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Room-temperature cured two-component polyurethane heat-conducting composition and preparation method thereof

A two-component polyurethane, room temperature curing technology, applied in polyurea/polyurethane adhesives, chemical instruments and methods, non-polymer adhesive additives, etc., can solve leakage, contamination of electronic motherboards, impact on electronic components, etc. problems, to achieve good extrusion flow rate, reduce repair costs, and good tensile flexibility

Active Publication Date: 2021-01-05
杭州应星新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In order to meet the requirements of the continuous dispensing process, Shenzhen Boen CN202010243690, Shenzhen Chaoshuo CN201711090602 and Dongguan Zhaoshun CN201410758830 disclosed a method for preparing a two-component silicone thermally conductive gel, but the silicone thermally conductive gel has a shortcoming: it has been in the High-temperature environment will cause small molecular silicone oil D3-D20 to migrate and precipitate to the surface. Silicone oil will not only pollute the electronic motherboard, but also volatilize and atomize and even affect some important electronic components.
The product viscosity of these technical solutions is less than 10,000 cP, and the thermal conductivity is less than 1.5w / k.m. It will also flow and leak when sizing on a large area.
Therefore, the application field is limited. It is mainly used in the market needs of fixed gap filling and bonding. It is difficult to be suitable for large-area continuous dispensing processes such as new energy battery packs and electronic panels.

Method used

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  • Room-temperature cured two-component polyurethane heat-conducting composition and preparation method thereof

Examples

Experimental program
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Effect test

preparation example Construction

[0021] The preparation method of the NCO-terminated prepolymer includes the following steps: adding 30-70 parts by weight of polyol A, 10-30 parts by weight of plasticizer, and 0.05-0.5 parts by weight of catalyst into a polymerization tank, stirring and raising the temperature to 110 -120°C, vacuum degree <-0.09MPa, dehydration for 1h, cooling down to below 60°C, adding 20-60 parts by weight of polyisocyanate, raising the temperature to 60-90°C, polymerizing for 4-6h to the end, cooling and discharging, to obtain terminal NCO prepolymer.

[0022] Described polyol A and polyol B all comprise small-molecule polyol and / or polymerization polyol; Described small-molecule polyol can enumerate ethylene glycol, diethylene glycol, propylene glycol, dipropylene glycol, tripropylene glycol, 1 , 3-propanediol, 1,3-butanediol, 1,4-butanediol, neopentyl glycol, trimethylpentanediol, etc.; the polymer polyols include polypropylene oxide ether glycol, polytetrahydrofuran Ether diol, poly(pr...

Embodiment 1

[0076] A room temperature curing two-component polyurethane heat-conducting composition, including A component and B component, the weight ratio of A component and B component is 1:1.

[0077] Preparation of component A: Step (1) Put plasticizer A, flame retardant A, dispersant A, antioxidant A, and thermally conductive filler A at 110-120°C and vacuum<-0.09MPa, dewater Stand-by after treatment; step (2): 5kg of PNCO-1, 5kg of plasticizer DOZ, 5kg of flame retardant TCP, 50g of dispersant FA-196, 50g of dewatering agent Ti, 50g of antioxidant 168, 0.3μm modification Non-spherical alumina (named: M-7) 2kg, 3μm modified aluminum nitride (named: M-3) 8kg, 10μm non-shaped spherical alumina 20kg, 40μm spherical alumina 55kg, in planetary stirred tank, vacuum <- Under the pressure of 0.09MPa, vigorously stir and knead evenly, and the material is discharged to obtain component A;

[0078] The thermal conductivity of component A is 2.5±0.2W / mK (AMTS D5470 method), the viscosity is 12...

Embodiment 2

[0083] A room temperature curing two-component polyurethane heat-conducting composition, including A component and B component, the weight ratio of A component and B component is 1:1.

[0084] Preparation of component A: step (1) Pretreatment with plasticizer A, flame retardant A, dispersant A, antioxidant A, and thermally conductive filler A at 100-120°C and vacuum <-0.09MPa to remove water Stand-by; step (2): PNCO-2 2kg, plasticizer DOZ 5kg, flame retardant TCP 3kg, dispersant FA-196 50g, dewatering agent Ti 50g, antioxidant 168 50g, 0.5μm modified nitrogen Aluminum oxide (name: M-3) 1kg, 1μm modified boron nitride (name: M-8) 3kg, 5μm modified non-spherical alumina (name: M-7) 6kg, 10μm non-spherical alumina 20kg, 45kg of 40μm spherical alumina, 15kg of 75μm spherical alumina, in a planetary stirring tank, under vacuum <-0.09MPa, vigorously stir and knead evenly, and discharge to obtain component A;

[0085] The thermal conductivity of component A is 3.3±0.3W / mK (AMTS D547...

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Abstract

The invention belongs to the technical field of heat-conducting compositions, and particularly relates to a room-temperature cured two-component polyurethane heat-conducting composition and a preparation method thereof. The invention provides the room-temperature cured two-component polyurethane heat-conducting composition, the component A and the component B have the same heat-conducting fillingratio which is as high as 80-91%, and the mixed heat-conducting composition has good extrusion flow velocity and thixotropy, does not flow, sag and leak, has the advantages of high continuity and engineering, the stress in the assembling process can be reduced to the minimum, and almost no stress is generated to parts; meanwhile, a cured product is good in tensile flexibility, weak in adhesive force to a base material, convenient to repair, capable of improving efficiency and reducing repair cost, free of VOC emission and flame-retardant V0 level, has the characteristics of being non-toxic, harmless, safe, environmentally friendly and the like, and meets the requirements of European and American related laws and regulations.

Description

technical field [0001] The invention belongs to the technical field of heat-conducting compositions, and in particular relates to a room temperature curing two-component polyurethane heat-conducting composition and a preparation method thereof. Background technique [0002] With the development of new energy vehicles, communications and electronics industries, in addition to requiring thermal interface materials to have performance characteristics such as safety and environmental protection, softness, low stress residue, and flame retardancy, they must also meet the requirements of high power, high energy density and high integration of components. In addition to high heat dissipation requirements; products are also required to be supplied in the form of glue to meet the continuous production line requirements of end customers' dispensing process. In order to meet the requirements of the continuous dispensing process, Shenzhen Boen CN202010243690, Shenzhen Chaoshuo CN2017110...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J175/08C09J11/06C09J11/04C09K5/14
CPCC09J175/08C09J11/06C09J11/04C09K5/14C08K2003/282C08K2003/2227C08L2201/02C08K9/04C08K3/28C08K7/00C08K3/22C08K9/06C08K5/11C08K13/06
Inventor 金勇斌
Owner 杭州应星新材料有限公司