Dispersant for waterborne paint

A water-based paint and dispersant technology, applied in the direction of coating, can solve the problems of insignificant dispersion effect and low efficiency, and achieve the effect of improving the dispersion effect, reducing the surface tension and enhancing the wetting effect.

Active Publication Date: 2016-02-03
宣城市聚源精细化工有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, many dispersants produced on the existing market have no obvious dispersion effect and low efficiency

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0017] A water-based paint dispersant, made of the following components in parts by weight, 15 parts of acrylic acid, 15 parts of methyl methacrylate, 2 parts of white carbon black, 10 parts of ethylene glycol, 60 parts of organic solvent, 1 part of n-amyl alcohol part, 3 parts of malonic acid, 2 parts of initiator, 4 parts of sodium sulfite, 4 parts of neutralizing agent; It is made by the following production steps:

[0018] 1) Add an organic solvent to the reaction kettle, heat it to 65-70°C, and treat it at a constant temperature for 1-1.5 hours, then add acrylic acid and methyl methacrylate, add an initiator at a pressure of 6-10Mpa and 95-100°C, and react 8-9 hours;

[0019] 2) React n-pentanol, malonic acid and white carbon black with nitrogen at 55-60°C and 15-18MPa pressure for 40-45 minutes;

[0020] 3) Mix the raw materials obtained in 1) and 2), add ethylene glycol when heated to 60°C, add sodium sulfite when the temperature rises to 85°C, stop heating when the te...

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Abstract

The invention discloses a dispersant for a waterborne paint. The dispersant is prepared from the following components: acrylic acid, methyl methacrylate, white carbon black, glycol, an organic solvent, n-amyl alcohol, propane diacid, an initiator, sodium hydrosulphite and a neutralizer. The dispersant provided by the invention can reduce surface tension of the waterborne paint, improves wetting effect on pigment particles, allows the pigment particles to be stably dispersed in a liquid phase, can rapidly and firmly bond with surface groups of the paint and enables the pigment particles to stably suspend in a hydrosolvent so as to allow pigment to be well dispersed, thereby achieving optimal dispersion effect; and through addition of white carbon black, the effect and speed of dispersion are improved. During preparation of the dispersant, the initiator is added in multiple steps instead of one step in the prior art, so the molecular weight of resultant and product distribution are changed, and the prepared dispersant has good dispersion performance and good capability of tolerating changes of environment temperature.

Description

technical field [0001] The invention relates to the field of chemicals, in particular to a water-based paint dispersant. Background technique [0002] Dispersant is a kind of surface active agent with two opposite properties of lipophilicity and hydrophilicity in the molecule, which can uniformly disperse the solid particles of inorganic and organic pigments that are difficult to dissolve in liquid, and prevent the solid particles from settling and agglomerating. With the improvement of people's requirements for health and environmental protection, water-based environmental protection coatings have become the new favorite in the field of architectural decoration. However, the surface tension of water is much larger than that of organic solvents, so it is necessary to add some additives to reduce the surface tension of water, enhance the wetting effect on the pigment particles, and make the pigment particles disperse stably in the liquid phase. However, many dispersants prod...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D7/12C08F220/06C08F220/14C08K3/36
Inventor 程聚光
Owner 宣城市聚源精细化工有限公司
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