Polyurethane pouring sealant without settlement during long-term storage and preparation method therefor

A long-term storage and potting glue technology, applied in the direction of adhesive additives, non-polymer adhesive additives, etc., can solve the problems of settlement, reduce the use range, and unusability, and achieve the effect of ensuring mechanical properties

Inactive Publication Date: 2015-08-26
HUBEI HUITIAN NEW MATERIALS STOCK CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At such a low viscosity, if inorganic fillers are added to the potting compound, the fillers will settle in a short time and cannot be used
Especially when the particle size of the inorganic filler is large, and when the added amount exceeds 40%, according to the test, the sedimentation amount of the filler can reach more than 20% in 60 days, and it cannot be used.
And if no inorganic filler is added, the cost will be greatly increased and the scope of use will be greatly reduced.

Method used

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  • Polyurethane pouring sealant without settlement during long-term storage and preparation method therefor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Embodiment 1: add castor oil polyol 15%Wt, polyether diol 17.5%Wt, polyether tribasic alcohol 5%Wt, dibutyl phthalate 5%Wt and sebacic acid two in the there-necked flask Octyl ester 5% Wt, heated to 100-120°C, stirred and dehydrated under vacuum for 1-2 hours, then cooled to 60°C, added to planetary stirring mixer, then added fumed silica 3.0%Wt, 0.5% Wt of the coupling agent, 0.1% Wt of the catalyst, stirred at high speed for 1 hour in a vacuum state, then added 48.9% Wt of heavy calcium carbonate, stirred for 2 hours in a vacuum state, and discharged. B component is liquefied diphenylmethane diisocyanate. According to A:B=4:1 (mass ratio), it can be used after being fully mixed.

Embodiment 2

[0017] Embodiment 2: add castor oil polyol 13%Wt, polyether diol 15%Wt, polyether tribasic alcohol 8%Wt, dibutyl phthalate 5%Wt and sebacic acid two in the there-necked flask Octyl ester 5% Wt, heated to 100-120°C, stirred and dehydrated under vacuum for 1-2 hours, then cooled to 60°C, added to planetary stirring mixer, then added organic bentonite 3.0% Wt, coupling 1.0% Wt agent, 0.1% Wt catalyst, stirred at high speed for 1 hour in a vacuum state, then added 49.9% Wt of heavy calcium carbonate, stirred in a vacuum state for 2 hours, and discharged. Component B is a mixture of 50% Wt of polymethylene polyphenyl polyisocyanate and 50% Wt of liquefied diphenylmethane diisocyanate. According to A:B=3.5:1 (mass ratio), it can be used after being fully mixed.

Embodiment 3

[0018] Embodiment 3: add castor oil polyol 10%Wt, polyether glycol 10%Wt, polyether trihydric alcohol 10%Wt, dibutyl phthalate 2%Wt and sebacic acid in there-necked flask Dioctyl ester 3% Wt, heated to 100-120°C, stirred and dehydrated under vacuum for 1-2 hours, then cooled to 60°C, added to planetary stirring mixer, and then added hydrogenated castor oil derivative liquid stream 1.5% variable aid, 1.0% Wt coupling agent, 0.2% Wt catalyst, stirred at high speed under vacuum for 1 hour, then added 62.3% Wt of heavy calcium carbonate, stirred under vacuum for 2 hours, and discharged. Component B is a mixture of 50% W t of polymethylene polyphenyl polyisocyanate and 50% W t of liquefied diphenylmethane diisocyanate. According to A:B=3:1 (mass ratio), it can be used after being fully mixed.

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Abstract

The invention provides a polyurethane pouring sealant without settlement during long-term storage and a preparation method therefor, and belongs to dual-component polyurethane pouring sealant technology field. The pouring sealant mainly solves the problem that a present pouring sealant cannot be used caused by settlement in a short time. The pouring sealant is characterized in that the pouring sealant comprises A and B with a weight ratio of 2-4:1; the A ingredient comprises, by weight, 10%-35% of castor oil polyols, 10%-40% of polyether diol, 5%-25% of polyether triol, 5%-35% of plasticizers, 30%-70% of inorganic filling materials, 0.5%-3% of rheological auxiliary agents, 0.5%-3% of coupling agents and 0.1%-0.5% of catalysts. The B ingredient is an isocyanate curing agent containing liquefied methyl diphenylene diisocyanate. The pouring sealant has characteristics of low viscosity, high solid content, being capable of long-term storage without settlement and low cost. The pouring sealant is mainly used for bonding, sealing, pouring and coating protection of electronic components in the electronic industry.

Description

technical field [0001] The invention belongs to the two-component polyurethane potting glue, which has the characteristics of low viscosity, high solid content, long-term storage without settlement, low cost, etc., and can be widely used in the bonding, sealing, potting and coating of electronic components in the electronic industry Protect. Background technique [0002] Potting glue, also known as electronic glue, is a broad term and has been widely used in the electronic device manufacturing industry. It is used for bonding, sealing, potting and coating protection of electronic components in the electronics industry. It is an indispensable important insulating material. Potting is to mechanically or manually pour liquid raw materials into devices equipped with electronic components and circuits, and solidify them into thermosetting polymer insulation materials with excellent performance under normal temperature or heating conditions. With the rapid development of the el...

Claims

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Application Information

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IPC IPC(8): C09J175/08C09J11/04C09J11/06C08G18/76C08G18/67C08G18/48
Inventor 冯涛杨足明韩胜利吴正明
Owner HUBEI HUITIAN NEW MATERIALS STOCK CO LTD
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