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A kind of synthetic method and application of silane-terminated polyurethane prepolymer

A polyurethane prepolymer and silane-capped technology, which is applied in the direction of polyurea/polyurethane adhesives, adhesive types, adhesive additives, etc., can solve poor adhesion, low alkoxy functionality, and NCO group blocking Insufficient efficiency and other problems, to achieve the effect of wet bonding and reduce surface energy

Active Publication Date: 2017-09-26
YANTAI DARBOND TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In order to solve the problems in the prior art that the sealing rate of the relative terminal NCO group is incomplete, the alkoxyl functionality is low, and the adhesion is poor, the invention provides a silane-terminated polyurethane oligomer with alkoxyl functionality Up to 8-10, this prepolymer can be widely used in adhesive formulations, can significantly increase the storage stability of the adhesive and improve the interface adhesion

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0015] Weigh 132 grams of polyether diol (commercially available brand is D2120, hydroxyl value 56) into a three-necked flask, vacuum dehydrate at 120±5°C for 2.5 hours, then cool down to below 60°C, add and measure in portions 100 grams of diphenylmethane diisocyanate (MDI-100), control the reaction temperature at 80±5°C, and react for 2 hours;

[0016] After the time is up, cool down to 50°C, and start to add 188 grams of bis[3-(triethoxysilyl)propyl]amine (commercially available as Dynasylan 1122) dropwise with a dropping funnel at a rate of 1-2 drops per second After the dropwise addition is completed, control the reaction temperature to 80±5°C and continue the reaction for 2 hours. After the reaction is completed, cool down and fill with nitrogen for protection; after the reaction is completed, cool down and fill with nitrogen for protection;

[0017] Start to add 100 grams of N-n-butyl-3-aminopropyltrimethoxysilane (commercially available as Dynasylan 1189) dropwise with...

Embodiment approach 2

[0019] Weigh 132 grams of polyether diol (commercially available brand is D2120, hydroxyl value 56) into a three-necked flask, vacuum dehydrate at 120±5°C for 2.5 hours, then cool down to below 60°C, add and measure in portions 100 grams of diphenylmethane diisocyanate (MDI-100), control the reaction temperature at 80±5°C, and react for 2 hours;

[0020] After the time is up, cool down to 50°C, and start to add 150 grams of bis[3-(trimethoxysilyl)propyl]amine (commercially available as Dynasylan 1124) dropwise with a dropping funnel at a rate of 1-2 drops per second. After the dropwise addition is completed, control the reaction temperature to 80±5°C and continue the reaction for 2 hours. After the reaction is completed, cool down and fill with nitrogen for protection; after the reaction is completed, cool down and fill with nitrogen for protection;

[0021] Start to add 90 grams of N-n-butyl-3-aminopropyltrimethoxysilane (commercially available as Dynasylan1189) dropwise with...

Embodiment 3

[0022] Embodiment 3: The prepolymer is applied to the adhesive.

[0023] 350 parts of the prepolymer of Example 1 of the present invention, 39 parts of hydrophobic fumed silicon, and 0.4 parts of dibutyltin dilaurate were uniformly kneaded under anhydrous conditions to prepare a bonding adhesive. After the adhesive is cured at room temperature for 24 hours, the aluminum-aluminum bonding strength can reach 5-6 MPa, and after 7 days of room temperature curing, the aluminum-aluminum bonding strength can reach more than 10 MPa, showing excellent bonding force. The adhesive has an initial viscosity of 450 Pa.s, and after being stored in a sealed container at room temperature for 21 days, the viscosity is 460 Pa.s, showing good storage stability.

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PUM

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Abstract

The invention relates to a snthetic method and application of a silicon alkane terminated polyurethane prepolymer. The synthetic method comprises the steps of: firstly enabling diphenyl methane diisocyanate to react with polyether diol so as to generate a NCO-terminated reactant, then, enabling the NCO-terminated reactant to perform a polyreaction with bis-(- ( 3- methoxyl group silicon propyl ) amine or bis-[- 3-(triethoxysily propyl)]amine, after polyreaction, dropwise adding an appropriate amount of N- n-butyl -3- aminopropyl-trimethoxysilane to enable the un-completely-terminaed NCO functional groups to be totally terminated, and adjusting the consistency so as to obtain the silicon alkane terminated polyurethane prepolymer. The prepolymer can be widely applied in an adhesive formula, can obviously improve the ageing resistance of an adhesive and improve the interface adhesivity.

Description

technical field [0001] The invention relates to a synthesis method and application of a silane-terminated polyurethane prepolymer. Background technique [0002] In recent years, the application technology of silane-terminated polyurethane has become more and more extensive. The usual technical route is to first react with polyether or polyester diol and diisocyanate to obtain an isocyanate-terminated polyurethane prepolymer, and then react with siloxysilane with active hydrogen to obtain a silane-terminated polyurethane prepolymer. The prepolymer obtained based on this synthesis method is a linear oligomer, the sealing rate of the relative terminal NCO group is incomplete, and the functionalization of silane is relatively low. It is applied to the raw material complex of the adhesive. First, the pre-designed adhesive cannot be effectively obtained. Second, storage stability and weather resistance cannot be effectively improved. Contents of the invention [0003] In order...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G18/48C08G18/76C08G18/66C08G18/38C08G18/10C09J175/08C09J175/04C09J11/04C09J11/06
CPCC08G18/10C08G18/3893C08G18/4825C08G18/6696C08G18/7671C08K3/34C08L2205/02C09J175/04C09J175/08C08L75/08C08L101/00C08K5/357
Inventor 许愿王建斌陈田安解海华
Owner YANTAI DARBOND TECH