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Rapidly bonded single-component polyurethane sealant and preparation method thereof

A polyurethane sealant, one-component technology, applied in polyurea/polyurethane adhesives, adhesives, adhesive types, etc., can solve the problems of low strength, low tensile shear strength, etc., and achieve high crosslinking density , dense cross-linked network structure, and the effect of increasing tensile shear strength

Inactive Publication Date: 2019-02-15
SHANDONG NORTH MODERN CHEM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In summary, the current one-component polyurethane adhesive sealant has the following deficiencies: first, the single-component polyurethane sealant relies on moisture in the air to cure, and the strength in the early stage of curing is low; The tensile shear strength is low in a short time, such as the tensile shear strength of 3 hours generally does not exceed 0.5MPa

Method used

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  • Rapidly bonded single-component polyurethane sealant and preparation method thereof
  • Rapidly bonded single-component polyurethane sealant and preparation method thereof
  • Rapidly bonded single-component polyurethane sealant and preparation method thereof

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preparation example Construction

[0061] The present invention also includes a kind of preparation method of the one-component polyurethane sealant of fast bonding, comprising

[0062] The following steps:

[0063] ① In parts by weight, add 15 to 36 parts of polyether polyol and 6 to 18 parts of polyester polyol into the reaction kettle, heat up to 110 to 130°C, and vacuum dehydrate at a vacuum degree of not less than 0.095MPa for 0.5 ~1 hour, cool down to 55~65℃, add 5~15 parts of isocyanate, heat up to 75~85℃, keep the reaction temperature between 80~90℃, react under nitrogen protection for 3~5 hours, cool down to 20~ Discharging at 30°C to obtain a prepolymer;

[0064] The polyether polyol is a trifunctional polyoxypropylene ether with a molecular weight of 3000-6000;

[0065] The polyester polyol is a difunctional polycaprolactone polyol or polycarbonate polyol with a molecular weight of 1000-3000;

[0066] The isocyanate is one or both of diphenylmethane diisocyanate, toluene diisocyanate, isophorone d...

Embodiment 1

[0081] A quick bonding one-component polyurethane sealant, composed of the following raw materials: 15kg polyether polyol, 6kg polyester polyol, 5kg isocyanate, 15kg plasticizer, 0.2kg water remover, 20kg filler, 2kg resin filler , UV light stabilizer 0.05kg, curing accelerator 1kg, hydrolysis accelerator 0.01kg and catalyst 0.01kg;

[0082] The polyether polyol is a trifunctional polyoxypropylene ether with a molecular weight of 3000-6000;

[0083] The polyester polyol is a difunctional polycaprolactone polyol with a molecular weight of 1000-3000;

[0084] Described isocyanate is diphenylmethane diisocyanate;

[0085] Described plasticizer is epoxidized soybean oil;

[0086] The water removal agent is p-toluenesulfonyl isocyanate;

[0087] Described filler is acetylene carbon black;

[0088] The resin filler is polyamide resin;

[0089] The ultraviolet light stabilizer is 2-(2'-hydroxyl-3',5'-dipentylphenyl)benzotriazole;

[0090] The hydrolysis accelerator is benzoic a...

Embodiment 2

[0094] A fast bonding one-component polyurethane sealant, composed of the following raw materials: polyether polyol 36kg, polyester polyol 18kg, isocyanate 15kg, plasticizer 28kg, water remover 1kg, filler 25kg, resin filler 10kg, UV light stabilizer 0.7kg, curing accelerator 5kg, hydrolysis accelerator 0.15kg and catalyst 0.4kg;

[0095] The polyether polyol is a trifunctional polyoxypropylene ether with a molecular weight of 3000-6000;

[0096] The polyester polyol is a difunctional polycarbonate polyol with a molecular weight of 1000-3000;

[0097] Described isocyanate is toluene diisocyanate;

[0098] Described plasticizer is dipropylene glycol dibenzoate;

[0099] The water removal agent is p-toluenesulfonyl isocyanate;

[0100] The filler is fumed white carbon black;

[0101] The resin filler is PVC paste resin;

[0102] The ultraviolet light stabilizer is 2-hydroxyl-4-n-octyloxybenzophenone;

[0103] The hydrolysis accelerator is salicylic acid;

[0104] The cataly...

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Abstract

The invention discloses a rapidly bonded single-component polyurethane sealant and a preparation method thereof. The polyurethane sealant consists of the following raw materials: 15-36 parts of polyether polyol, 6-18 parts of polyester polyol, 5-15 parts of isocyanate, 1-5-28 parts of a plasticizer, 0.2-1 part of a dewatering agent, 20-25 parts of a filler, 2-10 parts of a resin filler, 0.05-0.7 part of an ultraviolet stabilizer, 1-5 parts of a curing promoter, 0.01-0.15 part of a hydrolysis promoter and 0.01-0.4 part of a catalyst. According to the polyurethane sealant disclosed by the invention, a self-made oxazolidine type curing promoter is used, so that the difficulties that a conventional single-component wet curing system is slow in curing speed, bubbles can be easily generated in the cross-linking process and a double-component alcamine curing system is complex to operate and short in application period can be solved; in addition, the viscosity of the polyurethane sealant can be effectively reduced, the amount of a volatile organic solvent can be reduced, and requirements of green and environment protection can be met.

Description

technical field [0001] The invention relates to the technical field of adhesives, in particular to a fast bonding one-component polyurethane sealant and a preparation method thereof. Background technique [0002] Assembly line production is widely used in the production of modern automobile industry. With the acceleration of production rhythm, it is required that the vehicle can quickly enter the next process after the glass is installed. Due to the low initial strength of polyurethane used for glass bonding, especially in the The curing speed of the sealant is very slow under low temperature and low humidity conditions, so the glass is prone to shake and produce abnormal noise when the vehicle moves in a short period of time. Therefore, it is necessary to give the polyurethane sealant sufficient curing time to improve the bonding strength, but this operation will affect The efficiency of the entire production line. [0003] According to my country's "Automobile Safety Glas...

Claims

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Application Information

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IPC IPC(8): C09J175/08C09J175/06C09J11/04C09J11/06C09J11/08C08G18/40C08G18/48C08G18/42C08G18/44
CPCC08G18/4018C08G18/4277C08G18/44C08G18/4829C08K2201/014C08L2205/03C08L2312/00C09J11/04C09J11/06C09J11/08C09J175/06C09J175/08C08L91/00C08L77/00C08K13/02C08K3/04C08K5/3475C08K5/09C08L27/06C08K3/36C08K5/42C08K5/13
Inventor 张健伟杜厚俊王力于伟强王玉东董斌
Owner SHANDONG NORTH MODERN CHEM IND
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