Heat-resistant single-component moisture-curing polyurethane sealant and preparation method thereof

A polyurethane sealant, one-component technology, applied in the field of sealants, can solve the problems of poor thermal stability, bubbles and cracks, etc., to improve heat resistance, expand the use range, avoid bubbling and mechanical performance decline

Active Publication Date: 2015-05-27
SHANGHAI DIMU NEW MATERIAL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In view of the poor thermal stability of the existing one-component room temperature moisture-curing polyurethane glue, and the problems of bubbles and cracks that may occur in high-temperature thermal

Method used

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  • Heat-resistant single-component moisture-curing polyurethane sealant and preparation method thereof
  • Heat-resistant single-component moisture-curing polyurethane sealant and preparation method thereof
  • Heat-resistant single-component moisture-curing polyurethane sealant and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0041] For the heat-resistant one-component moisture-curing polyurethane sealant composed of the above-mentioned components according to the corresponding proportion, the present invention also provides a corresponding preparation method, the method comprising the following steps:

[0042] (1) Take the polyol compound, plasticizer and diluent and put them into the vacuum reaction kettle, dehydrate under the vacuum environment of 100°C-130°C for 1-5 hours until the water content of the mixture is lower than 0.01%, and then put the vacuum reaction The temperature of the material in the kettle is lowered to 40-60°C, and the measured isocyanate compound is added, stirred and heated to 75-85°C in a vacuum environment, and reacted for 3-7h until the isocyanate content of the system reaches the theoretical value, and the NCO-terminated polyurethane prepolymerized things.

[0043](2) At room temperature, sequentially add plasticizer, NCO-terminated compound, water scavenger, and exten...

Example Embodiment

[0047] Example one

[0048] Preparation of NCO-terminated polyurethane prepolymer:

[0049] 250kg polyether trihydric alcohol (average molecular weight 4700), 290kg polyether diol (average molecular weight 2000) and 180kg diisooctyl phthalate were vacuum dehydrated at 100°C for 5 hours until the water content of the mixture was less than 0.01%, then reduce the material temperature of the vacuum reactor to 40-60°C, add 63kg of toluene diisocyanate, stir in a vacuum environment and heat up to 85°C, react for 5h until the isocyanate content of the system reaches 1.1%, and obtain terminal NCO groups Polyurethane prepolymers.

[0050] Preparation of heat-resistant one-component moisture-curing polyurethane sealant:

[0051] At room temperature, sequentially add 4.7 parts of plasticizers, 57.7 parts of NCO-terminated compounds, 1.1 parts of p-toluenesulfonyl isocyanate moisture scavenger, and mix and stir for 20-40 minutes, then add 5.6 parts of calcium carbonate, Mix and stir 19...

Example Embodiment

[0052] Embodiment two

[0053] Preparation of NCO-terminated polyurethane prepolymer:

[0054] 250kg polyether trihydric alcohol (average molecular weight 4700), 290kg polyether diol (average molecular weight 2000) and 180kg diisooctyl phthalate were vacuum dehydrated at 100°C for 5 hours until the water content of the mixture was less than 0.01%, then reduce the material temperature of the vacuum reactor to 40-60°C, add 63kg of toluene diisocyanate, stir in a vacuum environment and heat up to 85°C, react for 5h until the isocyanate content of the system reaches 1.1%, and obtain terminal NCO groups Polyurethane prepolymers.

[0055] Preparation of heat-resistant one-component moisture-curing polyurethane sealant:

[0056] At room temperature, sequentially add 9.8 parts of plasticizers, 47.8 parts of NCO-terminated compounds, and 1.2 parts of p-toluenesulfonyl isocyanate into a double planetary kettle, mix and stir for 20-40 minutes, then add 9.3 parts of calcium carbonate, 2...

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Abstract

The invention discloses a heat-resistant single-component moisture-curing polyurethane sealant and a preparation method thereof. By adopting a manner of adding a delayed curing agent into a system, the storage at normal temperature and deblocking of reactive hydrogen at a high temperature can react with terminal NCO group of a polyurethane prepolymer. Therefore, the polyurethane sealant comprises the following components in percentage by mass: 30-50% of terminal NCO group polyurethane prepolymer, 20-25% of plasticizer, 1-10% of high-temperature curing agent, 5-15% of increment filler, 22-25% of reinforcing filler, 0.1-5% of thixotropic agent, 0-20% of coloring agent, 0.5-1.5% of adhesion promoter, 0.01-0.05% of catalyst, 1-5% of diluting agent, and 0.5-2% of moisture scavenging agent. The heat resistance of the single-component polyurethane sealant under the condition of different curing degrees can be enhanced, the blister and mechanical performance reduction phenomena under a high-temperature condition can be effectively avoided, and the usage range can be greatly extended.

Description

technical field [0001] The invention relates to a sealant, in particular to a polyurethane sealant and its preparation technology. Background technique [0002] Polyurethane sealant (polyurethane sealant) is a sealant mainly composed of polyurethane rubber and polyurethane prepolymer. It can be divided into three types: heating vulcanization type, room temperature vulcanization type and hot melt type. [0003] Among them, the room temperature vulcanization type is divided into one-component and two-component, and the one-component room temperature moisture-curing polyurethane adhesive is more and more widely used in automobiles. It is a reactive sealant that contains terminal in its main material. Isocyanate groups can react with moisture in the air at room temperature to form high-strength elastomers. It has high mechanical strength, good elasticity, excellent adhesion, wear resistance and low temperature flexibility, and is widely used in buildings, squares, roads as cau...

Claims

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Application Information

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IPC IPC(8): C09J175/04C09J175/08C09J175/06C09J11/04C09J11/06C09J11/08C08G18/10
Inventor 赵凤艳谢平艾飞张义
Owner SHANGHAI DIMU NEW MATERIAL TECH
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