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Flame-retardant polyurethane sealant and preparation method thereof

A polyurethane sealant, polyurethane prepolymer technology, applied in the direction of polyurea/polyurethane adhesives, adhesives, adhesive types, etc., can solve the problems of fast burning speed, dripping, large flame, etc., and achieve flame retardant efficiency High, reduce the impact, improve the effect of flame retardant efficiency

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 flame-retardant polyurethane sealant, which can effectively reduce the damage to its physical and mechanical properties caused by the use of powder flame retardants in the polyurethane sealant , and it also solves the problems of large flame, fast burning speed and serious dripping when polyurethane sealant burns

Method used

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  • Flame-retardant polyurethane sealant and preparation method thereof
  • Flame-retardant polyurethane sealant and preparation method thereof
  • Flame-retardant polyurethane sealant and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0058] A preparation method of flame-retardant polyurethane sealant, comprising the following steps:

[0059] Step 1, the preparation of polyurethane prepolymer: 300g of flame-retardant polyether containing phosphorus element as the initiator, 400g of difunctional polyoxypropylene glycol with molecular weight of 5000 and polyoxypropylene diol with molecular weight of 5000 and trifunctionality Add 300g of propylene trihydric alcohol into the reaction kettle, stir and adjust the temperature of the reaction kettle to 100°C. After mixing evenly, remove water for 3.5h under the condition of vacuum degree of 0.096Mpa, cool down to 80°C, and wait for the temperature to be constant , and then added 123.2g of diphenylmethane-4,4'-diisocyanate and dibutyltin dilaurate accounting for 0.003% of the total mass of the above mixture to the reaction kettle, and reacted for 2.5h to obtain a polyurethane prepolymer.

[0060] Step 2: Preparation of flame retardant polyurethane sealant: combine 4...

Embodiment 2

[0062] A preparation method of flame-retardant polyurethane sealant, comprising the following steps:

[0063] Step 1, the preparation of polyurethane prepolymer: 700g of polyoxypropylene diols with a molecular weight of 5000 and 300g of polyoxypropylene triols with a trifunctionality of 5000 are added to the reactor, stirred and adjusted The temperature of the reaction kettle is 95°C. After mixing evenly, remove water for 2.5 hours under the condition of vacuum degree of 0.095Mpa, and lower the temperature to 75°C. After the temperature is constant, add 117.3g of diphenylmethane to the reaction kettle- 4,4'-diisocyanate and dibutyltin dilaurate accounting for 0.002% of the total mass of the above mixture were reacted for 2.5 hours to obtain a polyurethane prepolymer.

[0064] Step 2: Preparation of flame retardant polyurethane sealant: combine 400g of polyurethane prepolymer prepared in step 1 with 270.5g of heavy calcium with a particle size of 2000 mesh after vacuum dehydrat...

Embodiment 3

[0066] A preparation method of flame-retardant polyurethane sealant, comprising the following steps:

[0067] Step 1, preparation of polyurethane prepolymer: 600 g of polyoxypropylene diol with a molecular weight of 3000 difunctionality and 400 g of polyoxypropylene triol with a molecular weight of 5000 trifunctional are added to the reactor, stirred and adjusted for reaction The temperature of the kettle is 92°C. After mixing evenly, remove water for 2.5 hours under the condition of a vacuum of 0.096Mpa, and cool down to 70°C. After the temperature stabilizes, add 168g of diphenylmethane-4 to the reaction kettle. 4'-diisocyanate and dibutyltin dilaurate accounting for 0.001% of the total mass of the above mixture were reacted for 2.5 hours to obtain a polyurethane prepolymer.

[0068] Step 2: Preparation of flame retardant polyurethane sealant: combine 250 g of polyurethane prepolymer prepared in step 1 with 278.4 g of 5000 mesh heavy calcium after vacuum dehydration and dryi...

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Abstract

The invention relates to flame-retardant polyurethane sealant and a preparation method thereof. The polyurethane sealant comprises the components as follows: polyurethane prepolymer 10 to 45 percent, phosphonate flame-retardant plasticizing agent 0 to 25cent, flame-retardant synergist 0 to 10 percent, plasticizing agent 0 to 25 percent, thixotropic agent 1 to 10 percent, filling material 5 to 30 percent, photo-stabilizer 0.1 to 0.5 percent, antioxygen 0.1 to 0.5 percent, catalyst A 0.001 to 0.05 percent, silane adhesive attraction accelerant 0.5 to 3 percent, and dehumidizer 0.1 to 1.5 percent. Compared with the prior art, the invention has the advantages that the polyurethane prepolymer can play a flame-retardant effect, the phosphonate flame-retardant plasticizing agent with flame-retardant and plasticization effects can be adopted for flame retardancy for the polyurethane sealant, and the flame-retardant synergist can also be adopted for matching for synergy, so that the flame-retardant polyurethane sealant is endowed with a favorable flame retardant property while the physical and mechanical properties and the adhesive property of the polyurethane sealant are guaranteed.

Description

technical field [0001] The invention relates to the technical field of polyurethane sealants, in particular to a flame-retardant polyurethane sealant and a preparation method thereof. Background technique [0002] Polyurethane sealants have excellent elasticity, low temperature resistance, wear resistance and good adhesion to substrates. Therefore, it is widely used in fields such as construction, automobile, home improvement, waterproofing and shipbuilding. [0003] However, polyurethane sealant is flammable, and when it is burned by an external heat source, there are problems such as large flame, fast burning speed, serious dripping, thick smoke and toxic gas, which seriously threaten people's life and property safety. With the improvement of people's safety awareness in the fields of home decoration and construction, more and more attention has been paid to the flame retardancy of polyurethane sealants. [0004] In the prior art, in order to make polyurethane sealants h...

Claims

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Application Information

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IPC IPC(8): C09J175/08C09J11/06C08G18/50
Inventor 靳晓雨韦思其
Owner GUANGDONG PUSTAR SEALED RAYON CO LTD
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