Low-temperature starch type impregnating compound as well as preparation method and application thereof

Abstract

The invention relates to a low-temperature starch type impregnating compound as well as a preparation method and application thereof. The low-temperature starch type impregnating compound is prepared from the following raw materials in percentage by mass: 4-8% of a low-temperature starch type film-forming agent; 0.2%-1.0% of a plasticizer; 0.5%-2.5% of a lubricant; 0.05%-0.25% of an emulsifying agent; 0.04 to 0.08% of a coupling agent; 0.5 to 1.0 percent of a cross-linking agent; and the balance of water. Wherein the low-temperature starch type film-forming agent is a composition of distarch hydroxypropyl phosphate, oxidized starch and modified starch in a mass ratio of 1: 1: (1.2-1.5), and the emulsifier is a composition of isohexylene glycol and polyethylene glycol. The impregnating compound disclosed by the invention can be uniformly distributed in glass fiber yarns, so that waste is reduced, the utilization rate is increased, the bundling property, the flexibility and the lubricity of electronic yarns are enhanced, and the subsequent processing and using performance is optimized.

Description

Technical Field

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

[0002] Glass fiber electronic yarn, as a product made from glass melt through drawing and twisting processes, needs to be coated with a wetting agent to give it the necessary performance after cooling due to its brittleness and easy to break. Among them, starch-type wetting agents, especially textile-type wetting agents with starch as the main film-forming agent, have become the preferred wetting agent type in the electronic yarn industry because they can significantly improve the bundling, flexibility and lubricity of the yarn, and have a direct impact on the performance of subsequent electronic cloth products. Starch is divided into two categories: high-temperature starch and low-temperature starch according to the different cooking temperatures. The latter can be used below 100°C.

[0003] Although low-temperature starch impregnating agents are widely favored for their non-toxic, non-irritating, easy to clean, low decomposition temperature and other characteristics, and the treated glass fiber cloth shows a white and smooth appearance, it has a significant effect on protecting the glass fiber bundling, and produces less hair during the debonding and weaving process. At the same time, domestic research has also shown that it can produce glass fibers with good bundling, moderate yarn stiffness, and stable flying properties, and can reduce the air permeability of the grey cloth and save production costs. Some impregnating agents have excellent film-forming properties, which can effectively reduce the hairiness of glass fibers, anti-static, and enhance the tensile properties of glass fibers.

[0004] However, in production practice, low-temperature starch sizing agents have also exposed shortcomings that cannot be ignored. Specifically, their operating rate and sizing agent utilization rate are relatively low, which not only affects production efficiency, but also increases production costs. More importantly, the A-grade rate of glass fiber products produced using low-temperature starch sizing agents is also low, which directly affects the market competitiveness of the products. Therefore, it is particularly urgent to develop a new sizing agent to address these problems of low-temperature starch sizing agents. Summary of the invention

[0005] The purpose of the present invention is to overcome the shortcomings of the prior art and provide a low-temperature starch-type wetting agent and a preparation method and application thereof. This new type of wetting agent significantly improves the start-up rate and wetting agent utilization rate during the coating preparation process, while improving the A-grade rate of the product weaving shaft, so as to better meet production and market needs and promote the sustainable development of the glass fiber electronic yarn industry.

[0006] To achieve the above object, the technical solution adopted by the present invention is: In a first aspect, the present invention provides a low-temperature starch-based wetting agent, which is composed of the following raw materials in percentage by mass: Low temperature starch film-forming agent: 4-8%; Plasticizer: 0.2-1.0%; Lubricant: 0.5-2.5%; Emulsifier: 0.05-0.25%; Coupling agent: 0.04-0.08%; Cross-linking agent: 0.5-1.0%; The balance is water; Among them, the low-temperature starch-type film-forming agent is a composition of hydroxypropyl distarch phosphate, oxidized starch and modified starch in a mass ratio of 1:1:(1.2-1.5), the manufacturer of the oxidized starch is Foshan Nanhai Huahao Huafeng Starch Co., Ltd.; the manufacturer of the modified starch is Guangdong Huimei Starch Technology Co., Ltd., with a brand name of HM-M215; the emulsifier is a composition of isohexanediol and polyethylene glycol.

[0007] In the presence of a cross-linking agent, hydroxypropyl distarch phosphate, oxidized starch, and modified starch undergo a cross-linking reaction, which forms cross-linked bonds between starch molecules, thereby enhancing the network structure of starch granules, which helps to improve the stability and mechanical strength of the starch film, but may also lead to a decrease in the overall fluidity of the starch. Isohexanediol and polyethylene glycol can form hydrogen bonds with starch molecules, increase the flexibility of starch chains, reduce friction and resistance between molecules, and thus improve the fluidity of the impregnant. Isohexanediol and polyethylene glycol can also synergistically reduce the surface tension of the impregnant. The reduction in surface tension helps the impregnant to better wet the fiber surface and form a more uniform coating, thereby improving wettability. Enhanced wettability means that the impregnant can be more evenly distributed on the yarn surface, reducing waste and loss, thereby improving the utilization rate of the impregnant, and at the same time helping to improve the bundling, flexibility, and lubricity of the electronic yarn, so that the electronic yarn performs better in subsequent processing and use.

[0008] Preferably, the mass ratio of isohexylene glycol to polyethylene glycol is 1:(1.5-2), and the number average molecular weight of polyethylene glycol is 300-600.

[0009] Preferably, the cross-linking agent is sodium trimetaphosphate and / or calcium chloride. More preferably, the cross-linking agent is a composition of sodium trimetaphosphate and calcium chloride in a mass ratio of 1: (0.5-1.2), wherein the calcium ions in the calcium chloride are linked to the starch polymer chains to form a three-dimensional structure, which enhances the mechanical properties and moisture barrier properties of the starch film, and when sodium trimetaphosphate reacts with starch, the phosphate groups and the hydroxyl groups in the starch molecules can form phosphate bonds, and the sodium ions and the hydroxyl groups in the starch undergo ionic bonding, thereby forming a stable spatial network structure, which improves the elasticity and stability of the starch film.

[0010] Preferably, the lubricant is at least one of oleic acid, stearic acid and fatty acid amide.

[0011] Preferably, the coupling agent is at least one of an epoxy silane coupling agent, a vinyl silane coupling agent and an amino silane coupling agent.

[0012] Preferably, the plasticizer is tributyl citrate.

[0013] In a second aspect, the present invention provides a method for preparing the low-temperature starch-type wetting agent in the first aspect, comprising the following steps: S1, mixing an emulsifier, a lubricant and 10-20% of the total mass of water, emulsifying and homogenizing to obtain a lubricant emulsion; S2, adding 20-30% of the total mass of water to the low-temperature starch film-forming agent, stirring and dispersing, heating to 85-95°C, keeping the temperature for a period of time, and then cooling to 60-70°C to obtain starch gelatinized liquid; S3, adding a cross-linking agent, a coupling agent, a plasticizer, a lubricant emulsion and the remaining water to the starch gelatinized liquid in sequence, stirring evenly, to obtain the low-temperature starch type wetting agent.

[0014] Preferably, in step S2, the insulation time is 30-40 minutes.

[0015] Preferably, the stirring temperature in step S3 is 60-70° C., the stirring speed is 300-500 rpm, and the stirring time is 20-40 min.

[0016] In a third aspect, the present invention provides use of the low-temperature starch-type wetting agent described in the first aspect in the preparation of glass fiber electronic yarn.

[0017] Compared with the prior art, the present invention has the following beneficial effects: (1) The low-temperature starch-type film-forming agent of the present invention is a composition of hydroxypropyl distarch phosphate, oxidized starch and modified starch, which can synergistically improve the stability and mechanical strength of the starch film, so that the film-forming agent can subsequently form a firm, clear and continuous film, thereby giving the yarn stiffness and improving the yarn's bundling; the emulsifier of the present invention is a composition of isohexanediol and polyethylene glycol, both of which can form hydrogen bonds with the starch film-forming agent, thereby increasing the flexibility of the starch film and improving the fluidity of the wetting agent. At the same time, isohexanediol and polyethylene glycol can also synergistically reduce the surface tension of the wetting agent, promote the wetting of the fiber by the wetting agent, form a uniform coating, and improve the wettability. The selection of the low-temperature starch-type film-forming agent and emulsifier of the present invention helps to evenly distribute the wetting agent, reduce waste, improve utilization, and enhance the bundling, flexibility and lubricity of the electronic yarn, optimizing subsequent processing and use performance.

[0018] (2) In the preparation method of the low-temperature starch-type wetting agent of the present invention, the starch-type film-forming agent is firstly gelatinized at a temperature not exceeding 100°C, and then cross-linked with a cross-linking agent, that is, a total of two cross-linking reactions are carried out. The low-temperature starch-type film-forming agent after the secondary cross-linking can be more evenly covered on the surface of the glass fiber yarn to form a protective film, which 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 strength, toughness, processing performance, wear resistance and weather resistance of the glass fiber yarn. DETAILED DESCRIPTION

[0019] 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.

[0020] Unless otherwise specified, other materials, reagents, etc. used in the examples and comparative examples can be obtained from commercial sources. The sources of the materials used in the following examples and comparative examples are as follows: Hydroxypropyl distarch phosphate (hydroxypropyl distarch phosphate): the manufacturer is Foshan Nanhai Huahao Huafeng Starch Co., Ltd.; Oxidized starch: the manufacturer is Foshan Nanhai Huahao Huafeng Starch Co., Ltd.; Modified starch: the manufacturer is Guangdong Huimei Starch Technology Co., Ltd., the brand is HM-M215; Potato starch: manufacturer is Shenzhen Tuojian Biotechnology Co., Ltd. Isohexanediol: manufacturer is Guangdong Wengjiang Chemical Reagent Co., Ltd., model number is PB02788; Polyethylene glycol 300: The manufacturer is Shanghai Bangao Chemical Co., Ltd., the model is PEG-300, the hydroxyl value is 270-330 mgKOH / g, and the number average molecular weight is 270-330; Polyethylene glycol 400: The manufacturer is Shanghai Bangao Chemical Co., Ltd., the model is PEG-400, the hydroxyl value is 255-321 mgKOH / g, and the molecular weight is 360-440; Polyethylene glycol 600: The manufacturer is Shanghai Bangao Chemical Co., Ltd., the model is PEG-600, the hydroxyl value is 170-208 mgKOH / g, and the molecular weight is 540-660; Sodium trimetaphosphate: manufacturer is Guangdong Wengjiang Chemical Reagent Co., Ltd., model number is PA00224; Calcium chloride: manufacturer is Guangdong Wengjiang Chemical Reagent Co., Ltd., model number is PA017253; Tributyl citrate: Manufacturer: Guangdong Wengjiang Chemical Reagent Co., Ltd., model number: PB06267 Epoxy silane coupling agent: manufacturer is Dow Corning, model number is Z-6044; Vinyl silane coupling agent: vinyl triethoxysilane, manufactured by Guangzhou Kailvwei Chemical Co., Ltd., model A-151; Aminosilane coupling agent: γ-aminopropyltriethoxysilane, manufactured by Guangzhou Zhongjie Chemical Technology Co., Ltd., model KH-550; Oleic acid: manufacturer is Shanghai Yien Chemical Technology Co., Ltd., model number is R002007; Stearic acid: manufacturer is Shanghai Yien Chemical Technology Co., Ltd., model number is R014896, content is 98% (melting point 69-72℃); Fatty acid amide: coconut fatty acid monoethanolamide (CMEA), the manufacturer is Guangzhou Daoming Chemical Co., Ltd., model number is DM-1211.

[0021] Example 1

[0022] A low-temperature starch-type wetting agent, composed of the following raw materials in percentage by mass: Low temperature starch type film-forming agent: 5%; Plasticizer: 0.6%; Lubricant: 2%; Emulsifier: 0.2%; Coupling agent: 0.05%; Cross-linking agent: 0.8%; The balance is water; Among them, the low-temperature starch-type film-forming agent is a composition of hydroxypropyl distarch phosphate, oxidized starch and modified starch in a mass ratio of 1:1:1.4, the emulsifier is a composition of isohexanediol and polyethylene glycol in a mass ratio of 1:1.6, the number average molecular weight of polyethylene glycol is 400, the cross-linking agent is a composition of sodium trimetaphosphate and calcium chloride in a mass ratio of 1:1, the plasticizer is tributyl citrate, the coupling agent is an epoxysilane coupling agent, and the lubricant is fatty acid amide.

[0023] The preparation method of the low-temperature starch-type wetting agent comprises the following steps: S1, mixing an emulsifier, a lubricant and water accounting for 15% of the total mass of water, emulsifying and homogenizing to obtain a lubricant emulsion; S2. Add 25% of the total mass of water to the starch-based film-forming agent, stir and disperse, raise the temperature to 90°C, keep the temperature for 35 minutes, then cool to 65°C to obtain a starch gelatinized liquid; S3. Add a crosslinking agent, a coupling agent, a plasticizer, a lubricant emulsion and the remaining water to the starch gelatinized liquid in sequence, and stir at 65° C. and 400 rpm for 30 min to obtain the low-temperature starch-type wetting agent.

[0024] Example 2

[0025] A low-temperature starch-type wetting agent, composed of the following raw materials in percentage by mass: Low temperature starch type film former: 4%; Plasticizer: 0.2%; Lubricant: 0.5%; Emulsifier: 0.05%; Coupling agent: 0.04%; Cross-linking agent: 0.5%; The balance is water; Among them, the low-temperature starch-type film-forming agent is a composition of hydroxypropyl distarch phosphate, oxidized starch and modified starch in a mass ratio of 1:1:1.2, the emulsifier is a composition of isohexanediol and polyethylene glycol in a mass ratio of 1:1.2, the number average molecular weight of polyethylene glycol is 300, the cross-linking agent is a composition of sodium trimetaphosphate and calcium chloride in a mass ratio of 1:0.5, the plasticizer is tributyl citrate, the coupling agent is a vinyl silane coupling agent, and the lubricant is oleic acid.

[0026] The preparation method of the low-temperature starch-type wetting agent comprises the following steps: S1, mixing an emulsifier, a lubricant and water accounting for 10% of the total mass of water, emulsifying and homogenizing to obtain a lubricant emulsion; S2, adding 20% ​​of the total mass of water to the low-temperature starch film-forming agent, stirring and dispersing, heating to 85°C, keeping the temperature for 40 minutes, and then cooling to 60°C to obtain a starch gelatinized liquid; S3. Add a crosslinking agent, a coupling agent, a plasticizer, a lubricant emulsion and the remaining water to the starch gelatinized liquid in sequence, and stir at 60° C. and 300 rpm for 40 min to obtain the low-temperature starch-type wetting agent.

[0027] Example 3

[0028] A low-temperature starch-type wetting agent, composed of the following raw materials in percentage by mass: Low temperature starch type film former: 8%; Plasticizer: 1.0%; Lubricant: 2.5%; Emulsifier: 0.25%; Coupling agent: 0.08%; Cross-linking agent: 1.0%; The balance is water; Among them, the low-temperature starch-type film-forming agent is a composition of hydroxypropyl distarch phosphate, oxidized starch and modified starch in a mass ratio of 1:1:1.5, the emulsifier is a composition of isohexanediol and polyethylene glycol in a mass ratio of 1:2, the number average molecular weight of polyethylene glycol is 600, the cross-linking agent is a composition of sodium trimetaphosphate and calcium chloride in a mass ratio of 1:1.2, the plasticizer is tributyl citrate, the coupling agent is aminosilane coupling agent, and the lubricant is stearic acid.

[0029] The preparation method of the low-temperature starch-type wetting agent comprises the following steps: S1, mixing an emulsifier, a lubricant and water accounting for 20% of the total mass of water, emulsifying and homogenizing to obtain a lubricant emulsion; S2, adding water accounting for 30% of the total mass of water to the low-temperature starch film-forming agent, stirring and dispersing, heating to 95°C, keeping the temperature for 30 minutes, and then cooling to 70°C to obtain starch gelatinized liquid; S3. Add a crosslinking agent, a coupling agent, a plasticizer, a lubricant emulsion and the remaining water to the starch gelatinized liquid in sequence, and stir at 70° C. and 500 rpm for 20 min to obtain the low-temperature starch-type wetting agent.

[0030] Comparative Example 1 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.

[0031] Comparative Example 2 The difference between Comparative Example 2 and Example 1 is that: hydroxypropyl distarch phosphate is not added to the starch-based film-forming agent, and oxidized starch and modified starch in a mass ratio of 1:1.4 are used as the starch-based film-forming agent.

[0032] Comparative Example 3 The difference between Comparative Example 3 and Example 1 is that: no oxidized starch is added to the starch-based film-forming agent, and hydroxypropyl distarch phosphate and modified starch in a mass ratio of 1:1.4 are used as the starch-based film-forming agent.

[0033] Comparative Example 4 The difference between Comparative Example 4 and Example 1 is that no modified starch is added to the starch-based film-forming agent, and hydroxypropyl distarch phosphate and oxidized starch in a mass ratio of 1:1 are used as the starch-based film-forming agent.

[0034] Comparative Example 5 The difference between Comparative Example 5 and Example 1 is that no cross-linking agent is added in Comparative Example 5.

[0035] Comparative Example 6 The difference between Comparative Example 6 and Example 1 is that no emulsifier is added in Comparative Example 6.

[0036] Comparative Example 7 The difference between Comparative Example 7 and Example 1 is that the total amount of the emulsifier remains unchanged, and only isohexanediol is added to the emulsifier.

[0037] Comparative Example 8 The difference between Comparative Example 8 and Example 1 is that the total amount of the emulsifier remains unchanged, and only polyethylene glycol is added to the emulsifier.

[0038] Performance Testing 1. Membrane strength test The film strength of the wetting agents of Examples 1-3 and Comparative Examples 1-8 was tested using a bursting tester. The specific data are shown in Table 1.

[0039] 2. Product performance test The wetting agents of Examples 1-3 and Comparative Examples 1-8 were respectively coated on D450 (single filament diameter 4 microns) ultrafine glass fiber yarn, the oil coating line speed was 20 m / min, the oil content of the tube yarn was controlled at 1.2±0.20%, the weaving speed was 500 rpm, and the glass fiber samples of each group were obtained. The glass fiber samples were subjected to the following water resistance test and product performance test.

[0040] Glass fiber samples prepared with the sizing agents of Examples 1-5 and Comparative Examples 1-8 were respectively tested for migration, broken fiber rate, hairiness rate and yield rate. The specific test methods are as follows: Migration amount: The migration amount of glass fiber samples is tested according to the method of GB31604.8-2021; Broken filament rate: Use a microscope to magnify and observe the sample, record the number of partial breaks and complete breaks, and calculate the broken filament rate of the glass fiber sample; 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; Finished product rate: Visually select glass fiber yarns with uniform yarn diameter and smooth surface, without obvious defects and impurities as finished products, record their number, and calculate the finished product rate of glass fiber samples. The test results are shown in Table 1.

[0041] Table 1 Film strength of each group of wetting agents and performance data of each group of samples Group / Performance Membrane strength KPa Migration amount / % Wire breakage rate / % Hairiness rate / % Yield rate / % Example 1 228 1.75 0.45 0.51 96.0 Example 2 223 1.80 0.52 0.59 95.2 Example 3 225 1.77 0.48 0.57 95.6 Comparative Example 1 139 10.59 4.13 8.54 71.1 Comparative Example 2 164 7.81 2.77 6.26 77.8 Comparative Example 3 161 7.74 2.74 6.24 78.0 Comparative Example 4 166 7.67 2.71 6.20 78.4 Comparative Example 5 155 7.17 3.92 6.86 86.7 Comparative Example 6 216 8.39 4.65 8.14 80.2 Comparative Example 7 222 5.66 2.57 4.13 86.3 Comparative Example 8 219 5.98 2.70 4.42 85.1 From the results of Example 1 and Comparative Examples 1-4 in Table 1, it can be seen that in the presence of a cross-linking agent, hydroxypropyl distarch phosphate, oxidized starch and modified starch undergo a cross-linking reaction, and the cross-linking reaction forms cross-linked bonds between starch molecules, thereby enhancing the network structure of starch particles, which helps to improve the stability and mechanical strength of the starch film. At the same time, the three components of hydroxypropyl distarch phosphate, oxidized starch and modified starch are used in combination in a specific ratio, which can synergistically improve the bonding strength between the sizing agent and the glass fiber, can coat and bond the glass fiber precursor, give the yarn stiffness, improve the bundling of the yarn, and reduce the hair during deweaving and reduce powder falling.

[0042] From the results of Example 1 and Comparative Example 5 in Table 1, it can be seen that in Comparative Example 5, since no cross-linking agent was added, that is, only one gelatinization and cross-linking were performed, the film strength and the performance of the glass fiber yarn were significantly reduced. The starch-based wetting agent of the present invention is first gelatinized and then a cross-linking agent is added for cross-linking, which can not only improve the stability and film-forming properties of the film-forming agent, but also enhance the adhesion to the fiber, thereby improving the strength, toughness, processing performance, wear resistance and weather resistance of the glass fiber yarn.

[0043] From the results of Example 1 and Comparative Examples 6-8 in Table 1, it can be seen that the addition of the emulsifier has little effect on the film strength, but the performance of the glass fiber yarn products of Comparative Examples 6-8 is significantly reduced. This may be because the overall fluidity of the starch film is reduced, resulting in the inability of the starch-type wetting agent to evenly adhere to the glass fiber yarn to form a film. Hexylene glycol and polyethylene glycol can synergistically reduce the surface tension of the wetting agent, thereby helping the wetting agent to better wet the fiber surface and form a more uniform coating.

[0044] In summary, the low-temperature starch-type wetting agent of the present invention significantly improves the machine operation rate and the utilization rate of the wetting agent during the coating preparation process, while improving the A-grade rate of the product weaving shaft, so as to better meet the production and market needs and promote the sustainable development of the glass fiber electronic yarn industry.

[0045] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit the scope of protection of the present invention. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solution of the present invention can be modified or replaced by equivalents without departing from the essence and scope of the technical solution of the present invention.

Claims

1. A low-temperature starch-based wetting agent, characterized in that: It is composed of the following raw materials in percentage by weight: Low temperature starch type film former: 4-8%; Plasticizer: 0.2-1.0%; Lubricant: 0.5-2.5%; Emulsifier: 0.05-0.25%; Coupling agent: 0.04-0.08%; Cross-linking agent: 0.5-1.0%; The balance is water; Among them, the low-temperature starch-type film-forming agent is a composition of hydroxypropyl distarch phosphate, oxidized starch and modified starch in a mass ratio of 1:1:(1.2-1.5), the manufacturer of the oxidized starch is Foshan Nanhai Huahao Huafeng Starch Co., Ltd.; the manufacturer of the modified starch is Guangdong Huimei Starch Technology Co., Ltd., with a brand name of HM-M215; the emulsifier is a composition of isohexanediol and polyethylene glycol.

2. The low-temperature starch-based wetting agent according to claim 1, characterized in that: The mass ratio of isohexylene glycol to polyethylene glycol is 1:(1.5-2), and the number average molecular weight of polyethylene glycol is 300-600.

3. The low-temperature starch-based wetting agent according to claim 1, characterized in that: The cross-linking agent is sodium trimetaphosphate and / or calcium chloride.

4. The low-temperature starch-based wetting agent according to claim 1, characterized in that: The lubricant is at least one of oleic acid, stearic acid and fatty acid amide; and / or the plasticizer is tributyl citrate.

5. The low-temperature starch-based wetting agent according to claim 1, characterized in that: The coupling agent is at least one of an epoxy silane coupling agent, a vinyl silane coupling agent and an amino silane coupling agent.

6. The method for preparing the low-temperature starch-type wetting agent according to any one of claims 1 to 5, characterized in that: The following steps are involved: S1, mixing an emulsifier, a lubricant and 10-20% of the total mass of water, emulsifying and homogenizing to obtain a lubricant emulsion; S2, adding 20-30% of the total mass of water to the low-temperature starch film-forming agent, stirring and dispersing, heating to 85-95°C, keeping the temperature for a period of time, and then cooling to 60-70°C to obtain starch gelatinized liquid; S3, adding a cross-linking agent, a coupling agent, a plasticizer, a lubricant emulsion and the remaining water to the starch gelatinized liquid in sequence, stirring evenly, to obtain the low-temperature starch type wetting agent.

7. The method for preparing the low-temperature starch-based wetting agent according to claim 6, characterized in that: In step S2, the insulation time is 30-40 minutes.

8. The method for preparing the low-temperature starch-based wetting agent according to claim 6, characterized in that: The stirring temperature in step S3 is 60-70° C., the stirring speed is 300-500 rpm, and the stirring time is 20-40 min.

9. Use of the low-temperature starch-type wetting agent according to any one of claims 1 to 5 in the preparation of glass fiber electronic yarn.