Flexible epoxy resin composition with hyperbranched structure and synthesis method thereof

Abstract

The invention relates to a flexible epoxy resin composition with a hyperbranched structure and a synthesis method thereof. The flexible epoxy resin composition comprises the following ingredients in parts by weight: 25-40 parts of epoxy resin, 15-20 parts of a hyperbranched polyester curing agent, 0-5 parts of other curing agents, 0.05-0.3 part of a curing accelerator and 30-55 parts of an inorganic filler. After the hyperbranched polyester curing agent is added, the synthesized polyester curing agent is applied to an epoxy electronic packaging material, the flexibility is excellent, the crosslinking density and the strength are large, the electronic packaging material is free of halogen, the machinability, the physical properties and the electrical property of the electronic packaging material are optimized, and the flexibility applied to the electronic packaging material is excellent, so that the cold and thermal shock resistances of the electronic packaging material is largely improved.

Description

technical field

[0001] The invention belongs to the field of electronic packaging materials, in particular to a polyester curing agent with a hyperbranched structure and a synthesis method thereof. Background technique

[0002] Epoxy resin is one of the most widely used matrix resins in polymer-based composite materials. It is a product obtained by polycondensation reaction of compounds with epoxy groups and polyhydric hydroxyl or polyol compounds. It has excellent adhesion, resistance Chemical corrosion, electrical insulation properties, mechanical properties, and easy processing, low shrinkage, small linear expansion coefficient, and low cost are widely used in the packaging of electronic components such as varistors, ceramic capacitors, diodes, and triodes.

[0003] However, due to the lack of toughness of pure epoxy resin, the cured substance is easy to become brittle and cracks, so it cannot be used for the packaging of electronic components with high temperature cycle ...

Examples

Embodiment 1

[0034] A kind of flexible type epoxy resin composition with hyperbranched structure, its preparation method is as follows:

[0035] Premix epoxy resin, polyester curing agent A with hyperbranched structure, other curing agents, curing accelerators and inorganic fillers according to the ratio of parts by mass. The premixing time is 5-20min, and the speed is 500-1000r / min ; Then melt kneading extrusion (extrusion temperature 70 ~ 150 ℃, extruder speed 1500 ~ 3000r / min, feeding speed 900 ~ 2400r / min), then pulverized and sieved to obtain the epoxy resin composition. The amounts of the above-mentioned substances are shown in Table 1.

[0036] Wherein, a kind of synthetic method of the polyester curing agent A of hyperbranched structure, the steps are as follows:

[0037] ⑴In a 1L four-neck flask equipped with a heating mantle, agitator, thermometer, distillation column and condenser tube, add 230g of neopentyl glycol and 59g of trimethylolpropane, heat to about 120°C and stir to...

Embodiment 2

[0044] A kind of flexible type epoxy resin composition with hyperbranched structure, its preparation method is as follows:

[0045] Pre-mix epoxy resin, polyester curing agent B with hyperbranched structure, other curing agents, curing accelerators and inorganic fillers according to the ratio of parts by mass. The pre-mixing time is 5-20 minutes, and the speed is 500-1000r / min ; Then melt kneading extrusion (extrusion temperature 70 ~ 150 ℃, extruder speed 1500 ~ 3000r / min, feeding speed 900 ~ 2400r / min), then pulverized and sieved to obtain the epoxy resin composition. The amounts of the above-mentioned substances are shown in Table 1.

[0046] A kind of synthetic method of the polyester curing agent B of hyperbranched structure, the steps are as follows:

[0047] (1) Add 230g of neopentyl glycol and 56g of trimethylolpropane into a 1L four-neck flask equipped with a heating mantle, agitator, thermometer, distillation column and condenser, heat to about 120°C and stir to me...

technical field

[0001] The invention belongs to the field of electronic packaging materials, in particular to a polyester curing agent with a hyperbranched structure and a synthesis method thereof. Background technique

[0002] Epoxy resin is one of the most widely used matrix resins in polymer-based composite materials. It is a product obtained by polycondensation reaction of compounds with epoxy groups and polyhydric hydroxyl or polyol compounds. It has excellent adhesion, resistance Chemical corrosion, electrical insulation properties, mechanical properties, and easy processing, low shrinkage, small linear expansion coefficient, and low cost are widely used in the packaging of electronic components such as varistors, ceramic capacitors, diodes, and triodes.

[0003] However, due to the lack of toughness of pure epoxy resin, the cured substance is easy to become brittle and cracks, so it cannot be used for the packaging of electronic components with high temperature cycle ...

Examples

Embodiment 1

[0034] A kind of flexible type epoxy resin composition with hyperbranched structure, its preparation method is as follows:

[0035] Premix epoxy resin, polyester curing agent A with hyperbranched structure, other curing agents, curing accelerators and inorganic fillers according to the ratio of parts by mass. The premixing time is 5-20min, and the speed is 500-1000r / min ; Then melt kneading extrusion (extrusion temperature 70 ~ 150 ℃, extruder speed 1500 ~ 3000r / min, feeding speed 900 ~ 2400r / min), then pulverized and sieved to obtain the epoxy resin composition. The amounts of the above-mentioned substances are shown in Table 1.

[0036] Wherein, a kind of synthetic method of the polyester curing agent A of hyperbranched structure, the steps are as follows:

[0037] ⑴In a 1L four-neck flask equipped with a heating mantle, agitator, thermometer, distillation column and condenser tube, add 230g of neopentyl glycol and 59g of trimethylolpropane, heat to about 120°C and stir to...

Embodiment 2

[0044] A kind of flexible type epoxy resin composition with hyperbranched structure, its preparation method is as follows:

[0045] Pre-mix epoxy resin, polyester curing agent B with hyperbranched structure, other curing agents, curing accelerators and inorganic fillers according to the ratio of parts by mass. The pre-mixing time is 5-20 minutes, and the speed is 500-1000r / min ; Then melt kneading extrusion (extrusion temperature 70 ~ 150 ℃, extruder speed 1500 ~ 3000r / min, feeding speed 900 ~ 2400r / min), then pulverized and sieved to obtain the epoxy resin composition. The amounts of the above-mentioned substances are shown in Table 1.

[0046] A kind of synthetic method of the polyester curing agent B of hyperbranched structure, the steps are as follows:

[0047] (1) Add 230g of neopentyl glycol and 56g of trimethylolpropane into a 1L four-neck flask equipped with a heating mantle, agitator, thermometer, distillation column and condenser, heat to about 120°C and stir to me...

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