Composite modified graft starch for textile slurry and preparation method thereof
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A technology of grafted starch and textile size, applied in textiles and papermaking, fiber type, fiber treatment, etc., can solve the problems of long production process and high environmental pressure, achieve good response, excellent performance, and break through cost concerns Effect
Active Publication Date: 2012-12-26
鑫西达(上海)生物科技有限公司
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[0010] The present invention intends to provide a method different from the current method of wet production of grafted starch under water phase conditions, so as to overcome the long production process flow in wet production, need to soak and wash with a large amount of water, and generate a large amount of industrial waste water. Defects that put a lot of pressure on the environment
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Embodiment 1
[0051] A kind of compound denatured grafted starch that textile size is used, its proportioning is:
[0052] Acetate starch 900Kg
[0053] 95% (v / v) alcohol 100Kg
[0054] Acrylamide 40Kg
[0055] Acrylic acid 10Kg
[0056] Vinyl acetate 40Kg
[0057] Caustic soda (sodium hydroxide) 5Kg
[0058] Composite catalyst 0.2Kg
[0059] Final product: 996Kg±5%
[0060] The viscosity requirement of described acetate starch:
[0061] L: 4.0-8.0mPa.S
[0062] M: 8.1-12.0mPa.S
[0063] H: 12.1-16.0mPa.S
[0064] Substitution degree: 0.10±10%.
[0065] The composite catalyst is composed of cerium sulfate and potassium persulfate in a weight ratio of 1:1.
[0066] A kind of preparation method of the compound denatured grafted starch that textile size is used, the step is:
[0067] Add 900kg of acetate starch into a box reactor with a strong stirrer, and heat to 45°C during stirring;
[0068] Composite catalyst 0.2-0.5kg, pre-dissolved with 10Kg of alcohol at a weight ratio of w...
Embodiment 2
[0084] Composite catalyst consumption is 0.52kg, alcohol (volume concentration 98%) consumption 80kg, all the other are with embodiment 1. The effect is the same.
Embodiment 3
[0086] The reaction temperature was fixed at 45° C., the dosage of the composite catalyst was 0.4 g / 900 g of acetate starch, and the ratio of the remaining raw materials was the same as in Example 1. Then under the same stirring speed condition. Sampling in different reaction time periods, then measure the index of grafted starch---grafting rate (calculate the grafting rate of acrylamide with dimethylformamide as extraction solvent), the result is as follows figure 2 shown.
[0087] The grafting rate increased with the prolongation of the reaction time at the initial stage of the reaction. After the reaction reached 150 minutes, the index hardly changed, and the reaction was considered complete. Therefore, the selected reaction time is 150-160min.
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Abstract
The invention discloses a proportioning and preparing method for producing graft starch and particularly relates to composite modified graft starch for textile slurry. The composite modified graft starch for the textile slurry comprises the following raw materials in parts by weight according to proportion: 900 parts of acetate starch, 80-100 parts of alcohol, 40 parts of acrylamide, 10 parts of acrylic acid, 40 parts of vinyl acetate, 5 parts of caustic soda flakes, and 0.2-0.5 part of composite catalyst; and the requirements on the viscosity of the acetate starch is that L (Low Viscosity) is 4.0-0.0mPa.S, M (Middle Viscosity) is 8.1-12.0mPa.S, H (High Viscosity) is 12.1-16.0mPa.S, and the degree of substitution is 0.10+ / -10%. According to the invention, a small amount of alcohol is adopted for production for the first time in China, and two problems to be solved on no utilization of water resources and no wastewater emission and treatment are solved. Ternary mixed monomers are grafted onto starch macromolecules under the condition of the alcohol solvent. Therefore, the serous coat performance of starch slurry is greatly improved, the requirements of textile manufactures on the starching of high-count polyester / cotton varieties, and the composite modified graft starch can replace PVA (Polyvinyl Acetate) to perform environment-friendly starching.
Description
technical field [0001] The invention relates to a production proportion and preparation method of grafted starch, in particular to a production proportion and preparation method of compound denatured grafted starch used for textile size. Background technique [0002] Grafted starch is widely used in papermaking additives, petroleum industry, and textile sizing. Warp sizing is an important process in textile production, which directly affects loom efficiency and product quality. The size used in warp yarn sizing mainly includes three categories: starch, PVA and acrylic size. "Use less or no PVA" has become one of the development trends of slurry. Grafted modified starch is considered to be one of the suitable size substitutes for PVA. Many pulp production plants and application plants are more concerned about some situations related to grafted modified starch. [0003] Polyvinyl alcohol (PVA)-based chemically synthesized slurry is generally used as the main adhesive for si...
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