Preparation method and use of cation guar gum graft copolymer retention and drainage agent

A technology of cationic guar gum and retention and drainage aids, applied in the system field, can solve problems such as uselessness, and achieve the effect of reducing white water turbidity, reducing mutual repulsion, and increasing mechanical properties

Inactive Publication Date: 2009-07-01
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, the aqueous graft copolymers of guar gum, hydroxypropyl guar gum and carboxymethyl guar gum and acrylamide integrate the advantages of natural polymers and synthetic polymers, and are used in the research of sewage flocculation treatment and heavy metal adsorbents There are many, but it has not been used in the wet end chemical process of papermaking, especially the aqueous solution graft polymerization technology of cationic guar gum and acrylamide, and its use as retention and drainage aid and strengthening agent in the papermaking process is still blank

Method used

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  • Preparation method and use of cation guar gum graft copolymer retention and drainage agent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] Disperse 100 grams of unpurified guar collagen powder into a mixture of 40 grams of alcohol and 10 grams of water, add it to an ordinary three-neck bottle, ventilate nitrogen, stir evenly at room temperature, add 10 grams of 3-chloro-2-hydroxypropyl Trimethyl ammonium chloride and the solution of 10 grams of water, dropwise add 10 grams of sodium hydroxide aqueous solution (sodium hydroxide concentration 50%), stir and mix evenly, then material is placed in 65 ℃ of constant temperature ovens and reacts after 3.5 hours, Cool to room temperature, neutralize the pH to 6-7 with a small amount of acetic acid, filter with suction, and dry the filter cake in a vacuum oven at 65°C for 12 hours to obtain a cationic guar gum product, with a cationic substitution degree of 0.015.

[0042] Take 10 grams of the above-mentioned product, dissolve it in 833 grams of distilled water to obtain a colorless transparent solution, feed into nitrogen and stir, add the nitric acid solution of c...

Embodiment 2

[0044] Disperse 100 grams of unpurified guar collagen powder into a mixture of 70 grams of alcohol and 10 grams of water, add it to an ordinary three-necked bottle, ventilate nitrogen, stir evenly at room temperature, add 25 grams of 3-chloro-2-hydroxypropyl Trimethyl ammonium chloride and the solution of 10 grams of water, add dropwise 50 grams of sodium hydroxide aqueous solution (sodium hydroxide concentration 10%), stir and mix evenly, then material is placed in 75 ℃ of constant temperature ovens and reacts after 6 hours, Cool to room temperature, neutralize the pH to 6-7 with a small amount of acetic acid, filter with suction, and dry the filter cake in a vacuum oven at 50°C for 24 hours to obtain a cationic guar gum product, with a cationic substitution degree of 0.036.

[0045] Take 10 grams of the above-mentioned product, dissolve it in 190 grams of distilled water to obtain a colorless transparent solution, feed into nitrogen and stir, add the nitric acid solution of c...

Embodiment 3

[0047] 100 grams of unpurified guar collagen powder, dispersed into a mixture of 20 grams of alcohol and 10 grams of water, added to a common three-necked bottle, ventilated with nitrogen, stirred evenly at room temperature, added 5 grams of 3-chloro-2-hydroxypropyl Trimethyl ammonium chloride and the solution of 10 grams of water, dropwise add 10 grams of aqueous sodium hydroxide solution (sodium hydroxide concentration 50%) and mix evenly at a high speed, then place the material in a constant temperature oven at 40°C to react for 6 hours, Cool to room temperature, neutralize the pH to 6-7 with a small amount of acetic acid, filter with suction, and dry the filter cake in a vacuum oven at 75°C for 10 hours to obtain a cationic guar gum product, with a cationic substitution degree of 0.008.

[0048] Take 10 grams of the above-mentioned product, dissolve it in 323 grams of distilled water to obtain a colorless transparent solution, feed into nitrogen and stir, add the nitric aci...

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Abstract

The invention discloses a preparation method and application of a cationic guar gum graft copolymer retention and drainage aid. The method is as follows: first disperse the unpurified guar collagen powder in low-carbon alcohol / water solution, pass nitrogen gas, stir evenly at room temperature, add the aqueous solution of cationic etherification agent, then drop strong base catalyst, and react at 40-75°C , to obtain a cationic guar gum product; then the resulting product is formulated into a colorless and transparent solution of cationic guar gum, adding an initiator, and a mixed aqueous solution of acrylamide and vinyl cationic monomer, and adding an auxiliary agent, and reacting at 10-65°C After 2-24 hours, a cationic guar gum graft copolymer retention and drainage aid is obtained. The method has the advantages of simple production process, low equipment investment, mild reaction conditions, and low production cost. The product is used as a retention and drainage aid in papermaking, which greatly improves the first-pass retention rate of fine components and can significantly improve the filtration of the wire section of the paper machine. Water-based, increase the dehydration speed in the press section, and improve the mechanical properties of paper products.

Description

technical field [0001] The invention relates to a preparation method of a multifunctional retention and drainage enhancer for paper pulp, which is suitable for wood pulp, waste paper pulp and straw pulp systems and systems aimed at producing high-grade functional paper. Background technique [0002] At present, the paper industry generally uses cationic acrylamide (CPAM) with a molecular weight of one million as a retention and drainage aid, but CPAM is not easy to biodegrade, and the residual monomers are very toxic, which limits its application in household paper and high-grade paper. Excessive CPAM will cause the charge reversal of the pulp system, greatly reduce the retention and drainage performance, and affect the formation of paper and the stable operation of the paper machine. Starch derivatives, especially cationic starches, have been widely recognized as drying and strengthening agents. However, due to the different sources of starch raw materials, various types, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J20/26B01J20/30
Inventor 万小芳李友明汪晓军王艳霞宋林林
Owner SOUTH CHINA UNIV OF TECH
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