Silane modified polyurethane resin and preparation method thereof

A polyurethane resin and silane modification technology, applied in the field of silane modified polyurethane resin, can solve the problems of poor resistance to hydrocarbon media and poor mechanical strength of resin

Inactive Publication Date: 2017-04-26
WANHUA CHEM GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The object of the present invention is to provide a kind of silane-modified polyurethane resin, introduce poly(meth)acrylate structure in polyurethane main chain and/or side chain structu

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0074] The preparation of silane modified polyurethane prepolymer: 400g number average molecular weight is 2000 Add 2056 (Wanhua Chemical) and 133.2g IPDI into a 5L three-necked flask, preheat to 50-60°C while stirring, add 0.1g stannous octoate catalyst and react at 60°C for 2 hours, then add 117.6g γ-mercaptopropane Trimethoxysilane continued to react for 1 h to obtain a silane-modified polyurethane prepolymer.

[0075] After that, the polymethacrylate (functionality=5.4; number average molecular weight=9300g / mol; glass transition temperature=-5°C; methyl methacrylate / styrene / butyl acrylate / methyl methacrylate) added to the system The molar ratio of hydroxyethyl acrylate = 1:0.3:2:1.3 (prepared by free radical polymerization) 344.4g and N,N-dimethylformamide 2L mixed solution, reacted for 2 hours, and heated in vacuum to remove the solvent.

[0076] The above-mentioned silane-modified polyurethane was cast into a film with a thickness of 2 mm, and cured for 21 days at a te...

Embodiment 2

[0078] Preparation of silane-modified polyurethane prepolymer: 200g polycarbonate polyol (Asahi Kasei; T5651, number average molecular weight is 1000g / mol, functionality=2), 200g polymethacrylate (functionality=2.1; number average Molecular weight=2000, glass transition temperature=-23°C; methyl methacrylate / isooctyl acrylate / hydroxyethyl methacrylate molar ratio=1:2.7:1.2 prepared by free radical polymerization) and 116.7g TDI was added to In a 3L three-necked flask, preheat 50-60°C while stirring, add 0.1g of stannous octoate catalyst and react at 60°C for 2h, then add 158g of anilinomethyltriethoxysilane and continue the reaction for 1h to obtain silane-modified Polyurethane prepolymers.

[0079] After that, 400 g of polyether polyol (Gaoqiao Petrochemical; GEP-828, number average molecular weight 6000, functionality=3) and 200 mL of acetone were added to the system, and the reaction was continued for 5 h.

[0080] The above-mentioned silane-modified polyurethane was cast ...

Embodiment 3

[0082] Preparation of silane-modified polyurethane prepolymer: 400g polymethacrylate (functionality=2.1; number average molecular weight=4000g / mol, glass transition temperature=-8°C; methyl methacrylate / isooctyl acrylate / butyl acrylate / hydroxyethyl methacrylate molar ratio=1:1.3:1.8:1 prepared by free radical polymerization) and 150gMDI into a 5L three-necked flask, preheated to 50-60°C while stirring, added 0.1 g of tin neodecanoate catalyst was reacted at 60°C for 2 h, and then 165 g of cyclohexylaminomethyltriethoxysilane was added to continue the reaction for 1 h to obtain a silane-modified polyurethane prepolymer.

[0083] Then add 1600g polymethacrylate (functionality=5; number average molecular weight=20000g / mol; glass transition temperature=-17°C; ethyl methacrylate / butyl acrylate / isooctyl acrylate / The molar ratio of hydroxyethyl methacrylate = 1:1.5:1.3:1.3 (prepared by atom transfer radical polymerization) and N,N-dimethylformamide 2L solution, reacted for 2 hours,...

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Abstract

The invention provides silane modified polyurethane resin and a preparation method thereof. The resin is prepared by reaction of the following raw materials: (a) a polyisocyanate; (b) a component which comprises (b1) poly(methyl)acrylate containing a NCO reactive group and /or (b2) a polyol; (c) a silane coupling agent; (d) a component which comprises (d1) poly(methyl)acrylate containing a NCO reactive group and /or (d2) a polyol; and the raw materials contain at least one of the (b1) and the (d1). Through introduction of a poly(methyl)acrylate structure onto a branched chain and/or the main chain of the silane modified polyurethane resin, the hydrocarbon medium resistance and weather resistance of the silane modified polyurethane resin are greatly improved; and siloxy for improving polyurethane water resistance and heat resistance is introduced. The silane modified polyurethane resin solves the problems of poor mechanical strength and hydrocarbon medium resistance of the resin.

Description

technical field [0001] The invention relates to a silane-modified polyurethane resin, in particular to a silane-modified polyurethane resin containing a poly(meth)acrylate structure. Background technique [0002] Polyurethane has the characteristics of high bonding strength, wear resistance, high mechanical strength and good vibration absorption performance, and is widely used in the fields of adhesives, sealants and elastomers. However, due to the existence of free isocyanate, as well as weak heat resistance and water resistance, the application of polyurethane systems in more fields is limited. Based on the above problems, a silane-modified polyurethane system was developed. [0003] Silane-modified polyurethane (SPUR) is the reaction of the terminal isocyanate group of the polyurethane prepolymer into a siloxyl group, and the main chain is a polyurethane segment. The water resistance and heat resistance of silane-terminated polyurethane are improved by introducing weak ...

Claims

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Application Information

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IPC IPC(8): C08G18/66C08G18/48C08G18/38C08G18/62C08G18/44C08G18/42C08G18/65C08G18/12
CPCC08G18/48C08G18/12C08G18/289C08G18/42C08G18/44C08G18/6229C08G18/62
Inventor 于深蒋凤娟张文生庞德政孙军坤齐旺顺
Owner WANHUA CHEM GRP CO LTD
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