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Single-component thermosetting polyurethane modified epoxy structural adhesive and preparation method thereof

A polyurethane modification, epoxy structural adhesive technology, applied in epoxy resin adhesives, polyurea/polyurethane adhesives, adhesives, etc., can solve the problem of slow curing speed, long operation time of two-component polyurethane structural adhesives, and difficult application Fast and continuous automation of structural adhesive bonding operations, etc., to achieve the effects of high adhesion, fast curing adhesion, and reduced equipment costs and labor costs

Pending Publication Date: 2022-04-01
YANTAI DARBOND TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] According to the above deficiencies in the prior art, the purpose of the present invention is to provide a one-component thermosetting polyurethane modified epoxy structural adhesive and its preparation method, aiming at solving the problem of long operating time of the two-component polyurethane structural adhesive during use. , the curing speed is slow, and it is difficult to apply to the problem of rapid and continuous automatic structural adhesive bonding operations

Method used

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  • Single-component thermosetting polyurethane modified epoxy structural adhesive and preparation method thereof
  • Single-component thermosetting polyurethane modified epoxy structural adhesive and preparation method thereof
  • Single-component thermosetting polyurethane modified epoxy structural adhesive and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] (1) Preparation of polyurethane prepolymer:

[0032] Add 50g of polytetrahydrofuran diol with a molecular weight of 250g / mol to the reaction kettle and raise the temperature to 120°C, vacuum dehydrate for 2 hours, cool down to 50°C, add TDI 70g, slowly raise the temperature to 80°C, keep the temperature, and react for 2 hours.

[0033] (2) Preparation of closed polyurethane:

[0034] Add 18 g of 1-methyl-5-hydroxypyrazole to 50 g of the above polyurethane prepolymer, heat up to 50° C., and react for 5 hours under nitrogen protection. When NCO is 0, the reaction ends.

[0035] (3) Preparation of one-component heat-cured polyurethane modified epoxy structural adhesive:

[0036] Add 40g of blocked polyurethane, 20g of E51 epoxy resin, 20g of nano-calcium carbonate, 0.5g of white carbon black, 0.1g of antioxidant, 0.5g of silane coupling agent KH790, and 0.1g of dibutyltin dilaurate. Mix well and vacuum defoam.

Embodiment 2

[0038] (1) Preparation of polyurethane prepolymer:

[0039] Add 50g of polycaprolactone diol with a molecular weight of 250g / mol into the reactor, raise the temperature to 120°C, vacuum dehydrate for 2 hours, cool down to 50°C, add 70g of TDI, slowly raise the temperature to 80°C, keep the temperature, and react for 2 hours.

[0040] (2) Preparation of closed polyurethane:

[0041] Add 15 g of 2-methylimidazole to 50 g of the above polyurethane prepolymer, raise the temperature to 50° C., and react for 5 hours under nitrogen protection. When the NCO is 0, the reaction ends.

[0042] (3) Preparation of one-component heat-cured polyurethane modified epoxy structural adhesive:

[0043] Add 40g of closed polyurethane, 20g of polyurethane epoxy resin, 20g of nano-calcium carbonate, 0.5g of white carbon black, 0.1g of antioxidant, 0.5g of silane coupling agent KH790, 0.1g of dibutyltin dilaurate, mix well, and vacuum remove Bubble.

Embodiment 3

[0045] (1) Preparation of polyurethane prepolymer:

[0046] Add 50g of polytetrahydrofuran diol with a molecular weight of 250g / mol to the reaction kettle and raise the temperature to 120°C, vacuum dehydrate for 2 hours, cool down to 50°C, add 65g of HDI, slowly raise the temperature to 80°C, keep the temperature, and react for 2 hours.

[0047](2) Preparation of closed polyurethane:

[0048] Add 18 g of 1-methyl-5-hydroxypyrazole to 50 g of the above-mentioned polyurethane prepolymer, heat up to 50° C., and react for 5 hours under nitrogen protection. When NCO is 0, the reaction ends.

[0049] (3) Preparation of one-component heat-cured polyurethane modified epoxy structural adhesive:

[0050] Add in sequence 40g of closed polyurethane, 20g of E51 epoxy resin, 20g of nano-calcium carbonate, 0.5g of white carbon black, 0.1g of antioxidant, 0.5g of silane coupling agent KH790, 0.1g of dibutyltin dilaurate, mix well, and vacuum remove Bubble.

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Abstract

The invention provides a single-component thermosetting polyurethane epoxy structural adhesive and a preparation method thereof, and the epoxy structural adhesive is prepared from the following components in parts by weight: 30 to 50 parts of blocked polyurethane, 20 to 40 parts of epoxy resin, 10 to 30 parts of filler, 0.1 to 1 part of catalyst and 0.1 to 1 part of assistant. The modified epoxy structural adhesive prepared by the invention can be stored at normal temperature and can be quickly cured within 10 minutes at the temperature of 90 DEG C. Under the heating condition, the epoxy structural adhesive is cured and crosslinked to form a macromolecular interpenetrating network structure, so that the epoxy structural adhesive not only has the flexibility of polyurethane, but also has the hardness, strength and wear resistance of epoxy. The quick curing and high adhesive force are realized. The adhesive can be used for bonding metal and plastic base material structural members in various continuous production scenes. The operation time limitation is avoided, and the equipment cost and the labor cost are greatly reduced.

Description

technical field [0001] The present invention relates to the technical field of adhesives, in particular to a single-component thermosetting polyurethane-modified epoxy structural adhesive and a preparation method thereof, and more specifically to a polyurethane-modified epoxy structural adhesive that is stable in normal temperature storage and fast curing at low temperature. Provide an efficient solution for production line packaging. Background technique [0002] Polyurethane coating materials are widely used in transportation because of their excellent physical and chemical properties, such as excellent adhesion, excellent decoration, comprehensive chemical resistance, especially superior wear resistance and high toughness. , Construction, household appliances, instruments, wooden furniture, waterproof materials, leather products, metal and plastic products and other fields. [0003] Polyurethane and epoxy structural materials can be divided into two types: two-component ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J175/08C09J175/06C09J163/02
Inventor 韩红伟王建斌陈田安解海华
Owner YANTAI DARBOND TECH