Low-density foaming BMC material and preparation method thereof

Abstract

The invention discloses a low-density foaming BMC material. The material comprises the following components in parts by weight: 60-70 parts of unsaturated resin, 1-2 parts of thermal expansion microspheres, 0.5-1 part of a foaming agent, 30-40 parts of a low-shrinkage additive, 0.7-1 part of a polymerization inhibitor, 1-2 parts of a wetting dispersant, 3-4.5 parts of color paste, 1-1.5 parts of athickening agent, 1-1.2 parts of a curing agent, 4-5 parts of a release agent, 100-120 parts of aluminum hydroxide, 50-80 parts of calcium bicarbonate and 20-60 parts of glass fibers. According to the invention, the density of the BMC product is effectively reduced, the material cost is greatly reduced, and the obtained BMC material has good mechanical properties and meets the expected low-density requirement.

Description

technical field

[0001] The invention belongs to the field of chemical composite materials, and in particular relates to BMC molding compounds, in particular to a low-density foamed BMC material and a preparation method thereof. Background technique

[0002] Bulk Molding Compound (BMC) is a thermosetting composite material mixed with saturated polyester resin, organic additives, curing agent, powder filler, thickener and chopped glass fiber. Its molding pressure and molding temperature are both low, which can reduce the investment cost of equipment and molds, and is suitable for processing large-scale components with complex configurations. Because of its excellent electrical properties, mechanical properties, heat resistance, and chemical corrosion resistance, it can meet the performance requirements of various products and has a wide range of applications.

[0003] At present, most BMC materials use hollow glass microspheres, carbon fibers and other lightweight fillers to ...

Examples

Embodiment 1

[0043] A low-density foamed BMC material, the raw material components by weight are as follows: 70 parts of unsaturated resin LY-S29802, 1 part of thermal expansion microspheres, 0.2 parts of AC foaming agent, 0.2 parts of OBSH foaming agent, 30 parts of low shrinkage additives , 0.85 parts of polymerization inhibitor, 1.2 parts of wetting and dispersing agent, 4.5 parts of color paste, 1.5 parts of thickener, 1.1 parts of curing agent, 4.5 parts of release agent, 100 parts of aluminum hydroxide, 50 parts of calcium bicarbonate, 60 parts 6mm non-alkali glass fiber.

[0044] The preparation steps of the above-mentioned low-density foamed BMC material are as follows:

[0045] (1) Add the heat-expandable microspheres and foaming agent into the mixing tank equipped with unsaturated resin according to the formula ratio, fully stir in the high-speed shear mixer, control the rotating speed at 1000rpm, and stir for 8 minutes;

[0046] (2) Add low-shrinkage additives, polymerization i...

Embodiment 2

[0054]A low-density foamed BMC material, the raw material components by weight are as follows: 65 parts of unsaturated resin LY-S29802, 1.5 parts of thermal expansion microspheres, 0.25 parts of AC foaming agent, 0.25 parts of OBSH foaming agent, 35 parts of low shrinkage additives , 0.7 parts of polymerization inhibitor, 1.5 parts of wetting and dispersing agent, 4 parts of color paste, 1.5 parts of thickener, 1 part of curing agent, 4 parts of release agent, 120 parts of aluminum hydroxide, 70 parts of calcium bicarbonate, 55 parts 6mm non-alkali glass fiber.

[0055] The preparation steps of the above-mentioned low-density foamed BMC material are as follows:

[0056] (1) Add the pre-treated heat-expandable microspheres and foaming agent according to the formula ratio into the mixing tank equipped with unsaturated resin, fully stir in the high-speed shear mixer, control the rotating speed at 1000rpm, and stir for 5 minutes;

[0057] (2) Add low-shrinkage additives, polymeri...

Embodiment 3

[0065] A low-density foamed BMC material, the raw material components by weight are as follows: 70 parts of unsaturated resin LY-S29802, 1.5 parts of thermal expansion microspheres, 0.35 parts of AC foaming agent, 0.35 parts of OBSH foaming agent, 30 parts of low shrinkage additives , 0.9 parts of polymerization inhibitor, 1 part of wetting and dispersing agent, 4.5 parts of color paste, 1 part of thickener, 1.1 parts of curing agent, 4.5 parts of release agent, 120 parts of aluminum hydroxide, 50 parts of calcium bicarbonate, 20 parts 6mm non-alkali glass fiber.

[0066] The preparation steps of the above-mentioned low-density foamed BMC material are as follows:

[0067] (1) Add the heat-expandable microspheres and foaming agent into the mixing tank equipped with unsaturated resin according to the formula ratio, fully stir in the high-speed shear mixer, control the rotating speed at 1000rpm, and stir for 8 minutes;

[0068] (2) Add low-shrinkage additives, polymerization inh...

technical field

[0001] The invention belongs to the field of chemical composite materials, and in particular relates to BMC molding compounds, in particular to a low-density foamed BMC material and a preparation method thereof. Background technique

[0002] Bulk Molding Compound (BMC) is a thermosetting composite material mixed with saturated polyester resin, organic additives, curing agent, powder filler, thickener and chopped glass fiber. Its molding pressure and molding temperature are both low, which can reduce the investment cost of equipment and molds, and is suitable for processing large-scale components with complex configurations. Because of its excellent electrical properties, mechanical properties, heat resistance, and chemical corrosion resistance, it can meet the performance requirements of various products and has a wide range of applications.

[0003] At present, most BMC materials use hollow glass microspheres, carbon fibers and other lightweight fillers to ...

Examples

Embodiment 1

[0043] A low-density foamed BMC material, the raw material components by weight are as follows: 70 parts of unsaturated resin LY-S29802, 1 part of thermal expansion microspheres, 0.2 parts of AC foaming agent, 0.2 parts of OBSH foaming agent, 30 parts of low shrinkage additives , 0.85 parts of polymerization inhibitor, 1.2 parts of wetting and dispersing agent, 4.5 parts of color paste, 1.5 parts of thickener, 1.1 parts of curing agent, 4.5 parts of release agent, 100 parts of aluminum hydroxide, 50 parts of calcium bicarbonate, 60 parts 6mm non-alkali glass fiber.

[0044] The preparation steps of the above-mentioned low-density foamed BMC material are as follows:

[0045] (1) Add the heat-expandable microspheres and foaming agent into the mixing tank equipped with unsaturated resin according to the formula ratio, fully stir in the high-speed shear mixer, control the rotating speed at 1000rpm, and stir for 8 minutes;

[0046] (2) Add low-shrinkage additives, polymerization i...

Embodiment 2

[0054]A low-density foamed BMC material, the raw material components by weight are as follows: 65 parts of unsaturated resin LY-S29802, 1.5 parts of thermal expansion microspheres, 0.25 parts of AC foaming agent, 0.25 parts of OBSH foaming agent, 35 parts of low shrinkage additives , 0.7 parts of polymerization inhibitor, 1.5 parts of wetting and dispersing agent, 4 parts of color paste, 1.5 parts of thickener, 1 part of curing agent, 4 parts of release agent, 120 parts of aluminum hydroxide, 70 parts of calcium bicarbonate, 55 parts 6mm non-alkali glass fiber.

[0055] The preparation steps of the above-mentioned low-density foamed BMC material are as follows:

[0056] (1) Add the pre-treated heat-expandable microspheres and foaming agent according to the formula ratio into the mixing tank equipped with unsaturated resin, fully stir in the high-speed shear mixer, control the rotating speed at 1000rpm, and stir for 5 minutes;

[0057] (2) Add low-shrinkage additives, polymeri...

Embodiment 3

[0065] A low-density foamed BMC material, the raw material components by weight are as follows: 70 parts of unsaturated resin LY-S29802, 1.5 parts of thermal expansion microspheres, 0.35 parts of AC foaming agent, 0.35 parts of OBSH foaming agent, 30 parts of low shrinkage additives , 0.9 parts of polymerization inhibitor, 1 part of wetting and dispersing agent, 4.5 parts of color paste, 1 part of thickener, 1.1 parts of curing agent, 4.5 parts of release agent, 120 parts of aluminum hydroxide, 50 parts of calcium bicarbonate, 20 parts 6mm non-alkali glass fiber.

[0066] The preparation steps of the above-mentioned low-density foamed BMC material are as follows:

[0067] (1) Add the heat-expandable microspheres and foaming agent into the mixing tank equipped with unsaturated resin according to the formula ratio, fully stir in the high-speed shear mixer, control the rotating speed at 1000rpm, and stir for 8 minutes;

[0068] (2) Add low-shrinkage additives, polymerization inh...