structure of the fiber, thereby improving the tensile properties of the fiber. The sustainability and stability of the aforementioned improvement effect can also be ensured, making the fiber smoother during processing and reducing the occurrence of breakage, flying threads, and the like.

Description

Technical Field

[0001] The present 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, my country's glass fiber production process has primarily relied on paraffin-based sizings. However, these sizings contain dicyandiamide-based color fixatives, which are difficult to thoroughly clean. Failure to completely remove them can leave brown streaks or cause yellowing on the fiber surface. These color fixatives can also pose a health risk. In contrast, starch, a non-toxic, widely available, and environmentally friendly material, is easily cleaned and aligns well with the concept of green and recyclable development. However, starch-based sizings must undergo a gelatinization process before use, involving the melting of the starch's internal crystallite bundles. This process breaks hydrogen bonds between starch molecules and forms new hydrogen bonds with water molecules, increasing the viscosity of the system. However, gelatinized starch is extremely unstable and rapidly ages, causing the sizing's performance to rapidly degrade, compromising its lubrication and bundling properties. Specifically, aging changes the starch's molecular structure, weakening its affinity for the glass fiber surface. This results in reduced adhesion and makes it susceptible to dusting and shedding. Furthermore, aging can affect the glass fiber's surface morphology, further impacting its subsequent processing and performance.

[0003] Therefore, there is an urgent need to develop a starch-based wetting agent that can improve the stability of glass fiber, so as to achieve better bundling effect and effectively reduce the flying and hairy fibers 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:

[0006] 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:

[0007] 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;

[0008] 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, 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.

[0009] The present invention performs two cross-linking on the composite modified starch during the preparation process of the wetting agent. The first cross-linking is performed under alkaline conditions at a relatively low temperature of 20-50°C. The alkaline conditions make the composite modified starch more soluble. Sodium trimetaphosphate is cross-linked with hydroxyl groups in each modified starch to form phosphate bonds. However, most of the cross-linking bonds in this reaction are on the surface of starch particles. In order to avoid high temperature from destroying the newly formed cross-linking bonds, the first cross-linking is performed at a relatively low temperature. Then, gelatinization is performed at 80-90°C, which is the second cross-linking. In this way, the molecular chains inside and outside the starch particles can be fully cross-linked, thereby improving the stability of the wetting agent.

[0010] The present invention also adds an anti-aging agent during the gelatinization of starch at 80-90°C. The anti-aging agent is composed of tea polyphenols, lactic acid, and carboxymethyl tamarind gum. The tea polyphenols can inhibit the oxidative degradation of starch, maintain the integrity of the molecular chain, and reduce structural damage caused by aging. The carboxymethyl tamarind gum is a water-soluble polymer that can effectively lock in moisture, reduce the dehydration phenomenon (water separation) of starch gel, inhibit aging accelerated by water loss, and has good film-forming properties. The phenolic hydroxyl groups of the tea polyphenols form a hydrogen bond network with the unreacted hydroxyl groups in hydroxypropyl starch, oxidized starch, and acid-treated starch. The lactic acid can lower the pH value of the system and may enhance the ability of hydroxyl groups to act as hydrogen bond donors through protonation, thereby promoting the formation of hydrogen bonds. At the same time, the carboxylic acid groups contained in the lactic acid and the hydroxyl and carboxylic acid groups contained in the carboxymethyl tamarind gum can also participate in the construction of the hydrogen bond network, 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 wetting agent. In summary, the antioxidant composed of tea polyphenols, lactic acid and carboxymethyl tamarind gum can significantly improve the anti-aging property of starch after gelatinization through its synergistic effect, thereby enhancing the stability of the starch-based wetting agent and ensuring that it can exert the expected wetting effect during use.

[0011] Preferably, in 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%; and 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%.

[0012] Preferably, the total amount of the sodium trimetaphosphate is 1-2% of the mass of the composite modified starch, and the amount of the sodium trimetaphosphate in step S1 is 60-70% of the total amount of the sodium trimetaphosphate.

[0013] Preferably, the composite modified starch is a combination of hydroxypropyl starch, oxidized starch, and acid-treated starch in a mass ratio of 1:1:(1-2). A starch-based wetting agent made from hydroxypropyl starch, oxidized starch, and acid-treated starch exhibits high stability. This is because these starches all possess low gelatinization temperatures, strong fluidity, low retrogradation, and high stability. These starches synergistically stabilize the wetting agent, enhancing the binding and stability between the wetting agent and the fiber.

[0014] Preferably, the amount of the anti-aging agent is 0.1-0.5% of the total mass of the composite modified starch; the mass ratio of the tea polyphenols, lactic acid and carboxymethyl tamarind gum is 1: (2-3): (0.3-0.5).

[0015] Preferably, the auxiliary agents are lubricants, emulsifiers, preservatives and defoaming agents. 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 defoaming agent is 0.06-0.1% of the mass of the composite modified starch.

[0016] Preferably, the lubricant is ethylene bisoleamide.

[0017] Preferably, the preservative is sodium methyl paraben.

[0018] Preferably, the emulsifier is polyoxyethylene fatty acid ester.

[0019] Preferably, the defoaming agent is a phosphate defoaming agent.

[0020] In a second aspect, the present invention provides a highly stable starch-based wetting agent, which is prepared by the method for preparing the highly stable starch-based wetting agent described in the first aspect.

[0021] In a third aspect, the present invention provides use of the highly stable starch-based wetting agent described in the second aspect in the preparation of glass fiber textile products.

[0022] Compared with the prior art, the present invention has the following beneficial effects:

[0023] (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. Such anti-aging agents can not only extend the shelf life of starch paste, but also improve the transparency and stability of starch paste. When the starch-based impregnating agent of the present invention is applied to glass fiber textile products, it can quickly penetrate into the interior of the fiber, improve the internal structure of the fiber, thereby improving the tensile properties of the fiber. It can also ensure the continuity and stability of the above-mentioned improvement effect, make the fiber smoother during processing, and reduce the occurrence of breakage, flying silk and other phenomena.

[0024] (2) The method for preparing the highly stable starch-based wetting agent of the present invention adopts two cross-linking steps of first low-temperature cross-linking and then high-temperature gelatinization, so that the molecular chains inside and outside the starch granules are fully cross-linked, thereby improving the stability of the wetting agent. DETAILED DESCRIPTION

[0025] In order to better illustrate the purpose, technical solutions and advantages of the present invention, the present invention will be further described below in conjunction with specific embodiments.

[0026] The sources of the raw materials mentioned in the following examples and comparative examples are as follows:

[0027] Hydroxypropyl starch: manufacturer is Yinglian Industrial Technology (Nanjing) Co., Ltd., model number is E1440;

[0028] Oxidized starch: manufacturer: Yinglian Industrial Technology (Nanjing) Co., Ltd., model: E1404;

[0029] Acid-treated starch: manufacturer: Yinglian Industrial Technology (Nanjing) Co., Ltd., model: E1401;

[0030] Sodium trimetaphosphate: Manufacturer: Guangdong Wengjiang Chemical Reagent Co., Ltd., model number PA00224;

[0031] Tea polyphenols: manufacturer is Hebei Yaxin Biotechnology Co., Ltd., model number 321457;

[0032] Lactic acid: manufacturer: Shanghai Yuanye Biotechnology Co., Ltd., model number: S30746;

[0033] Carboxymethyl tamarind gum: manufactured by NEPTUNE INDUSTRIES, model number CMT-HV;

[0034] Ethylene bisoleamide: manufacturer: Guangdong Wengjiang Chemical Reagent Co., Ltd., model number PA12872;

[0035] Fatty acid polyoxyethylene ester: manufacturer is Jiangsu Hai'an Petrochemical Plant, model SG-9;

[0036] Preservative: Sodium methyl parahydroxybenzoate, manufactured by Guangdong Wengjiang Chemical Reagent Co., Ltd., brand PA59051;

[0037] Defoaming agent: phosphate defoaming agent, manufactured by Guangzhou Oupeng Chemical Co., Ltd., model number MOUSSEX ® 941PL;

[0038] Unless otherwise specified, other materials, reagents, etc. used in the Examples and Comparative Examples can be obtained from commercial sources.

[0039] Example 1

[0040] A highly stable starch-based wetting agent comprises the following raw materials in parts by weight:

[0041] 100 parts of composite modified starch, 1.5 parts of sodium trimetaphosphate, 0.3 parts of antioxidant, 23 parts of lubricant, 4 parts of emulsifier, 1 part of preservative and 0.08 parts of defoaming agent;

[0042] The composite modified starch is composed of hydroxypropyl starch, oxidized starch and acid-treated starch in a mass ratio of 1:1:1.5;

[0043] 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;

[0044] The lubricant is ethylene bisoleamide, the preservative is sodium methyl parahydroxybenzoate, the emulsifier is fatty acid polyoxyethylene ester, and the defoamer is a phosphate defoamer;

[0045] The preparation method of the starch-based wetting agent comprises the following steps:

[0046] S1. Add the composite modified starch to a 45% ethanol aqueous solution, add a 55% sodium hydroxide solution to adjust the pH to 12, then add sodium trimetaphosphate, and carry out a cross-linking reaction at 40° C. for 2.5 hours, add a 50% sulfuric acid solution to adjust the pH to 5, and filter to obtain a solid, wherein the amount of the sodium trimetaphosphate is 65% of the total amount of the sodium trimetaphosphate; the amount of the ethanol aqueous solution added is 2.5 times the total mass of the composite modified starch;

[0047] S2. Add water to the solid to prepare a starch milk with a solid content of 32%, add the remaining sodium trimetaphosphate, antioxidant, lubricant, emulsifier, preservative and defoamer, mix, and gelatinize at 85° C. for 1.5 hours to obtain the highly stable starch-based wetting agent.

[0048] Example 2

[0049] A highly stable starch-based wetting agent comprises the following raw materials in parts by weight:

[0050] 100 parts of composite modified starch, 1 part of sodium trimetaphosphate, 0.1 part of antioxidant, 20 parts of lubricant, 3 parts of emulsifier, 1 part of preservative and 0.06 part of defoaming agent;

[0051] The composite modified starch is composed of hydroxypropyl starch, oxidized starch and acid-treated starch in a mass ratio of 1:1:1;

[0052] The anti-aging agent is composed of tea polyphenols, lactic acid and carboxymethyl tamarind gum in a mass ratio of 1:2:0.3;

[0053] The lubricant is ethylene bisoleamide, the preservative is sodium methyl parahydroxybenzoate, the emulsifier is fatty acid polyoxyethylene ester, and the defoamer is a phosphate defoamer;

[0054] The preparation method of the starch-based wetting agent is characterized by comprising the following steps:

[0055] S1. Add the composite modified starch to a 40% ethanol aqueous solution, add a 50% sodium hydroxide solution to adjust the pH to 13, then add sodium trimetaphosphate, and carry out a cross-linking reaction at 20° C. for 3 hours, then add a 50% nitric acid solution to adjust the pH to 5, and filter to obtain a solid, wherein the amount of the sodium trimetaphosphate is 60% of the total amount of the sodium trimetaphosphate; the amount of the ethanol aqueous solution added is 2 times the total mass of the composite modified starch;

[0056] S2. Add water to the solid to prepare a starch milk with a solid content of 30%, then add the remaining sodium trimetaphosphate, antioxidant, lubricant, emulsifier, preservative and defoamer, mix, and gelatinize at 80° C. for 2 hours to obtain the highly stable starch-based wetting agent.

[0057] Example 3

[0058] A highly stable starch-based wetting agent comprises the following raw materials in parts by weight:

[0059] 100 parts of composite modified starch, 2 parts of sodium trimetaphosphate, 0.5 parts of antioxidant, 25 parts of lubricant, 5 parts of emulsifier, 2 parts of preservative and 0.1 parts of defoaming agent;

[0060] The composite modified starch is composed of hydroxypropyl starch, oxidized starch and acid-treated starch in a mass ratio of 1:1:2;

[0061] The anti-aging agent is composed of tea polyphenols, lactic acid and carboxymethyl tamarind gum in a mass ratio of 1:3:0.5;

[0062] The lubricant is ethylene bisoleamide, the preservative is sodium methyl parahydroxybenzoate, the emulsifier is fatty acid polyoxyethylene ester, and the defoamer is a phosphate defoamer;

[0063] The preparation method of the starch-based wetting agent is characterized by comprising the following steps:

[0064] S1. Add the composite modified starch to a 50% ethanol aqueous solution, add a 60% sodium hydroxide solution to adjust the pH to 13, then add sodium trimetaphosphate, and carry out a cross-linking reaction at 50° C. for 2 hours, then add a 60% hydrochloric acid solution to adjust the pH to 6, and filter to obtain a solid, wherein the amount of the sodium trimetaphosphate is 70% of the total amount of the sodium trimetaphosphate; the amount of the ethanol aqueous solution added is 3 times the total mass of the composite modified starch;

[0065] S2. Add water to the solid to prepare a starch milk with a solid content of 35%, then add the remaining sodium trimetaphosphate, antioxidant, lubricant, emulsifier, preservative and defoamer and mix them, and then gelatinize at 90° C. for 1 hour, which is the second cross-linking, to obtain the highly stable starch-based wetting agent.

[0066] Example 4

[0067] The difference between Example 4 and Example 1 is 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 in a mass ratio of 1:1.5.

[0068] Example 5

[0069] The difference between Example 5 and Example 1 is that the total mass of the composite modified starch remains unchanged, no oxidized starch is added, and the composite modified starch is composed of hydroxypropyl starch and acid-treated starch in a mass ratio of 1:1.5.

[0070] Example 6

[0071] The difference between Example 6 and Example 1 is 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 in a mass ratio of 1:1.

[0072] Comparative Example 1

[0073] The difference between Comparative Example 1 and Example 1 is that: Comparative Example 1 undergoes only one cross-linking, that is, step S1 is not performed. The specific steps are: adding water to the composite modified starch to prepare a starch milk with a solid content of 32%, then adding sodium trimetaphosphate, an anti-aging agent, a lubricant, an emulsifier, a preservative and a defoaming agent, mixing, and gelatinizing at 85°C for 4 hours to obtain the starch-based wetting agent.

[0074] Comparative Example 2

[0075] The difference between Comparative Example 2 and Example 1 is that: Comparative Example 2 does not add an anti-aging agent, and uses 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 to make up for the missing amount.

[0076] Comparative Example 3

[0077] The difference between Comparative Example 3 and Example 1 is that the total amount of the anti-aging agent remains unchanged, tea polyphenols are not added, and the anti-aging agent consists of lactic acid and carboxymethyl tamarind gum in a mass ratio of 2.5:0.4.

[0078] Comparative Example 4

[0079] The difference between Comparative Example 4 and Example 1 is that the total amount of the anti-aging agent remains unchanged, lactic acid is not added, and the anti-aging agent consists of tea polyphenols and carboxymethyl tamarind gum in a mass ratio of 1:0.4.

[0080] Comparative Example 5

[0081] The difference between Comparative Example 5 and Example 1 is that the total amount of the anti-aging agent remains unchanged, carboxymethyl tamarind gum is not added, and the anti-aging agent consists of tea polyphenols and lactic acid in a mass ratio of 1:2.5.

[0082] Product performance testing

[0083] The sizing agents of Examples 1-6 and Comparative Examples 1-5 were respectively coated on D450 (single filament diameter 4 μm) ultrafine glass fiber yarn. The oil coating line speed was 20 m / min, the oil content of the cop yarn was controlled at 1.2±0.20%, and the weaving speed was 500 rpm to obtain glass fiber samples of each group. The glass fiber samples were subjected to the following water resistance test and product performance test.

[0084] Glass fiber samples prepared with the sizing agents of Examples 1-6 and Comparative Examples 1-5 were respectively tested for tensile displacement, migration, broken fiber rate, hairiness rate, and yield rate. The specific test methods are as follows:

[0085] Tensile displacement: Take out equal amounts of glass fiber bundles with a length of 250mm from each group and perform a tensile test using a flat-plate pneumatic clamping method. As the test progresses, the single filaments gradually break, and the breaking sound gradually becomes louder and more frequent. Visual observation shows that the bundle gradually becomes rough from smooth. Gradually increase the tensile strength, and record the tensile displacement when the bundle becomes rough.

[0086] Migration amount: The migration amount of glass fiber samples was tested according to the method of GB31604.8-2021;

[0087] Broken fiber rate: Use a microscope to magnify and observe the sample, record the number of partial breaks and complete breaks, and calculate the broken fiber rate of the glass fiber sample;

[0088] Hairiness rate: Use a microscope to magnify and observe the sample, record the number of end hairiness, loops, and hair clips, and calculate the hairiness rate of the glass fiber sample;

[0089] Finished Product Rate: Visually inspect and select glass fiber yarns with uniform yarn diameter, smooth surface, and no obvious defects or impurities as finished products. Record the number of yarns and calculate the finished product rate of the glass fiber sample. The test results are shown in Table 1.

[0090] Table 1 Performance data of each group of samples

[0091] Group Tensile displacement / mm Migration amount / % 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

[0092] As shown in Table 1, combined with the data of Examples 1 and 4-6, hydroxypropyl starch, oxidized starch and acid-treated starch are selected as composite modified starches. The three can synergistically play a stabilizing role in the wetting agent, thereby improving the binding force and stability of the wetting agent and the fiber.

[0093] Combining the data of Example 1 and Comparative Example 1, it can be seen that in the preparation process of the wetting agent of the present invention, the composite modified starch adopts two cross-linking steps of first low-temperature cross-linking and then high-temperature gelatinization, so that the molecular chains inside and outside the starch granules are fully cross-linked, which not only improves the stability and film-forming properties of the film-forming agent, but also enhances the adhesion to the fiber, thereby improving the performance of glass fiber products.

[0094] Combining the data of Example 1 and Comparative Examples 2-5, it can be seen that the use of tea polyphenols, lactic acid and carboxymethyl tamarind gum as anti-aging agents can synergistically improve the anti-aging properties of the impregnating agent, thereby effectively improving the tensile properties of the fiber products, making the fiber smoother during processing, and reducing the occurrence of breakage, flying threads and the like.

[0095] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit the scope of protection of the present invention. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents 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, 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, wherein: In 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%; and 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, wherein: 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, wherein: 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, wherein: 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, wherein: The auxiliary agents include lubricant, emulsifier, preservative and defoaming agent. 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 defoaming agent 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, wherein: 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 parahydroxybenzoate; (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 highly stable starch-based wetting agent according to 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.