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Preparation method of special modified hydroxypropyl methylcellulose for industrial grade ceramic tile series

A hydroxypropyl methylcellulose, an industrial-grade technology, which is applied in the field of preparation of modified hydroxypropyl methylcellulose for industrial-grade tile series, and can solve the problem that the preparation method of modified hydroxypropyl methylcellulose has not been found. Reporting and other issues, to achieve the effect of simple preparation method, stable viscosity, and improved open time

Active Publication Date: 2018-07-10
SHANGHAI HUIGUANG FINE CHEM IND CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] There is no report about the preparation method of a special modified hydroxypropyl methylcellulose for industrial grade ceramic tile series

Method used

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  • Preparation method of special modified hydroxypropyl methylcellulose for industrial grade ceramic tile series
  • Preparation method of special modified hydroxypropyl methylcellulose for industrial grade ceramic tile series
  • Preparation method of special modified hydroxypropyl methylcellulose for industrial grade ceramic tile series

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] The preparation of embodiment 1 hydroxypropyl methylcellulose pure product

[0034] A. Alkalization

[0035] Add cotton fiber with an average degree of polymerization of 1600-2000, aqueous sodium hydroxide solution with a mass concentration of 50-60% and hydrogen peroxide solution with a mass concentration of 25-35% into the reactor and stir continuously, wherein cotton fiber: aqueous sodium hydroxide solution: over The mass ratio of hydrogen peroxide solution is 1:(1.5-3.2):(1.5-2.5). After adding hydrogen peroxide, start the vacuum pump to make the pressure of the reactor reach -0.1mpa, and control the temperature during the stirring process at 40-60°C. The time is 30-80 minutes;

[0036] B. Etherification

[0037] Continuously add propylene oxide and methyl chloride into the reactor within 10-20 minutes, and then add a dimethyl ether solution with a mass concentration of 80-90%, wherein the mass ratio of cotton fiber to etherifying agent is 1: (1.6- 2.0), then the...

Embodiment 2

[0042] Put 1kg of hydroxypropyl methylcellulose pure product, 0.1kg of organic polymer and 0.03kg of special resin into the mixer at the same time to mix, mix evenly and then discharge, refer to JC / T2190-2013 standard for anti-slip and open time tests. See Table 1.

[0043] Table 1

[0044]

Embodiment 3

[0046] Put 1kg of hydroxypropyl methylcellulose pure product, 0.2kg of organic polymer and 0.05kg of special resin into the mixer at the same time to mix, mix evenly and discharge, refer to JC / T2190-2013 standard for anti-slip and open time tests. See Table 2.

[0047] Table 2

[0048]

[0049]

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Abstract

The invention relates to the field of production of hydroxypropyl methylcellulose (HPMC), particularly a modification preparation method of special modified HPMC for industrial-grade ceramic tile series, which comprises the following steps: simultaneously adding high-concentration sodium hydroxide, epoxypropane and methyl chloride into cotton fibers, vacuumizing, reacting for some time, and adding an etherifying agent to carry out etherification; and after the etherification reaction finishes, washing twice, removing the liquid, drying, pulverizing, adding a water-soluble synthetic organic high polymer and a special-type resin, and mixing to obtain the industrial-grade modified HPMC. The product provided by the invention has the advantages of higher substitution degree, favorable modification degree, clear HPMC solution and stable viscosity, and greatly enhances the opening time and sliding resistance of tile glue.

Description

technical field [0001] The invention relates to the field of hydroxypropyl methylcellulose production, in particular to a method for preparing specially modified hydroxypropyl methylcellulose for industrial-grade ceramic tile series. Background technique [0002] Hydroxypropyl methylcellulose (HPMC) is a non-ionic cellulose ether, white or milky white fibrous powder or granules, with a bulk density of 300-400kg / m 3 , almost odorless, tasteless, hygroscopic. Easily dispersed in water to form a transparent colloidal solution, insoluble in organic solvents such as ethanol. The pH of the 2% aqueous solution is 6.5-9.5, when the pH>10 or <5, the viscosity of the glue will decrease significantly, and the performance is the best when the pH=7. Stable to heat, the viscosity rises rapidly below 20°C, and changes slowly at 45°C, and heating for a long time above 80°C can denature the colloid and significantly reduce the viscosity and performance. It is easily soluble in water...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09J101/28C09J11/08C08B11/193C08B11/20C08B1/08
CPCC08B1/08C08B11/193C08B11/20C08L2205/03C09J11/08C09J101/284C08L33/26C08L71/02
Inventor 王健
Owner SHANGHAI HUIGUANG FINE CHEM IND CO LTD