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Preparation method of thickening agent for salt-resisting and high-suspension coating

A technology of high suspension and thickener, applied in the direction of coating, etc., can solve the problems of incapable of weakening the hydration of emulsion particles in water-based coatings, poor suspension stability, poor salt resistance of thickeners, etc.

Inactive Publication Date: 2018-11-23
FOSHAN LINGCHAO NEW MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The technical problem mainly solved by the present invention is that the traditional thickeners of current water-based paints are mainly common organic water-soluble polymer materials, which cannot weaken the hydration of emulsion particles in water-based paints, resulting in poor salt resistance of the thickeners. The defect of poor suspension stability provides a method for preparing a thickener for salt-resistant high-suspension coatings

Method used

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  • Preparation method of thickening agent for salt-resisting and high-suspension coating

Examples

Experimental program
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Effect test

example 1

[0029] Add 150mL epichlorohydrin to a three-necked flask with a stirrer and a ventilation tube, place the three-necked flask in an ice-water bath, pass trimethylamine gas into the three-necked flask at a ventilation rate of 40mL / min, start the agitator, and Stir at a speed of 1 / min, ventilate for 4 hours, filter and separate to obtain a white solid product, put it in a vacuum drying oven with a set temperature of 70°C, and dry for 6 hours to obtain a cationic etherification agent; add 30 g of hydroxyethyl cellulose to the reactor element, 120mL of sodium hydroxide solution with a mass fraction of 15% and 8 g of cationic etherification agent, stirred for 1 hour to obtain a reaction product, and neutralized the reaction product with 20% hydrochloric acid to obtain a suspension, which was placed in Centrifuge in a high-speed centrifuge at a speed of 2000r / min for 8min, remove the supernatant, collect the sediment in the lower layer, put the sediment in an oven with a set temperatu...

example 2

[0031] Add 155mL of epichlorohydrin to a three-necked flask with a stirrer and a ventilation tube, place the three-necked flask in an ice-water bath, pass trimethylamine gas into the three-necked flask at a ventilation rate of 45mL / min, start the agitator, and Stir at a speed of 1 / min, ventilate and react for 4 hours, filter and separate to obtain a white solid product, put it in a vacuum drying oven with a set temperature of 75°C, and dry for 6 hours to obtain a cationic etherification agent; add 33g of hydroxyethyl cellulose to the reactor element, 130mL of sodium hydroxide solution with a mass fraction of 15% and 9g of cationic etherification agent, stirred and reacted for 1h to obtain a reaction product, neutralized the reaction product with 20% hydrochloric acid to obtain a suspension, and placed the suspension in Centrifuge in a high-speed centrifuge at a speed of 2500r / min for 9min, remove the supernatant, collect the sediment in the lower layer, and dry the sediment in ...

example 3

[0033]Add 160mL of epichlorohydrin to a three-necked flask with a stirrer and a ventilation tube, place the three-necked flask in an ice-water bath, pass trimethylamine gas into the three-necked flask at a ventilation rate of 50mL / min, start the agitator, and Stir at a speed of 1 / min, ventilate and react for 5 hours, filter and separate to obtain a white solid product, put it in a vacuum drying oven with a set temperature of 80°C, and dry for 7 hours to obtain a cationic etherification agent; add 35g of hydroxyethyl cellulose to the reactor element, 140mL of sodium hydroxide solution with a mass fraction of 15% and 10g of cationic etherification agent, stirred and reacted for 2 hours to obtain a reaction product, neutralized the reaction product with 20% hydrochloric acid to obtain a suspension, and placed the suspension in Centrifuge in a high-speed centrifuge at a speed of 3000r / min for 10 minutes, remove the upper layer, collect the lower sediment, put the sediment in an ove...

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Abstract

The invention belongs to the technical field of preparation of thickening agents and in particular relates to a preparation method of a thickening agent for salt-resisting and high-suspension coating.According to the preparation method, amphoteric cellulose ether can be used for effectively weakening and stopping free water molecules in the waterborne coating from being hydrated on surfaces of coating grains and pigment, so that the viscosity of the coating is improved and the pigment is prevented from being precipitated; an electrostatic acting force in a molecular chain in the thickening agent for the coating is only an electrostatic attraction force so that a polymer molecule is shrunk and a hydrodynamic volume is reduced; a carrier of the thickening agent is cellulose viscose and canbe rapidly hydrated with the water molecules through a hydrogen bond; the standing viscosity of the waterborne coating is improved through the winding of fiber molecules; a lot of cation groups have arelatively good repelling effect on metal cations and a condition that a higher molecular weight surface water film is damaged by heavy metal ions in the pigment of the waterborne coating can be avoided, so that the thickening agent has good salt-resisting performance and has a wide application prospect.

Description

technical field [0001] The invention belongs to the technical field of thickener preparation, and in particular relates to a preparation method of a thickener for salt-resistant high-suspension coatings. Background technique [0002] Modern architecture, construction, and home decoration are all inseparable from coatings and paints. The use of coatings is not only for decoration, but also can effectively protect the base material and prolong the service life of buildings and equipment. Water-based paint is a kind of paint with low pollution, energy saving and resource saving. With the strengthening of people's awareness of environmental protection, water-based coatings are increasingly valued by people, and related products have been extensively researched and developed. Water-based paint is generally formed by the dispersion of resin emulsion particles and pigment suspension particles through the interaction force between particles. The viscosity of the paint is a charac...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D7/44C08B11/193C08B9/00
CPCC08B9/00C08B11/193C09D7/44
Inventor 裘友玖邓博陈帅
Owner FOSHAN LINGCHAO NEW MATERIAL CO LTD
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