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Production method of carboxymethyl cellulose acetate butyrate

A technology of carboxymethyl cellulose and sodium carboxymethyl cellulose, which is applied in the production field of carboxymethyl cellulose acetate butyrate, can solve the problem that the intermolecular force increases hydrogen bond force, cannot prepare CMCAB, and is disadvantageous. Esterification reaction and other problems, to achieve the effect of low production process temperature, short production cycle and simple operation process

Active Publication Date: 2016-03-23
CHONGQING LIHONG FINE CHEM +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The CMC prepared by the traditional kneader, due to the strong shear force of the kneader, the CMC fiber bundles and fiber microfibers are in a tight state, the distance between the bundles is further shortened, and the intermolecular forces, especially the hydrogen bond forces, increase Large, not conducive to esterification reaction
In fact, almost no CMCAB can be prepared from CMC prepared by kneader

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033](1) Preparation of CMC-Na: The performance index of the prepared CMC-Na is: DS=0.12, moisture content 5.3%, purity 99.0%. Disperse 80g of refined cotton powder in isopropanol / water solution, the mass ratio of isopropanol to water is 20.0:1, and the mass ratio of solution to refined cotton powder is 16.5:1. Exclude the air in the reactor, fill it with inert gas, and then add 84.0g of 25%wt NaOH aqueous solution at 10°C to 20°C for alkalization for 1.5h; after alkalization, reduce the temperature of the reaction system to about 10°C, Slowly add 42.9g of 56.0%wt monochloroacetic acid / isopropanol solution for 15-20min, then raise the temperature to 50°C for etherification for 1.5h, then continue to raise the temperature to 75°C for 30min, add 18.0g of 50%wt acetic acid / water solution Neutralize, wash 2-3 times with 85% v / v alcohol / water solution, dry, pulverize and set aside.

[0034] (2) Preparation of CMC-H: Submerge 44.8g of CMC-H in the acidifying solution for acidifica...

Embodiment 2

[0039] (1) Preparation of CMC-Na: The performance index of the prepared CMC-Na is: DS=0.23, moisture content 5.3%, purity 99.0%. Disperse 80g of refined cotton powder in isopropanol / water solution, the mass ratio of isopropanol to water is 14.0:1, and the mass ratio of solution to refined cotton powder is 16.8:1. Exclude the air in the reactor, fill it with inert gas, then add 120.0g of 25%wt NaOH aqueous solution at 10°C to 20°C, and alkalize for 1.5h; after alkalization, reduce the temperature of the reaction system to about 10°C, Slowly add 58.9g of 56.0%wt monochloroacetic acid / isopropanol solution for 15-20min, then raise the temperature to 50°C for etherification for 1.5h, then continue to raise the temperature to 75°C for 30min, add 22.0g of 50%wt acetic acid / water solution Neutralize, wash 2-3 times with 75% v / v alcohol / water solution, dry, pulverize and set aside.

[0040] (2) Preparation of CMC-H: Submerge 50.0g of CMC-H in the acidifying solution for acidification,...

Embodiment 3

[0045] (1) Preparation of CMC-Na: The performance index of the prepared CMC-Na is: DS=0.35, moisture content 5.3%, purity 99.0%. Disperse 80g of refined cotton powder in isopropanol / water solution, the mass ratio of isopropanol to water is 11.6:1, and the mass ratio of solution to refined cotton powder is 17.1:1. Exclude the air in the reactor, fill it with inert gas, then add 144.0g of 25%wt NaOH aqueous solution at 10°C to 20°C, and alkalize for 1.5h; Slowly add 75.0g of 56.0%wt monochloroacetic acid / isopropanol solution for 15-20min, then raise the temperature to 50°C for etherification for 1.5h, then continue to raise the temperature to 75°C for 30min, add 26.0g of 50%wt acetic acid / water solution Neutralize, wash 2-3 times with 75% v / v alcohol / water solution, dry, pulverize and set aside.

[0046] (2) Preparation of CMC-H: Submerge 49.4g of CMC-H in the acidifying solution for acidification, the temperature is 20°C, acidify for 30min, the mass ratio of acidifying solutio...

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Abstract

The invention discloses a production method of carboxymethyl cellulose acetate butyrate and aims to provide a continuous production process of carboxymethyl cellulose acetate butyrate that overcomes the existing difficulty that carboxymethyl cellulose acetate prepared by a traditional kneader method is inapplicable to the preparation of carboxymethyl cellulose acetate butyrate. The production method includes sodium carboxymethyl cellulose preparation, acidification, activation, esterification and purification. The production method has a short production period, the temperature is low, unit energy consumption is low, loss of raw materials is low, an operating process is simple, and manufacturing cost is greatly reduced; waterborne overlay coatings prepared based on the carboxymethyl cellulose acetate butyrate meet the requirement on environmental protection, are less harmful to the environment and human body and have excellent performance, and in the face of the requirement of automobile and aviation industries expanding day by day on waterborne overlay coatings, the carboxymethyl cellulose acetate butyrate has a promising application prospect and can also be made into different types of products according to different requirements, meeting requirements of a wider range.

Description

technical field [0001] The invention relates to a preparation method of a water-based paint leveling agent material in the field of natural polymer chemical modification, in particular to a production method of carboxymethyl cellulose acetate butyrate. Background technique [0002] In recent years, the automobile and aviation industries have developed rapidly, and related industries have also been greatly stimulated. Among them, water-based finish paint is an indispensable product for the maintenance, anticorrosion and beautification of automobiles and aviation products. At the same time, it meets the higher requirements of the society for environmental protection, and its application scope is expanding day by day. A key problem that needs to be solved for water-based finishes is the compatibility of water and oily materials and metal powders. Most water-based finishes require some organic materials as matrix film-forming substances, and nano-TiO 2 In addition, many metal f...

Claims

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Application Information

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IPC IPC(8): C08B3/18C08B11/12C08B1/08C09D7/06C09D7/47
Inventor 邵自强段洪涛周振文赵明李友琦何玉明陈静
Owner CHONGQING LIHONG FINE CHEM
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