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Carboxymethyl hydroxyethyl methyl cellulose ether and preparation method thereof

A technology of carboxymethyl hydroxyethyl methyl and cellulose ether, which is applied in the field of cellulose ether preparation, can solve problems such as increasing the cost of CMHEC, achieve excellent fluidity, reduce production costs, and increase the application range

Inactive Publication Date: 2016-03-09
SHANDONG YITENG NEW MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the washing and purification of CMHEC must be prepared in a certain concentration of alcohol aqueous solution (discussed in US Patent US2517577 and Chinese Patent CN1673233A), which increases the cost of CMHEC

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] 1. Crush 200kg of cellulose raw material to 80 mesh, put it into 2400kg of inert solvent, add 150kg of 50% lye to alkalize for 2 hours;

[0015] 2. Add 150kg ethylene oxide and 200kg methyl chloride, etherify at 65°C for 2 hours, then raise the temperature to 80°C for 1 hour;

[0016] 3. Drop below 25°C and add 100kg of chloroacetic acid, and etherify at 75°C for 0.5 hours;

[0017] 4. Cool down to below 50°C, add an appropriate amount of glacial acetic acid to completely neutralize;

[0018] 5. After recovering the solvent from the neutralized material, add 7 times hot water to wash, separate and dry;

[0019] 6. After crushing and packaging, the finished product is obtained.

Embodiment 2

[0021] 1. Crush 200kg of cellulose raw material to 80 mesh, put it into 2600kg of inert solvent, add 200kg of 50% lye to alkalize for 1.5 hours;

[0022] 2. Add 120kg ethylene oxide and 20kg methyl chloride, etherify at 50°C for 2 hours, then raise the temperature to 85°C for 1 hour;

[0023] 3. Drop below 25°C and add 150kg of chloroacetic acid, and etherify at 70°C for 1 hour;

[0024] 4. Cool down to below 50°C, add an appropriate amount of glacial acetic acid to completely neutralize;

[0025] 5. After recovering the solvent from the neutralized material, add 10 times hot water to wash, separate and dry;

[0026] 6. After crushing and packaging, the finished product is obtained.

Embodiment 3

[0028] 1. Crush 200kg of cellulose raw material to 60 mesh, put it into 1400kg of inert solvent, add 150kg of 35% lye to alkalize for 0.5 hours;

[0029] 2. Add 300kg ethylene oxide and 300kg methyl chloride, etherify at 70°C for 1 hour, then raise the temperature to 70°C for 1 hour;

[0030] 3. Add 10kg of chloroacetic acid when it drops below 25°C, and etherify at 75°C for 0.8 hours;

[0031] 4. Cool down to below 50°C, add an appropriate amount of glacial acetic acid to completely neutralize;

[0032] 5. After recovering the solvent from the neutralized material, add 8 times hot water to wash, separate and dry;

[0033] 6. After crushing and packaging, the finished product is obtained.

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PUM

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Abstract

The invention relates to a carboxymethyl hydroxyethyl methyl cellulose ether and a preparation method thereof. The substituent groups of the carboxymethyl hydroxyethyl methyl cellulose ether prepared in the invention are a carboxymethyl group, a hydroxyethyl group and a methyl group. The above prepared novel cellulose mixed ether simultaneously has the use performances of hydroxyethyl methyl cellulose (HEMC) and carboxymethyl hydroxyethyl cellulose (CMHEC); and the above product has above three groups, and hydrophobic, hydrophilic, ionic and nonionic groups are well fused in the product, so the product has excellent fluidity, water retention property, salt resistance and enzyme resistance. The methyl group exists, so the product can be washed in hot water, thereby the production cost is greatly reduced, and the application range is widened. The carboxymethyl hydroxyethyl methyl cellulose ether can be applied in the oil drilling industry, the building material industry, the weaving industry, the printing and dyeing industry and the toothpaste industry.

Description

technical field [0001] The invention relates to the field of cellulose ether preparation, in particular to a carboxymethyl hydroxyethyl methyl cellulose ether and a preparation method thereof. technical background [0002] The more common mixed cellulose ethers in the market include HPMC, HEMC, EHEC, CMHEC, etc. Among them, carboxymethyl hydroxyethyl cellulose CMHEC is an ionic and non-ionic mixed ether, which has excellent solubility, enzyme resistance, temperature resistance, and salt tolerance, and can be stable in a wide range of pH values. Therefore, it is widely used in industries such as oil drilling, building materials, textiles, printing and dyeing, papermaking and toothpaste. However, the washing and purification of CMHEC must be prepared in a certain concentration of alcohol aqueous solution (discussed in US Patent US2517577 and Chinese Patent CN1673233A), which increases the cost of CMHEC. If CMHEC can be washed in hot water, it will undoubtedly improve the pur...

Claims

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Application Information

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IPC IPC(8): C08B11/193
CPCC08B11/193
Inventor 张双剑凡俊琳李长胤赵洪山
Owner SHANDONG YITENG NEW MATERIAL CO LTD