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Sealant composition, polyurethane sealant and preparation method of polyurethane sealant

A technology of polyurethane sealant and composition, applied in the field of sealant, can solve the problems of increased cost and energy consumption, inconvenient storage, transportation and processing, poor compatibility of glass microbeads, etc., so as to reduce labor costs and construction strength, and reduce production. and transportation costs, the effect of reducing density

Inactive Publication Date: 2021-08-06
CRERAX SCI & TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The current sealants on the market are dense and heavy, which is very inconvenient for storage, transportation, and processing, which greatly increases the cost and energy consumption. Lightweight is an important development direction of sealants
Although inorganic hollow glass microspheres can be used as lightweight fillers to reduce the weight of the sealant, the glass microspheres have poor compatibility with the sealant system and poor elasticity, and are easily damaged during use

Method used

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  • Sealant composition, polyurethane sealant and preparation method of polyurethane sealant

Examples

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Effect test

preparation example Construction

[0022] The embodiment of the present application provides a preparation method of polyurethane sealant, comprising the following steps:

[0023] Step 1, put 80-100 parts of polyether polyol at 100-110 ° C, dehydrate under reduced pressure for 2 hours in a vacuum of 0.1 MPa, cool to 60 ° C, then add 10-20 parts of isocyanate and 0.01-0.1 parts of prepolymerization The temperature of the bulk catalyst is raised to 80-90° C., and the reaction is carried out for 5-8 hours to obtain a prepolymer. The polyether polyol is a polyether polyol or a mixture of polyether polyols with a weight average molecular weight (Mw) of 2000-7000. The function of the prepolymer catalyst is to catalyze the addition polymerization reaction when synthesizing the polyurethane prepolymer. The prepolymer catalyst is stannous octoate, stannous octoate dibutyltin laurate, triethylenediamine, bismorpholine diethyl, triethylamine, dibutyltin dichloride, butyl stannous octoate, tetramethylbutyl any of the diam...

Embodiment 1

[0038] Step 1, dehydrate 89.7 parts of polyoxypropylene-oxyethylene triol (Mw=7000) at 110°C for 2 hours under vacuum at 0.1 MPa, cool to 60°C, add 10.3 parts of diphenylmethane diisocyanate and 0.01 part of octanoic acid The stannous temperature was raised to 90°C, and the reaction was carried out for 5 hours to obtain a prepolymer.

[0039] Step 2: Stir 100 parts of calcium carbonate at 90°C for 15 minutes at high speed, add 0.1 part of oleic acid, and continue stirring for 30 minutes to obtain modified calcium carbonate.

[0040] Step 3, 35 parts of the above-mentioned prepolymer, 35 parts of modified calcium carbonate, 0.1 part of expanded microspheres, 5 parts of diisononyl phthalate and 0.1 part of fumed silica are added to the planetary dynamic mixer, and the vacuum Stir at 0.1MPa for 0.5h, then add 0.01 part of alkylsulfonic acid isocyanate and 0.2 part of dioctyltin dilaurate, and stir for 30min at a vacuum of 0.1MPa to obtain a low-density one-component polyurethane ...

Embodiment 2

[0046] Step 1, 45.7 parts of polyoxypropylene diol (Mw=2000) and 34.5 parts of polyoxypropylene triol (Mw=3000) were dehydrated under reduced pressure at 110 ° C for 2 hours at a vacuum degree of 0.1 MPa, cooled to 60 ° C, and 14.8 parts of toluene were added Diisocyanate and 0.05 parts of stannous octoate are heated to 80°C and reacted for 8 hours to obtain a prepolymer.

[0047] Step 2: Stir 100 parts of calcium carbonate / kaolin at 70°C for 10 minutes at high speed, add 1 part of stearic acid, and continue stirring for 30 minutes to obtain modified calcium carbonate / kaolin.

[0048] Step 3, 65 parts of above-mentioned prepolymers, 20 parts of modified calcium carbonate, 10 parts of modified kaolin, 2 parts of expanded microspheres, 25 parts of epoxy soybean oil and 5 parts of fumed silica are added in the planetary dynamic mixer, Stir at a vacuum of 0.1 MPa for 1.5 hours, then add 0.5 parts of alkylsulfonic acid isocyanate and 0.5 parts of dibutyltin dilaurate, and stir for ...

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Abstract

The invention provides a sealant composition, a polyurethane sealant and a preparation method of the polyurethane sealant, and belongs to the field of sealers. The sealant composition is specifically prepared from, by mass, 35-65 parts of prepolymer, 20-40 parts of modified filler, 0.1-2 parts of expanded microspheres, 5-25 parts of plasticizer, 0.1-5 parts of thixotropic agent, 0.01-0.5 part of water removal agent and 0.01-0.5 part of catalyst. The prepolymer is obtained by reacting 80-100 parts by mass of polyether polyol and 10-20 parts by mass of isocyanate for 5-8 hours; the modified filler is obtained by stirring 100 parts of filler and 0.1 to 3 parts of modifier for 30 to 40 minutes; the expanded microspheres are formed by wrapping a volatile expanding agent serving as a core agent in a shell formed by a polymer, the shell is formed by polymerizing a monomer mixture of polymerizable monomers, and the polymerizable monomers are at least one of acrylonitrile, acrylate monomers, acrylamide monomers and acrylic acid monomers. Through the treatment scheme, the density of the sealant is remarkably reduced, the sealant is convenient to store and transport, the production and transportation cost is reduced, and the sealant has good heat insulation and sound insulation effects.

Description

technical field [0001] The invention relates to the field of sealants, in particular to a sealant composition, a polyurethane sealant and a preparation method for the polyurethane sealant. Background technique [0002] Sealant is a sealing material that bonds the surfaces of the same or different solid materials together, or is used to fill the gaps in the material, and acts as a sealant. It is a kind of adhesive that is leak-proof, waterproof, Anti-vibration and heat insulation, sound insulation and other functions. Sealants are widely used in aerospace, automobile transportation, machinery manufacturing, material processing, electronic appliances, national defense and military industry, building materials, petrochemical industry, printing and binding, light industry and textile, medical and health care, and daily life. Sealant and bonding technology has been developed to the extent that almost everything is not sticky, and the development potential is huge. [0003] Howe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J175/08C09J11/04C09J11/08
CPCC09J175/08C09J11/04C09J11/08C08K2003/265C08K2003/2227C08L33/00C08K9/04C08K3/26C08K3/346C08K3/22
Inventor 汪丹越张恒頔刘雪云
Owner CRERAX SCI & TECH CO LTD
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