High-initial strength reaction-type polyurethane hot melt adhesive and preparation method thereof

A polyurethane hot-melt adhesive and reactive technology, applied in the direction of polyurea/polyurethane adhesives, adhesives, adhesive types, etc., can solve the problems of low initial adhesion and initial bonding strength, high melt viscosity, etc., and achieve The effect of improving initial adhesion, moderate elastic modulus, and good flexibility

Inactive Publication Date: 2019-09-20
YANTAI TIGHTSEN FINE CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Aiming at the problems of high melt viscosity, low initial tack and low initial bonding strength of the existing reactive polyurethane hot melt adhesive, the present invention provides a high initial strength reactive polyurethane hot melt adhesive and a preparation method thereof

Method used

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  • High-initial strength reaction-type polyurethane hot melt adhesive and preparation method thereof

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Embodiment 1

[0020] A high initial strength reactive polyurethane hot melt adhesive, comprising the following components by weight and corresponding preparation method: crystallized polyester polyol XCP-3000 (20 parts), POL-356 (10 parts), high molecular weight crystal Copolyester ST-260 (6 parts), liquid polyester polyol DYNACOLL7230 (25 parts), liquid polycarbonate diol G4672 (15 parts), thermoplastic polyurethane solid resin Desmocoll 500 (8 parts) antioxidant Irganox1010 ( 0.2 parts) into a four-necked bottle, heated to 160°C to melt for 1 hour, cooled to 110°C for 2 hours in vacuum dehydration, tested for water content ≤ 200PPm, cooled to 60°C, protected by nitrogen, and added liquefied MDI-100 ( 15 parts) reaction, temperature control 85-90 ℃, reaction 2-3h, after the NCO% content of sampling analysis reaches the design value, then add catalyst bismorpholine diethyl ether (0.5 parts), KH590 silane coupling agent (0.3 part) Vacuum stirring and mixing for 30 minutes, heat up to 120°C, ...

Embodiment 2

[0022] A high initial strength reactive polyurethane hot melt adhesive, comprising the following components by weight and corresponding preparation method: Copolymerize crystalline polyester polyol DYNACOLL7380 (18 parts), XCP-3000H (17 parts), high molecular weight crystal Ester S3049 (10 parts), liquid polyester polyol ST8870 (20 parts), liquid polycaprolactone polyol PCL2200C (10 parts), thermoplastic polyurethane solid resin TPU-H306 (5 parts), antioxidant Irganox1010 (0.3 parts) Put it into a four-neck bottle, heat up to 160°C for 1 hour, cool down to 110°C for 2 hours, and vacuum dehydrate it for 2 hours, test that the water content is ≤200PPm, cool down to 60°C, protect with nitrogen, and add liquefied MDI-100 (19 parts) while stirring ) reaction, temperature control 85-90 ° C, reaction 2-3h, after sampling analysis NCO% content reaches the design value, then add catalyst bismorpholine diethyl ether (0.4 parts), KH590 silane coupling agent (0.3 parts) Vacuumize and mix ...

Embodiment 3

[0024]A high initial strength reactive polyurethane hot melt adhesive, comprising the following components by weight and a corresponding preparation method: crystalline polyester polyol DYNACOLL7380 (15 parts), polycaprolactone polyol PCL2302 (10 parts), high Molecular weight polycaprolactone PCL-6400 (6 parts), liquid polyester polyol CP-2059 (30 parts), liquid polycarbonate diol G4672 (15 parts), thermoplastic polyurethane solid resin Pearlbond523 (9 parts) antioxidant Irganox1010 (0.3 parts) into a four-necked bottle, heated to 160°C to melt for 1 hour, cooled to 110°C for 2 hours in vacuum dehydration, tested for water content ≤ 200PPm, cooled to 60°C, protected by nitrogen, and added liquefied MDI-100 while stirring (14 parts) reaction, temperature control 85-90 ℃, reaction 2-3h, after the NCO% content of sampling analysis reaches design value, then add catalyst bismorpholine diethyl ether (0.3 part), KH590 silane coupling agent ( 0.4 parts) Vacuum and stir for 30 minutes...

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Abstract

The invention discloses a high-initial strength reaction-type polyurethane hot melt adhesive. The high-initial strength reaction-type polyurethane hot melt adhesive comprises the following components: in parts by weight, 25-35 parts of crystalline polyester polyol, 30-45 parts of amorphous liquid polyester polyol, 5-10 parts of high-molecular weight crystalline polyester, 6-9 parts of thermoplastic polyurethane, 0.1-0.3 part of an antioxidant, 14-19 parts of MDI, 0.3-0.5 part of a catalyst and 0.3-0.5 part of a silane coupling agent. According to the high-initial strength reaction-type polyurethane hot melt adhesive, a reaction is performed on the crystalline and amorphous polyester polyols with lower molecular weights and aromatic diisocyanate, and high reactivity is achieved; the crystalline copolyester with a high molecular weight is adopted, a high crosslinked density is achieved, and high initial adhesive strength and high final adhesive strength are achieved; and the thermoplastic polyurethane resin with good compatibility with the polyester system is adopted, the initial adhesion is improved, good flexibility can also be maintained, and the problems of hardness increase and flexibility decrease which are brought by fast crystallization and high-molecular-weight polyester which are applied to increase of the initial strength in the prior art are solved.

Description

technical field [0001] The invention relates to the field of adhesives, in particular to a high initial strength reactive polyurethane hot melt adhesive and a preparation method thereof. Background technique [0002] With the rapid development of mobile electronic devices, wearable devices, vehicle-mounted display devices and artificial intelligence devices, terminal display screens are becoming more and more thin, flexible and foldable; the display modules, components and housings of these devices Reactive polyurethane hot-melt adhesives are mostly used for the assembly of structures. [0003] Reactive polyurethane hot-melt adhesive is a kind of polyurethane prepolymer. After hot-melt sizing, it can be rapidly cooled and crystallized to form a certain initial adhesion; excessive active NCO groups interact with moisture in the air, substrate surface moisture and active hydrogen Groups and other reactions, and finally cross-linked into a network structure of polyurethane mac...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J175/06C09J175/04C09J11/06C08G18/42C08G18/44
CPCC08G18/4202C08G18/4211C08G18/4238C08G18/4277C08G18/44C09J11/06C09J175/06C08L75/04C08K5/1345
Inventor 刘铁钢林志秀林绍盛
Owner YANTAI TIGHTSEN FINE CHEM
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