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Low-tensile-modulus one-component moisture cured polyurethane sealant and preparation method thereof

A technology of polyurethane sealant and tensile modulus, which is applied in the direction of polyurea/polyurethane adhesive, adhesive, adhesive type, etc., can solve the problem of inability to seal and waterproof, reduce tensile strength, and failure of elongation at break To achieve the ideal value and other problems, to achieve the effect of excellent comprehensive mechanical properties

Inactive Publication Date: 2016-04-20
安徽万诚达新型材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the current one-component moisture-curing polyurethane sealant has a high tensile modulus at low temperature, resulting in poor elastic recovery and low elongation at break at low temperature, and it is easy to cause polyurethane sealant to break under stress and vibration conditions. Resulting in no sealing and waterproof effect
Although there are some modification methods that can keep the tensile modulus at a low level under low temperature conditions, they often greatly reduce the tensile strength, resulting in the loss of mechanical properties, and the elongation at break cannot reach the ideal value, which directly restricts the polyurethane Application of sealants in special climatic conditions

Method used

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  • Low-tensile-modulus one-component moisture cured polyurethane sealant and preparation method thereof

Examples

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Effect test

Embodiment 1

[0019] A low tensile modulus one-component moisture-curing polyurethane sealant, which is composed of the following raw materials by weight: 15 parts of isophorone diisocyanate, 45 parts of two-functional polyether polyol, three-functional polyol 10 parts of ether polyol, 0.4 part of dibutyltin dilaurate, 22 parts of calcium carbonate, 6 parts of hydrophobically modified fumed silica, 0.6 part of oxazolidinone, and 1 part of black iron oxide.

[0020] The preparation method of the low tensile modulus polyurethane sealant of the present embodiment is as follows:

[0021] Step 1. Add 45g of difunctional polyether polyol and 15g of trifunctional polyether polyol into the stirred tank, vacuumize the stirred tank and heat it to 110°C for dehydration for 2 hours;

[0022] Step 2: Cool down the stirred tank to 40°C, add 15g of isophorone diisocyanate and mix evenly, then add 0.4g of dibutyltin dilaurate, raise the temperature to 90°C for 2 hours, then cool down to room temperature; ...

Embodiment 2

[0026] A low tensile modulus one-component moisture-curing polyurethane sealant, which is composed of the following raw materials by weight: 21 parts of isophorone diisocyanate, 38 parts of two-functional polyether polyol, three-functional polyol 17 parts of ether polyol, 0.15 part of dibutyltin dilaurate, 26 parts of calcium carbonate, 5.5 parts of hydrophobically modified fumed silica, 1.2 parts of oxazolidinone, and 0.8 part of black iron oxide.

[0027] The preparation method of the low tensile modulus one-component moisture-curing polyurethane sealant of this embodiment is the same as that of Embodiment 1.

Embodiment 3

[0029] A low tensile modulus one-component moisture-curing polyurethane sealant, which is composed of the following raw materials by weight: 23 parts of isophorone diisocyanate, 33 parts of two-functional polyether polyol, three-functional polyol 19 parts of ether polyol, 0.25 part of dibutyltin dilaurate, 29 parts of calcium carbonate, 9 parts of hydrophobically modified fumed silica, 1.4 parts of oxazolidinone, and 0.6 part of black iron oxide.

[0030] The preparation method of the low tensile modulus one-component moisture-curing polyurethane sealant of this embodiment is the same as that of Embodiment 1.

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Abstract

The invention discloses a low-tensile-modulus one-component moisture cured polyurethane sealant. The low-tensile-modulus one-component moisture cured polyurethane sealant is prepared from, by weight, 15-25 parts of isophorone diisocyanate, 30-45 parts of two-functionality polyether polyol, 10-20 parts of three-functionality polyether polyol, 0-0.5 part of dibutyltin dilaurate, 20-30 parts of calcium carbonate, 5-10 parts of hydrophobic modified gas-phase silicon dioxide, 0.5-1.5 parts of oxazolidinone and 0.5-1.5 parts of iron oxide black. The invention further provides a method for preparing the low-tensile-modulus one-component moisture cured polyurethane sealant. The one-component moisture cured polyurethane sealant still has lower tensile modulus at low temperature; meanwhile, the one-component moisture cured polyurethane sealant further has good tensile strength and excellent elongation at break and elastic recovery, and the comprehensive mechanical property is excellent.

Description

technical field [0001] The invention relates to the technical field of polyurethane waterproof materials, in particular to a low tensile modulus one-component moisture-cured polyurethane sealant and a preparation method thereof. Background technique [0002] One-component polyurethane sealant is relative to two-component polyurethane sealant. Two-component polyurethane sealants need to be mixed evenly in proportion to achieve the effect of bonding and sealing when using two-component polyurethane sealant; while one-component polyurethane sealant is used directly, which is convenient, simple and easy to construct. One-component moisture-curing polyurethane sealant means that one-component polyurethane adhesive is cured by reacting with a small amount of water vapor in the air, and reacts with active groups on the surface of the substrate to play a bonding role. [0003] Since the mid-1970s, one-component moisture-curing polyurethane sealants have been more and more widely us...

Claims

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Application Information

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IPC IPC(8): C09J175/08C09J11/04C08G18/48C08G18/24
CPCC09J175/08C08G18/246C08G18/4812C08K3/36C09J11/04
Inventor 吕万青王建王姣
Owner 安徽万诚达新型材料有限公司
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