A starch-based sizing agent, its preparation method and application

Abstract

The present invention relates to a starch-based sizing agent, a preparation method thereof and an application. The sizing agent comprises an active ingredient and water. The active ingredient comprises raw materials in the following parts by weight: 45-65 parts of a starch-based film-forming agent, 5-10 parts of a plasticizer, 15-20 parts of a lubricant, 1-2.5 parts of an emulsifier, 5-8 parts of a coupling agent, 1-2.5 parts of a softener, 0.5-1.5 parts of a preservative and 0.02-0.05 parts of an antifoaming agent; wherein, the starch-based film-forming agent is a composition of potato oxidized hydroxypropyl starch, octenyl succinic anhydride starch ester and modified starch with a mass ratio of 1:(1.1-1.5):(0.5-0.8); the lubricant is a composition of carnauba wax and hydrogenated soybean oil. The sizing agent of the present invention can effectively improve the abrasion resistance of low-twist yarns, reduce hairiness, enhance bundling property and weaving performance, and can be used for preparing fine glass fiber spun yarns.

Description

Technical Field

[0001] The present invention relates to the technical field of glass fiber surface treatment agents, and specifically relates to a starch-based sizing agent, its preparation method and application. Background Art

[0002] Glass fibers and their products belong to new inorganic non-metallic materials and are a new material sub-industry that the country strongly encourages to develop. Electronic yarn is glass fiber with a single filament diameter of 9 microns or less. Compared with other glass fiber varieties, it has higher requirements for production technology and processes. It overcomes the brittleness of the glass fiber material itself and has advantages such as high strength, light weight, and good electrical properties, and can be applied to high-end fields such as the electronics industry. The large-scale application of electronic yarn and electronic cloth as base materials in the copper clad laminate industry has solved problems such as easy short-circuit and open-circuit of PCBs, and is a key raw material affecting the performance of copper clad laminates and PCBs, thus playing a fundamental role in the innovative development of the entire electronics industry.

[0003] The application requirements of electronic-grade glass fiber cloth products in the copper clad laminate and printed circuit board industries are becoming increasingly strict, especially in terms of fabric surface defect points, dimensional stability, thickness, and fabric surface air permeability. Although the commonly used high-twist weaving and high-pressure fiber opening processes in the industry can meet the requirements to a certain extent, there are still some problems. For example, the high-pressure fiber opening method is likely to cause problems such as broken filaments and weft skew on the fabric surface, which have an adverse impact on subsequent use, such as poor wetting and dimensional deviation during downstream sizing, resulting in poor use effects. Therefore, there is a certain limit to using the high-pressure fiber opening method. Weaving with low-twist yarns does not require high-pressure fiber opening, and low air permeability and flat fabric surface properties can be obtained only by normal-pressure or low-pressure spraying. However, at the same time, it has disadvantages such as poor wear resistance, many hairiness, poor bundling property and weaving performance. This poses higher requirements for the sizing agent as its surface treatment agent, and the sizing agent is required to improve the wear resistance of low-twist yarns, reduce hairiness, and improve the bundling property and weaving performance. Summary of the Invention

[0004] The purpose of the present invention is to overcome the deficiencies of the prior art and provide a starch-based sizing agent, its preparation method and application that can effectively improve the wear resistance of low-twist yarns, reduce hairiness, enhance the bundling property and weaving performance.

[0005] To achieve the above purpose, the technical solution adopted by the present invention is as follows:

[0006] In a first aspect, the present invention provides a starch-based sizing agent, which includes an active ingredient and water. The mass ratio of the active ingredient to water is (0.05 - 0.15):1. The active ingredient includes the following raw materials in parts by weight: 45 - 65 parts of a starch-based film-forming agent, 5 - 10 parts of a plasticizer, 15 - 20 parts of a lubricant, 1 - 2.5 parts of an emulsifier, 5 - 8 parts of a coupling agent, 1 - 2.5 parts of a softener, 0.5 - 1.5 parts of a preservative, and 0.02 - 0.05 parts of an antifoaming agent; wherein, the starch-based film-forming agent is a composition of oxidized hydroxypropyl starch of potato, starch octenyl succinate, and modified starch with a mass ratio of 1:(1.1 - 1.5):(0.5 - 0.8). The manufacturer of the modified starch is Guangdong Huimei Starch Technology Co., Ltd., and the grade is HM-318; the plasticizer is tributyl citrate; the lubricant is a composition of carnauba wax and hydrogenated soybean oil.

[0007] Because the inherent polyhydroxy structure of starch endows the film-forming agent with strong hydrophilicity, resulting in poor water resistance. Therefore, to overcome this shortcoming, the present invention selects carnauba wax and hydrogenated soybean oil as lubricants and hydrophobic agents. The higher fatty alcohols and long-chain alkanes in carnauba wax and the saturated fatty acids contained in hydrogenated soybean oil can improve the oxidation stability and lubricating performance of the sizing agent, effectively enhancing the binding force between the film-forming agent and the lubricant, making the sizing agent film have excellent flexibility and lubricity. Moreover, due to the presence of carnauba wax, it forms a hard dispersed phase, which is beneficial to improving the abrasion resistance of low-twist yarns. The addition of hydrogenated soybean oil can improve the fluidity of carnauba wax and reduce its viscosity, thereby improving the lubricity and bundling property of the yarn. Therefore, the combination of carnauba wax and hydrogenated soybean oil is more conducive to reducing the water resistance of the starch film and improving the abrasion resistance of the starch film.

[0008] Oxidized hydroxypropyl starch (OHS), modified starch, and starch octenyl succinate can form a film-forming polymer network. Moreover, the amphiphilic starch octenyl succinate can stabilize carnauba wax, making the starch-based film-forming agent have good compatibility with carnauba wax. The synergistic effect of the three components enables the film-forming agent to form a firm, clear, and continuous film subsequently, thereby endowing the yarn with stiffness and improving the bundling property of the yarn. At the same time, because starch octenyl succinate has low viscosity performance, it can also reduce the viscosity, thereby improving the stability and fluidity of the sizing agent.

[0009] Preferably, the emulsifier is fatty acid polyoxyethylene ester, which further emulsifies the lubricant to improve its compatibility in the system.

[0010] Preferably, the coupling agent is a silane coupling agent. The coupling agent can play a bridging role between organic and inorganic substances, thereby further improving the bonding property between glass fiber and film-forming agent, and reducing the waste of sizing agent during the forming process of roving. The silane coupling agent can effectively maintain the bonding strength between glass fiber and sizing agent after roving conditioning, and reduce the hairiness rate of cheese yarn.

[0011] Preferably, the softening agent is aliphatic polyamide and / or ester quaternary ammonium salt. The softening agent has good compatibility with other components of the sizing agent, can effectively improve the softness of yarn, and make it more suitable for weaving.

[0012] Preferably, the preservative is sodium methyl p-hydroxybenzoate.

[0013] Preferably, the defoaming agent is a phosphate defoaming agent.

[0014] Preferably, the starch-based film-forming agent is a composition of oxidized hydroxypropyl starch of potato, starch ester of octenyl succinic acid, and modified starch with a mass ratio of 1:1.2:0.7.

[0015] Preferably, the lubricant is a composition of carnauba wax and hydrogenated soybean oil with a mass ratio of (1.2 - 1.5):1. More preferably, the lubricant is a composition of carnauba wax and hydrogenated soybean oil with a mass ratio of 1.3:1.

[0016] In the second aspect, the present invention provides a preparation method of the starch-based sizing agent, including the following steps:

[0017] S1. Mix the starch-based film-forming agent in a formulated amount with water, stir evenly, heat and keep warm, and then cool to obtain a film-forming agent solution;

[0018] S2. Mix the plasticizer, lubricant, emulsifier, coupling agent, softening agent, preservative, and defoaming agent in formulated amounts, stir evenly to obtain an auxiliary agent solution;

[0019] S3. Mix the film-forming agent solution with the auxiliary agent solution, stir until an emulsion is formed to obtain the starch-based sizing agent.

[0020] Preferably, the stirring speed in step S1 is 200 - 300 rpm, the stirring time is 10 - 20 min, the heat preservation temperature is 90 - 100 °C, and the heat preservation time is 20 - 40 min.

[0021] Preferably, the stirring temperature in step S2 is 60 - 70 °C, the stirring speed is 300 - 500 rpm, and the stirring time is 20 - 40 min.

[0022] In the third aspect, the present invention provides an application of the starch-based sizing agent in the preparation of fine glass fiber textile yarns.

[0023] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0024] The present invention selects a composition of carnauba wax and hydrogenated soybean oil as the lubricant of the starch-based sizing agent. While providing lubrication effect, it can also improve the hydrophobicity of the sizing agent and the abrasion resistance of the yarn. The starch-based film-forming agent in the present invention is a composition of oxidized hydroxypropyl potato starch, starch octenyl succinate and modified starch with a mass ratio of 1:(1.1 - 1.5):(0.5 - 0.8). These three components have a synergistic effect, enabling the film-forming agent to form a firm, clear and continuous film subsequently, thereby endowing the yarn with stiffness and improving the bundling property of the yarn. Since the starch-based sizing agent of the present invention can effectively improve the abrasion resistance of low-twist yarns, reduce hairiness, enhance the bundling property and weaving performance, it can be used to prepare fine glass fiber textile yarns. Detailed Embodiments

[0025] 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.

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

[0027] Oxidized hydroxypropyl potato starch: The manufacturer is Gansu Fengshou Agricultural Science and Technology Co., Ltd., and the product number is FS9170;

[0028] Starch octenyl succinate: Hubei Chang'ao Pharmaceutical Co., Ltd.;

[0029] Modified starch: The manufacturer is Guangdong Huimei Starch Technology Co., Ltd., and the product number is HM-318;

[0030] Tributyl citrate: The manufacturer is Guangdong Wengjiang Chemical Reagent Co., Ltd., and the product number is PB06267;

[0031] Carnauba wax: The manufacturer is Shanghai Macklin Biochemical Co., Ltd., and the product number is C804522, melting point > 83 °C, light yellow;

[0032] Hydrogenated soybean oil: The manufacturer is Guangdong Wengjiang Chemical Reagent Co., Ltd., and the product number is PA97037;

[0033] Palm oil: The manufacturer is Guangdong Wengjiang Chemical Reagent Co., Ltd., and the product number is DB96782;

[0034] Emulsifier: Fatty acid polyoxyethylene ester, the manufacturer is Jiangsu Haian Petrochemical Factory, and the model is A-103;

[0035] Coupling agent: Silane coupling agent KH-602, the manufacturer is Guangdong Wengjiang Chemical Reagent Co., Ltd., and the model is PB990698;

[0036] Aliphatic polyamide: The manufacturer is Lubrizol, the model is Aptalon™ 9500;

[0037] Ester quaternary ammonium salt: disalmitate carboxyethyl hydroxyethyl methyl sulfate ammonium salt, manufacturer is Jingzhou Yinjie Chemical Co., Ltd., model number is TEP-75;

[0038] Preservative: Sodium methyl parahydroxybenzoate, manufactured by Guangdong Wengjiang Chemical Reagent Co., Ltd., brand PA59051;

[0039] Defoaming agent: phosphate defoaming agent, manufactured by Guangzhou Oupeng Chemical Co., Ltd., model number MOUSSEX ® 941PL.

[0040] Unless otherwise specified, other materials, reagents, etc. used in the Examples and Comparative Examples can be obtained from commercial sources.

[0041] Example 1

[0042] A starch-based wetting agent comprises an active ingredient and water, wherein the mass ratio of the active ingredient to water is 0.1:1, and the active ingredient is composed of the following raw materials in parts by weight: 55 parts of a starch-based film-forming agent, 6 parts of a plasticizer, 16 parts of a lubricant, 2 parts of an emulsifier, 7 parts of a coupling agent, 1.5 parts of a softener, 1.3 parts of a preservative, and 0.03 parts of a defoaming agent; wherein the starch-based film-forming agent is a composition of potato oxidized hydroxypropyl starch, octenyl succinate starch, and modified starch in a mass ratio of 1:1.2:0.7; the plasticizer is tributyl citrate; the lubricant is a composition of carnauba wax and hydrogenated soybean oil in a mass ratio of 1.3:1; the emulsifier is fatty acid polyoxyethylene ester; the coupling agent is a silane coupling agent; the softener is an aliphatic polyamide; the preservative is sodium methyl parahydroxybenzoate; and the defoaming agent is a phosphate defoaming agent.

[0043] The preparation method of the starch-type wetting agent comprises the following steps:

[0044] S1. Mix the formulated amount of starch-based film-forming agent with water, stir at 250 rpm for 15 minutes, heat to 95° C., keep warm for 30 minutes, and cool to obtain a film-forming agent solution;

[0045] S2. Mix the formulated amount of plasticizer, lubricant, emulsifier, coupling agent, softener, preservative and defoamer, and stir evenly to obtain an additive solution;

[0046] S3. Mix the film-forming agent solution and the auxiliary agent solution, and stir at 400 rpm at 65° C. for 30 min to form an emulsion to obtain the starch-based wetting agent.

[0047] Example 2

[0048] A starch-based sizing agent, the sizing agent comprising an active ingredient and water, the mass ratio of the active ingredient to water being 0.15:1, the active ingredient being composed of the following raw materials in parts by weight: 45 parts of a starch-based film-forming agent, 5 parts of a plasticizer, 15 parts of a lubricant, 1 part of an emulsifier, 5 parts of a coupling agent, 1 part of a softener, 0.5 part of a preservative, and 0.02 part of an antifoaming agent; wherein, the starch-based film-forming agent is a composition of oxidized hydroxypropyl potato starch, starch octenyl succinate, and modified starch with a mass ratio of 1:1.1:0.5; the plasticizer is tributyl citrate; the lubricant is a composition of carnauba wax and hydrogenated soybean oil with a mass ratio of 1.5:1; the emulsifier is fatty acid polyoxyethylene ester; the coupling agent is a silane coupling agent; the softener is ester quaternary ammonium salt; the preservative is sodium methyl p-hydroxybenzoate, and the antifoaming agent is a phosphate antifoaming agent.

[0049] A preparation method of a starch-based sizing agent, comprising the following steps:

[0050] S1. Mix the formulated amount of the starch-based film-forming agent with water, stir at 200 rpm for 10 min, heat to 90 °C and keep warm for 40 min, and after cooling, obtain a film-forming agent solution;

[0051] S2. Mix the formulated amounts of the plasticizer, lubricant, emulsifier, coupling agent, softener, preservative, and antifoaming agent, and stir evenly to obtain an auxiliary agent solution;

[0052] S3. Mix the film-forming agent solution and the auxiliary agent solution, stir at 300 rpm at 60 °C for 40 min to form an emulsion, and obtain the starch-based sizing agent.

[0053] Example 3

[0054] A starch-based sizing agent, the sizing agent comprising an active ingredient and water, the mass ratio of the active ingredient to water being 0.05:1, the active ingredient being composed of the following raw materials in parts by weight: 65 parts of a starch-based film-forming agent, 10 parts of a plasticizer, 20 parts of a lubricant, 2.5 parts of an emulsifier, 8 parts of a coupling agent, 2.5 parts of a softener, 1.5 part of a preservative, and 0.05 part of an antifoaming agent; wherein, the starch-based film-forming agent is a composition of oxidized hydroxypropyl potato starch, starch octenyl succinate, and modified starch with a mass ratio of 1:1.5:0.8; the plasticizer is tributyl citrate; the emulsifier is fatty acid polyoxyethylene ester; the coupling agent is a silane coupling agent; the softener is a composition of aliphatic polyamide and ester quaternary ammonium salt with a mass ratio of 1:1; the preservative is sodium methyl p-hydroxybenzoate; the antifoaming agent is a phosphate antifoaming agent.

[0055] A preparation method of a starch-based sizing agent, comprising the following steps:

[0056] S1. Mix the starch in the formula amount with water, stir at 300 rpm for 20 min, heat to 100 °C and then keep heating for 20 min. After cooling, obtain the gelatinized starch solution;

[0057] S2. Mix the plasticizer, lubricant, emulsifier, coupling agent, softener, preservative and defoamer in the formula amount, and stir evenly to obtain the auxiliary agent solution;

[0058] S3. Mix the film-forming agent solution with the auxiliary agent solution, stir at 500 rpm at 70 °C for 20 min to form an emulsion, and obtain the starch-based sizing agent.

[0059] Example 4

[0060] The difference between Example 4 and Example 1 is that the lubricant is a composition of carnauba wax and hydrogenated soybean oil with a mass ratio of 1:1.

[0061] Example 5

[0062] The difference between Example 5 and Example 1 is that the lubricant is a composition of carnauba wax and hydrogenated soybean oil with a mass ratio of 1:1.6.

[0063] Comparative Example 1

[0064] The difference between Comparative Example 1 and Example 1 is that the starch-based film-forming agent in Comparative Example 1 is an equal amount of potato starch.

[0065] Comparative Example 2

[0066] The difference between Comparative Example 2 and Example 1 is that hydroxypropyl oxidized potato starch is not added to the starch-based film-forming agent, and octenyl succinic anhydride starch ester and modified starch with a mass ratio of 1.2:0.7 are used as the starch-based film-forming agent.

[0067] Comparative Example 3

[0068] The difference between Comparative Example 3 and Example 1 is that octenyl succinic anhydride starch ester is not added to the starch-based film-forming agent, and hydroxypropyl oxidized potato starch and modified starch with a mass ratio of 1:0.7 are used as the starch-based film-forming agent.

[0069] Comparative Example 4

[0070] The difference between Comparative Example 4 and Example 1 is that modified starch is not added to the starch-based film-forming agent, and hydroxypropyl oxidized potato starch and octenyl succinic anhydride starch ester with a mass ratio of 1:1.2 are used as the starch-based film-forming agent.

[0071] Comparative Example 5

[0072] The difference between Comparative Example 5 and Example 1 lies in that: the total amount of the starch-based film-forming agent remains unchanged, and the starch-based film-forming agent is a composition of oxidized hydroxypropyl potato starch, starch octenyl succinate, and modified starch with a mass ratio of 1:0.7:1.2.

[0073] Comparative Example 6

[0074] The difference between Comparative Example 6 and Example 1 lies in that: the total amount of the starch-based film-forming agent remains unchanged, and the starch-based film-forming agent is a composition of oxidized hydroxypropyl potato starch, starch octenyl succinate, and modified starch with a mass ratio of 0.7:1.2:1.

[0075] Comparative Example 7

[0076] The difference between Comparative Example 7 and Example 1 lies in that: the total amount of the starch-based film-forming agent remains unchanged, and the starch-based film-forming agent is a composition of oxidized hydroxypropyl potato starch, starch octenyl succinate, and modified starch with a mass ratio of 1.2:1:0.7.

[0077] Comparative Example 8

[0078] The difference between Comparative Example 8 and Example 1 lies in that: carnauba wax is replaced with palm oil.

[0079] Performance Test

[0080] 1. Film Strength Test

[0081] The film strength of the sizing agents of Examples 1-5 and Comparative Examples 1-8 was detected using a bursting strength tester, and the specific data are shown in Table 1.

[0082] The sizing agents of Examples 1-5 and Comparative Examples 1-8 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 respectively carried out on the glass fiber samples.

[0083] 2. Water Resistance Test

[0084] 10-cm glass fiber samples prepared from the sizing agents of Examples 1-5 and Comparative Examples 1-8 were respectively taken and immersed in pure aqueous solution at 25°C for 6 h, and their mass loss rates were measured. The results are shown in Table 1.

[0085] 3. Product Performance Test

[0086] The glass fiber samples prepared from the sizing agents of Examples 1-5 and Comparative Examples 1-8 were respectively taken for tests of migration amount, broken wire rate, hairiness rate, and finished product rate. The specific test methods are as follows:

[0087] Migration amount: The migration amount of the glass fiber sample was tested according to the method of GB31604.8—2021;

[0088] Broken filament rate: The sample was magnified and observed using a microscope, the number of partially broken and completely broken filaments was recorded, and the broken filament rate of the glass fiber sample was calculated;

[0089] Hairiness rate: The sample was magnified and observed using a microscope, the number of end hairiness, loops, and hair clips was recorded, and the hairiness rate of the glass fiber sample was calculated;

[0090] Qualified rate: Glass fiber yarns with uniform yarn diameter and smooth surface, without obvious defects and impurities, were visually selected as qualified products, their number was recorded, and the qualified rate of the glass fiber sample was calculated.

[0091] The test results are shown in Table 2.

[0092] Table 1 Test results of sizing film strength and water resistance

[0093] Group / Performance Film Strength KPa Mass Loss Rate / % Example 1 226 0.43 Example 2 224 0.46 Example 3 220 0.50 Example 4 212 0.53 Example 5 215 0.51 Comparative Example 1 144 0.80 Comparative Example 2 162 0.62 Comparative Example 3 169 0.61 Comparative Example 4 160 0.65 Comparative Example 5 182 0.58 Comparative Example 6 186 0.60 Comparative Example 7 183 0.55 Comparative Example 8 191 1.72

[0094] Table 2 Product performance results of glass fiber samples

[0095] Group / Performance Migration Amount / % Wire Breakage Rate / % Hairiness Rate / % Finished Product Rate / % Example 1 1.70 0.39 0.51 96.8 Example 2 1.74 0.42 0.53 96.4 Example 3 1.77 0.45 0.55 96.1 Example 4 1.86 0.53 0.61 93.5 Example 5 1.91 0.56 0.65 93.0 Comparative Example 1 12.32 4.17 8.02 75.3 Comparative Example 2 6.64 1.57 3.53 82.0 Comparative Example 3 7.25 1.83 4.36 81.3 Comparative Example 4 6.72 1.64 4.29 81.4 Comparative Example 5 3.29 0.93 1.68 86.6 Comparative Example 6 3.20 0.88 1.61 87.3 Comparative Example 7 3.23 0.90 1.65 86.9 Comparative Example 8 2.24 0.74 1.26 90.7

[0096] From the results of Examples 1-5 in Tables 1-2, it can be seen that when the mass ratio of carnauba wax and hydrogenated soybean oil in the lubricant is within the range of (1.2-1.5):1, the film strength and water resistance of the sizing agent and the performance of the made glass fiber yarn reach a better level.

[0097] From the results of Example 1 and Comparative Examples 1-4 in Tables 1-2, it can be seen that the three components of oxidized hydroxypropyl starch, octenyl succinate starch ester, and modified starch can synergistically improve the bonding strength between the sizing agent and glass fiber, can coat and bond the glass fiber rovings, endow the yarn with stiffness, improve the bundling property of the yarn, and reduce the hairiness during unwinding and weaving and the powder dropping. This may be because the presence of octenyl succinate starch ester makes the starch-based film-forming agent have good dispersibility in carnauba wax, further improving the stability and fluidity of the sizing agent.

[0098] As can be seen from the results of Example 1 and Comparative Examples 5-7 in Table 1-2, the addition amount of octenyl succinic anhydride starch ester affects the performance of the film-forming agent. Since octenyl succinic anhydride starch ester affects the viscosity of the system, it may affect the fluidity of the sizing agent, thereby affecting the mechanical properties of the film formation. When the mass ratio of the oxidized hydroxypropyl starch of potato, octenyl succinic anhydride starch ester and modified starch is within the range of 1:(1.1-1.5):(0.5-0.8), the film-forming strength, water resistance of the sizing agent and the product performance of the glass fiber sample can achieve better effects.

[0099] As can be seen from the results of Example 1 and Comparative Example 8 in Table 1-2, carnauba wax is better than palm oil in improving the hydrophobicity and wear resistance of the sizing agent, and the combination of carnauba wax and hydrogenated soybean oil is more conducive to reducing the water resistance of the starch film and improving the wear resistance of the starch film.

[0100] In summary, the sizing agent of the present invention can effectively improve the wear resistance of low-twist yarns, reduce hairiness, enhance the bundling property and weaving performance, and can be used for preparing fine glass fiber yarns.

[0101] 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 starch-type wetting agent, characterized in that The wetting agent includes active ingredients and water, and the mass ratio of active ingredients to water is (0.05-0.15):

1. The active ingredients include the following raw materials in parts by weight: 45-65 parts of starch-based film-forming agent, 5-10 parts of plasticizer, 15-20 parts of lubricant, 1-2.5 parts of emulsifier, 5-8 parts of coupling agent, 1-2.5 parts of softener, 0.5-1.5 parts of preservative and 0.02-0.05 parts of defoaming agent; The starch-based film-forming agent is a composition of potato oxidized hydroxypropyl starch, octenyl succinate starch ester and modified starch in a mass ratio of 1:1.2:0.

7. The modified starch is manufactured by Guangdong Huimei Starch Technology Co., Ltd. and is branded HM-318. The plasticizer is tributyl citrate. The lubricant is a composition of carnauba wax and hydrogenated soybean oil in a mass ratio of 1.3:

1. The emulsifier is fatty acid polyoxyethylene ester. The preparation method of the starch-type wetting agent comprises the following steps: S1. Mixing a formulated amount of a starch-based film-forming agent with water, stirring evenly, heating and keeping warm, and cooling to obtain a film-forming agent solution; S2. Mix the formulated amount of plasticizer, lubricant, emulsifier, coupling agent, softener, preservative and defoamer, and stir evenly to obtain an additive solution; S3. Mixing the film-forming agent solution and the auxiliary agent solution, stirring until an emulsion is formed, to obtain the starch-based wetting agent.

2. The starch-based wetting agent according to claim 1, wherein The coupling agent is a silane coupling agent, the softener is aliphatic polyamide and / or ester-based quaternary ammonium salt, the preservative is sodium methyl parahydroxybenzoate, and the defoaming agent is a phosphate defoaming agent.

3. The method for preparing the starch-type wetting agent according to claim 1 or 2, characterized in that: The following steps are involved: S1. Mixing a formulated amount of a starch-based film-forming agent with water, stirring evenly, heating and keeping warm, and cooling to obtain a film-forming agent solution; S2. Mix the formulated amount of plasticizer, lubricant, emulsifier, coupling agent, softener, preservative and defoamer, and stir evenly to obtain an additive solution; S3. Mixing the film-forming agent solution and the auxiliary agent solution, stirring until an emulsion is formed, to obtain the starch-based wetting agent.

4. The method for preparing a starch-based wetting agent according to claim 3, wherein In step S1, the stirring speed is 200-300 rpm, the stirring time is 10-20 min, the insulation temperature is 90-100° C., and the insulation time is 20-40 min.

5. The method for preparing the starch-type wetting agent according to claim 3, wherein The stirring temperature in step S2 is 60-70° C., the stirring speed is 300-500 rpm, and the stirring time is 20-40 min.

6. Use of the starch-based sizing agent according to claim 1 or 2 in the preparation of glass fiber textile yarn.