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Method for preparing starch-g-PVA graft starch slurry for improving mechanical property of starch film and use thereof

A technology for grafting starch and starch, applied in the field of modified starch sizing, can solve the problems of uneven sizing and poor mechanical properties of sizing film, and achieve the effects of improving sizing quality, improving mechanical properties and reducing the degree of phase separation.

Inactive Publication Date: 2006-10-11
JIANGNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a kind of preparation method and the application of the starch-g-PVA grafted starch size that improves size film mechanical property, thereby improve the miscibility between starch and PVA component, improve starch and PVA blending size film mechanical properties; looking for suitable size components and their combinations, so that the prepared size blend can overcome the poor mechanical properties of the size film and uneven sizing caused by the poor miscibility between starch and PVA components Improve the use effect of size blends in warp yarn sizing production

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] The raw corn starch that is 80 grams of dry weight is dispersed in 320 milliliters of distilled waters, after adjusting pH to 3-4 with 1M sulfuric acid, move in the 1000 milliliters of four-neck bottles, with N 2 Ventilation and deoxygenation were carried out 4 times, and then vinyl acetate monomer and initiator aqueous solution were added dropwise at the same time. The consumption of vinyl acetate monomer to starch is 40% (32 grams), initiator H 2 o 2 and FeSO 4 ·(NH 4 ) 2 SO 4 ·6H 2 The molar ratio of O to starch is 0.02 (30%H 2 o 2 1.2 ml) and 0.001 (0.2 g), which were formulated as 0.5% and 0.6% aqueous solutions for use. Control the dropping speed of the monomer and the initiator solution, so that the vinyl acetate monomer and the aqueous solution of the initiator are uniformly added to the reaction system within 60 and 90 minutes, respectively. Response to N 2 Under air protection, stir and react at 30°C for 3 hours, then neutralize, filter, wash with wa...

Embodiment 2

[0022] Using the method, steps and parameters of Example 1, only the monomer consumption in the starch graft copolymerization reaction was changed, and the consumption of vinyl acetate monomer to starch was 60% (48 grams). The grafting rate of the product is 12.96%; the grafting efficiency is 50.3%; the grafted branched chain molecular weight is 11.7×10 4 .

[0023] The starch-g-polyvinyl alcohol synthesized in this example was blended with corn starch according to the ratio of 10% and 20%, and then slurried, and then mixed evenly with the PVA slurry in the form of slurry blending at 95°C. Wherein the mass ratio of starch and PVA component is 40:60, and controls the mixing ratio between starch and PVA according to the mode of embodiment 1. Prepare the size film under the specified conditions and test its performance indicators. See attached table 1 for the size film breaking strength, elongation at break and abrasion.

Embodiment 3

[0025] Using the method, steps and parameters of Example 1, only the alkali molar ratio in the starch-g-polyvinyl acetate hydrolysis reaction is changed, that is, the alkali molar ratio is 0.065. The grafting rate of the product is 9.12%; the grafting efficiency is 48.8%; the grafted branched chain molecular weight is 10.5×10 4 . Adjusting the alkali molar ratio in the hydrolysis reaction to 0.01-0.3:1 can make the hydrolysis reaction meet the requirements.

[0026] The starch-g-polyvinyl alcohol synthesized in this example was prepared according to the method in Example 1 to prepare a size film and test its performance indicators. The breaking strength, elongation at break and abrasion of the size film are shown in Attached Table 1.

[0027] Starch-g-PVA to

[0028] The molar ratio consumption of vinyl acetate monomer to starch can be adjusted between 0.02:1-1:1, and the technical parameter of the starch-g-polyvinyl alcohol component of making is: graft rate 1.0%-2...

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Abstract

This invention is a preparation method of starch-g-PVA amylopectin starch slurry which could increase starch film's mechanic properties. It belongs to converted starch slurry technology used in weaving and warp sizing. We adopt graft copolymerization and the following hydrolytic reaction to add polyvinyl alcohol grafting branch chain onto starch macromolecules. Then we get starch-g-PVA amylopectin starch slurry constitutes. Mix the starch with PVA in certain proportion. This invention is advantageous in solving layers problem of slurry mixture, irregular dressing and starch lump blemishes. It also increases the mechanic properties of the mixed starch and PVA, increase weaving efficiency and reduce weaving end breakage rate.

Description

technical field [0001] The invention discloses a preparation method and application of a starch-g-PVA grafted starch size for improving the mechanical properties of a size film, and belongs to the technical field of modified starch size used in textile warp yarn sizing. technical background [0002] Warp sizing is an important process in the textile production process. Its purpose is to improve the wear resistance of warp yarns, reduce warp yarn hairiness, increase warp yarn strength, maintain the elasticity and elongation of warp yarns, thereby reducing the weaving broken end rate and improving production efficiency. , Improve product quality. [0003] The size used in sizing production is a kind of special adhesive, which is a key auxiliary to ensure the normal progress of weaving production. Its performance and the compatibility between components will directly affect the quality of textiles. Productivity and its quality. Size mainly includes starch, polyvinyl alcohol (...

Claims

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Application Information

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IPC IPC(8): C08F251/00C08F8/12D06M15/11
Inventor 祝志峰
Owner JIANGNAN UNIV
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