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Nano organic montmorillonite modified end-silicane-group organosilicon modified polyurethane type seal gum and preparation method thereof

A nano-organic, silyl-terminated technology, applied in the field of sealants, can solve the problems of elasticity-elongation at break, etc.

Inactive Publication Date: 2008-01-02
海南中科翔新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The sealants disclosed in the above-mentioned patent applications were not modified by silicone copolymerization and nano-intercalation technology at the same time during the preparation. length will decrease

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0076] After dehydrating 240g of N220 polyether, mix it with 27.2g of toluene diisocyanate (TDI), react at 90°C for 5 hours in a vacuum environment to prepare a polyurethane prepolymer, and then add the silane coupling agent N-phenyl- 18.5g of γ-aminopropyltrimethoxysilane was reacted at 80°C for 2 hours to prepare a silyl-terminated polyurethane; 14.3g of nano-organic montmorillonite was added to the above-mentioned silyl-terminated polyurethane, stirred evenly and then mechanically Grinding; then 343g 800 mesh silicon dioxide and 2.8g dibutyltin dilaurate are added to the silyl-terminated polyurethane modified by nano-organic montmorillonite, and stirred evenly to obtain a nano-organic montmorillonite-modified silyl-terminated polyurethane type seal glue. The hardness of the obtained sealant is 32, the tensile strength is 0.74 MPa, and the elongation at break is 241%.

Embodiment 2

[0078] After dehydration of 21.8g of α, ω-dihydroxy polydimethylsiloxane, 265g of 330N polyether and 102g of N220 polyether, with 49.5g of diphenylmethane-4,4'-diisocyanate (MDI ) mixed, and reacted at 95°C for 5 hours in a vacuum environment to prepare a polyurethane prepolymer, then added 33.7g of silane coupling agent N-phenyl-γ-aminopropyltrimethoxysilane, and reacted at 80°C for 2 hours, prepared into silyl-terminated polyurethane; 52.5g of nano-organic montmorillonite was added to the above-mentioned silyl-terminated polyurethane, stirred evenly, and then mechanically ground; then 26.3g of nano-silica, 5.3g of dibutyltin dilaurate Add it into the silyl-terminated polyurethane modified by nano-organic montmorillonite, and stir evenly to obtain the nano-organic montmorillonite-modified silyl-terminated polyurethane type sealant. The hardness of the obtained sealant is 34, the tensile strength is 1.19 MPa, and the elongation at break is 270%.

Embodiment 3

[0080] After dehydrating 16g of α, ω-dihydroxypolydimethylsiloxane and 200g of N210 polyether, mix it with 53.3g of isophorone diisocyanate (IPDI), and react at 90°C for 5 hours in a vacuum environment , to prepare a polyurethane prepolymer, then add 21.5 g of silane coupling agent anilinomethyltriethoxysilane, react at 80 ° C for 2 hours, and prepare a silyl-terminated polyurethane; add 101 g of nano-organic montmorillonite to In the above-mentioned silyl-terminated polyurethane, stir it evenly and grind it mechanically; then add 251g of 300-mesh calcium carbonate and 6.2g of stannous octoate into the silyl-terminated polyurethane modified by nano-organic montmorillonite, and stir evenly to obtain nano-organic montmorillonite Soil-modified silicone-based polyurethane sealant. The hardness of the obtained sealant was 42, the tensile strength was 1.65 MPa, and the elongation at break was 203%.

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Abstract

The invention discloses a modified polyurethane sealing gum and making method of nanometer organic montmorillonite silane group organosilicon at modifying end, which comprises the following parts: 100wt% organosilicon modified polyether typed polyurethane of end silane, 5-20wt% nanometer organic montmorillonite, 5-150wt% mineral filler and 0.2-1.5wt% catalyst. The invention realizes the reinforcing and toughening effect of end silane polyurethane seal gum simultaneously due to the boundary interaction between nanometer organic montmorillonite and polymer base, which improves the stretching strength and fracture extensibility more than the formulation without montmorillonite.

Description

technical field [0001] The invention relates to the field of sealants, in particular to a nano-organic montmorillonite-modified silyl-terminated silicone-modified polyurethane sealant and a preparation method thereof. Background technique [0002] As a new type of polymer material and raw material for adhesives and sealants, silyl-terminated polyurethane is attracting more and more attention. Silane-terminated polyurethane is compatible with the advantages of both silicone sealants and polyurethane sealants, and can be cured at room temperature with the help of moisture in the air, and will not emit CO due to curing. 2 However, foaming phenomenon occurs, the comprehensive performance is more excellent, and it has great market potential. [0003] Silicone-polyurethane copolymer is a new type of polymer material. From the perspective of molecular segment structure, it contains silicone segments with excellent dielectric properties, flexibility, water resistance, air permeabil...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K3/10C09J175/08
Inventor 刘伟区王文荣
Owner 海南中科翔新材料科技有限公司
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