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Cross-linking agent, polyurethane prepolymer and one-component polyurethane adhesive

A technology of polyurethane prepolymer and crosslinking agent, which is applied in the direction of polyurea/polyurethane adhesive, adhesive, adhesive type, etc., can solve the problems of high mechanical performance and tensile performance, and achieve high mechanical performance and huge application Excellent value and overall performance

Active Publication Date: 2020-11-10
GUANGZHOU BAIYUN CHEM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The method of adjusting its microscopic network-like molecular structure and its phase separation state through soft and hard segments cannot take into account high mechanical properties and excellent tensile properties at the same time

Method used

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  • Cross-linking agent, polyurethane prepolymer and one-component polyurethane adhesive
  • Cross-linking agent, polyurethane prepolymer and one-component polyurethane adhesive
  • Cross-linking agent, polyurethane prepolymer and one-component polyurethane adhesive

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preparation example Construction

[0066] The preparation method of the polyurethane prepolymer needs only to polymerize the above-mentioned polymerizable composition. For example: take polyisocyanate, polyether polyol, polydimethylsiloxane, the crosslinking agent, and the first catalyst, and mix and react. The method of aggregation is not particularly limited. The order of adding each substance can be carried out according to conventional operations known to those skilled in the art.

[0067] In one embodiment, the temperature of the polymerization reaction is 40° C. to 80° C., and the reaction time is 1 h to 5 h. It can be understood that the way of mixing includes but not limited to stirring.

[0068] The present invention further provides a one-component polyurethane glue, the raw materials of which include: the above-mentioned polyurethane prepolymer, inorganic filler, coupling agent and second catalyst.

[0069] In one embodiment, the one-component polyurethane glue, in parts by weight, its raw materia...

Embodiment 1

[0081] Embodiment 1: the preparation of crosslinking agent

[0082] This embodiment provides a rotaxane crosslinking agent and a preparation method thereof. The preparation method is carried out according to the following synthetic route:

[0083]

[0084]

[0085] The preparation method specifically comprises the following steps:

[0086] Step 1: Add 100 parts of bisaldehyde dibenzo-24-crown-8 and 60 parts of dehydrated glycerol to 250 parts of tetrahydrofuran, then add 2 parts of p-toluenesulfonic acid catalyst, and heat to reflux at 100 ° C Stir azeotropically for 4 hours. The reaction solution was NaCO 3 washed with aqueous solution, and the organic layer was washed with K 2 CO 3 After drying, a white solid was obtained by rotary evaporation with a yield of 92%.

[0087] Product H NMR spectrum 1 HNMR (400MHz, CDCl 3 ), (TMS, ppm): δ=1.72-1.73 (two hydrogens on the six-membered ring of acetal); 3.49-3.51 (four hydrogens on the carbon to which the hydroxyl gro...

Embodiment 2

[0097] Embodiment 2: the preparation of polyurethane prepolymer (A)

[0098] Take 100 parts of Korean Kumho LL type liquefied MDI and 50 parts of polyether polyol of Nanjing Boben Polyurethane Co., Ltd. PPG-1000 type, add 0.1 part of stannous octoate catalyst, and accelerate the stirring reaction at 50 ° C for 2 hours . Then add 2 parts (ammonia value: 2 mmol / g, molecular weight: 1000) of amino-terminated amino silicone oil, and react for 1 hour. Thereafter, 5 parts of the cross-linking agent solution prepared in Example 1 were added, and the reaction was continued with stirring for 4 hours, followed by vacuum defoaming at 40° C. to 50° C. for 2 hours. The viscosity of the prepared polyurethane prepolymer (A) is 80000-125000mPa.s (25°C).

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Abstract

The present invention relates to a cross-linking agent, wherein the main component of which is rotaxane comprising a long-chain axis molecule and at least one cyclic molecule that encloses the axis molecule, wherein the rotaxane introduces side chains or tail chains containing active hydrogen groups to at least two parts of the cyclic molecule and to long-chain parts, located on the two sides of the cyclic molecule, of the axial molecule respectively, and the total number of the active hydrogen groups is at least four. The invention further relates to a polyurethane prepolymer and a one-component polyurethane adhesive.

Description

technical field [0001] The invention relates to the technical field of adhesives, in particular to a crosslinking agent, a polyurethane prepolymer and a one-component polyurethane adhesive. Background technique [0002] Polyurethane adhesives have the advantages of adjustable hardness, low temperature resistance, good flexibility, and high bonding strength. They can bond metals, non-metals and other materials. They are more and more widely used and are very important for commerce and industry. s material. Traditional one-component polyurethane adhesives usually consist of polyurethane resins, fillers and other additives. Among them, the resin part is often prepared by reacting polyether polyol, polyester polyol, chain extender or multifunctional crosslinking agent with isocyanate raw materials, and the molecular structure is often adjusted by the ratio of soft and hard segments, supplemented by auxiliary Agents and fillers are used to adjust the mechanical properties to me...

Claims

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Application Information

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IPC IPC(8): C08G18/32C08G18/76C08G18/66C08G18/48C08G18/10C09J175/08
CPCC08G18/3206C08G18/3819C08G18/7671C08G18/48C08G18/10C09J175/08C08G18/61
Inventor 宋骏唐龙陈建军黄恒超
Owner GUANGZHOU BAIYUN CHEM IND
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