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Preparation method of silicon modified double-component waterborne polyurethane composite coating for automobile varnish

A water-based polyurethane and composite coating technology, applied in the field of coatings, can solve the problems of consuming curing agent active groups, high cost of nano-zinc oxide, affecting curing effect, etc., to improve adhesion and water resistance, conducive to large-scale application, Beneficial for uniform dispersion

Active Publication Date: 2019-05-17
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the cost of nano zinc oxide is high, the Mohs hardness is low, and it consumes the active groups in the curing agent, which affects the curing effect

Method used

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  • Preparation method of silicon modified double-component waterborne polyurethane composite coating for automobile varnish
  • Preparation method of silicon modified double-component waterborne polyurethane composite coating for automobile varnish
  • Preparation method of silicon modified double-component waterborne polyurethane composite coating for automobile varnish

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] 18 parts of methyl methacrylate, 10 parts of butyl acrylate, 10 parts of styrene, 4 parts of β-hydroxyethyl methacrylate, 1 part of acrylic acid, and emulsifier 1.3 parts of sodium lauryl sulfate, 0.7 parts of Tween 80 was added to the beaker, and then 20mL of distilled water was added, and magnetically stirred for 0.5-1h until it was completely emulsified. Add 0.13 parts of potassium persulfate, 0.05 parts of sodium bicarbonate and 10 mL of distilled water into a three-necked flask equipped with a stirring paddle and a condenser, heat and stir to 75 ° C under nitrogen gas atmosphere, then take 1 / 3 of the pre-emulsion, and use peristaltic The pump drips into the flask, and the dripping is completed within 1 to 1.5 hours, then the temperature is raised to 80°C and kept for 1 hour. Then add 0.25 parts of potassium persulfate at the same time, and drop the remaining 2 / 3 of the pre-emulsion into the flask through a peristaltic pump, drop it in 2-2.5 hours and keep it warm f...

Embodiment 2

[0047] 18 parts of methyl methacrylate, 10 parts of butyl acrylate, 10 parts of styrene, 1 part of acrylic acid, 4 parts of β-hydroxyethyl methacrylate, and 1.3 parts of emulsifier sodium lauryl sulfate, 0.7 parts of Tween 80 was added to the beaker, and then 20mL of distilled water was added, and magnetically stirred for 0.5-1h until it was completely emulsified. Add 0.13 parts of potassium persulfate, 0.05 parts of sodium bicarbonate and 10 mL of distilled water into a three-necked flask equipped with a stirring paddle and a condenser, heat and stir to 75 ° C under nitrogen gas atmosphere, then take 1 / 3 of the pre-emulsion, and use peristaltic The pump drips into the flask, and the dripping is completed within 1 to 1.5 hours, then the temperature is raised to 80°C and kept for 1 hour. Then add 0.25 parts of potassium persulfate at the same time, and drop 1.7 parts of self-made polysiloxane with double bonds and the remaining 2 / 3 pre-emulsion into the flask through a peristal...

Embodiment 3

[0049] 18 parts of methyl methacrylate, 10 parts of butyl acrylate, 10 parts of styrene, 1 part of acrylic acid, 4 parts of β-hydroxyethyl methacrylate and emulsifier 1.3 parts of sodium lauryl sulfate, 0.7 parts of Tween 80 Add it to a beaker, then add 20mL of distilled water, and stir magnetically for 0.5-1h until it is completely emulsified. Add 0.13 parts of potassium persulfate, 0.05 parts of sodium bicarbonate and 10 mL of distilled water into a three-necked flask equipped with a stirring paddle and a condenser, heat and stir to 75 ° C under nitrogen gas atmosphere, then take 1 / 3 of the pre-emulsion, and use peristaltic The pump drips into the flask, and the dripping is completed within 1 to 1.5 hours, then the temperature is raised to 80°C and kept for 1 hour. Then add 0.25 parts of potassium persulfate at the same time, drop 3 parts of self-made polysiloxane with double bonds and the remaining 2 / 3 pre-emulsion into the flask through a peristaltic pump, drop it in 2-2.5...

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Abstract

The invention discloses silicon modified double-component waterborne polyurethane composite coating for automobile varnish and a preparation method thereof. The composite coating is prepared from a component A and a component B, wherein the component A is silicon modified waterborne polyacrylate emulsion; the component B comprises a hydrophilic isocyanate curing agent, graphene and an auxiliary agent; the silicon modified waterborne polyacrylate emulsion contains methyl methacrylate, butyl acrylate, styrene, acrylic acid, a copolymer of beta-hydroxyethylmethacrylate and polysiloxane with double bonds, and silane modified silicon dioxide nanoparticles. According to the composite coating, the polysiloxane, silicon dioxide nanoparticles and the graphene are uniformly introduced into matrix resin, so that the attachment force and the water resistance of the composite coating are effectively improved; meanwhile, the hardness and the strength are increased and the composite coating is especially suitable for the automobile varnish.

Description

technical field [0001] The invention relates to a coating, in particular to an organosilicon-modified two-component water-based polyurethane composite coating for automobile varnish and a preparation method thereof, belonging to the technical field of coatings. Background technique [0002] Two-component waterborne polyurethane coatings generally consist of a polyol emulsion or dispersion component and a hydrophilic-modified isocyanate curing agent component. Water-based polyhydroxy polyacrylate has the characteristics of abundant raw material sources, relatively low cost, and good environmental protection, especially its coating film has excellent properties such as weather resistance, mechanical strength, gloss and permeability, and is an ideal polypolyol Lotion type. After it is made into a paint with a hydrophilic modified isocyanate curing agent, the urethane bond, urea bond, biuret and ester group contained in the polyurethane structure endow the polyurethane coating ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D175/04C09D183/04C09D7/62C08F220/14C08F220/18C08F212/08C08F220/20C08F220/06
Inventor 周涛戴安琪蒋伟滨
Owner CENT SOUTH UNIV
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