Internal plasticization type mono-component polyurethane seal gum

A polyurethane sealant, one-component technology, applied in polyurea/polyurethane adhesives, adhesives, adhesive types, etc., can solve insurmountable problems, achieve good elasticity, improve soap water extraction resistance, The effect of good environmental adaptability

Active Publication Date: 2010-12-08
GUANGDONG PUSTAR SEALED RAYON CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method cannot fundamentally overcome the problem of externally added plasticizers migrating to th...

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Embodiment 1: In this embodiment, the trifunctional isocyanate is HDI trimer, the curing agent is diphenylmethane diisocyanate, the reinforcing filler is fumed silica, and the filler is talcum powder.

[0027] Add the monohydroxyl polyether with a molecular weight of 1000 that has been dehydrated to the HDI trimer toluene solution, and react at 80°C until the NCO content is 2 / 3 of the initial content, and then the branched type with active NCO is obtained. Internal plasticizer. Add diphenylmethane diisocyanate to trihydroxy polyether polyol with a molecular weight of 8000, and react at 80° C. for 5 hours to prepare a polyurethane prepolymer. Then, mix at high speed according to the following formula to prepare internally plasticized one-component polyurethane sealant. The internally plasticized one-component polyurethane sealant can be used in the construction field.

[0028] In percent by weight:

[0029] Internal plasticizer 40%

[0030] Polyurethane prepolymer 20...

Embodiment 2

[0036] Embodiment 2: In this embodiment, the trifunctional isocyanate is HDI trimer, the curing agent is diphenylmethane diisocyanate, the reinforcing filler is fumed silica, and the filler is talcum powder. .

[0037] Add the monohydroxyl polyether with a molecular weight of 2000 that has been dehydrated to the HDI trimer toluene solution, and react at 80°C until the NCO content is 2 / 3 of the initial content, and then the branched chain type with active NCO is obtained. Internal plasticizer. Add diphenylmethane diisocyanate to trihydroxy polyether polyol with a molecular weight of 5000, and react at 80° C. for 5 hours to prepare a polyurethane prepolymer. Then, mix at high speed according to the following formula to prepare internally plasticized one-component polyurethane sealant. The internally plasticized one-component polyurethane sealant can be used in the construction field.

[0038] In percent by weight:

[0039] Internal plasticizer 40%

[0040] Polyurethane prep...

Embodiment 3

[0046] Embodiment 3: In this embodiment, the trifunctional isocyanate is HDI biuret, the curing agent is toluene diisocyanate, the reinforcing filler is carbon black, the filler is talcum powder, and the silane coupling agent is KH-550.

[0047] Add the monohydroxy polyether with dehydration molecular weight of 5000 to the HDI biuret toluene solution, and react at 85°C until the NCO content is 2 / 3 of the initial one, to obtain a branched internal additive with active NCO. plasticizer. Add toluene diisocyanate to trihydroxy polyether polyol with a molecular weight of 1500, and react at 80°C for 5 hours to prepare a polyurethane prepolymer. Then, mix at high speed according to the following formula to prepare internally plasticized one-component polyurethane sealant. The internally plasticized one-component polyurethane sealant can be used in the automotive field.

[0048] In percent by weight:

[0049] Internal plasticizer 10%

[0050] Polyurethane prepolymer 40%

[0051] ...

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Abstract

The invention relates to a polyurethane seal gum for building sealing or automobile sealing, in particular to an internal plasticization type mono-component polyurethane seal gum. The internal plasticization type mono-component polyurethane seal gum consists of the following raw materials in percentage by weight: 10 to 40 percent of internal plasticizer, 20 to 40 percent of polyurethane prepolymer, 0 to 25 percent of reinforcing filler, 10 to 35 percent of filler, 0 to 8 percent of titanium pigment, 0 to 1 percent of silane coupling agent, and 0.1 to 0.3 percent of dibutyltin dilaurate, wherein the internal plasticizer is a branched internal plasticizer with active NCO and is prepared from dewatered monohydroxy polyether or monoamino polyether and tri-functional group isocyanate according to a volume ratio of 1:3-4 of active H/NCO substances through reaction under the condition that the temperature is between 50 and 90 DEG C; and the polyurethane prepolymer is prepared by synthesizing polyether polyol and a curing agent. The internal plasticization type mono-component polyurethane seal gum has high soap water extraction resistance, and simultaneously can keep high elasticity for a long time.

Description

technical field [0001] The invention relates to a polyurethane sealant for building sealing or automobile sealing, in particular to an internally plasticized single-component polyurethane sealant. Background technique [0002] In the prior art, raw materials for preparing polyurethane sealants usually contain externally added plasticizers. However, due to the migration of externally added plasticizers, polyurethane sealants have poor resistance to soapy water extraction. During use, due to the poor soap water extraction performance of the polyurethane sealant, the polyurethane sealant has black water or oil flow, which affects the appearance of the product; at the same time, due to the migration and loss of the externally added plasticizer , causing the hardness of the sealant to increase and the elongation to decrease, which affects the elastic recovery rate and sealing effect of the product. [0003] At present, products on the market generally achieve the purpose of slo...

Claims

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Application Information

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IPC IPC(8): C09J175/08C09K3/10
Inventor 李桂妃
Owner GUANGDONG PUSTAR SEALED RAYON CO LTD
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