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A kind of glyoxal cross-linked polymer modified high amylopectin and its preparation method and application

A technology of high amylopectin and cross-linked polymers, applied in textiles and papermaking, coatings, paper coatings, etc., can solve problems such as limited strength indicators such as bursting strength, reduced dehydration rate of wet paper webs, and difficulties in white water closed circulation. Achieve a good paper enhancement effect, improve the first-pass retention rate, and improve the system retention rate

Active Publication Date: 2017-08-01
HEFEI MAITUO NEW MATERIAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the modified starch-based dry strength agents in the prior art have high cost and limited strength indicators such as improving folding endurance, ring compressive strength, and bursting strength.
In addition, the paper machine system uses a large amount of starch as a reinforcing agent for a long time. Due to the low retention rate, it pollutes the white water of the paper machine and makes it difficult to close the white water cycle.
Another shortcoming of the dry strength agent of the modified starch of prior art is that while increasing the dry strength of the paper, it causes the operation of the paper machine, especially for the speed of the large-scale high-speed paper machine, due to the reduction of the dehydration rate of the wet paper web. influences

Method used

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  • A kind of glyoxal cross-linked polymer modified high amylopectin and its preparation method and application
  • A kind of glyoxal cross-linked polymer modified high amylopectin and its preparation method and application
  • A kind of glyoxal cross-linked polymer modified high amylopectin and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

specific Embodiment 1

[0031] This example provides a preparation method for glyoxal cross-linked polymer modified high amylopectin, the main raw materials used and the amount of feed are shown in the following table:

[0032]

[0033] The preparation method comprises the following steps:

[0034] In a 20 L reactor equipped with a stirrer, a thermometer, and a reflux condenser, mix 1275 g of tapioca starch and soft water in a mass ratio of 6.25:100, and heat the reactor to 120°C and stir until the tapioca starch is completely dissolved. , and then lower the temperature to below 60°C.

[0035] Take out the cassava starch solution and add it to a 2000ml flask equipped with a turbine stirrer and an RTD temperature sensor. Add polyacrylamide homopolymer (molecular weight: 10,000 Daltons) 135 g, polydimethyldiallyl ammonium chloride homopolymer (molecular weight 10,000 Daltons) 15 g, tetrasodium diphosphate decahydrate 30 g, glyoxal 30 g, stir well and add appropriate amount of sodium hydroxide and ...

specific Embodiment 2

[0041] This example provides a preparation method for glyoxal cross-linked polymer modified high amylopectin, the main raw materials used and the amount of feed are shown in the following table:

[0042]

[0043] The preparation method comprises the following steps:

[0044] In a 20L reactor equipped with a stirrer, a thermometer, and a reflux condenser, mix 1275 g of waxy cornstarch and soft water in a mass ratio of 6.25:100, and heat the reactor to 120°C and stir until the waxy cornstarch is completely Dissolve, and then cool down to below 60°C.

[0045] Take out the waxy corn starch solution and add it to a 2000ml flask equipped with a turbo stirrer and an RTD temperature sensor. Add polyacrylamide homopolymer (molecular weight: 10,000 Daltons) at a stirring speed of 120 RPM and a temperature of 40°C. 135g, polydimethyldiallyl ammonium chloride homopolymer (molecular weight 10,000 Daltons) 15g, tetrasodium diphosphate decahydrate 30g, glyoxal 30g, stir well and add appr...

specific Embodiment 3

[0051] The monomer of polyacrylamide in specific example 1 is replaced by one selected from acrylamide, N,N-dimethylacrylamide, N,N-diethylacrylamide, N-vinylformamide or A variety of nonionic monomers; the monomer of polydimethyldiallyl ammonium chloride in specific embodiment 2 is replaced by dimethyldiallyl ammonium chloride, dimethylaminoethyl acrylate Methyl chloride quaternary ammonium salt, dimethylaminoethyl methacrylate methyl chloride quaternary ammonium salt, diethylaminoethyl acrylate methyl chloride quaternary ammonium salt, diethylaminoethyl methacrylate methyl quaternary ammonium chloride, quaternary methyl chloride of dimethylaminopropyl acrylamide, quaternary methyl chloride of dimethylaminopropyl methacrylamide, benzyl quaternary chloride of dimethylaminoethyl acrylate Ammonium salt, benzyl chloride quaternium of dimethylaminoethyl methacrylate, benzyl chloride quaternium of diethylaminoethyl methacrylate, benzyl chloride quaternium of diethylaminoethyl metha...

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Abstract

The invention discloses a highly-branched starch modified by glyoxal crosslinked polymer. The starch comprises highly-branched starch, a polymer (A), which is used to form a polymer carbon skeleton and is prepared through nonionic monomer pre-polymerization, and a polymer (B), which is used to introduce positive charges and is prepared through positive ion pre-polymerization; and the highly-branched starch, the polymer (A) and the polymer (B) carry out crosslinking reactions in the presence of glyoxal so as to generate block copolymerized modified highly-branched starch; wherein the nonionic monomers are selected from acrylamide, N,N-dimethyl acrylamide, N,N-diethyl acrylamide, acrylonitrile, and the like, and the positive ion monomers are selected from dimethyl diallyl ammonium chloride, methyl chloride of dimethyl amino ethyl acrylate and diethyl amino ethyl acrylate, quaternary ammonium salt of benzyl chloride, and the like. The invention also provides an application of the highly-branched starch as a papermaking additive, which can be added into the wet part of a papermaking machine.

Description

technical field [0001] The invention relates to glyoxal cross-linked polymer modified high amylopectin and its preparation method and application, belonging to the technical field of polymer modified industrial additives and its preparation and application. Background technique [0002] In my country's papermaking industry raw materials, due to the shortage of wood resources, various types of recycled paper are currently used as papermaking raw materials in large quantities. Due to the increase in the number of recycling of these raw materials, the fibers are short, which seriously affects the strength of the paper and cardboard. It is necessary to add a dry strength agent during the papermaking process to increase the strength index of the paper. Among the currently used dry strength agents, modified starch dry strength agents almost occupy most of the market share. For example, various modified starches described in Chinese patents CN102121207A, CN102603977A, CN103015263A...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08B35/00C08B31/00D21H19/14
Inventor 赵迎辉
Owner HEFEI MAITUO NEW MATERIAL TECH CO LTD
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