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Bi-component polyurethane coating and preparation method thereof

A two-component polyurethane and coating technology, applied in the field of coatings, can solve the problems of not seeing high thixotropic products, shorten the pot life of coatings, increase the difficulty of construction, etc., and achieve improved sag resistance, excellent construction performance, and excellent mechanics. performance effect

Active Publication Date: 2012-10-31
JIANGSU SOBUTE NEW MATERIALS +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Patent CN 101818022A discloses a vertical one-component polyurethane waterproof coating and its preparation method, which utilizes the rapid reaction of amine-based additives and isocyanate to achieve the purpose of thickening, however, due to the fast reaction of amine-based compounds and isocyanate , the viscosity rises quickly, which increases the difficulty of construction and shortens the pot life of the coating
[0004] In China, there is no polyurethane waterproof coating specially used for facades and slopes, and high thixotropic products that greatly improve the sag resistance of the product while ensuring the construction and physical and chemical properties have not been seen.

Method used

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  • Bi-component polyurethane coating and preparation method thereof
  • Bi-component polyurethane coating and preparation method thereof
  • Bi-component polyurethane coating and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0077] A component preparation 1

[0078] Add 400g polyethylene adipate diethylene glycol ester diol, 8g plasticizer dioctyl phthalate and storage stabilizer tetraethyl orthosilicate 1g into the reaction vessel with stirring device, start Stir and heat up to 110°C, vacuum degree -0.09MPa, vacuum dehydration for 1.5h, cool down to 50°C, release the vacuum with dry air, add 180g of diphenylmethane diisocyanate, continue stirring at constant temperature for 25min, heat up to 85°C and stir for 2h , the temperature was lowered to below 65°C, the material was discharged, sealed and packaged with nitrogen gas, and a prepolymer with an isocyanate content of 7.4% (w / w) was obtained.

Embodiment 2

[0080] A component preparation 2

[0081] 300g polytetramethylene ether glycol, 20g polyether trihydric alcohol N330, 30g dibutyl phthalate, 30g dibutyl sebacate, 20g dioctyl sebacate and storage stabilizer triphenyl phosphate Add 20g of ester and 20g of tartaric acid into the reaction vessel with a stirring device, start stirring and heat up to 110°C, vacuum degree -0.09MPa, vacuum dehydration for 1.5h, cool down to 50°C, pass dry air to release the vacuum, add 160g of toluene diisocyanate , continue stirring at constant temperature for 25 minutes, raise the temperature to 85°C and stir for 2 hours at constant temperature, cool down to below 65°C, discharge, and seal the package with nitrogen gas to obtain a prepolymer with an isocyanate content of 10.6% (w / w).

Embodiment 3

[0083] A component preparation 3

[0084] Add 220g polycaprolactone diol, 350g polyether diol N220, 70g polycarbonate-1,6 ethylene glycol ester diol, 10g C9 petroleum resin, 5g storage stabilizer tetraethyl carbonate, and 5g phosphoric acid In a reaction vessel with a stirring device, start stirring and heat up to 110°C, vacuum degree -0.09MPa, vacuum dehydration for 1.5h, cool down to 50°C, release the vacuum with dry air, add 180g of hydrogenated phenylmethane diisocyanate and 220g of p- For phenylene diisocyanate, continue to stir at constant temperature for 25 minutes, raise the temperature to 85°C and stir for 2 hours at constant temperature, cool down to below 65°C, discharge, and seal the package with nitrogen gas to obtain a prepolymer with an isocyanate content of 4.6% (w / w).

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Abstract

The invention relates to a bi-component polyurethane coating which is prepared from a component A and a component B in a weight ratio of 1:(1-3), wherein the component A comprises the following materials in parts by weight: 40-80 parts of polylol, 20-50 parts of polyisocyanates, 1-10 parts of plasticizer and 0-5 parts of storage stabilizing agent; and the component B comprises the following materials in parts by weight: 10-40 parts of polylol, 10-40 parts of liquid filler, 5-10 parts of crosslinking agent, 30-60 parts of solid filler, 3-15 parts of plasticizer, 0.1-8 parts of thixotropic agent, 0-5 parts of pigment and 0.2-5 parts of additive. The bi-component polyurethane coating is suitable for water prevention, permeability resistance, corrosion resistance and protection of a horizontal plane, can be thickly coated and constructed (>3mm / turn) on complex parts such as a vertical surface and an incline, does not generate sagging and bubble phenomena in a construction process, is full in color, and has the advantages of excellent mechanical property, shock resistance, water resistance and corrosion resistance.

Description

technical field [0001] The invention relates to a coating, in particular to a high thixotropic two-component polyurethane coating and a preparation method thereof. Background technique [0002] Polyurethane coating is a new type of material widely used at present, with various excellent properties such as oil resistance, wear resistance, corrosion resistance, waterproof and impermeability. It has played an important role in the waterproofing and anti-corrosion of buildings, and has made a significant contribution to improving the service life of buildings and achieving the goal of energy-saving and emission-reduction of modern concrete. Focus on the promotion of paint products. [0003] However, the currently used polyurethane coatings are prone to sagging when the slope is large or when the facade is constructed, and cannot be applied thickly (<0.2mm, multiple applications are required to meet the engineering requirements), or even cannot be applied, which limits the qu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D175/04C09D175/08C09D175/06C09D175/14C09D7/12
Inventor 冉千平孙德文刘加平杨冲杨勇周栋梁
Owner JIANGSU SOBUTE NEW MATERIALS
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