High-strength and high-temperature-resistant basalt fiber sheet molding compound as well as preparation method and application thereof

Abstract

The invention provides a high-strength and high-temperature-resistant basalt fiber sheet molding compound as well as a preparation method and application thereof, and belongs to the technical field of sheet molding compounds. The high-strength and high-temperature-resistant basalt fiber sheet molding compound provided by the invention is prepared from the following components: 34 to 35 percent of unsaturated polyester resin, 11 to 12 percent of low shrinkage agent, 5 to 6 percent of release agent, 0.1 to 0.5 percent of flame retardant, 0.5 to 1.0 percent of curing agent, 20 to 21 percent of aluminum hydroxide, 0.5 to 1.0 percent of thickening agent, 0.95 to 1 percent of filler, 24 to 26 percent of basalt fiber and 0.45 to 0.5 percent of polymerization inhibitor. According to the basalt fiber sheet molding compound provided by the invention, the composition of the sheet molding compound and the dosage of each component are controlled, the mechanical strength and high temperature resistance of a sheet molding compound molded product are improved, the basalt fiber sheet molding compound molded product provided by the invention is high in mechanical strength and high temperature resistance, and the time for the basalt fiber sheet molding compound molded product not to be burnt through at 1350 DEG C is more than 3 minutes.

Description

Technical Field

[0001] The invention belongs to the technical field of sheet molding compounds, and in particular relates to a high-strength and high-temperature-resistant basalt fiber sheet molding compound and a preparation method and application thereof. Background Art

[0002] Sheet molding compound (SMC sheet) is mainly made of special yarn, unsaturated resin, low shrinkage additives, fillers and various additives. It has the properties of light weight, high strength, corrosion resistance, weather resistance, etc., and is widely used in various fields. However, the high temperature resistance of SMC sheets prepared in the prior art is relatively general, all below 900°C, and the strength is low, which limits its application in high temperature fields.

[0003] Therefore, there is an urgent need for an SMC sheet with high strength and excellent high temperature resistance. Summary of the invention

[0004] The object of the present invention is to provide a high-strength and high-temperature resistant basalt fiber sheet molding compound and a preparation method and application thereof. The basalt fiber sheet molding compound provided by the present invention has high strength and excellent high-temperature resistance.

[0005] In order to achieve the above-mentioned object of the invention, the present invention provides the following technical solutions: The invention provides a high-strength and high-temperature resistant basalt fiber sheet molding compound, which comprises the following components by mass percentage: 34-35% of unsaturated polyester resin, 11-12% of low shrinkage agent, 5-6% of release agent, 0.1-0.5% of flame retardant, 0.5-1.0% of curing agent, 20-21% of aluminum hydroxide, 0.5-1.0% of thickener, 0.95-1% of filler, 24-26% of basalt fiber and 0.45-0.5% of polymerization inhibitor.

[0006] Preferably, the basalt fibers include basalt continuous fibers and basalt chopped fibers.

[0007] Preferably, the length of the basalt chopped fibers is 9-12 cm, and the diameter of a single fiber of the basalt chopped fibers is 9-11 μm.

[0008] Preferably, the release agent is zinc stearate.

[0009] Preferably, the curing agent is a high temperature curing agent tert-butyl benzoyl peroxide.

[0010] Preferably, the thickener is magnesium oxide.

[0011] Preferably, the filler is chrome corundum powder.

[0012] Preferably, the polymerization inhibitor is catechol.

[0013] The present invention also provides a method for preparing the high-strength and high-temperature-resistant basalt fiber sheet molding compound described in the above technical solution, comprising the following steps: (1) unsaturated polyester resin, low shrinkage agent, release agent, flame retardant, curing agent, aluminum hydroxide, thickener, filler and polymerization inhibitor are mixed to obtain resin paste; (2) coating the resin paste obtained in step (1) onto a lower carrier film to obtain a lower carrier film carrying the resin paste; (3) Covering the surface of the lower supporting film of the supporting resin paste obtained in step (2) with basalt fibers, the covering order is: part of the basalt continuous fibers are laid on the bottom layer, the basalt chopped fibers are laid on the middle layer, and the remaining basalt continuous fibers are laid on the upper layer, and then the remaining resin paste obtained in step (1) is coated, and then the upper supporting film is overlapped and rolled with multiple groups of rollers to obtain a high-strength and high-temperature resistant basalt fiber sheet molding compound.

[0014] The present invention also provides the application of the high-strength and high-temperature-resistant basalt fiber sheet molding compound described in the above technical solution or the high-strength and high-temperature-resistant basalt fiber sheet molding compound prepared according to the preparation method described in the above technical solution in the automotive field.

[0015] The present invention provides a high-strength and high-temperature resistant basalt fiber sheet molding compound, which comprises the following components by mass percentage: 34-35% unsaturated polyester resin, 11-12% low shrinkage agent, 5-6% release agent, 0.1-0.5% flame retardant, 0.5-1.0% curing agent, 20-21% aluminum hydroxide, 0.5-1.0% thickener, 0.95-1% filler, 24-26% basalt fiber and 0.45-0.5% polymerization inhibitor. The present invention controls the composition of the sheet molding compound and the amount of each component, thereby improving the mechanical strength and high-temperature resistance of the molded product of the sheet molding compound. The results of the embodiment show that the molded product of the basalt fiber sheet molding compound provided by the present invention has high mechanical strength and strong high-temperature resistance, and can withstand 1350°C without being burned for more than 3 minutes. DETAILED DESCRIPTION

[0016] The invention provides a high-strength and high-temperature resistant basalt fiber sheet molding compound, which comprises the following components by mass percentage: 34-35% of unsaturated polyester resin, 11-12% of low shrinkage agent, 5-6% of release agent, 0.1-0.5% of flame retardant, 0.5-1.0% of curing agent, 20-21% of aluminum hydroxide, 0.5-1.0% of thickener, 0.95-1% of filler, 24-26% of basalt fiber and 0.45-0.5% of polymerization inhibitor.

[0017] Unless otherwise specified, the present invention has no particular limitation on the sources of the components, and commercially available products known to those skilled in the art may be used.

[0018] By mass percentage, the high-strength and high-temperature resistant basalt fiber sheet molding compound provided by the present invention includes 34-35% of unsaturated polyester resin. In an embodiment of the present invention, the amount of the unsaturated polyester resin can be specifically 34.1%, 34.2%, 34.3%, 34.4%, 34.5%, 34.6%, 34.7%, 34.8%, 34.9% or 35%. In the present invention, the unsaturated polyester resin is used as a matrix material.

[0019] In the present invention, the unsaturated polyester resin is preferably JP-6707 produced by Foshan Jixin Plastic Chemical Industry Co., Ltd.

[0020] The high-strength and high-temperature resistant basalt fiber sheet molding compound provided by the present invention includes 11-12% of a low shrinkage agent by mass percentage. In an embodiment of the present invention, the amount of the low shrinkage agent may be specifically 11%, 11.1%, 11.2%, 11.3%, 11.4%, 11.5%, 11.6%, 11.7%, 11.8%, 11.9% or 12%. The present invention controls the amount of the low shrinkage agent within the above range, which can further improve the elongation and deformation of the molded product of the basalt fiber sheet molding compound.

[0021] In the present invention, the low shrinkage agent is preferably JP-6730 produced by Foshan Jixin Plastic Chemical Industry Co., Ltd.

[0022] The high-strength and high-temperature resistant basalt fiber sheet molding compound provided by the present invention includes 5-6% of a release agent by mass percentage. In an embodiment of the present invention, the amount of the release agent may be specifically 5%, 5.1%, 5.2%, 5.3%, 5.4%, 5.5%, 5.6%, 5.7%, 5.8%, 5.9% or 6%. The present invention controls the amount of the release agent within the above range, so that the basalt fiber sheet molding compound has a better demolding effect during the preparation process.

[0023] In the present invention, the release agent is preferably zinc stearate.

[0024] The high-strength and high-temperature resistant basalt fiber sheet molding compound provided by the present invention includes 0.1-0.5% of a flame retardant by mass percentage. In an embodiment of the present invention, the amount of the flame retardant may be specifically 0.1%, 0.2%, 0.3%, 0.4% or 0.5%. The present invention controls the amount of the flame retardant within the above range, which can further improve the high temperature resistance and flame retardant properties of the basalt fiber sheet molding compound.

[0025] In the present invention, the flame retardant is preferably a Huakai brand polyurethane flame retardant purchased from Foshan Jixin Plastic Chemical Industry Co., Ltd.

[0026] The high-strength and high-temperature-resistant basalt fiber sheet molding compound provided by the present invention includes 0.5-1.0% of a curing agent by mass percentage. In an embodiment of the present invention, the amount of the curing agent may be specifically 0.5%, 0.6%, 0.7%, 0.8%, 0.9% or 1.0%.

[0027] In the present invention, the curing agent is preferably a high temperature curing agent tert-butyl benzoyl peroxide (TBPB). The present invention controls the type and amount of the curing agent within the above range, which can further improve the curing effect of the basalt fiber sheet molding compound molded product, control its deformation amount and the accuracy of the product size.

[0028] By mass percentage, the high-strength and high-temperature resistant basalt fiber sheet molding compound provided by the present invention includes 20-21% aluminum hydroxide. In an embodiment of the present invention, the amount of aluminum hydroxide can be specifically 20%, 20.1%, 20.2%, 20.3%, 20.4%, 20.5%, 20.6%, 20.7%, 20.8%, 20.9% or 21%. In the present invention, the aluminum hydroxide plays a filling and flame retardant role. The present invention controls the amount of aluminum hydroxide within the above range, which can further improve the high temperature resistance, mechanical properties and flame retardant properties of the basalt fiber sheet molding compound.

[0029] The high-strength and high-temperature-resistant basalt fiber sheet molding compound provided by the present invention includes 0.5-1.0% thickener by mass percentage. In an embodiment of the present invention, the amount of the thickener can be specifically 0.5%, 0.6%, 0.7%, 0.8%, 0.9% or 1.0%.

[0030] In the present invention, the thickener is preferably magnesium oxide. The present invention controls the type and amount of the thickener within the above range, which can further improve the system viscosity of the basalt fiber sheet molding compound, so that the system maintains a uniform and stable suspension state or emulsion state, thereby improving the high temperature resistance and mechanical properties of the molded product.

[0031] The high-strength and high-temperature-resistant basalt fiber sheet molding compound provided by the present invention includes 0.95-1% filler by mass percentage. In an embodiment of the present invention, the amount of the filler can be specifically 0.95%, 0.96%, 0.97%, 0.98%, 0.99% or 1%.

[0032] In the present invention, the filler is preferably chrome corundum powder. In the present invention, the particle size of the chrome corundum powder is preferably 1-3 μm, more preferably 2 μm. In the present invention, the type, particle size and amount of the filler are controlled within the above range, which can further improve the high temperature resistance and flame retardancy of the basalt fiber sheet molding compound.

[0033] The high-strength and high-temperature-resistant basalt fiber sheet molding compound provided by the present invention comprises 24-26% basalt fiber by mass percentage. In an embodiment of the present invention, the amount of the basalt fiber can be specifically 24%, 24.5%, 25%, 25.5% or 26%.

[0034] In the present invention, the basalt fibers preferably include basalt continuous fibers and basalt chopped fibers.

[0035] In the present invention, the linear density of the basalt continuous fiber is preferably 2100-2300 TEX, more preferably 2200 TEX; the monofilament diameter of the basalt continuous fiber is preferably 9-11 μm, more preferably 10 μm.

[0036] In the present invention, the length of the basalt chopped fibers is preferably 9-12 cm; the linear density of the basalt chopped fibers is preferably 2100-2300 TEX, more preferably 2200 TEX; the monofilament diameter of the basalt chopped fibers is preferably 9-11 μm, more preferably 10 μm.

[0037] In the present invention, the mass ratio of the basalt continuous fibers to the basalt chopped fibers is preferably 1:(1-1.5), more preferably 1:1.25.

[0038] The present invention controls the fiber types and various parameters within the above ranges, which can further improve the high temperature resistance and mechanical properties of the basalt fiber sheet molding compound.

[0039] The high-strength and high-temperature-resistant basalt fiber sheet molding compound provided by the present invention includes 0.45-0.5% of polymerization inhibitor by mass percentage. In an embodiment of the present invention, the amount of the polymerization inhibitor can be specifically 0.45%, 0.46%, 0.47%, 0.48%, 0.49% or 0.5%.

[0040] In the present invention, the polymerization inhibitor is preferably catechol.

[0041] The invention controls the type and amount of the polymerization inhibitor within the above range, which can play a good polymerization inhibition role and improve storage stability.

[0042] In the present invention, the high-strength and high-temperature-resistant basalt fiber sheet molding compound preferably further includes color paste.

[0043] In the present invention, the color paste is preferably a water-based color paste. The present invention has no special restrictions on the color, amount and source of the color paste, which can be adjusted according to actual color requirements.

[0044] The invention controls the composition of the sheet molding compound and the dosage of each component, thereby improving the high temperature resistance of the sheet molding compound and having excellent mechanical properties.

[0045] The present invention also provides a method for preparing the high-strength and high-temperature-resistant basalt fiber sheet molding compound described in the above technical solution, comprising the following steps: (1) unsaturated polyester resin, low shrinkage agent, release agent, flame retardant, curing agent, aluminum hydroxide, thickener, filler and polymerization inhibitor are mixed to obtain resin paste; (2) coating the resin paste obtained in step (1) onto a lower carrier film to obtain a lower carrier film carrying the resin paste; (3) Covering the surface of the lower supporting film of the supporting resin paste obtained in step (2) with basalt fibers, the covering order is: part of the basalt continuous fibers are laid on the bottom layer, the basalt chopped fibers are laid on the middle layer, and the remaining basalt continuous fibers are laid on the upper layer, and then the remaining resin paste obtained in step (1) is coated, and then the upper supporting film is overlapped and rolled with multiple groups of rollers to obtain a high-strength and high-temperature resistant basalt fiber sheet molding compound.

[0046] The invention mixes unsaturated polyester resin, low shrinkage agent, release agent, flame retardant, curing agent, aluminum hydroxide, thickener, filler and polymerization inhibitor to obtain resin paste.

[0047] In the present invention, the unsaturated polyester resin, low shrinkage agent, release agent, flame retardant, curing agent, aluminum hydroxide, thickener, filler and polymerization inhibitor are preferably mixed as follows: unsaturated polyester resin and low shrinkage agent are mixed, curing agent is added, thickener and release agent are added at a rotation speed of 50-70 rpm, flame retardant, aluminum hydroxide, filler and polymerization inhibitor are added at a rotation speed of 10-30 rpm, and stirred for 15-20 minutes to allow each component to fully penetrate to obtain a resin paste.

[0048] After obtaining the resin paste, the present invention applies part of the resin paste onto the lower supporting film to obtain the lower supporting film supporting the resin paste.

[0049] In the present invention, part of the resin paste is preferably coated onto the lower supporting film at a flow rate set by a sheet machine to obtain the lower supporting film supporting the resin paste.

[0050] In the present invention, the flow rate set for the sheet machine is preferably 10 kg / min.

[0051] In the present invention, the mass of the part of the resin paste is preferably 50% of the total mass of the resin paste.

[0052] In the present invention, the lower support film is preferably a polyethylene film. The present invention has no special restrictions on the source and thickness of the polyethylene film, and a commercially available polyethylene film well known to those skilled in the art can be used.

[0053] The present invention has no special limitation on the coating method, as long as the resin paste is evenly coated.

[0054] After obtaining the lower supporting film for supporting the resin paste, the present invention covers the surface of the lower supporting film for supporting the resin paste with basalt fibers, and the covering order is: part of the basalt continuous fibers are laid on the bottom layer, the basalt chopped fibers are laid on the middle layer, the remaining basalt continuous fibers are continued to be laid on the upper layer, and then the remaining resin paste is coated, and then the upper supporting film is overlapped, and rolled by multiple groups of rollers to obtain a high-strength and high-temperature resistant basalt fiber sheet molding compound.

[0055] The present invention has no special limitation on the covering method, as long as the basalt fibers are evenly covered.

[0056] In the present invention, the mass of the portion of basalt continuous fibers is preferably 50% of the total mass of the basalt continuous fibers.

[0057] In the present invention, the upper supporting film is preferably a polyethylene film.

[0058] The present invention has no special limitation on the overlapping operation, and any overlapping method well known to those skilled in the art may be used.

[0059] The present invention has no special limitation on the operation of rolling, and a rolling technical solution well known to those skilled in the art can be used to ensure that the resin paste and the basalt fibers are tightly pressed together without bubbles after rolling.

[0060] The present invention also provides the application of the high-strength and high-temperature-resistant basalt fiber sheet molding compound described in the above technical solution or the high-strength and high-temperature-resistant basalt fiber sheet molding compound prepared according to the preparation method described in the above technical solution in the automotive field.

[0061] The present invention preferably cuts, peels off the film and molds the high-strength and high-temperature-resistant basalt fiber sheet molding compound in sequence to obtain a product of a desired shape.

[0062] In the present invention, the cut shape is preferably a square.

[0063] The present invention has no special limitation on the film peeling operation, and the film peeling technical solution well known to those skilled in the art can be adopted.

[0064] In the present invention, the molding is preferably performed by P40 steel mold molding. The present invention has no special restrictions on the size and shape of the P40 steel mold, which can be set according to the specific size of the product. In the present invention, the mold is preferably preheated before the molding, and then a release agent is applied inside. In the present invention, the preheating temperature is preferably the molding temperature. The present invention has no special restrictions on the type and application amount of the release agent, and the technical solutions familiar to those skilled in the art can be used.

[0065] In the present invention, the mass of the material added during molding is preferably 1.05 times the mass of the product. The present invention controls the mass of the material added during molding within the above range, which can avoid wasting the sheet material and enable the sheet material put into the mold cavity to fully fill the entire mold cavity, thereby ensuring the fluidity of the sheet material during the molding process, the compactness of the product and the surface quality of the product.

[0066] In the present invention, the molding temperature is preferably 145-150°C; the molding pressure is preferably 300-315 MPa / cm 2 The molding time is preferably 3 to 5 minutes, more preferably 4 minutes. The present invention controls the molding temperature, pressure and time within the above ranges, which can fully solidify the sheet material and further improve the various properties of the basalt fiber sheet molding compound product.

[0067] After the molding is completed, the molded product is preferably demolded and post-processed in sequence.

[0068] The present invention has no special limitation on the demoulding and post-processing operations, and the technical solutions well known to those skilled in the art can be adopted.

[0069] The high-strength and high-temperature-resistant basalt fiber sheet molding compound provided by the present invention is preferably used for the battery box of new energy electric vehicles.

[0070] The present invention has no special limitation on other operations of the application, and the technical solutions of the application well known to those skilled in the art may be adopted.

[0071] The technical solutions in the present invention will be described clearly and completely below in conjunction with the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0072] Example 1 A high-strength and high-temperature resistant basalt fiber sheet molding compound, which is composed of the following components by mass percentage: unsaturated polyester resin (Foshan Jixin Plastic Chemical Co., Ltd., JP-6707) 34.2%, low shrinkage agent (Foshan Jixin Plastic Chemical Co., Ltd., JP-6730) 11.6%, release agent (zinc stearate) 5.3%, flame retardant (Huakai brand polyurethane special flame retardant purchased from Foshan Jixin Plastic Chemical Co., Ltd.) 0.1%, curing agent (TBPB) 0.9%, aluminum hydroxide 20.6%, thickening agent Agent (magnesium oxide) 0.8%, filler (chrome corundum powder, particle size 2μm) 1%, basalt fiber 25% and inhibitor (catechol) 0.5%, wherein the basalt fiber is basalt continuous fiber and basalt short fiber, the mass ratio of basalt continuous fiber to basalt short fiber is 1:1.25, the linear density of basalt continuous fiber is 2200TEX, the single fiber diameter is 10μm, the length of basalt short fiber is 9-12cm, the linear density is 2200TEX, and the single fiber diameter is 10μm; The preparation method of the high-strength and high-temperature resistant basalt fiber sheet molding compound is as follows: (1) unsaturated polyester resin and low shrinkage agent are mixed, a curing agent is added, and then a thickener and a release agent are added at a speed of 60 rpm, and then a flame retardant, aluminum hydroxide, a filler and an inhibitor are added at a speed of 20 rpm and stirred for 20 minutes to obtain a resin paste; (2) coating the resin paste obtained in part of step (1) onto a lower supporting film (polyethylene film) at a flow rate of 10 kg / min set by the sheet machine to obtain a lower supporting film supporting the resin paste, wherein the mass of the part of the resin paste is 50% of the total mass of the resin paste; (3) Covering the surface of the lower supporting film of the supporting resin paste obtained in step (2) with basalt fibers, the covering order is: part of the basalt continuous fibers are laid on the bottom layer, the basalt chopped fibers are laid on the middle layer, the remaining basalt continuous fibers are continued to be laid on the upper layer, and then the remaining resin paste is coated, and then the upper supporting film (polyethylene film) is overlapped and rolled with multiple groups of rollers to obtain a high-strength and high-temperature resistant basalt fiber sheet molding compound, the mass of the part of the basalt continuous fibers is 50% of the total mass of the basalt continuous fibers.

[0073] Example 2 A high-strength and high-temperature resistant basalt fiber sheet molding compound, which is composed of the following components by mass percentage: unsaturated polyester resin (Foshan Jixin Plastic Chemical Co., Ltd., JP-6707) 34.5%, low shrinkage agent (Foshan Jixin Plastic Chemical Co., Ltd., JP-6730) 11.5%, release agent (zinc stearate) 5.3%, flame retardant (Huakai brand polyurethane special flame retardant purchased from Foshan Jixin Plastic Chemical Co., Ltd.) 0.2%, curing agent (TBPB) 0.9%, aluminum hydroxide 20.4%, thickening agent Agent (magnesium oxide) 0.7%, filler (chrome corundum powder, particle size 2μm) 1%, basalt fiber 25% and inhibitor (catechol) 0.5%, wherein the basalt fiber is basalt continuous fiber and basalt short fiber, the mass ratio of basalt continuous fiber to basalt short fiber is 1:1.25, the linear density of basalt continuous fiber is 2200TEX, the single fiber diameter is 10μm, the length of basalt short fiber is 9-12cm, the linear density is 2200TEX, and the single fiber diameter is 10μm; The preparation method of the high-strength and high-temperature resistant basalt fiber sheet molding compound is the same as that of Example 1.

[0074] Comparative Example 1 Basalt fiber sheet molding compound, calculated by mass percentage, is composed of the following components: unsaturated polyester resin (Foshan Jixin Plastic Chemical Industry Co., Ltd., JP-6707) 20.9%, low shrinkage agent (Foshan Jixin Plastic Chemical Industry Co., Ltd., JP-6730) 8.6%, release agent (zinc stearate) 3.8%, calcium powder 2.8%, curing agent (TBPB) 0.6%, aluminum hydroxide 23.8%, thickener (magnesium oxide) 0.5%, filler (chrome corundum powder, particle size 2μm) 10.5% and basalt fiber 28.5%, wherein the basalt fiber is basalt continuous fiber and basalt short fiber, the mass ratio of basalt continuous fiber to basalt short fiber is 1:1.25, the linear density of basalt continuous fiber is 2200TEX, the single fiber diameter is 10μm, the length of basalt short fiber is 9-12cm, the linear density is 2200TEX, and the single fiber diameter is 10μm; The preparation method of the basalt fiber sheet molding compound is the same as that of Example 1.

[0075] Comparative Example 2 The basalt fiber sheet molding compound is composed of the following components by mass percentage: unsaturated polyester resin (Foshan Jixin Plastic Chemical Industry Co., Ltd., JP-6707) 26%, low shrinkage agent (Foshan Jixin Plastic Chemical Industry Co., Ltd., JP-6730) 11.7%, release agent (zinc stearate) 3.8%, calcium powder 7.8%, curing agent (TBPB) 0.8%, aluminum hydroxide 31.2%, thickener (magnesium oxide) 0.5%, filler (chrome corundum powder, particle size 2μm) 13% and basalt fiber 5.2%, wherein the basalt fiber is basalt continuous fiber and basalt short fiber, the mass ratio of basalt continuous fiber to basalt short fiber is 1:1.25, the linear density of basalt continuous fiber is 2200TEX, the monofilament diameter is 10μm, the length of basalt short fiber is 9-12cm, the linear density is 2200TEX, and the monofilament diameter is 10μm; The preparation method of the basalt fiber sheet molding compound is the same as that of Example 1.

[0076] Comparative Example 3 The basalt fiber sheet molding compound is composed of the following components by mass percentage: 33.3% of unsaturated polyester resin (Foshan Jixin Plastic Chemical Industry Co., Ltd., JP-6707), 5% of low shrinkage agent (Foshan Jixin Plastic Chemical Industry Co., Ltd., JP-6730), 4.8% of release agent (zinc stearate), 0.7% of curing agent (TBPB), 42.9% of aluminum hydroxide, 0.7% of thickener (magnesium oxide) and 12.6% of basalt fiber, wherein the basalt fiber is basalt continuous fiber and basalt short fiber, the mass ratio of basalt continuous fiber to basalt short fiber is 1:1.25, the linear density of basalt continuous fiber is 2200TEX, the diameter of single fiber is 10μm, the length of basalt short fiber is 9-12cm, the linear density is 2200TEX, and the diameter of single fiber is 10μm; The preparation method of the basalt fiber sheet molding compound is the same as that of Example 1.

[0077] Comparative Example 4 The basalt fiber sheet molding compound is composed of the following components by mass percentage: unsaturated polyester resin (Foshan Jixin Plastic Chemical Industry Co., Ltd., JP-6707) 29.9%, low shrinkage agent (Foshan Jixin Plastic Chemical Industry Co., Ltd., JP-6730) 11.5%, release agent (zinc stearate) 4.3%, curing agent (TBPB) 0.7%, aluminum hydroxide 21%, insulation powder 11.9%, thickener (magnesium oxide) 0.6% and basalt fiber 20.1%, wherein the basalt fiber is basalt continuous fiber and basalt short fiber, the mass ratio of basalt continuous fiber to basalt short fiber is 1:1.25, the linear density of basalt continuous fiber is 2200TEX, the monofilament diameter is 10μm, the length of basalt short fiber is 9-12cm, the linear density is 2200TEX, and the monofilament diameter is 10μm; The preparation method of the basalt fiber sheet molding compound is the same as that of Example 1.

[0078] Comparative Example 5 The basalt fiber sheet molding compound is composed of the following components by mass percentage: 34.4% of unsaturated polyester resin (Foshan Jixin Plastic Chemical Industry Co., Ltd., JP-6707), 13.3% of low shrinkage agent (Foshan Jixin Plastic Chemical Industry Co., Ltd., JP-6730), 5% of release agent (zinc stearate), 0.9% of curing agent (TBPB), 20.7% of aluminum hydroxide, 0.7% of thickener (magnesium oxide) and 25% of basalt fiber, wherein the basalt fiber is basalt continuous fiber and basalt short fiber, the mass ratio of basalt continuous fiber to basalt short fiber is 1:1.5, the linear density of basalt continuous fiber is 2200TEX, the monofilament diameter is 10μm, the length of basalt short fiber is 9-12cm, the linear density is 2200TEX, and the monofilament diameter is 10μm; The preparation method of the basalt fiber sheet molding compound is the same as that of Example 1.

[0079] The weather resistance of the basalt fiber sheet molding compound in Example 1 was tested, wherein the ultraviolet environment was: wavelength 340nm, 60°C, power 0.89W / (m 2 ·mm), exposed for 8 hours; in saturated humidity and 50℃ environment, exposed for 4 hours, cycled for 1008h; salt spray environment: salt spray environment 35℃, sodium chloride solution concentration 50g / L, pH value 6.7, salt spray deposition 1.5mL / 80cm 2 ·h, 1000h; after testing, the strength retention rate of the basalt fiber sheet molding compound in Example 1 under ultraviolet environment is 92.5%; the strength retention rate under salt spray environment is 94.86%.

[0080] The basalt fiber sheet molding materials in Examples 1-2 and Comparative Examples 1-5 were cut into squares and then molded into column caps. The mass of the material added during molding was 1.05 times the mass of the product. The molding temperature was 145°C and the molding pressure was 310 MPa / cm 2 The molding time is 4 minutes, and the high temperature resistance of the column cap is shown in Table 1.

[0081] Table 1 High temperature resistance of column caps in Examples 1 to 2 and Comparative Examples 1 to 5

[0082] It can be seen from the data in Table 1 that the basalt fiber sheet molding compound provided by the present invention has excellent high temperature resistance and can withstand 1350° C. without being burned through for more than 3 minutes.

[0083] In the same way, the basalt fiber sheet molding compounds in Examples 1-2 and Comparative Examples 1-2 were molded, and standard samples were made according to the requirements of GB / T 1447-2005. The tensile properties of the molded products of the basalt fiber sheet molding compounds in Examples 1-2 and Comparative Examples 1-5 were tested according to the required test conditions and methods. The results are shown in Table 2.

[0084] Table 2 Tensile properties of basalt fiber sheet molding compound molded products in Examples 1-2 and Comparative Examples 1-5

[0085] In the same way, the basalt fiber sheet molding compounds in Examples 1-2 and Comparative Examples 1-5 were molded, and standard samples were made according to the requirements of GB / T 1447-2005. The bending resistance of the molded products of the basalt fiber sheet molding compounds in Examples 1-2 and Comparative Examples 1-5 was tested according to the test conditions and methods required therein. The results are shown in Table 3.

[0086] Table 3 Bending resistance of basalt fiber sheet molding compound molded products in Examples 1-2 and Comparative Examples 1-5

[0087] Application Examples The sheet in Example 1 was molded into a battery box cover using a DJ2106 battery case mold at a molding temperature of 145°C and a pressure of 315 MPa / cm 2 The time is 4 minutes, the material addition is 9.2 kg, the material size is 1500mm*1100mm*1100mm*600mm, and the battery box cover is completely filled, there is no scratch when ejected, and the surface quality is good.

[0088] Two battery box covers were randomly selected for airtightness test. The test standard was: inflation for 60 seconds, voltage stabilization for 60 seconds, and detection for 60 seconds. The results are shown in Table 4.

[0089] Table 4 Airtightness of the battery box cover molded from the sheet in Example 1

[0090] It can be seen from Table 4 that the battery box cover has excellent airtightness.

[0091] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A high-strength and high-temperature resistant basalt fiber sheet molding compound, characterized in that: Calculated by mass percentage, the composition includes: 34-35% unsaturated polyester resin, 11-12% low shrinkage agent, 5-6% release agent, 0.1-0.5% flame retardant, 0.5-1.0% curing agent, 20-21% aluminum hydroxide, 0.5-1.0% thickener, 0.95-1% filler, 24-26% basalt fiber and 0.45-0.5% polymerization inhibitor.

2. The high-strength and high-temperature-resistant basalt fiber sheet molding compound according to claim 1, characterized in that: The basalt fibers include basalt continuous fibers and basalt chopped fibers.

3. The high-strength and high-temperature-resistant basalt fiber sheet molding compound according to claim 2, characterized in that: The length of the basalt chopped fibers is 9-12 cm, and the diameter of the single fiber of the basalt chopped fibers is 9-11 μm.

4. The high-strength and high-temperature-resistant basalt fiber sheet molding compound according to claim 1, characterized in that: The release agent is zinc stearate.

5. The high-strength and high-temperature-resistant basalt fiber sheet molding compound according to claim 1, characterized in that: The curing agent is a high temperature curing agent tert-butyl benzoyl peroxide.

6. The high-strength and high-temperature-resistant basalt fiber sheet molding compound according to claim 1, characterized in that: The thickener is magnesium oxide.

7. The high-strength and high-temperature-resistant basalt fiber sheet molding compound according to claim 1, characterized in that: The filler is chrome corundum powder.

8. The high-strength and high-temperature-resistant basalt fiber sheet molding compound according to claim 1, characterized in that: The polymerization inhibitor is catechol.

9. The method for preparing the high-strength and high-temperature-resistant basalt fiber sheet molding compound according to any one of claims 1 to 8, comprising the following steps: (1) unsaturated polyester resin, low shrinkage agent, release agent, flame retardant, curing agent, aluminum hydroxide, thickener, filler and polymerization inhibitor are mixed to obtain resin paste; (2) coating the resin paste obtained in step (1) onto a lower carrier film to obtain a lower carrier film carrying the resin paste; (3) Covering the surface of the lower supporting film of the supporting resin paste obtained in step (2) with basalt fibers, the covering order is: part of the basalt continuous fibers are laid on the bottom layer, the basalt chopped fibers are laid on the middle layer, and the remaining basalt continuous fibers are laid on the upper layer, and then the remaining resin paste obtained in step (1) is coated, and then the upper supporting film is overlapped and rolled with multiple groups of rollers to obtain a high-strength and high-temperature resistant basalt fiber sheet molding compound.

10. Use of the high-strength and high-temperature-resistant basalt fiber sheet molding compound according to any one of claims 1 to 8 or the high-strength and high-temperature-resistant basalt fiber sheet molding compound prepared by the preparation method according to claim 9 in the automotive field.

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