阅读说明：本技术 一种新型浆纱上浆剂及其制备方法 (Novel sizing agent and preparation method thereof ) 是由 杨玺 李晶晶 于 2021-09-23 设计创作，主要内容包括：本发明共公开了一种新型浆纱上浆剂及其制备方法,属于纺织助剂技术领域。本发明公开的新型浆纱上浆剂是以玉米淀粉、木薯淀粉为原料,将其分散在水、醇或者水-乙醇混合介质中,然后加入少量碱控制体系pH值为8.0～9.0进行处理,活化淀粉；采用淀粉质量10％～20％的改性剂在30～90℃下,对淀粉分子结构进行2～4小时的醚化改接和1～5小时的接枝改性处理,在淀粉高分子侧链上引入带有酰胺官能团、磺酸烷基官能罐、季铵盐官能的侧链结构,得到新型浆纱上浆剂。从而赋予上浆剂可生物降解性、高分散性、渗透性、以及优异的成膜性、毛羽抱束性、抗静电性能和减摩性能,以及和纱线良好的亲和力；同时浆膜透明、柔韧、光滑、不发黏。(The invention discloses a novel sizing agent and a preparation method thereof, belonging to the technical field of textile assistants. The novel sizing agent takes corn starch and cassava starch as raw materials, the raw materials are dispersed in water, alcohol or a water-alcohol mixed medium, and then a small amount of alkali is added to control the pH value of a system to be 8.0-9.0 for treatment, so that the starch is activated; the novel sizing agent is prepared by adopting a modifier with the mass of 10-20% of starch to perform etherification grafting for 2-4 hours and grafting modification for 1-5 hours at the temperature of 30-90 ℃, and introducing a side chain structure with amide functional groups, sulfonic acid alkyl functional tanks and quaternary ammonium salt functional groups into a starch macromolecule side chain. Thereby endowing the sizing agent with biodegradability, high dispersibility, permeability, excellent film forming property, hairiness fascinating property, antistatic property and antifriction property, and good affinity with yarn; meanwhile, the serous membrane is transparent, flexible, smooth and non-sticky.)

1. A preparation method of a novel sizing agent for sizing comprises the following steps:

dispersing starch serving as a raw material in water, alcohol or a water-alcohol mixed medium, and then adding a small amount of alkali to control the pH value of a system to be 8.0-9.0 for treatment so as to activate the starch;

carrying out etherification grafting for 2-4 hours and grafting modification for 1-5 hours on a starch molecular structure by adopting a modifier with the mass of 10-20% of the starch at the temperature of 30-90 ℃ to obtain a novel sizing agent;

the novel mortar sizing agent has the following high molecular structure:

wherein: the starch is selected from corn starch or tapioca starch, preferably corn starch;

the active monomer used in the etherification and grafting is an etherification monomer, and the using amount of the etherification monomer accounts for 15-40% of that of the modifier;

the active monomer used in the grafting modification is graft comonomer, and the use amount of the graft comonomer accounts for 60-85% of that of the modifier.

2. The production method according to claim 1, wherein:

the reactive monomers used for the etherification modification include:

sodium 3-chloro-2-hydroxypropyl sulfonate;

hydroxyalkyl acrylates, hydroxyalkyl methacrylates;

alkoxyethyl acrylate, alkoxyethyl methacrylate; and

acrylamidopropyl dimethylbenzyl ammonium chloride acrylate, methacrylamidopropyl dimethylbenzyl ammonium chloride, acryloxypropyl dimethylbenzyl ammonium chloride;

the active monomers used for the graft modification include:

acrylic acid amide, methacrylic acid amide, acrylic acid alkoxyethylamide, methacrylic acid alkoxyethylamide;

aminoalkyl acrylates, aminoalkyl methacrylates; and

vinyl acetate, monoalkyl maleate, dialkyl maleate, N-alkyl maleimide.

3. The production method according to claim 2, wherein:

in the etherification and grafting active monomer:

the dosage of the 3-chlorine-2-hydroxypropyl sodium sulfonate modifier accounts for 10-30 percent of the dosage of the etherification modified grafting active monomer, and preferably 15-20 percent;

the dosage of the acrylic acid amido propyl dimethyl benzyl ammonium chloride, the methacrylic acid amido propyl dimethyl benzyl ammonium chloride and the acrylic acid amido propyl dimethyl benzyl ammonium chloride modifier accounts for 2 to 5 percent of the dosage of the etherification modified grafting active monomer, and is preferably 3 to 5 percent;

the dosage of the modifier of hydroxyethyl acrylate and hydroxypropyl acrylate accounts for 2 to 3 percent of the dosage of the etherification modified active monomer.

4. The production method according to claim 2, wherein:

in the graft copolymerization of the active monomers:

the dosage of acrylic acid amide, methacrylic acid amide, acrylic acid alkoxy ethyl amide and methacrylic acid alkoxy ethyl amide modifiers accounts for 50 percent of the dosage of all the modifiers;

the modifier of the amino alkyl acrylate and the amino alkyl methacrylate accounts for 30 percent of the total modifier;

the modifier of vinyl acetate, maleic acid monoalkyl ester, maleic acid dialkyl ester, N-alkyl maleimide accounts for 20% of the total modifier.

5. The production method according to claim 2, wherein:

hydroxyalkyl acrylates include: hydroxyethyl acrylate, hydroxypropyl acrylate;

hydroxyalkyl methacrylates include: hydroxyethyl methacrylate, hydroxypropyl methacrylate;

the alkoxyethyl acrylate comprises: ethylene glycol monoalkyl ether acrylate;

the alkoxyethyl methacrylate comprises: ethylene glycol monoalkyl ether methacrylate;

acrylic acid alkoxyethylamides include: ethylene glycol monoalkyl ether acrylamide;

the methacrylic acid alkoxyethylamides include: ethylene glycol monoalkyl ether methacrylamide;

aminoalkyl acrylates include: aminoethyl acrylate, aminopropyl acrylate;

aminoalkyl methacrylates include: aminoethyl methacrylate, aminopropyl methacrylate.

6. The production method according to claim 5, wherein:

ethylene glycol monoalkyl ethers include: ethylene glycol monomethyl ether, monoethyl ether, monopropyl ether and monobutyl ether.

7. The production method according to claim 5 or 6, wherein:

the modifier comprises:

3-chloro-2-hydroxypropyl sodium sulfonate, hydroxyethyl acrylate, hydroxypropyl acrylate, ethylene glycol monomethyl ether acrylate, acrylamido propyl dimethyl benzyl ammonium chloride, acrylamide, aminoethyl acrylate, and vinyl acetate.

8. The production method according to any one of claims 1 to 5, wherein:

the using amount of the modifier is 12-18% of the mass of the starch, and preferably 14-16%.

9. The production method according to claim 1, wherein:

during the graft copolymerization, an initiator accounting for 1-5 percent of the total mass of the graft copolymerization modifier is also needed to be added, and the preference is 2-3 percent.

10. The production method according to claim 1, wherein:

when alcohol is used as a reaction medium, selecting low-carbon alcohol, preferably ethanol;

when a water-ethanol mixed solvent is used as a reaction medium, the m/m of water/ethanol is controlled to be between 20:80 and 80:20, and preferably between 30:70 and 70: 30.

Technical Field

The invention belongs to the technical field of textile assistants, and relates to a preparation method of a novel sizing agent and the novel sizing agent prepared by the preparation method.

Background

Sizing, a fine chemical for surface treatment of yarns prior to weaving. The good sizing agent has good binding force with the yarn, film forming property, hairiness holding property, antifriction property and breaking tensile property consistent with the yarn, thereby improving the spinnability of the yarn, reducing broken ends and improving the efficiency of a weaving machine; meanwhile, the sizing agent also has the advantages of thorough desizing, no influence on the printing and dyeing of cloth, degradability and no influence on the environment. Therefore, the sizing agent with good comprehensive performance and biodegradability is one of the hot spots of research and development in the field of textile industry.

The polyvinyl alcohol PVA is a sizing agent with better comprehensive performance, has good film forming property, hairiness holding property and flexibility, and has better desizing performance. However, polyvinyl alcohol is difficult to biodegrade after entering into ecological environment, and has great influence on environment. The polyester sizing agent is a novel sizing agent with better performance than polyvinyl alcohol PVA, but also has the characteristic of nonbiodegradability or difficult degradation, and does not meet the requirement of green environmental protection.

The traditional starch-based sizing agent for sizing yarns by taking corn starch and tapioca starch as raw materials comprises oxidized starch, phosphate starch, acetate starch, acetal-based modified starch, acrylic acid (acrylamide), acrylic ester (methacrylate), maleic anhydride, maleic acid monoalkyl ester, maleic acid dialkyl ester and other starch sizing agents which are grafted and modified by active monomers with unsaturated double bonds, improves the biodegradability of the sizing agent to a certain extent, but has obvious defects in the aspects of film forming property, film toughness, film hygroscopicity and the like; meanwhile, the loss in the sizing process is large, the slashing has serious powder falling in the weaving process, the yarn is easy to break, the moisture absorption adhesion is caused, the hairiness holding performance is poor, the efficiency of the weaving machine is low, and the like.

Based on the analysis, the novel environment-friendly sizing agent is designed and synthesized by long-term research and practice in combination with the actual conditions of sizing, desizing and weaving processes from the perspective of molecular level, is used for the sizing treatment process of cotton yarns, cotton-polyester blended yarns and cotton wool blended yarns, and obtains better comprehensive performance.

Disclosure of Invention

In view of the above disadvantages, the present application discloses a novel sizing agent, which improves the defects of non-biodegradability or difficult biodegradation, film forming property, film toughness, low film moisture absorption, large sizing loss, etc. of the conventional sizing agent.

The invention is realized by the following means:

the novel sizing agent provided by the invention takes corn starch and cassava starch as raw materials, particularly corn starch, and has rich and stable sources. The molecular structure of the starch is modified through chemical reaction to obtain the modified starch sizing agent with a specific performance side chain structure.

In the synthesis process of the novel sizing agent, a side chain structure with amide functional groups, sulfonic acid alkyl functional groups and quaternary ammonium salt functional groups is introduced on a starch macromolecule side chain by adopting means of etherification modification and grafting modification, so that the sizing agent is endowed with biodegradability, high dispersibility, permeability, excellent film forming property, hairiness beam holding property, antistatic property and antifriction property, and good affinity is provided for yarns; the serous membrane is transparent, flexible, smooth and non-sticky.

The polymer structure of the novel sizing agent provided by the invention is expressed as follows:

wherein sulfonate groups, quaternary ammonium salt groups, hydroxyethyl acrylate, hydroxypropyl acrylate groups and the like are connected into a starch molecular structure through etherification reaction; acrylamide, aminoalkyl acrylate group, vinyl acetate group and the like are introduced into the molecular structure of the starch by means of graft copolymerization.

Further, the modifier for modifying the molecular structure of the starch comprises:

sodium 3-chloro-2-hydroxypropyl sulfonate; hydroxyethyl acrylate, hydroxypropyl acrylate, alkoxyethyl acrylate, aminoalkyl acrylate; hydroxyethyl methacrylate, hydroxypropyl methacrylate, alkoxyethyl methacrylate, aminoalkyl methacrylate; acrylic acid amide, methacrylic acid amide; acrylic acid alkoxyethyl amide, methacrylic acid alkoxyethyl amide; vinyl acetate, monoalkyl maleates, dialkyl maleates, N-alkyl maleamides, and the like.

Further, the modifier for modifying the molecular structure of the starch comprises:

3-chloro-2-hydroxypropyl sodium sulfonate, acrylic acid, hydroxypropyl acrylate, hydroxyethyl acrylate, acrylamide, alkoxyethyl acrylate amide, aminoalkyl acrylate, dimethylaminoalkyl acrylate, methacrylic acid, aminoalkyl methacrylate, monohydroxyalkyl maleate, N-alkylmaleimide; acrylic acid amido propyl dimethyl benzyl ammonium chloride, methyl acrylic amide propyl dimethyl benzyl ammonium chloride, acryloxy propyl dimethyl benzyl ammonium chloride, etc.

Further, the aminoalkyl acrylate comprises: aminoethyl acrylate, aminopropyl acrylate, and the like.

The starch is structurally modified by the modifier, and functional groups such as sulfonate, aminoalkyl, quaternary ammonium salt and the like are introduced into the starch structure, so that the modified starch-based sizing agent has low foaming property, good film forming property and film flexibility, antibacterial and antistatic properties and good permeability.

In the novel sizing agent for sizing provided by the invention, the using amount of the modifier accounts for 10-20% of the mass of starch, especially 12-18%, especially 14-16%. The modifier is more than 20 percent, the modified starch sizing agent has higher cost, and simultaneously, the viscosity and the permeability of the sizing agent are influenced, and the moisture absorption performance is influenced. The dosage of the modifier is less than 10 percent, and the performance modification is not obvious.

In the starch structure modifier, the dosage of the 3-chloro-2-hydroxypropyl sodium sulfonate modifier accounts for 10 to 30 percent of the dosage of all the modifiers, particularly 15 to 20 percent; the using amount of the 3-chlorine-2-hydroxypropyl sodium sulfonate is more than 30 percent, on one hand, the cost of the sizing agent is increased, meanwhile, foams exist in the size boiling process, the integrity of a formed film is influenced, the permeability of the size is reduced, and meanwhile, the size film is large in moisture absorption and easy to absorb moisture and is sticky. The dosage of the 3-chloro-2-hydroxypropyl sodium sulfonate is less than 10 percent, the slurry has poor stability, the slurry is easy to be uneven in the storage process, and the slurry film is easy to be brittle and has insufficient flexibility.

Among the starch structure modifiers, acrylamide, hydroxyethyl acrylate, hydroxypropyl acrylate, aminoethyl acrylate, acrylamidopropyl dimethylbenzyl sodium chloride and other reactive monomers, and the quaternary ammonium salt monomers acrylamidopropyl dimethylbenzyl ammonium chloride and acryloxypropyl dimethylbenzyl ammonium chloride are preferably used. The quaternary ammonium salt active monomer accounts for 2-5 percent of the total mass of the modified monomer, especially 3-5 percent; the introduction of the quaternary ammonium salt monomer mainly endows the pulp membrane with antistatic performance, flexibility and antibacterial performance, the dosage is lower than 2%, and the effect is not obvious; over 5% and high cost.

In the starch modifier, the hydroxyalkyl acrylate mainly refers to hydroxyethyl acrylate and hydroxypropyl acrylate; the dosage of the hydroxyethyl acrylate and the hydroxypropyl acrylate is 1:1, and the hydroxyalkyl acrylate accounts for 2-3% of the total modifier.

The novel sizing agent for sizing yarn provided by the invention is completed by two steps, and is characterized in that active monomers such as 3-chlorine-2-hydroxypropyl sodium sulfonate, acrylamide propyl dimethyl benzyl ammonium chloride, hydroxyethyl acrylate, hydroxypropyl acrylate and the like react with starch under alkaline conditions, and hydroxyl in starch molecules and double bonds of the modifier are utilized to perform addition etherification (Michael addition reaction) or perform nucleophilic condensation reaction with chlorine-carbon to synthesize ether, so that a short chain structure is introduced to the side surface of a starch macromolecular chain. After the first step of reaction is finished, acrylamide, aminopropyl acrylate and vinyl acetate monomers are directly input into a reaction system without a separation process, an initiator (ammonium persulfate) is added to initiate graft copolymerization, and a copolymerization long chain is introduced on a starch macromolecule side chain to plasticize starch and endow the film-forming flexibility; and high permeability of the slurry.

In the novel sizing agent for sizing, the active monomers used in the graft copolymerization reaction comprise 50% of amide monomers, 30% of amino ester monomers and 20% of vinyl acetate monomers.

In the synthesis reaction of the novel sizing agent provided by the invention, water can be used as a reaction medium, and alcohol can also be used as a reaction medium. When alcohol is used as a reaction medium, low-carbon alcohol such as methanol and ethanol is mainly selected, and particularly ethanol is used as a medium. When a water-ethanol mixed solvent is adopted as a reaction medium, the mass ratio of water to ethanol is controlled to be 20: 80-80: 20, particularly 30: 70-70: 30. Thus, the obtained modified starch sizing agent can be suspended in a medium in a fine and uniform solid powder form, and the separation and drying of the product are facilitated.

When the novel sizing agent synthesis reaction provided by the invention is carried out in a pure water medium, firstly, an etherification reaction is carried out; then medium copolymerization reaction is carried out; the obtained slurry water dispersion is directly added into methanol or ethanol to separate out the solid of the sizing agent, and then the filtration and the separation are carried out. Compared with the method that a water-alcohol mixed medium is directly adopted, the reaction process is carried out in water, and the method is relatively safe and environment-friendly.

The novel sizing agent provided by the invention is synthesized at a reaction temperature of 30-90 ℃, especially 50-80 ℃. The reaction temperature ranges of the etherification reaction and the grafting process can be the same or different.

Before the novel sizing agent for sizing provided by the invention is subjected to structure modification, starch is required to be dispersed in water or a water-ethanol mixed medium firstly, and then a small amount of sodium hydroxide or potassium hydroxide is added for treatment so as to activate the starch, thereby being beneficial to subsequent etherification and graft copolymerization. The sodium hydroxide and the potassium hydroxide can be solid, or can be dissolved by water or ethanol-water to prepare 10-50% alkali solution, especially 30-45% alkali solution. The amount of sodium hydroxide or potassium hydroxide is controlled so that the pH is 8.0-9.0 throughout the reaction.

The novel sizing agent provided by the invention is synthesized under normal pressure, the synthesis reaction time is controlled to be 3-9 hours, the etherification reaction time is controlled to be 2-4 hours, and the graft copolymerization modification time is controlled to be 1-5 hours.

In the synthesis of the novel sizing agent for sizing yarns, the dosage of the initiator ammonium persulfate is 1-5 percent, especially 2-3 percent of the total mass of the comonomer active substances.

Detailed Description

Example 1

Adding 4L of water-ethanol (2:8, m/m) mixed solvent into a 10L jacketed glass stirring reaction kettle equipped with a stirrer, a reflux condenser, a thermometer and a balance feeder, then adding 1.0kg of corn starch, starting a stirring motor, and fully and uniformly dispersing the starch in a medium; adding a sodium hydroxide aqueous solution with the concentration of 20% through an equilibrium feeder, and adjusting the pH of the system to 9.0; hot water or normal temperature water with the temperature of 80 ℃ is introduced into a jacket of the reaction kettle, and the temperature of materials in the reaction kettle is controlled to be 55-65 ℃; adding 25g of 3-chloro-2-hydroxypropyl sodium sulfonate, 4.5g of acrylamide propyl dimethyl benzyl ammonium chloride quaternary ammonium salt monomer, 2g of hydroxyethyl acrylate, 2g of hydroxypropyl acrylate and 1.5g of ethylene glycol monomethyl ether acrylate into the system, fully stirring and uniformly mixing, and carrying out etherification reaction for 3 hours at a constant system temperature of 60-70 ℃; then adding 55g of acrylamide, 33g of aminopropyl acrylate and 22g of vinyl acetate into the system; fully and uniformly mixing; adding 1g of ammonium persulfate into a balance feeder to initiate graft copolymerization reaction; controlling the temperature to be 70-75 ℃ for reaction for 3 hours, supplementing 1g of ammonium persulfate again, and continuing stirring for reaction for 2 hours; and (3) maintaining the pH value of the system to be 9.0 by using alkali liquor in the reaction process, cooling after the reaction is finished, filtering, washing a filter cake by using a small amount of ethanol, and drying to obtain 1124g of white powdery starch modified green sizing agent with the yield of 98.2%.

Example 2

Adding 4L of water-ethanol (3:7, m/m) mixed solvent into a 10L jacketed glass stirring reaction kettle equipped with a stirrer, a reflux condenser, a thermometer and a balance feeder, then adding 1.0kg of corn starch, starting a stirring motor, and fully and uniformly dispersing the starch in a medium; adding 30% sodium hydroxide aqueous solution through an equilibrium feeder, and adjusting the pH of the system to 8.5; hot water or normal temperature water with the temperature of 80 ℃ is introduced into a jacket of the reaction kettle, and the temperature of materials in the reaction kettle is controlled to be 65-75 ℃; adding 30g of 3-chloro-2-hydroxypropyl sodium sulfonate, 4g of methacrylamidopropyl dimethyl benzyl ammonium chloride quaternary ammonium salt monomer, 1.5g of hydroxyethyl methacrylate, 1.5g of hydroxypropyl methacrylate and 2g of ethylene glycol monobutyl ether methacrylate into the system, fully stirring and uniformly mixing, and then carrying out etherification reaction for 2 hours at a constant system temperature of 70-75 ℃; then adding 55g of methacrylamide, 33g of aminoethyl methacrylate, 10g of monomethyl maleate and 12g of diethyl maleate into the system; fully and uniformly mixing; 2g of ammonium persulfate is added from a balance feeder to initiate graft copolymerization reaction; controlling the temperature to be 70-75 ℃ for reaction for 2 hours, supplementing 1g of ammonium persulfate again, and continuing stirring for reaction for 3 hours; and (3) maintaining the pH value of the system to be 8.5 by using alkali liquor in the reaction process, cooling after the reaction is finished, filtering, washing a filter cake by using a small amount of ethanol, and drying to obtain 1126g of white powdery starch modified green sizing agent with the yield of 98%.

Example 3

Adding 4L of water-methanol (7:3, m/m) mixed solvent into a 10L jacketed glass stirring reaction kettle equipped with a stirrer, a reflux condenser, a thermometer and a balance feeder, then adding 1.0kg of corn starch, starting a stirring motor, and fully and uniformly dispersing the starch in a medium; adding a 35% sodium hydroxide aqueous solution through an equilibrium feeder, and adjusting the pH of the system to 8.0; hot water or normal temperature water with the temperature of 60 ℃ is introduced into a jacket of the reaction kettle, and the temperature of materials in the reaction kettle is controlled to be 45-55 ℃; adding 28g of 3-chloro-2-hydroxypropyl sodium sulfonate, 5g of acryloyloxy propyl dimethyl benzyl ammonium chloride monomer, 1.5g of hydroxyethyl acrylate, 1.5g of hydroxypropyl methacrylate and 3g of ethylene glycol monomethyl ether methacrylate into the system, fully stirring and uniformly mixing, and carrying out etherification reaction for 3 hours at a constant system temperature of 50-60 ℃; then adding 60g of methacrylamide, 36g of aminoethyl methacrylate, 16g of vinyl acetate and 8g of N-methyl maleimide into the system; fully and uniformly mixing; adding 3g of ammonium persulfate into the balance feeder to initiate graft copolymerization reaction; controlling the temperature to be 55-65 ℃ for reaction for 2 hours, supplementing 1g of ammonium persulfate again, and continuing stirring for reaction for 3 hours; and (3) maintaining the pH value of the system to be 8.0 by using alkali liquor in the reaction process, cooling after the reaction is finished, filtering, washing a filter cake by using a small amount of methanol, and drying to obtain 1078g of white powdery starch modified green sizing agent with the yield of 93%.

Example 4

Adding 5L of water into a 10L jacketed glass stirring reaction kettle provided with a stirrer, a reflux condenser, a thermometer and a balance feeder, then adding 1.0kg of corn starch, starting a stirring motor, and fully and uniformly dispersing the starch in a medium; adding a 15% sodium hydroxide aqueous solution through an equilibrium feeder, and adjusting the pH of the system to 8.0; hot water or normal temperature water with the temperature of 90 ℃ is introduced into a jacket of the reaction kettle, and the temperature of materials in the reaction kettle is controlled to be 75-85 ℃; adding 25g of 3-chloro-2-hydroxypropyl sodium sulfonate, 5g of acryloyloxy propyl dimethyl benzyl ammonium chloride monomer, 2g of hydroxyethyl acrylate, 2g of hydroxypropyl acrylate and 2g of ethylene glycol monoethyl ether methacrylate into the system, fully stirring and uniformly mixing, and then carrying out etherification reaction for 4 hours at a constant system temperature of 75-85 ℃; then adding 60g of methacrylamide, 36g of aminoethyl methacrylate, 12g of vinyl acetate and 12g of monomethyl maleate into the system; fully and uniformly mixing; 2g of ammonium persulfate is added from a balance feeder to initiate graft copolymerization reaction; controlling the temperature to be 75-80 ℃ for reaction for 2 hours, supplementing 2g of ammonium persulfate again, and continuing stirring for reaction for 2 hours; the PH of the system is maintained at 8.0 by alkali liquor in the reaction process, and the temperature is reduced after the reaction is finished. Pouring the slurry system into 10L of ethanol solution for dispersion, filtering, washing a filter cake by using a small amount of ethanol, and drying to obtain 1040g of white powdery starch modified green sizing agent with the yield of 90%.

Example 5

Adding 250L of ethanol-water (8:2, m/m) miscible solvent into a 500L stainless steel jacket reaction kettle, then adding 50kg of corn starch, starting stirring, and fully dispersing the starch to obtain starch slurry; adjusting the pH value of the system to 9.0 by adding sodium hydroxide lye; introducing hot water into a jacket of a reaction kettle, maintaining the temperature of materials between 55 and 65 ℃, fully activating starch for 30 minutes, and then adding 1.2kg of 3-chloro-2-hydroxypropyl sodium sulfonate, 230g of acrylic acid amido propyl dimethyl benzyl ammonium chloride quaternary ammonium salt monomer, and 100g of each of hydroxyethyl acrylate and hydroxypropyl acrylate into the system; maintaining the temperature and the { pH value for etherification reaction for 4 hours; then adding 300g of acrylamide, 180g of aminopropyl acrylate, 120g of vinyl acetate and 6g of initiator into the reaction kettle, fully and uniformly mixing, heating to 75 ℃ to initiate polymerization reaction, supplementing 6g of ammonium persulfate after 3 hours, continuing the reaction for 2 hours, and finishing the reaction; and (3) cooling, filtering, leaching a filter cake by using 2kg of ethanol, and drying to obtain 51.8kg of white uniform sizing agent with the yield of 98.4%.

Test examples

The slashing agent obtained in the above embodiments is used, slashing liquid obtained after boiling is compared with raw yarn in a simulation sizing experiment of cotton yarn, and the result shows that the slashing obtained in each group of embodiments is straight, has a uniform surface, is complete and smooth in film formation, and has no hairiness. The slashing is observed after friction and wear experiments, and specific results are detailed in table 1.

TABLE 1 basic properties of the slashes of each group

According to the results in table 1, the slashing agent prepared by the embodiment of the invention has no significant change on the surface of the slashing after friction after being used for treating cotton yarns, and has no bifurcation, hairiness and peeling, thereby showing that the slashing has good wear resistance and better weaving performance.

Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.