Unlock instant, AI-driven research and patent intelligence for your innovation.

Preparation method for waterborne polyurethane applied to elastic coating

A water-based polyurethane and elastic coating technology, applied in the direction of polyurea/polyurethane coatings, coatings, etc., can solve the problems of two-component polyurethane construction and use, elastic acrylate hot sticking and cold brittleness, etc. Easy to stick and stain, improve water white resistance, and solve the effect of hot sticking and cold brittleness

Inactive Publication Date: 2012-06-13
FIRST NEW MATERIAL TECH DEV
View PDF6 Cites 22 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The embodiment of the present invention provides a method for preparing water-based polyurethane for elastic coatings, which solves the problems of elastic acrylate hot stickiness, cold brittleness and troublesome construction and use of two-component polyurethane

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0013] The embodiment of the present invention provides a kind of preparation method for the waterborne polyurethane of elastic coating, and this method comprises:

[0014] The raw materials are macromolecular polyols, diisocyanates, polyethylene glycol, hydroxyl-containing hydrophilic monomers, small-molecule hydroxyl-terminated chain extenders, organic solvents, neutralizing amines, deionized water, and polyamine chain extenders;

[0015] The raw materials are macromolecular polyols, diisocyanates, polyethylene glycol, hydroxyl-containing hydrophilic monomers, small-molecule hydroxyl-terminated chain extenders, organic solvents, neutralizing amines, deionized water, and polyamine chain extenders;

[0016] After vacuum dehydration of macromolecular polyol at 80-100°C, react with diisocyanate at 50-95°C for 3-4 hours under the condition of nitrogen flow, then add polyethylene glycol, hydroxyl-containing hydrophilic monomer, small Molecular-terminal hydroxyl chain extender and ...

Embodiment 1

[0030] Present embodiment provides a kind of waterborne polyurethane preparation method for elastic coating, and this method comprises:

[0031] Take each raw material according to the table

[0032] Raw material type

[0033] The preparation method is as follows: vacuum dehydrate PTMG2000 at 100°C for 1.5 hours, cool down to room temperature, add DMPA, NPG and a small amount of solvent, add IPDI to heat up to 50-95°C after complete dissolution, keep the temperature for 3 hours, cool down to 50-90°C, Introduce TMP, PEG400 and DBTDL, heat preservation reaction for 2.5 hours, the prepared polyurethane prepolymer is lowered to 40-55°C, slowly add TEA dropwise to neutralize and form salt for 2-10 minutes, quickly shear and stir in deionized water and dropwise add hydration Hydrazine and DETA aqueous solution, the product after reaction is high elasticity water-based polyurethane emulsion.

Embodiment 2

[0035] Present embodiment provides a kind of waterborne polyurethane preparation method for elastic coating, and this method comprises:

[0036] Take each raw material according to the table:

[0037] Raw material type

[0038] Triethylamine (TEA) (neutralizing amine)

[0039] The specific preparation process is the same as in Example 1, see Example 1.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention discloses a preparation method for waterborne polyurethane applied to an elastic coating, which belongs to the field of chemical raw materials for building materials. The waterborne polyurethane is prepared by the following steps of: under the stirring and heating conditions, undergoing an addition polymerization reaction on macromolecular polyatomic alcohol, polyethylene glycol, diisocyanate, a hydrophilic hydroxyl-containing monomer, a micromolecular terminal hydroxyl chain extender and the like to generate a polyurethane prepolymer; neutralizing into a salt; dispersing and emulsifying; and performing polyamine chain extension. A waterborne polyurethane emulsion synthesized by using the method has coating elongation percentage of more than 650 percent, and can form a film at the temperature of 5 DEG C. After the waterborne polyurethane emulsion is prepared into a coating, the stain resistance is improved greatly, and the mechanical strength is much higher than that of the conventional acrylate coating film.

Description

technical field [0001] The invention relates to the field of chemical raw materials for building materials, in particular to a method for preparing water-based polyurethane used for elastic coatings. Background technique [0002] Factors such as thermal expansion and contraction, changes in dryness and humidity, and subsidence of the base will cause cracks in the building. Rainwater will penetrate into the wall through the cracks, which will accelerate the corrosion of steel bars and endanger the life of the building. In addition, due to the continuous improvement of the requirements for energy saving and emission reduction in recent years, insulation systems such as polystyrene boards, polyurethane foam boards, and rock wool boards have gradually become popular. These insulation systems will absorb a large amount of heat while maintaining a suitable indoor temperature. Expansion, so the surface coating is required to have a certain toughness and elasticity. [0003] Elasti...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
IPC IPC(8): C08G18/66C08G18/48C08G18/12C09D175/08
Inventor 郭祥恩刘东华周静静
Owner FIRST NEW MATERIAL TECH DEV