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Preparation method of hydroxypropyl methyl cellulose ether with high gelation temperature

A technology of hydroxypropyl methylcellulose and high gel, which is applied in the field of preparation of hydroxypropyl methylcellulose ether, can solve problems such as product instability, low gel temperature, and poor product uniformity, and achieve the goal of reaction process The effect of short time consumption, good uniformity and mild reaction conditions

Inactive Publication Date: 2019-07-02
北京博润佳科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to solve the shortcoming existing in the prior art, and propose a kind of preparation method of the hydroxypropyl methyl cellulose ether of high gel temperature, thereby effectively solve the poor uniformity of the product in the prior art, the product is uneven Stable and low gel temperature defects, to ensure that the mortar still has good water retention and mortar viscosity during high temperature construction, so as to ensure the strength of the mortar and prevent hollowing from cracking and powder dropping

Method used

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  • Preparation method of hydroxypropyl methyl cellulose ether with high gelation temperature

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Embodiment 1

[0027] The invention discloses a preparation method of hydroxypropyl methyl cellulose ether with high gel temperature, and the specific steps are as follows:

[0028] (1) Alkalization

[0029] adding cellulose powder into the alkalization kettle for alkalization;

[0030] (2), etherification

[0031] First heat up reaction and then low temperature reaction, carry out two-step etherification;

[0032] (3), adjust acid

[0033] Neutralization and regulation to achieve acid regulation;

[0034] (4), post-processing

[0035] After pulverization, add a crosslinking modifier of 3% by weight of cellulose powder to the system, and stir for 15 minutes at a temperature of 60°C.

[0036] In the step (1), the cellulose powder is wood pulp powder.

[0037] In the step (2), the temperature of the heating reaction is 80°C, the reaction time is 2h, and the first step of etherification is performed, and then the temperature of the low temperature reaction is 50°C, and the reaction time i...

Embodiment 2

[0044] The invention discloses a preparation method of hydroxypropyl methyl cellulose ether with high gel temperature, and the specific steps are as follows:

[0045] (1) Alkalization

[0046] adding cellulose powder into the alkalization kettle for alkalization;

[0047] (2), etherification

[0048] First heat up reaction and then low temperature reaction, carry out two-step etherification;

[0049] (3), adjust acid

[0050] Neutralization and regulation to achieve acid regulation;

[0051] (4), post-processing

[0052] After pulverization, add a crosslinking modifier of 2% by weight of cellulose powder to the system, and stir for 30 minutes at a temperature of 55°C.

[0053] In the step (1), the cellulose powder is wood pulp powder.

[0054] In the step (2), the temperature of the heating reaction is 90°C, the reaction time is 2.5h, the first step etherification is performed, and then the temperature of the low temperature reaction is 40°C, and the reaction time is 3.5...

Embodiment 3

[0061] The invention discloses a preparation method of hydroxypropyl methyl cellulose ether with high gel temperature, and the specific steps are as follows:

[0062] (1) Alkalization

[0063] adding cellulose powder into the alkalization kettle for alkalization;

[0064] (2), etherification

[0065] First heat up reaction and then low temperature reaction, carry out two-step etherification;

[0066] (3), adjust acid

[0067] Neutralization and regulation to achieve acid regulation;

[0068] (4), post-processing

[0069] After crushing, add 4.0% by weight of cellulose powder crosslinking modifier to the system, and stir for 30 minutes at a temperature of 50-70 °C.

[0070] In the step (1), the cellulose powder is wood pulp powder.

[0071] In the step (2), the temperature of the heating reaction is 70°C and the reaction time is 2h, the first step of etherification is performed, and then the temperature of the low temperature reaction is 60°C and the reaction time is 4h, ...

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Abstract

The invention discloses a preparation method of hydroxypropyl methyl cellulose ether with a high gelation temperature. The method concretely comprises the following steps: cellulose powder is added into an alkalization kettle, and is alkalized; the alkalized cellulose powder undergoes a heating reaction, and then undergoes a low-temperature reaction to achieve two-step etherification; the obtainedmaterial is neutralized to achieve acid adjustment; and the neutralized material is crushed, a crosslinking modifier accounting for 1.0-4.0% of the weight of the cellulose powder is added to the system, and stirring is carried out at a temperature of 50-70 DEG C for 10-30 min. The method allows the hydroxypropyl methyl cellulose ether with high water retention to be prepared, and the obtained hydroxypropyl methyl cellulose product has a good uniformity, and can significantly improve the water retention capacity of a mortar when applied to high temperature weather and the high temperature mortar; and the method has the advantages of no special reaction devices, mild reaction conditions, and short time in the reaction process.

Description

technical field [0001] The invention relates to the technical field of preparation of building additives, in particular to a preparation method of hydroxypropyl methyl cellulose ether with high gel temperature. Background technique [0002] In dry mix mortar, cellulose ether is one of the essential additives. When cellulose ether is added to the dry-mixed mortar, the mixed cement mortar will have high water retention and good viscosity increasing effect, so that the cement mortar can maintain enough water for a long time. During mixing and construction, water acts as a lubricant and solvent between the inorganic components, so thin-layer mortar can be combed, and plastering mortar can be spread with a trowel. At the same time, in the construction process of mortar, due to the increase in water retention after adding cellulose ether, pre-wetting is not required for walls or ceramic tiles that are easy to absorb water, and the workability and workability of mortar are greatly...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08B11/20C08B11/193C08B15/00
CPCC08B11/193C08B11/20C08B15/005
Inventor 董慧艳吴梓红王小梅姚超超许小草王建荣
Owner 北京博润佳科技有限公司