BMC material composition, BMC material as well as preparation method and application of BMC material

Abstract

The invention provides a BMC material composition, a BMC material as well as a preparation method and application of the BMC material. The BMC material composition comprises unsaturated polyester, glass fibers, a filler and an optional auxiliary agent, wherein the molar ratio of a polymerization unit containing a carbon-carbon double bond to a polymerization unit not containing the carbon-carbon double bond of the unsaturated polyester is (3-1): 1; the viscosity of the unsaturated polyester at the temperature of 25 DEG C is 900 to 1500 cps; the filler is selected from at least one of calcium carbonate, talcum powder, montmorillonite, barium sulfate, silicon dioxide and titanium dioxide; relative to 100 parts by weight of the glass fiber, the use amount of the unsaturated polyester is 65-85 parts by weight, and the use amount of the filler is 120-180 parts by weight; the BMC material disclosed by the invention has the advantages of high strength, low water absorption rate and good insulativity.

Description

Technical Field

[0001] The present invention relates to the technical field of BMC materials, and particularly relates to a BMC material composition, a BMC material, a preparation method and an application thereof. Background Art

[0002] A terminal is a connecting device used to fix electrical devices on an air conditioner. The terminal fixes and connects the internal and external lines of the air conditioner by clamping wires with metals such as screws and gaskets, and plays a role in connecting the internal leads and the external power supply of the air conditioner. Since the terminal is in contact with electricity, its material must be an insulating, flame-retardant and temperature-resistant material, and certain strength and withstand voltage strength are also required to ensure the safety of the air conditioner power supply.

[0003] The commonly used terminal materials on air conditioners are mainly ceramics and PBT materials. However, the ceramic material terminal base is brittle, easy to break, and has a high cost; the dielectric properties of PBT materials are not good, and the electrical insulation performance is low. In addition, in a humid environment, moisture will penetrate into the PBT material, causing its structure to change, making its polar molecules flow, thereby forming a conductance channel inside it, resulting in a decrease in insulation resistance and causing electrical safety problems.

[0004] In view of the problems existing in the terminal, there is an urgent need for a terminal suitable for air conditioners with high insulation resistance, high strength and low water absorption. Summary of the Invention

[0005] In view of at least one of the problems of poor strength, high water absorption and poor insulation of the terminal in the prior art, the present invention provides a BMC material composition, a BMC material, a preparation method and an application thereof. The BMC material of the present invention has the advantages of high strength, low water absorption rate and good insulation.

[0006] The object of the present invention is mainly achieved through the following technical solutions.

[0007] In a first aspect, the present invention provides a BMC material composition, and the BMC material composition includes an unsaturated polyester, glass fiber, a filler and an optional additive.

[0008] Wherein, the molar ratio of the polymerization unit containing carbon-carbon double bonds to the polymerization unit not containing carbon-carbon double bonds of the unsaturated polyester is 3-1:1.

[0009] The viscosity of the unsaturated polyester at 25°C is 900-1500 cps.

[0010] The filler is selected from at least one of calcium carbonate, talcum powder, montmorillonite, barium sulfate, silicon dioxide and titanium dioxide.

[0011] The amount of the unsaturated polyester is 65 - 85 parts by weight, and the amount of the filler is 120 - 180 parts by weight relative to 100 parts by weight of the glass fiber.

[0012] Preferably, the amount of the unsaturated polyester is 70 - 80 parts by weight, and the amount of the first filler is 140 - 160 parts by weight relative to 100 parts by weight of the glass fiber.

[0013] And / or, the amount of the auxiliary agent is 140 - 190 parts by weight relative to 100 parts by weight of the glass fiber.

[0014] And / or, the molar ratio of the polymerized unit containing carbon - carbon double bonds to the polymerized unit not containing carbon - carbon double bonds in the unsaturated polyester is 2 - 1:1.

[0015] And / or, the viscosity of the unsaturated polyester is 1200 - 1500 cps.

[0016] The glass fiber includes a first glass fiber and a second glass fiber; the usage ratio of the first glass fiber to the second glass fiber is 1:0.5 - 1.5.

[0017] And / or, the length of the first glass fiber is 2 - 4 mm.

[0018] And / or, the diameter of the first glass fiber is 10 - 20 μm; the moisture content is 0.05 - 0.15%.

[0019] And / or, the length of the second glass fiber is 5 - 7 mm.

[0020] And / or, the diameter of the second glass fiber is 10 - 20 μm; the moisture content is 0.05 - 0.15%.

[0021] And / or, the glass fiber is an alkali - free glass fiber.

[0022] Preferably, the filler is selected from calcium carbonate and talcum powder.

[0023] Preferably, the weight ratio of the calcium carbonate to the talcum powder is 1:0.5 - 2.

[0024] Preferably, the particle size of the filler is 200 - 600 mesh.

[0025] Preferably, the auxiliary agent includes a flame retardant, a curing agent, a low - shrinkage agent, a thickening agent, a mold release agent, a cross - linking agent and a polymerization inhibitor.

[0026] Preferably, the usage ratio of the flame retardant, the curing agent, the low - shrinkage agent, the thickening agent, the mold release agent, the polymerization inhibitor and the cross - linking agent is 20 - 30:0.2 - 0.7:2 - 7:0.2 - 0.7:0.2 - 0.7:0.2 - 0.7:1.

[0027] Preferably, the flame retardant is selected from at least one of aluminum hydroxide, brominated polystyrene, decabromodiphenylethane, and antimony trioxide.

[0028] And / or, the curing agent is selected from tert-butyl peroxybenzoate and / or tert-butyl peroxyacetate.

[0029] And / or, the viscosity of the low shrinkage agent is 800 - 900 cps.

[0030] Preferably, the low shrinkage agent is resin ETERSET2015 and / or resin FX-3987.

[0031] And / or, the thickening agent is selected from magnesium oxide and / or calcium hydroxide.

[0032] And / or, the release agent is selected from at least one of zinc stearate, calcium stearate, and silicone masterbatch.

[0033] And / or, the crosslinking agent is styrene.

[0034] And / or, the polymerization inhibitor is selected from at least one of phenols, quinones, aromatic nitro compounds, organic nitrogen compounds, and inorganic compound polymerization inhibitors.

[0035] And / or, the BMC material composition further includes a pigment; the pigment is selected from at least one of carbon black, oil black, 2B blue, ultramarine blue, ultramarine violet, ST yellow, titanium yellow, iron red, or 179 red.

[0036] In a second aspect, the present invention provides a BMC material, which is obtained by compression molding or injection molding of the BMC material composition described in the first aspect.

[0037] In a third aspect, the present invention provides a preparation method of the BMC material described in the second aspect, the method including compression molding or injection molding of the BMC material composition described in the first aspect, preferably compression molding.

[0038] Preferably, the conditions for compression molding include: the compression molding temperature is 145 - 185 °C, and the curing time is 60 - 80 s.

[0039] And / or, the conditions for injection molding include: the injection molding temperature is 250 - 270 °C, and the curing time is 90 - 110 S.

[0040] And / or, the method further includes, before performing compression molding or injection molding, performing the following steps to prepare the BMC material composition:

[0041] Step (1): First mix the unsaturated polyester and the first part of additives to obtain a first mixture.

[0042] Step (2): The filler and the second part of additives are secondarily mixed, and then the first mixture is added and tertiarily mixed to obtain a second mixture.

[0043] Step (3): Glass fibers are added to the second mixture for quaternary mixing.

[0044] Preferably, the first part of additives includes a low shrinkage agent, a curing agent, a thickening agent, a crosslinking agent, a polymerization inhibitor, and a demolding agent;

[0045] And / or, the second part of additives is a flame retardant;

[0046] Preferably, the method further includes step (4): After the quaternary mixing in step (3), a pigment is added for quinary mixing.

[0047] Preferably, in step (1), the conditions for the first mixing include: the stirring speed is 800 - 1200 rpm, and the stirring time is 10 - 15 min.

[0048] And / or, in step (2), the conditions for the second mixing include: the stirring speed is 800 - 1200 rpm, and the stirring time is 3 - 8 min.

[0049] And / or, in step (2), the conditions for the tertiary mixing include: the stirring speed is 800 - 1200 rpm, and the stirring time is 10 - 15 min.

[0050] And / or, in step (3), the conditions for the quaternary mixing include: the stirring speed is 800 - 1200 rpm, and the stirring time is 3 - 8 min.

[0051] And / or, in step (4), the conditions for the quinary mixing include: the stirring speed is 800 - 1200 rpm, and the stirring time is 1 - 5 min.

[0052] Fourthly, the present invention provides an application of the preparation method of the BMC material composition described in the first aspect, the BMC material described in the second aspect, or the BMC material described in the third aspect in a terminal.

[0053] A BMC material composition, a BMC material, and a preparation method and application thereof according to the present invention have the following advantages:

[0054] The impact strength of the BMC material of the present invention (can reach 17.11 KJ / m 2 ) and the mechanical strength are high, and it has a high insulation resistance (> 9999 MΩ) and a low water absorption rate (can be as low as 0.266%). Specific Embodiments

[0055] The inventors of the present invention have found through research that a BMC material composition prepared by combining an unsaturated polyester having a specific viscosity index and containing a polymerized unit with a carbon-carbon double bond and a polymerized unit without a carbon-carbon double bond in a specific ratio, a specific filler, and glass fiber in a specific dosage ratio is used to prepare a BMC material with good strength, lower water absorption, and excellent insulation properties.

[0056] Based on the above research, in a first aspect, the present invention provides a BMC material composition, which includes an unsaturated polyester, glass fiber, a filler, and an optional additive;

[0057] Among them, the molar ratio of the polymerized unit containing a carbon-carbon double bond to the polymerized unit without a carbon-carbon double bond in the unsaturated polyester is 3-1:1 (which can be any value among 3:1, 2.5:1, 2:1, 1.5:1, and 1:1 or any value between any two of these values);

[0058] The viscosity of the unsaturated polyester at 25°C is 900-1500 cps (for example, it can be any value among 900 cps, 950 cps, 1000 cps, 1050 cps, 1100 cps, 1150 cps, 1200 cps, 1250 cps, 1300 cps, 1350 cps, 1400 cps, 1450 cps, and 1500 cps or any value between any two of these values);

[0059] The filler is selected from at least one of calcium carbonate, talcum powder, montmorillonite, barium sulfate, silica, and titanium dioxide;

[0060] Relative to 100 parts by weight of glass fiber, the dosage of the unsaturated polyester is 65-85 parts by weight (for example, it can be any value among 65 parts by weight, 67 parts by weight, 69 parts by weight, 71 parts by weight, 73 parts by weight, 75 parts by weight, 77 parts by weight, 79 parts by weight, 81 parts by weight, 83 parts by weight, and 85 parts by weight or any value between any two of these values), and the dosage of the filler is 120-180 parts by weight (for example, it can be any value among 120 parts by weight, 130 parts by weight, 140 parts by weight, 150 parts by weight, 160 parts by weight, 170 parts by weight, and 180 parts by weight or any value between any two of these values).

[0061] The viscosity of the unsaturated polyester of the present invention is the viscosity under the test condition of 25°C, which can be detected by commonly used methods in the art, such as testing with a commonly used rotational viscometer in the art.

[0062] In the present invention, the molar ratio of the polymerized units containing carbon-carbon double bonds to the polymerized units not containing carbon-carbon double bonds in the unsaturated polyester can be understood as the molar ratio of the anhydride or carboxylic acid polymerization monomers containing carbon-carbon double bonds to the anhydride or carboxylic acid polymerization monomers not containing carbon-carbon double bonds.

[0063] In a preferred embodiment of the present invention, relative to 100 parts by weight of glass fiber, the amount of the unsaturated polyester is 70 - 80 parts by weight, and the amount of the first filler is 140 - 160 parts by weight.

[0064] In a preferred embodiment of the present invention, relative to 100 parts by weight of glass fiber, the amount of the second filler is 140 - 190 parts by weight (for example, it can be any value among 140 parts by weight, 150 parts by weight, 160 parts by weight, 170 parts by weight, 180 parts by weight, and 190 parts by weight or any value between any two of these values), preferably 150 - 180 parts by weight.

[0065] In a preferred embodiment of the present invention, the molar ratio of the polymerized units containing carbon-carbon double bonds to the polymerized units not containing carbon-carbon double bonds in the unsaturated polyester is 2 - 1:1.

[0066] In a preferred embodiment of the present invention, the viscosity of the unsaturated polyester is 1200 - 1500 cps.

[0067] In a preferred embodiment of the present invention, the gel time of the unsaturated polyester is 5 - 20 min (for example, it can be any value among 5 min, 7 min, 9 min, 11 min, 13 min, 15 min, 17 min, 19 min, and 20 min or any value between any two of these values), preferably 6 - 8 min.

[0068] In a preferred embodiment of the present invention, the polymerization monomers of the unsaturated polyester include a dianhydride and a diol.

[0069] In a preferred embodiment of the present invention, the dianhydride includes a first dianhydride and a second dianhydride.

[0070] In a preferred embodiment of the present invention, the first dianhydride is selected from isophthalic anhydride or phthalic anhydride, preferably isophthalic anhydride. The second dianhydride is maleic anhydride. It is analyzed that the unsaturated polyester of the present invention is obtained by polymerizing the first dianhydride, the second dianhydride, and the diol, and the double bonds are all provided by the unsaturated dianhydride (the second dianhydride). Adding a saturated dibasic acid (the first dianhydride) to mix with the unsaturated dibasic acid can adjust the double bond content, reduce the crystallinity of the unsaturated polyester, and improve the compatibility with the crosslinking agent.

[0071] A preferred embodiment of the present invention is that the diol is selected from 1,2 - propanediol or 2,2 - dimethyl - 1,3 - propanediol, preferably 2,2 - dimethyl - 1,3 - propanediol.

[0072] A preferred embodiment of the present invention is that the glass fiber includes a first glass fiber and a second glass fiber; preferably, the dosage ratio of the first glass fiber to the second glass fiber is 1:0.5 - 1.5 (which can be any value among 1:0.5, 1:0.8, 1:1.1, 1:1.3, and 1:1.5 or any value between any two of these values), preferably 1:0.8 - 1.2. By adopting this preferred compounding ratio, the impact strength and mechanical strength of the BMC material can be further improved, and the water absorption rate of the BMC material is further reduced.

[0073] A preferred embodiment of the present invention is that the length of the first glass fiber is 1 - 6 mm (which can be any value among 1 mm, 2 mm, 3 mm, 4 mm, 5 mm, and 6 mm or any value between any two of these values); preferably 2 - 4 mm.

[0074] A preferred embodiment of the present invention is that the length of the second glass fiber is 4 - 10 mm (which can be any value among 4 mm, 5 mm, 6 mm, 7 mm, 8 mm, 9 mm, and 10 mm or any value between any two of these values); preferably 5 - 7 mm.

[0075] By compounding and using two glass fibers with the above - preferred lengths in the present invention, the impact strength and mechanical strength of the BMC material can be effectively improved.

[0076] A preferred embodiment of the present invention is that the diameter of the first glass fiber is 10 - 20 μm (which can be any value among 10 μm, 11 μm, 12 μm, 13 μm, 14 μm, 15 μm, 16 μm, 17 μm, 18 μm, 19 μm, and 20 μm or any value between any two of these values), preferably 11 - 15 μm; the moisture content is 0.05 - 0.15% (which can be any value among 0.05%, 0.1%, and 0.15% or any value between any two of these values), preferably 0.08 - 0.12%.

[0077] A preferred embodiment of the present invention is that the diameter of the second glass fiber is 10 - 20 μm, preferably 11 - 15 μm; the moisture content is 0.05 - 0.15% (which can be any value among 0.05%, 0.1%, and 0.15% or any value between any two of these values), preferably 0.08 - 0.12%. By using the glass fiber with the above - mentioned moisture content in combination with unsaturated polyester in the present invention, the BMC material has a lower water absorption rate.

[0078] A preferred embodiment of the present invention is that the glass fiber is an alkali-free glass fiber.

[0079] A preferred embodiment of the present invention is that the alkali metal oxide content of the alkali-free glass fiber is < 0.8 wt%.

[0080] A preferred embodiment of the present invention is that the filler is selected from at least two of calcium carbonate, talcum powder, montmorillonite, barium sulfate, silica and titanium dioxide, preferably calcium carbonate and talcum powder. Using the preferred filler in the present invention is beneficial to adjusting the melt fluidity, shrinkage and thermal conductivity of the BMC material. The larger the mesh number, the greater the oil absorption value of the resin, resulting in an increase in the viscosity of the material and making it difficult for the material to disperse and process.

[0081] A preferred embodiment of the present invention is that the weight ratio of calcium carbonate to talcum powder is 1:0.5 - 2 (which can be any value among 1:0.5, 1:0.8, 1:1.1, 1:1.3, 1:1.5, 1:1.8 and 1:2 or any value between any two of these values), preferably 1:0.8 - 1.2. Using the preferred dosage ratio in the present invention can effectively improve the impact strength of the BMC material and effectively reduce the water absorption rate of the BMC material.

[0082] A preferred embodiment of the present invention is that the particle size of the filler is 200 - 600 mesh (which can be any value among 200 mesh, 300 mesh, 400 mesh, 500 mesh and 600 mesh or any value between any two of these values), preferably 300 - 500 mesh. Using the preferred particle size can not only improve the impact strength, mechanical strength and insulation performance of the BMC material, but also make the BMC material have a lower water absorption rate; it is analyzed that using the filler with the preferred particle size can effectively improve the wettability between the glass fiber and the unsaturated polyester, and make the unsaturated polyester have a lower oil absorption value, and the formed BMC material has a lower viscosity, which is beneficial to the dispersion and processing of the BMC material.

[0083] A preferred embodiment of the present invention is that the additives include a flame retardant, a curing agent, a low shrinkage agent, a thickening agent, a release agent, a crosslinking agent and a polymerization inhibitor.

[0084] A preferred embodiment of the present invention is that the dosage ratio of the flame retardant, the curing agent, the low shrinkage agent, the thickening agent, the release agent, the polymerization inhibitor and the crosslinking agent is 20 - 30:0.2 - 0.7:2 - 7:0.2 - 0.7:0.2 - 0.7:0.2 - 0.7:1.

[0085] A preferred embodiment of the present invention is that the flame retardant is selected from at least one of aluminum hydroxide, brominated polystyrene, decabromodiphenylethane and antimony trioxide, preferably aluminum hydroxide.

[0086] A preferred embodiment of the present invention is that the curing agent is selected from tert-butyl peroxybenzoate and / or tert-butyl peroxyacetate, preferably tert-butyl peroxybenzoate.

[0087] A preferred embodiment of the present invention is that the viscosity of the low shrinkage agent is 800 - 900 cps.

[0088] A preferred embodiment of the present invention is that the low shrinkage agent is resin ETERSET2015 and / or resin FX - 3987, preferably resin ETERSET2015. Resin ETERSET2015 is purchased from Changxing Synthetic Resin (Changshu) Co., Ltd., with the brand name ETERSET2015; resin FX - 3987 is purchased from Nantong Fangxin Chemical Co., Ltd., with the brand name FX - 3987.

[0089] A preferred embodiment of the present invention is that the thickening agent is selected from magnesium oxide and / or calcium hydroxide, preferably magnesium oxide.

[0090] A preferred embodiment of the present invention is that the mold release agent is selected from at least one of zinc stearate, calcium stearate and silicone masterbatch, preferably zinc stearate.

[0091] A preferred embodiment of the present invention is that the crosslinking agent is styrene. Usually, the styrene crosslinking agent is used in the form of a solution. For example, styrene is dissolved in toluene to form a styrene solution, and the concentration of the styrene solution is 25 - 35 v%.

[0092] A preferred embodiment of the present invention is that the polymerization inhibitor is selected from at least one of phenols, quinones, aromatic nitro compounds, organic nitrogen compounds and inorganic compound polymerization inhibitors, preferably organic nitrogen compounds, and more preferably polymerization inhibitor 701.

[0093] A preferred embodiment of the present invention is that the BMC material composition further includes a pigment.

[0094] A preferred embodiment of the present invention is that, relative to 100 parts by weight of glass fiber, the dosage of the pigment is 1 - 10 parts by weight.

[0095] A preferred embodiment of the present invention is that the pigment is selected from at least one of carbon black, oil black, 2B blue, ultramarine blue, ultramarine violet, ST yellow, titanium yellow, iron red or 179 red.

[0096] In a second aspect, the present invention provides a BMC material, which is obtained by compression molding or injection molding of the BMC material composition described in the first aspect.

[0097] In a third aspect, the present invention provides a method for preparing a BMC material, which includes compression molding or injection molding of the BMC material composition described in the first aspect.

[0098] In a preferred embodiment of the present invention, the BMC material composition is compression molded.

[0099] In a preferred embodiment of the present invention, the conditions for compression molding include: a compression temperature of 145 - 185 °C and a curing time of 60 - 80 s.

[0100] In a preferred embodiment of the present invention, the conditions for injection molding include: an injection temperature of 250 - 270 °C and a curing time of 90 - 110 s.

[0101] In a preferred embodiment of the present invention, the method further includes, before compression molding or injection molding, performing the following steps to prepare the BMC material composition:

[0102] Step (1): First mix unsaturated polyester and the first part of additives to obtain a first mixture;

[0103] Step (2): Second mix the filler and the second part of additives, then add the first mixture and perform a third mix to obtain a second mixture;

[0104] Step (3): Add glass fiber to the second mixture and perform a fourth mix to obtain a third mixture.

[0105] In a preferred embodiment of the present invention, the first part of additives includes a low shrinkage agent, a curing agent, a thickening agent, a crosslinking agent, a polymerization inhibitor, and a demolding agent.

[0106] In a preferred embodiment of the present invention, the second part of additives is a flame retardant.

[0107] The present invention using the above - preferred preparation steps is more conducive to improving the uniformity of the BMC material composition and the dispersion of each component, and is more conducive to improving the mechanical strength and impact strength of the BMC material. It is analyzed that in step (1), it is beneficial for the unsaturated polyester and additives to form a uniform paste - like mixture; in step (2), there are more powder fillers. If the powder fillers are added at the beginning of step (1), they may be unevenly dispersed, and the crosslinking agent solution is likely to aggregate the powder into lumps, resulting in poor dispersion; adding glass fiber in step (3) can ensure the integrity of the glass fiber and exert the effect of enhancing the mechanical strength and impact strength of the BMC material by the glass fiber.

[0108] In a preferred embodiment of the present invention, the method further includes step (4): After performing the fourth mix in step (3), add a pigment and perform a fifth mix.

[0109] In a preferred embodiment of the present invention, in step (1), the conditions for the first mixing include: the stirring speed is 800 - 1200 rpm, and the stirring time is 10 - 15 min.

[0110] In a preferred embodiment of the present invention, in step (2), the conditions for the second mixing include: the stirring speed is 800 - 1200 rpm, and the stirring time is 3 - 8 min.

[0111] In a preferred embodiment of the present invention, in step (2), the conditions for the third mixing include: the stirring speed is 800 - 1200 rpm, and the stirring time is 10 - 15 min.

[0112] In a preferred embodiment of the present invention, in step (3), the conditions for the fourth mixing include: the stirring speed is 800 - 1200 rpm, and the stirring time is 3 - 8 min.

[0113] In a preferred embodiment of the present invention, in step (4), the conditions for the fifth mixing include: the stirring speed is 800 - 1200 rpm, and the stirring time is 1 - 5 min.

[0114] Fourthly, the present invention provides the application of the BMC material composition described in the first aspect, the BMC material described in the second aspect, or the preparation method of the BMC material described in the second aspect in a terminal block.

[0115] The following is to specifically describe the preferred embodiments of the present invention to illustrate the principle of the present invention, and it is not used to limit the scope of the present invention.

[0116] Unsaturated polyester 1: The polymerization monomers are phthalic anhydride, maleic anhydride, and neopentyl glycol (2,2 - dimethyl - 1,3 - propanediol); the molar ratio of phthalic anhydride to maleic anhydride is 1:1, and the viscosity at 25°C is 1200 - 1500 cps; the manufacturer is Changxing Synthetic Resin (Changshu) Co., Ltd., and the grade is Changxing Synthetic Resin ETERSET2725.

[0117] Unsaturated polyester 2: The polymerization monomers are phthalic anhydride, maleic anhydride, and 1,2 - propanediol; the molar ratio of phthalic anhydride to maleic anhydride is 1:1, and the viscosity is 900 - 1100 cps; the manufacturer is Changxing Synthetic Resin (Changshu) Co., Ltd., and the grade is Changxing Synthetic Resin ETERSET2837;

[0118] Unsaturated polyester 3: The polymerization monomers are phthalic anhydride, maleic anhydride, and neopentyl glycol; the molar ratio of phthalic anhydride to maleic anhydride is 3:1, and the viscosity is 900 - 1100 cps; the manufacturer is Changxing Synthetic Resin (Changshu) Co., Ltd., and the grade is Changxing Synthetic Resin ETERSET2736

[0119] E-glass fiber 1: diameter is 12μm, length is 3mm, moisture content is 0.08%, alkali metal oxide content < 0.8wt%;

[0120] E-glass fiber 2: diameter is 12μm, length is 6mm, moisture content is 0.08%, alkali metal oxide content < 0.8wt%;

[0121] E-glass fiber 3: diameter is 12μm, length is 12mm, moisture content is 0.08%, alkali metal oxide content < 0.8wt%;

[0122] Polymerization inhibitor 701: manufacturer is Nanjing Huikang Biotechnology Co., Ltd., brand is Polymerization inhibitor 701;

[0123] Carbon black: manufacturer is Jiangxi Black Cat Carbon Black Co., Ltd., brand is HM-300;

[0124] Low shrinkage agent: viscosity is 800 - 900cps, manufacturer is Changxing Synthetic Resin (Changshu) Co., Ltd., brand is Changxing Synthetic Resin ETERSET2015.

[0125] Examples 1 - 14

[0126] Step (1): Unsaturated polyester, low shrinkage agent, curing agent, thickening agent, crosslinking agent, polymerization inhibitor and mold release agent are respectively put into a disperser according to the component dosages in Table 1 and Table 2 for the first mixing (rotation speed 1000rpm, time 13min) to obtain the first mixture;

[0127] Step (2): The flame retardant, calcium carbonate and talcum powder are put into a kneader according to the component dosages in Table 1 and Table 2 for the second mixing (stirring speed 1000rpm, stirring time 5min) to obtain the second mixture, and then the first mixture obtained by mixing in step (1) is put into the kneader to be mixed with the second mixture for the third mixing (rotation speed 1000rpm, time 13min) to obtain the third mixture;

[0128] Step (3): The first glass fiber and the second glass fiber are added into the third mixture according to the component dosages in Table 1 and Table 2 for the fourth mixing (stirring speed 1000rpm, stirring time 5min) to obtain the fourth mixture;

[0129] Step (4): The pigment is added into the fourth mixture according to the component dosages in Table 1 and Table 2 for the fifth mixing (stirring speed 1000rpm, stirring time 3min) to obtain the BMC material composition;

[0130] Step (5): Divide the BMC material composition obtained in step (4) into lumps and put them into a molding press for molding the parts. The molding temperature is 145 - 185 °C, and the curing time is 70 s to obtain BMC material plastic parts A1 - A14 and corresponding test specimens respectively.

[0131] Example 15

[0132] Prepare the BMC material according to the method of Example 2, except that it is carried out according to the following steps:

[0133] Step (1): Unsaturated polyester, low shrinkage agent, curing agent, thickening agent, crosslinking agent, inhibitor, mold release agent, flame retardant, calcium carbonate and talcum powder are respectively put into a disperser according to the component dosages in Table 1 and Table 2 for the first mixing (rotation speed 1000 rpm, time 13 min) to obtain the first mixture;

[0134] Step (2): Add the first glass fiber and the second glass fiber into the first mixture according to the component dosages in Table 1 and Table 2 for the second mixing (stirring speed 1000 rpm, stirring time 5 min) to obtain the second mixture;

[0135] Step (3): Add the pigment into the second mixture according to the component dosages in Table 1 and Table 2 for the third mixing (stirring speed 1000 rpm, stirring time 3 min) to obtain the BMC material composition;

[0136] Step (4): Divide the BMC material composition obtained in step (3) into lumps and put them into a molding press for molding the parts. The molding temperature is 145 - 185 °C, and the curing time is 70 s to obtain the BMC material plastic part A15 and the corresponding specimen.

[0137] Example 16

[0138] Prepare the BMC material according to the method of Example 2, except that step (3) is carried out first, and then step (2); obtain the BMC material plastic part A16 and the corresponding test specimens.

[0139] Comparative Examples 1 - 4

[0140] Prepare the BMC material according to the method of Example 2, except that it is prepared according to the component dosages in Table 2; obtain the BMC materials B1 - B4 and the corresponding test specimens respectively.

[0141] Table 1

[0142]

[0143]

[0144] Table 2

[0145]

[0146]

[0147] Test Example

[0148] The notched Izod impact strength of the BMC material test specimens prepared in Examples 1-16 and Comparative Examples 1-4 was detected, and the mechanical strength, insulation resistance before and after water absorption, and water absorption rate of the plastic parts were detected. Before the test, the test specimens and plastic parts were placed in an environment of (23±2)°C and humidity (50±10)% for 88 h. The test results are shown in Table 3:

[0149] (1) Notched Izod impact strength: Detected according to ISO180-00 standard;

[0150] (2) Mechanical strength: Detected according to GB / T 2423.8-1995 standard;

[0151] (3) Insulation resistance before and after water absorption: Detected according to GB / T 10064 standard;

[0152] (4) Water absorption rate: Detected according to GB / T 1034-2008 standard.

[0153] Table 3

[0154]

[0155]

[0156] As can be seen from the above examples and comparative examples, the BMC materials prepared in Examples 1-3 using the preferred technical solutions of the present invention have higher impact strength (reaching 16.89 KJ / m 2 or more) and mechanical strength, and have lower water absorption rate (reaching below 0.305%) and higher insulation resistance (>9999 MΩ);

[0157] Compared with Example 4 using only calcium carbonate and Example 5 using only talc, the BMC material prepared in Example 2 using a compound of calcium carbonate and talc as the first filler has higher impact strength (which can reach 17.1 KJ / m 2 ); and lower water absorption rate (which can reach 0.266%);

[0158] Compared with Example 6 with a calcium carbonate to talc ratio of 1:2 and Example 7 with a calcium carbonate to talc ratio of 1:0.5, the BMC material prepared in Example 2 using a compound of calcium carbonate and talc in a ratio of 1:1 as the first filler has higher impact strength (which can reach 17.1 KJ / m2 ) and lower water absorption rate (up to 0.266%);

[0159] Compared with Example 8 using unsaturated polyester 2 (viscosity 900 - 1100 cps) synthesized from phthalic anhydride, maleic anhydride, and 1,2 - propanediol, the BMC material prepared in Example 2 using unsaturated polyester 1 (viscosity 1200 - 1500 cps) synthesized from isophthalic anhydride, maleic anhydride, and neopentyl glycol has higher impact strength (up to 17.1 KJ / m 2 ) and insulation resistance (>9999 MΩ), and lower water absorption rate (up to 0.266%);

[0160] Compared with Example 9 using unsaturated polyester 3 (viscosity 900 - 1100 cps) synthesized from isophthalic anhydride, maleic anhydride, and neopentyl glycol, the BMC material prepared in Example 2 using unsaturated polyester 1 (viscosity 1200 - 1500 cps) synthesized from isophthalic anhydride, maleic anhydride, and neopentyl glycol has higher impact strength (up to 17.1 KJ / m 2 ) and lower water absorption rate (up to 0.266%);

[0161] Compared with Example 10 using a combination of alkali - free glass fibers with a length of 3 mm and alkali - free glass fibers with a length of 12 mm and Example 11 using a combination of alkali - free glass fibers with a length of 6 mm and alkali - free glass fibers with a length of 12 mm, the BMC material prepared in Example 2 using a combination of alkali - free glass fibers with lengths of 3 mm and 6 mm has higher impact strength (up to 17.1 KJ / m 2 ) and mechanical strength, as well as lower water absorption rate (up to 0.266%);

[0162] Compared with Example 12 using a combination of 800 - mesh calcium carbonate and 800 - mesh talc, Example 13 using a combination of 400 - mesh calcium carbonate and 800 - mesh talc, and Example 14 using a combination of 800 - mesh calcium carbonate and 400 - mesh talc, the BMC material prepared in Example 2 using a combination of 400 - mesh calcium carbonate and 400 - mesh talc has higher impact strength (up to 17.1 KJ / m 2 )、mechanical strength and insulation resistance (>9999 MΩ), and lower water absorption rate (up to 0.266%);

[0163] Compared with Example 15 where unsaturated polyester is mixed with the first filler and the second filler together, in Example 2, the unsaturated polyester is first mixed with a part of the second filler to obtain a first mixture, and then the other part of the second filler is mixed with the first filler and then mixed with the first mixture. The prepared BMC material has higher impact strength (up to 17.1 KJ / m2 ) Higher mechanical strength (no breakage) and insulation resistance (>9999 MΩ), and lower water absorption rate (can reach 0.266%);

[0164] Compared with Example 16 in which the first mixture is first mixed with glass fiber and then mixed with another part of the second filler and the first filler, the BMC material prepared in Example 2 by first mixing the first mixture with another part of the second filler and the first filler and then mixing with glass fiber has higher impact strength (can reach 17.1 KJ / m 2 ) and mechanical strength (no breakage), and lower water absorption rate (can reach 0.266%);

[0165] Compared with Comparative Examples 1 and 2 that only use one kind of alkali-free glass fiber, the BMC material prepared in Example 2 by compounding two kinds of alkali-free glass fibers has higher impact strength (can reach 17.1 KJ / m 2 ) and lower water absorption rate (can reach 0.266%);

[0166] Compared with Comparative Example 3 in which the ratio of glass fiber to unsaturated polyester is 100:100, the ratio of glass fiber to unsaturated polyester in Example 2 is 100:75, and the impact strength of the prepared BMC material can reach 17.1 KJ / m 2 (1.6 times that of Comparative Example 2), higher mechanical strength without breakage, and lower water absorption rate can reach 0.266%;

[0167] Compared with Comparative Example 4 in which the ratio of glass fiber to unsaturated polyester and the first filler is approximately 100:94:188, the ratio of glass fiber to unsaturated polyester in Example 2 is 100:75:150, and the impact strength of the prepared BMC material can reach 17.1 KJ / m 2 (1.3 times that of Comparative Example 2), and lower water absorption rate can reach 0.266%.

[0168] For any numerical value mentioned in the present invention, if there is only a two-unit interval between any lowest value and any highest value, it includes all values increasing by one unit each time from the lowest value to the highest value. For example, if the amount of a component or the value of a process variable such as temperature, pressure, time, etc. is stated as 50 - 90, it means in this specification that 51 - 89, 52 - 88... as well as 69 - 71 and 70 - 71, etc. are specifically listed. For non-integer values, it is appropriate to consider 0.1, 0.01, 0.001, or 0.0001 as one unit. These are only some specifically indicated examples. In this application, in a similar manner, all possible combinations of numerical values between the listed lowest value and highest value are considered to have been disclosed.

[0169] It should be noted that the above-described embodiments are only used to explain the present invention and do not constitute any limitation to the present invention. The present invention has been described by referring to exemplary embodiments, but it should be understood that the words used therein are descriptive and explanatory words rather than limiting words. Modifications can be made to the present invention within the scope of the claims of the present invention as provided, and revisions can be made to the present invention without departing from the scope and spirit of the present invention. Although the present invention described therein relates to specific methods, materials and embodiments, it does not mean that the present invention is limited to the specific examples disclosed therein. On the contrary, the present invention can be extended to all other methods and applications having the same function.

Claims

1. A BMC material composition, characterized in that, The described BMC material composition includes unsaturated polyester, glass fiber, filler, and optionally additives; Among them, the molar ratio of the polymerized units containing carbon-carbon double bonds to the polymerized units not containing carbon-carbon double bonds in the unsaturated polyester is 3 - 1:1; The viscosity of the unsaturated polyester at 25 °C is 900 - 1500 cps; The filler is selected from at least one of calcium carbonate, talcum powder, montmorillonite, barium sulfate, silica, and titanium dioxide; Relative to 100 parts by weight of glass fiber, the amount of the unsaturated polyester used is 65 - 85 parts by weight, and the amount of the filler used is 120 - 180 parts by weight.

2. The BMC material composition according to claim 1, characterized in that, Relative to 100 parts by weight of glass fiber, the amount of the unsaturated polyester used is 70 - 80 parts by weight, and the amount of the filler used is 140 - 160 parts by weight; And / or, relative to 100 parts by weight of glass fiber, the amount of the additive used is 140 - 190 parts by weight; And / or, the molar ratio of the polymerized units containing carbon-carbon double bonds to the polymerized units not containing carbon-carbon double bonds in the unsaturated polyester is 2 - 1:1; And / or, the viscosity of the unsaturated polyester is 1200 - 1500 cps.

3. The BMC material composition according to claim 1 or 2, characterized in that The glass fiber includes first glass fiber and second glass fiber; The usage ratio of the first glass fiber to the second glass fiber is 1:0.5 - 1.5; And / or, the length of the first glass fiber is 2 - 4 mm; And / or, the diameter of the first glass fiber is 10 - 20 μm; the moisture content is 0.05 - 0.15%; And / or, the length of the second glass fiber is 5 - 7 mm; And / or, the diameter of the second glass fiber is 10 - 20 μm; the moisture content is 0.05 - 0.15%; And / or, the glass fiber is alkali-free glass fiber.

4. The BMC material composition according to claim 1 or 2, characterized in that, The filler is selected from calcium carbonate and talcum powder; the weight ratio of calcium carbonate to talcum powder is 1:0.5 - 2; And / or, the particle size of the filler is 200 - 600 mesh.

5. The BMC material composition according to claim 1 or 2, characterized in that The additive includes flame retardant, curing agent, low shrinkage agent, thickening agent, mold release agent, crosslinking agent, and polymerization inhibitor; The usage ratio of the flame retardant, curing agent, low shrinkage agent, thickening agent, mold release agent, polymerization inhibitor, and crosslinking agent is 20 - 30:0.2 - 0.7:2 - 7:0.2 - 0.7:0.2 - 0.7:0.2 - 0.7:

1.

6. The BMC material composition according to claim 5, wherein The flame retardant is selected from at least one of aluminum hydroxide, brominated polystyrene, decabromodiphenylethane, and antimony trioxide; And / or, the curing agent is selected from tert-butyl peroxybenzoate and / or tert-butyl peroxyacetate; And / or, the viscosity of the low shrinkage agent is 800 - 900 cps; And / or, the low shrinkage agent is at least one of resin ETERSET2015 and / or resin FX-3987; And / or, the thickening agent is selected from magnesium oxide and / or calcium hydroxide; And / or, the mold release agent is selected from at least one of zinc stearate, calcium stearate, and silicone masterbatch; And / or, the crosslinking agent is styrene; And / or, the polymerization inhibitor is selected from at least one of phenols, quinones, aromatic nitro compounds, organic nitrogen compounds, and inorganic compound polymerization inhibitors; And / or, the BMC material composition further comprises a pigment; the pigment is selected from at least one of carbon black, oil black, 2B blue, ultramarine blue, ultramarine violet, ST yellow, titanium yellow, iron red or 179 red.

7. A BMC material, characterized in that, The BMC material is obtained by compression molding or injection molding of the BMC material composition according to any one of claims 1-6.

8. The preparation method of the BMC material according to claim 7, characterized in that, The method comprises compression molding or injection molding of the BMC material composition according to any one of claims 1-6; And / or, the conditions of the compression molding include: the compression molding temperature is 145-185 °C, and the curing time is 60-80 s; And / or, the conditions of the injection molding include: the injection molding temperature is 250-270 °C, and the curing time is 90-110 s; And / or, the method further comprises the following steps for preparing the BMC material composition before compression molding or injection molding: Step (1): First mix the unsaturated polyester and the first part of the additives to obtain a first mixture; Step (2): Second mix the filler and the second part of the additives, and then add the first mixture and perform a third mix to obtain a third mixture; Step (3): Add the glass fiber into the third mixture and perform a fourth mix; And / or, the first part of the additives includes a low shrinkage agent, a curing agent, a thickening agent, a crosslinking agent, a polymerization inhibitor and a demolding agent; And / or, the second part of the additives is a flame retardant; And / or, the method further comprises Step (4): After performing the fourth mix in Step (3), add the pigment and perform a fifth mix.

9. The method according to claim 8, wherein In Step (1), the conditions of the first mix include: the stirring speed is 800-1200 rpm, and the stirring time is 10-15 min; And / or, in Step (2), the conditions of the second mix include: the stirring speed is 800-1200 rpm, and the stirring time is 3-8 min; And / or, in Step (2), the conditions of the third mix include: the stirring speed is 800-1200 rpm, and the stirring time is 10-15 min; And / or, in Step (3), the conditions of the fourth mix include: the stirring speed is 800-1200 rpm, and the stirring time is 3-8 min; And / or, in Step (4), the conditions of the fifth mix include: the stirring speed is 800-1200 rpm, and the stirring time is 1-5 min.

10. Application of the BMC material composition according to any one of claims 1-6, the BMC material according to claim 7, or the method for preparing the BMC material according to claim 8 or 9 in a terminal.

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