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Low VOC polyurethane resin

A polyurethane resin and polyester technology, applied in the field of isocyanate-containing compositions, can solve problems such as increased VOC, corrosion, poor adhesion and aging resistance, and poor environmental protection

Active Publication Date: 2018-02-23
西安天元化工有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the VOC (volatile organic compound) content of the coating is relatively high, generally 70% to 20%, so its environmental protection is poor
The usual way to solve this problem is to prepare water-based polyurethane coatings, but water-based polyurethane resins have fatal shortcomings such as anti-corrosion, poor adhesion and aging resistance, and it is difficult to achieve the performance indicators of traditional solvent-based polyurethanes, thus limiting its application
[0003] Polyurethane is a high-molecular-weight polymer, and its 80-90% mass fraction of polyurethane products is extremely viscous and cannot be applied; it can only be mixed with organic solvents to 40%-70% to perform operations such as mixing pigments, but VOC also increases significantly

Method used

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  • Low VOC polyurethane resin
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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] In this embodiment, a raw material of polyhydroxyacrylate resin with a mass fraction of 85% (commercially available, with a viscosity of 6,000-10,000 centipoise, at 23° C.) was used.

[0036] Component A: 70 parts of polyhydroxyacrylate resin (hydroxyl value 70), 2 parts of hydroxypropyl acrylate, 15 parts of octyl acrylate, and 13 parts of butyl acrylate.

[0037] After the ingredients of component A are mixed, the viscosity is 35 seconds for 4 cups (23°C).

[0038] Component B: HDI trimer N3390 20 parts, methyl ethyl ketone peroxide 1.4 parts.

[0039] Component C cobalt isooctanoate (4% solution) 0.3 parts.

[0040] The preparation method of polyurethane in this example: mix polyhydroxyacrylate resin, hydroxypropyl acrylate, octyl acrylate and butyl acrylate evenly to form component A; mix N3390 and methyl ethyl ketone peroxide to form component B. Component C is the accelerator cobalt isooctanoate. The three are packaged separately.

[0041] The polyurethane pre...

Embodiment 2

[0046] Component A: 70 parts of polyester resin (hydroxyl value 175), 2 parts of hydroxypropyl acrylate, 13 parts of isodecyl acrylate (IDA), 15 parts of butyl acrylate.

[0047] Component B: 55 parts of HDI trimer N3390, 1.4 parts of cyclohexanone peroxide.

[0048] Component C: 0.15 parts of cobalt isooctanoate (4% solution).

[0049] The preparation method of the polymer coating in this example: mix polyester resin, hydroxypropyl acrylate, isodecyl acrylate and butyl acrylate evenly to form component A; mix N3390 and methyl ethyl ketone peroxide to form component B. Component C is the accelerator cobalt isooctanoate.

[0050] The VOC value of the polyurethane prepared in this embodiment is 4%, and has the characteristics of VOC less than 10%. hours (UVA-340). Viscosity is Tu 4 cup 60. The adhesion test was carried out in accordance with ASTM D 4541-2009 "Test Method for Determining Coating Pull-off Strength Using Portable Adhesion Tester", and the measured adhesion was ...

Embodiment 3

[0052] Component A: 20 parts of polyester resin (hydroxyl value 175), 50 parts of polyhydroxyacrylate resin (hydroxyl value 70), 2 parts of hydroxypropyl acrylate, 13 parts of isodecyl acrylate (IDA), 15 parts of butyl acrylate .

[0053] B component: HDI trimer N3390 30 parts. 1.4 parts of cyclohexanone peroxide.

[0054] Component C: 0.15 parts of cobalt isooctanoate (4% solution).

[0055] The VOC value of the polyurethane prepared in this embodiment is 6.2%. Anti-aging According to "GB / T14522-2008 Test Method for Artificial Weathering of Coatings Used in Machinery Industry Products by Fluorescent Ultraviolet Lamp", the QUV test reaches 1500 hours (UVA-340). Viscosity is Tu 4 cups 40s. The adhesion test was carried out in accordance with ASTM D 4541-2009 "Test Method for Determining Coating Pull-Off Strength Using Portable Adhesion Tester", and the measured adhesion was 9Mpa.

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Abstract

The invention discloses a low VOC polyurethane resin. The low VOC polyurethane resin comprises an A component and a B component. The A component contains, by mass, 5 to 90 parts of a polyester and / ora polyhydroxy acrylate, 2 to 80 parts of a reactive monomer, and 0 to 0.2 part of a polymerization inhibitor; the B component comprises, by weight, 5 to 60 parts of an isocyanate, and 0 to 2.0 parts of an organic peroxide. The polyurethane composition system is composed of the reactive monomer low in viscosity and the polyhydroxy acrylate or the polyester and the diisocyanate, on one hand, the reactive monomer is capable of reducing the viscosity of the polyurethane system, and on the other hand, a crosslinked polymer is formed via reaction of the reactive monomer with polyurethane molecular chains under the action of an initiator and a promoter; and the polyurethane resin is formed via crosslinking of the polyhydroxy acrylate resin or the polyester with the diisocyanate. The above large molecular polymer obtained via two times of reaction is a solidified polymer resin.

Description

technical field [0001] The invention belongs to the field of organic polymer materials, in particular to a composition containing isocyanate. Background technique [0002] Polyurethane is a commonly used industrial protective and decorative coating, which has good anti-aging performance and corrosion resistance. However, the VOC (volatile organic compound) content of the coating is relatively high, generally 70% to 20%, so its environmental protection is relatively poor. The usual way to solve this problem is to prepare water-based polyurethane coatings, but water-based polyurethane resins have fatal shortcomings such as anti-corrosion, poor adhesion and aging resistance, and it is difficult to achieve the performance indicators of traditional solvent-based polyurethanes, thus limiting its application. [0003] Polyurethane is a high-molecular-weight polymer, and its 80-90% mass fraction of polyurethane products is extremely viscous and cannot be applied; it can only be mix...

Claims

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Application Information

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IPC IPC(8): C08G18/79C08G18/67C08G18/62C08G18/42C09D175/04C09D175/06C09D175/14C09D7/63
CPCC08G18/42C08G18/622C08G18/672C08G18/792C08K5/098C09D175/04C09D175/06C09D175/14C08G18/62
Inventor 张建红
Owner 西安天元化工有限责任公司
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