Polyurethane sealant with good initial adhesion

A technology of polyurethane sealant and initial tack, applied in the field of materials, can solve problems such as poor bonding strength, slow bonding speed on the surface of non-porous substrates, etc., and achieve excellent bonding performance

Active Publication Date: 2012-06-20
GUANGDONG PUSTAR SEALED RAYON CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to avoid the deficiencies in the prior art and provide a polyurethane sealant with good initial tack. The polyurethane sealant...

Method used

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  • Polyurethane sealant with good initial adhesion

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0056] A polyurethane sealant with good initial tack, comprising raw materials composed of the following mass percentages:

[0057] Polyurethane prepolymer: 45%; dioctyl phthalate: 25%; molecular weight 2000 end mercapto polysulfide rubber: 1.5%; nano fumed silica: 5%; 2000 mesh heavy calcium: 22.15%; UV- 213: 0.02%; Irgastab PUR68: 0.03%; γ-mercaptopropyltrimethoxysilane: 1%; Trimethyl triformate: 0.3%.

[0058] (1) The above-mentioned polyurethane prepolymer is prepared by adding 800 g of polyether polyol with a molecular weight of 2000 bifunctionality and 200 g of polyether polyol with a molecular weight of 5000 trifunctionality in the reaction kettle , Stir and adjust the temperature of the reactor to 100°C. After mixing evenly, remove water for 3.0h under the condition of vacuum degree of 0.096Mpa, and cool down to 65°C. After the temperature is constant, add 232.5g of diphenylmethane-4 , 4'-diisocyanate, and adding 0.001% dibutyltin dilaurate to the total mass of the ab...

Embodiment 2

[0061] A polyurethane sealant with good initial tack, comprising raw materials composed of the following mass percentages:

[0062] Polyurethane prepolymer: 30%; Dioctyl adipate: 30%; Terpene resin: 1.5%; Polyamide thixotropic agent: 1%; 1200 mesh kaolin: 35.45%; UV-213: 0.03%; Irgastab PUR68: 0.02%; γ-glycidyloxypropyltrimethoxysilane: 1.5%; oxazolidine moisture scavengers: 0.5%.

[0063] (1) The above-mentioned polyurethane prepolymer is prepared by adding 500 g of polyether polyol with a molecular weight of 2000 bifunctionality and 500 g of polyether polyol with a molecular weight of 5000 trifunctionality in the reaction kettle , Stir and adjust the temperature of the reactor to 120°C. After mixing evenly, remove water for 2.0 hours under the condition of a vacuum of 0.096Mpa, and cool down to 60°C. After the temperature is constant, add 146.2g of toluene diisocyanate, and add 0.003% of the total mass of the above mixture of stannous octoate was reacted for 2.5 hours to ob...

Embodiment 3

[0066] A polyurethane sealant with good initial tack, comprising raw materials composed of the following mass percentages:

[0067] Polyurethane prepolymer: 35%; phenyl alkylsulfonate: 25%; hydroxyl-terminated nitrile rubber with a molecular weight of 2500: 2.5%; polyoxyalkylene branched silicone thixotropic agent: 1.5%; insulating glass Microbeads: 32.9%; (2,2,6,6-tetramethylpiperidine) sebacate: 0.05%; Irganox 5057: 0.05%; N-β-(aminoethyl)-γ-aminopropyl Trimethoxysilane: 2%; Vinyltrimethoxysilane: 1%.

[0068] (1) The above-mentioned polyurethane prepolymer is prepared by adding 400 g of polyether polyol with a molecular weight of 5000 difunctionality and 600 g of polyether polyol with a molecular weight of 5000 trifunctionality in the reaction kettle , Stir and adjust the temperature of the reactor to 90°C. After mixing evenly, remove water for 3.5 hours under the condition of a vacuum of 0.095Mpa, cool down to 75°C, and add 136.5g of diphenylmethane-4 after the temperatur...

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Abstract

The invention discloses a polyurethane sealant with good initial adhesion. The polyurethane sealant comprises the following ingredients in percentage by mass: 15 to 45 percent of polyurethane prepolymer, 10 to 40 percent of plasticizers, 0.5 to 15 percent of initial adhesion promoters, 1 to 10 percent of thixotropic agents, 5 to 30 percent of filling materials, 0.1 to 0.5 percent of light stabilizers, 0.1 to 0.5 percent of antioxidants, 0.5 to 3 percent of silane type bonding promoters and 0.1 to 1.5 percent of moisture removing agents, wherein the polyurethane prepolymer is obtained through preparation. Compared with the prior art, the polyurethane sealant has the following characteristics that: (1) the polyurethane sealant has good initial adhesion on the surfaces of imporous substrates such as glass, ceramics and the like, and the problems that the adhesion force in the initial curing period is poor and the adhesion damage is easy to occur when the polyurethane sealant receives external force effect are solved; and (2) no bubble exists in the sealant layer during the humid air curing, and the adhesion performance is good.

Description

Technical field [0001] The present invention belongs to the field of material technology, especially in a polyurethane sealant with good initial stickiness. Background technique [0002] Polyurethane sealing has solvents or low solvents, facade coating does not flow, oil -resistant, moldy, chemical resistance, excellent anti -noise, anti -vibration impact and other performances., Easy to repair and other advantages.Therefore, applications in industries such as automobile production, maintenance, container manufacturing, ships, buildings, and instruments are becoming increasingly widespread. [0003] The main material of polyurethane sealing is prefabricated with a sealing end of the isocyanate group. It can react with the water in the air under room temperature conditions to form a high -intensity elastic body.When the polyurethane sealant is used, there is a phenomenon such as easily discolored discoloration and easy to become sticky on the surface. In particular, the prefabrica...

Claims

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Application Information

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IPC IPC(8): C09J175/08C09J11/06C09K3/10C08G18/48C08G18/12
Inventor 靳晓雨韦思其
Owner GUANGDONG PUSTAR SEALED RAYON CO LTD
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