Method for synthesizing composite modified starch slurry

A compound modified starch and synthetic method technology, which is applied in fiber types, textiles and papermaking, fiber treatment, etc., can solve the problems of high molecular weight, poor adhesion performance of starch size film, and difficulty in chain segment movement, so as to improve adhesion Performance, improvement of serous film performance, and convenient transportation

Inactive Publication Date: 2012-07-18
芜湖迅腾新材料有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since starch molecules are composed of cyclic glucose residues containing 3 hydroxyl groups, the molecular weight is relatively high, the hydrogen bonds between molecules are strong, and the movement of chain segments is difficult. The defects in the structure of these starch macromolecules themselves cause starch film properties and Poor adhesion to synthetic fibers such as polyester, as shown in the examples, the elongation at break of the cornstarch size film is 2.29%, and the abrasion is 0.607mg / cm 2 , The number of buckling resistance is 478 times, the adhesion to polyester fiber is 100.83N, and the adhesion work is 0.899J, which cannot well meet the requirements of warp yarn sizing, especially synthetic fiber sizing such as polyester.

Method used

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  • Method for synthesizing composite modified starch slurry
  • Method for synthesizing composite modified starch slurry
  • Method for synthesizing composite modified starch slurry

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Take by weighing 300 grams of cornstarch (dry weight), add water to make a starch milk with a concentration of 40%, then transfer the starch milk into a 1000mL four-necked flask, install a stirring device, and then place the temperature in a water bath to 50°C. Use 3% sodium hydroxide solution to maintain system pH=11~11.5, slowly add a concentration of 50% aqueous solution containing 12 grams of cationic etherification agent 3-chloro-2-hydroxypropyltrimethylammonium chloride under stirring, and react 6 After one hour, neutralize with 3% hydrochloric acid solution to pH=6.5-7; the product is filtered, washed with water three times, dried at 45°C to constant weight, crushed and sieved to synthesize cationic starch. The cationic denaturation degree of substitution of the product is DS=0.022, and the properties of the size film and the adhesion properties to polyester fibers are shown in Attached Table 1.

Embodiment 2

[0028] Take by weighing 100 grams of cornstarch (dry weight), add water to make concentration of 40% starch milk, then transfer the starch milk into a 500mL four-necked flask, install a stirring device, then place the temperature in a water bath to 35°C, Use 3% sodium hydroxide solution to maintain the pH of the system=8.5~9, slowly add dropwise under stirring an absolute ethanol solution with a volume concentration of 25% containing 4 grams of dodecenyl succinic anhydride, and react with 3% hydrochloric acid after 7 hours The solution is neutralized to pH=6.5-7; the product is filtered, washed three times with 70% ethanol aqueous solution, dried at 45°C to constant weight, crushed and sieved to synthesize starch dodecenyl succinate. The esterification denaturation substitution degree of the product is DS=0.016, and the size film properties and adhesion properties to polyester fibers are shown in Attached Table 1.

Embodiment 3

[0030]Take by weighing 300 grams of cornstarch (dry weight), add water to make a starch milk with a concentration of 40%, then transfer the starch milk into a 1000mL four-necked flask, install a stirring device, and then place the temperature in a water bath to 50°C. Use 3% sodium hydroxide solution to maintain system pH=11~11.5, slowly add a concentration of 50% aqueous solution containing 12 grams of cationic etherification agent 3-chloro-2-hydroxypropyltrimethylammonium chloride under stirring, and react 6 After one hour, neutralize with 3% hydrochloric acid solution to pH=6.5-7; the product is filtered, washed with water three times, dried at 45°C to constant weight, crushed and sieved to synthesize cationic starch. Take by weighing 100 grams (dry weight) of cationic starch synthesized, add water to make concentration of 40% starch milk, then transfer the starch milk into a 500mL four-necked flask, install a stirring device, then place the temperature in a water bath and he...

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Abstract

The invention discloses a method for synthesizing composite modified starch slurry, belonging to the technical field of methods for synthesizing the modified starch slurry applied to starching of spinning warps. The method comprises the following steps of: firstly carrying out positive ion modification on starch by utilizing quaternary ammonium type positive ion etherifying agent 3-chlorine-2-hydroxypropyltrimethylammonium chloride to synthesize positive ion starch, and carrying out an esterification reaction between the synthesized positive ion starch and dodecenylsuccinic anhydride so as to synthesize positive ion-dodecenylsuccinate composite modified starch slurry. According to the method for synthesizing the composite modified starch slurry, disclosed by the invention, positive ion groups and ester group which is large in volume and provided with vinyl group are introduced in a starch macromolecular chain so that film performances of the starch slurry is remarkably modified, and adhesion performance of the slurry to synthetic fibers such as terylene can be improved, thus starching requirements of warps, especially the terylene and the like, are better met. The method for synthesizing the composite modified starch slurry, disclosed by the invention, can be used for starching warps of fibers such as cotton, linen, mucilage glue and terylene/cotton, terylene/linen, terylene/mucilage glue through a common sizing machine or a high-speed sizing machine.

Description

technical field [0001] The invention belongs to the technical field of the synthesis method of the modified starch size used in textile warp yarn sizing. Background technique [0002] On the loom, the warp yarn per unit length is unwound from the weaving beam until it forms a fabric, and it will be stretched, buckled and worn 3000 to 5000 times. The surface hairiness of unsized warp yarns is prominent, and the cohesion between fibers is insufficient. Under the action of this complex mechanical force, the yarn body is fluffed, the fibers are free, the yarn disintegrates, and ends are broken; It leads to unclear opening and the formation of weaving defects, which makes the normal weaving process impossible. [0003] Sizing is a key process in the textile production process. Sizing is to attach a certain amount of sizing to warp yarns and form a sizing film after drying. After sizing the warp yarn, a layer of sizing agent is adhered around the yarn body, and a tough sizing f...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08B31/16D06M15/11D06M101/32
Inventor 张朝辉徐珍珍王宗乾董菁许德生
Owner 芜湖迅腾新材料有限公司
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