Sheet molding compound resin composite material and preparation method thereof

Abstract

The invention provides a sheet molding compound resin composite material and a preparation method thereof. The resin composite material comprises the following components in parts by weight: 60-70 parts of unsaturated resin; 30-40 parts by weight of a low shrinkage agent; 0.5-1.5 parts by weight of a curing agent; 0.3-1 part by weight of a polymerization inhibitor; 0.2-1 part by weight of a wetting dispersant; 2-6 parts by weight of an internal release agent; 140-180 parts by weight of an inorganic composite filler; 15-35 parts by weight of zeolite powder; 120 to 150 parts by weight of glass fiber; 2-6 parts by weight of a thickening agent; and 1-2 parts by weight of a deodorant. Through the synergistic effect of the zeolite powder and the deodorant, the peculiar smell of the SMC resin composite material is further reduced, and meanwhile the basic mechanical property of the composite material is kept. According to the preparation method, by regulating and controlling the curing temperature and the curing time, the curing rate of the sheet molding compound resin composite material is increased, and the generation of residual peculiar smell substances which are not completely reacted is reduced.

Description

Technical Field

[0001] The present invention relates to the field of sheet molding compound resin composite materials, in particular to a sheet molding compound resin composite material and a preparation method thereof. Background Art

[0002] SMC (Sheet Molding Compound) is a composite material with excellent mechanical properties, high weather resistance, good dimensional stability, excellent corrosion resistance, and lightweight properties. It is widely used in the automotive industry, such as roofs, doors, spoilers, battery housings, and other automotive interior and exterior components. As consumers' attention to environmental protection and health continues to increase, the design and selection of automotive interior components are increasingly inclined to use low-odor and low-emission materials, providing consumers with a more comfortable, healthy, and odor-free driving environment.

[0003] Existing SMC resin composites typically include unsaturated resins and low-shrinkage agents, which often contain styrene as a crosslinker. When the resin is not fully cured, the residual styrene can volatilize and produce a distinctive odor. The processing of SMC resin composites typically involves high-temperature compression molding, which can cause degradation of the resin and additives, producing irritating odors such as aldehydes. These odors not only cause unpleasant olfactory sensations but can also have adverse health effects. This limits the application of SMC resin composites in the automotive industry and prevents them from meeting the low-odor requirements for automotive interior components.

[0004] In order to meet the requirements of a healthy and odor-free vehicle interior environment, the present invention aims to find an SMC resin composite material that is more environmentally friendly and has good mechanical properties. Summary of the Invention

[0005] The purpose of the embodiments of the present invention is to provide a sheet molding compound resin composite material and a preparation method thereof. The composite material has the characteristics of low odor and low emission, while also having good mechanical properties, and can be used for automotive interior parts such as movable roofs and car doors that have high odor requirements.

[0006] In order to achieve the above-mentioned object, an embodiment of the present invention provides a sheet molding compound resin composite material, wherein the resin composite material comprises the following components:

[0007] 60-70 parts by weight of unsaturated resin;

[0008] 30-40 parts by weight of a low shrinkage agent;

[0009] 0.5-1.5 parts by weight of a curing agent;

[0010] 0.3-1 parts by weight of polymerization inhibitor;

[0011] 0.2-1 parts by weight of a wetting and dispersing agent;

[0012] 2-6 parts by weight of internal release agent;

[0013] 140-180 parts by weight of inorganic composite filler;

[0014] 15-35 parts by weight of zeolite powder;

[0015] 120-150 parts by weight of glass fiber;

[0016] 2-6 parts by weight of a thickener;

[0017] 1-2 parts by weight of deodorant.

[0018] Optionally, the unsaturated resin includes any one or a combination of at least two of maleic anhydride unsaturated polyester resin, epoxy vinyl ester unsaturated resin, orthophthalic unsaturated polyester resin or isophthalic unsaturated polyester resin.

[0019] Preferably, the unsaturated resin is epoxy vinyl ester unsaturated resin or maleic anhydride unsaturated polyester resin; the unsaturated resin is 65-70 parts by weight.

[0020] Optionally, the low shrinkage agent includes any one of polyvinyl acetate, polyvinyl acetate, polystyrene, saturated polyester resin or polymethyl methacrylate, or a combination of at least two thereof.

[0021] Preferably, the low shrinkage agent is polystyrene or polyvinyl acetate; the low shrinkage agent is 35-40 parts by weight.

[0022] Optionally, the curing agent includes any one of tert-butyl perbenzoate or tert-butyl peroxycarbonate-2-ethylhexyl ester, or a combination of both.

[0023] Preferably, the curing agent is tert-butyl peroxycarbonate-2-ethylhexyl ester or tert-butyl peroxybenzoate; the curing agent is 1-1.5 parts by weight.

[0024] Optionally, the polymerization inhibitor includes any one or a combination of at least two of hydroquinone, p-benzoquinone or methylhydroquinone; the wetting and dispersing agent includes BYK-W9010 or BYK-W972; and the internal release agent includes zinc stearate or calcium stearate.

[0025] Preferably, the polymerization inhibitor is hydroquinone or p-benzoquinone, the wetting and dispersing agent is BYK-W9010, and the internal release agent is zinc stearate; the polymerization inhibitor is 0.4-1 parts by weight; the wetting and dispersing agent is 0.8-1 parts by weight; and the internal release agent is 4.6-6 parts by weight.

[0026] Optionally, the inorganic composite filler comprises glass microspheres and calcium carbonate in a mass ratio of (0.5-1.0):(3.0-5.0).

[0027] Preferably, the inorganic composite filler is 140-145 parts by weight; and the mass ratio of glass microspheres to calcium carbonate is (0.5-0.75):(4.5-5.0).

[0028] Optionally, the thickener includes any one of MgO, CaO or Mg(OH)2 or a combination of at least two of them.

[0029] Preferably, the thickener is MgO, and the thickener is 4-6 parts by weight.

[0030] Preferably, the deodorant is poly-β-glucosamine; the deodorant is 1.2-2 parts by weight; and the zeolite powder is 20-35 parts by weight.

[0031] The present invention also provides a method for preparing the sheet molding compound resin composite material, the method comprising the following steps:

[0032] A. Mix 60-70 parts by weight of unsaturated resin and 30-40 parts by weight of low shrinkage agent;

[0033] B. adding 140-180 parts by weight of inorganic composite filler while stirring and continuing to stir;

[0034] C. adding 0.5-1.5 parts by weight of a curing agent and stirring to obtain a resin paste;

[0035] D. adding 2 to 6 parts by weight of a thickener to the resin paste, and then impregnating 120 to 150 parts by weight of glass fiber into the resin paste to prepare a sheet molding compound;

[0036] E. Curing the sheet molding compound at a temperature of 35-45°C for 24-48 hours;

[0037] F. Press-molding the cured sheet molding compound at a temperature of 150 to 160° C. for 150 to 220 seconds to obtain a sheet molding compound resin composite material.

[0038] In step A, 0.3 to 1 parts by weight of a polymerization inhibitor, 15 to 35 parts by weight of zeolite powder, and 0.2 to 1 parts by weight of a wetting and dispersing agent are also added;

[0039] After adding the inorganic composite filler in step B, 2 to 6 parts by weight of an internal release agent are added;

[0040] In step C, 1 to 2 parts by weight of a deodorant is also added.

[0041] Optionally, one of the above technical solutions has the following advantages or beneficial effects:

[0042] The SMC resin composite material designed in this invention incorporates appropriate amounts of zeolite powder and a deodorizer. The zeolite powder has a porous structure, providing a large internal surface area and possessing strong ion exchange capacity, making it suitable for adsorbing odorous and harmful organic volatiles such as benzene, aldehydes, ketones, and alkanes. The amino groups in the deodorizer react chemically with aldehydes and other pungent substances produced during the processing of the SMC resin composite material, effectively removing odor. The synergistic effect of the zeolite powder and the deodorizer further reduces the odor of the SMC resin composite material while maintaining the composite material's basic mechanical properties.

[0043] Inorganic composite fillers are added to the SMC resin composite material formula designed by the present invention, and the uniformity, fluidity and mechanical properties of the SMC resin composite material are guaranteed by regulating the optimal ratio of glass microspheres and calcium carbonate.

[0044] At the same time, in the preparation method of the SMC resin composite material, the present invention improves the curing rate of the SMC resin composite material and reduces the generation of incompletely reacted residual odorous substances by controlling the curing temperature and curing time. DETAILED DESCRIPTION

[0045] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts shall fall within the scope of protection of the present invention.

[0046] The present invention provides a sheet molding compound resin paste comprising the following components:

[0047] 60-70 parts by weight of unsaturated resin;

[0048] 30-40 parts by weight of a low shrinkage agent;

[0049] 0.5-1.5 parts by weight of a curing agent;

[0050] 0.3-1 parts by weight of polymerization inhibitor;

[0051] 0.2-1 parts by weight of a wetting and dispersing agent;

[0052] 2-6 parts by weight of an internal release agent;

[0053] 140-180 parts by weight of inorganic composite filler;

[0054] 15-35 parts by weight of zeolite powder;

[0055] 2-6 parts by weight of a thickener;

[0056] 1-2 parts by weight of deodorant.

[0057] Preferably, the unsaturated resin is 65-70 parts by weight; the unsaturated resin includes any one or a combination of at least two of maleic anhydride unsaturated polyester resin, epoxy vinyl ester unsaturated resin, o-phthalic unsaturated polyester resin or isophthalic unsaturated polyester resin, for example, a combination of maleic anhydride unsaturated polyester resin and epoxy vinyl ester unsaturated polyester resin, a combination of o-phthalic unsaturated polyester resin and isophthalic unsaturated polyester resin, etc.

[0058] Preferably, the low-shrinkage agent comprises 35-40 parts by weight; the low-shrinkage agent includes any one of polyvinyl acetate, polystyrene, saturated polyester resin, or polymethyl methacrylate, or a combination of at least two thereof, such as a combination of polyvinyl acetate and polystyrene, or a combination of polystyrene, polyvinyl acetate, and a saturated resin. Those skilled in the art can determine the choice of low-shrinkage agent based on its effect on reducing the shrinkage of the sheet molding compound resin composite material. When a particular combination achieves the optimal composite shrinkage effect, various combinations of any of polyvinyl acetate, polystyrene, saturated polyester resin, or polymethyl methacrylate can be selected.

[0059] Preferably, the curing agent is 1-1.5 parts by weight; the curing agent includes any one or a combination of tert-butyl peroxybenzoate or tert-butyl peroxycarbonate-2-ethylhexyl ester, and the curing agent is used for cross-linking. In an embodiment of the present invention, the preferred curing agent is tert-butyl peroxycarbonate-2-ethylhexyl ester.

[0060] Preferably, the polymerization inhibitor is present in an amount of 0.4-1 parts by weight. The polymerization inhibitor includes any one of hydroquinone, p-benzoquinone, or methylhydroquinone, or a combination of at least two. The polymerization inhibitor affects the curing reaction of the resin paste. The addition of the polymerization inhibitor can effectively prolong the gel time of the resin paste curing reaction and enhance the performance of the SMC resin composite material. In the embodiment of the present invention, the polymerization inhibitor is preferably p-benzoquinone.

[0061] Preferably, the wetting and dispersing agent is present in an amount of 0.8-1 parts by weight. The wetting and dispersing agent includes BYK-W9010 or BYK-W972. The addition of the wetting and dispersing agent helps disperse the inorganic composite filler, enhances the uniformity of the inorganic composite material within the SMC resin composite, and thereby improves the performance of the SMC resin composite. In embodiments of the present invention, BYK-W9010 is preferably used as the wetting and dispersing agent.

[0062] Preferably, the internal mold release agent is 4.6-6 parts by weight, and the internal mold release agent includes zinc stearate or calcium stearate. In the embodiment of the present invention, zinc stearate is preferred.

[0063] Preferably, the inorganic composite filler is 140-180 parts by weight, for example, 145, 150, 155, 160, 165, 170, 175, or 180 parts by weight, but is not limited to the listed values, and other values ​​not listed within this numerical range are also applicable. When the content of the inorganic composite filler is too high, it will lead to uneven dispersion of the composite filler, resulting in reduced uniformity of the SMC resin composite material, thereby deteriorating the performance and surface quality of the composite material; when the content of the inorganic composite filler is too low, the content of the inorganic composite filler in the SMC resin composite material is insufficient, resulting in high cost and increased shrinkage of the SMC resin composite material. The inorganic composite filler has an important influence on enhancing the impact strength and flexural strength of the SMC resin composite material. In an embodiment of the present invention, the inorganic composite filler includes glass microspheres and calcium carbonate in a ratio of (0.5-1.0):(3.0-5.0), preferably (0.5-0.75):(4.5-5). The mass ratio of the glass microspheres to the calcium carbonate in the inorganic composite filler must be controlled within the above-mentioned reasonable range. When the mass ratio of the glass microspheres to the calcium carbonate is too small, the content of the glass microspheres is too low, and the density change of the prepared SMC resin composite material is small, which fails to give full play to the advantages of the glass microspheres and achieves the best fluidity and surface quality of the SMC resin composite material. When the mass ratio of the glass microspheres to the calcium carbonate is too large, the content of the glass microspheres is too high, which may cause the viscosity of the SMC resin composite material to be too low, resulting in molding defects. In an embodiment of the present invention, the particle size of the glass microspheres is 15-150 μm.

[0064] Preferably, the deodorant is present in an amount of 1.2-2 parts by weight. The deodorant comprises poly-β-glucosamine, but may also be any one or more of molecular sieves and nano-silica. In embodiments of the present invention, the deodorant is preferably poly-β-glucosamine. The amino groups in the deodorant react chemically with aldehydes and other pungent substances produced during the processing of the SMC resin composite material, thereby removing odors.

[0065] The zeolite powder preferably contains 20-35 parts by weight, for example, 20, 25, 30, or 35 parts by weight. However, these values ​​are not limited to the values ​​listed above, and other values ​​not listed within this range are also applicable. Zeolite powder has a porous structure, providing a large internal surface area and a strong ion exchange capacity, making it suitable for adsorbing volatile organic compounds such as benzene, aldehydes, ketones, and alkanes that are harmful to the human body and have an unpleasant odor.

[0066] Preferably, the thickener is 4-6 parts by weight, and the thickener includes any one of MgO, CaO or Mg(OH)2 or a combination of at least two thereof. In an embodiment of the present invention, the thickener is preferably magnesium oxide paste, wherein the active ingredient content of the magnesium oxide paste is ≥35%.

[0067] The present invention provides a sheet molding compound resin composite material, comprising a support film, 120-150 parts by weight of glass fiber, and a sheet molding compound resin paste containing the following contents and ingredients:

[0068] 60-70 parts by weight of unsaturated resin;

[0069] 30-40 parts by weight of a low shrinkage agent;

[0070] 0.5-1.5 parts by weight of a curing agent;

[0071] 0.3-1 parts by weight of polymerization inhibitor;

[0072] 0.2-1 parts by weight of a wetting and dispersing agent;

[0073] 2-6 parts by weight of internal release agent;

[0074] 140-180 parts by weight of inorganic composite filler;

[0075] 15-35 parts by weight of zeolite powder;

[0076] 2-6 parts by weight of a thickener;

[0077] 1-2 parts by weight of deodorant.

[0078] In an embodiment of the present invention, the method for preparing the sheet molding compound resin composite material comprises the following steps:

[0079] S1. Prepare a resin paste by mixing 60 to 70 parts by weight of an unsaturated resin, 30 to 40 parts by weight of a low shrinkage agent, 0.3 to 1 parts by weight of a polymerization inhibitor, 15 to 35 parts by weight of zeolite powder and 0.2 to 1 parts by weight of a wetting and dispersing agent;

[0080] S2 is added while stirring 140-180 parts by weight of an inorganic composite filler and 2 to 6 parts by weight of an internal release agent, and then continued stirring;

[0081] S3. Then add 0.5-1.5 parts by weight of curing agent and 1 to 2 parts by weight of deodorant and stir to obtain a resin paste;

[0082] S4. By scraping the mixed resin paste evenly onto the upper and lower support films;

[0083] S5. By a cutter, 120-150 parts by weight of glass fiber is cut into staple fibers of length 25-65mm and evenly spread on the lower support film coated with resin paste;

[0084] S6. The upper and lower support films are bonded to form a "resin paste - glass fiber - resin paste" sandwich structure. The resin paste and glass fiber are then fully impregnated by pressing rollers and excess gas is discharged. Finally, the sheet is formed into a folded cloth shape by a winding machine;

[0085] S7. The sheet is placed in a constant temperature curing chamber and cured at a temperature of 35-45 ℃ for 24-48 hours;

[0086] S8. Place the cured sheet into a mold for compression molding. The mold temperature is controlled at 150-160°C and the holding time is 150-220 seconds. Then, the final product is prepared through processes such as mold opening, trimming, and polishing.

[0087] By controlling the curing temperature and time in step S8, the curing rate of the SMC resin composite material is increased, reducing the generation of residual odorous substances that have not been fully reacted. Furthermore, by increasing the curing temperature, the release and volatilization of residual odorous substances are accelerated, while also maintaining excellent mechanical properties.

[0088] In the embodiment of the present invention, the supporting film in steps S4-S6 can be a polyethylene film.

[0089] Example 1

[0090] A sheet molding compound resin composite material comprising the following components:

[0091]

[0092]

[0093] The method for preparing the sheet molding compound resin composite material in Example 1 comprises the following steps:

[0094] S1. Prepare a resin paste, 65 parts by weight of epoxy vinyl ester unsaturated resin, 35 parts by weight of polystyrene, 0.4 parts by weight of p-benzoquinone, 20 parts by weight of zeolite powder and 0.8 parts by weight of BYK-W9010 were mixed;

[0095] S2 was added while stirring 145 parts by weight of glass beads and calcium carbonate inorganic composite filler, and 4.6 parts by weight of zinc stearate, and then continued stirring; wherein the mass ratio of glass beads and calcium carbonate was 0.5: 4.5;

[0096] S3 was then added 1 part by weight of tert-butyl peroxycarbonate -2-ethylhexyl ester and 1.2 parts by weight of poly β- polyglucosamine and stirred to obtain a resin paste;

[0097] S4. By scraping the mixed resin paste evenly onto the upper and lower support films;

[0098] S5. By a cutter, 135 parts by weight of glass fiber was cut into staple fibers of length 60 mm and evenly spread on the lower support film coated with resin paste;

[0099] S6. The upper and lower support films are bonded to form a "resin paste - glass fiber - resin paste" sandwich structure. The resin paste and glass fiber are then fully impregnated by pressing rollers and excess gas is discharged. Finally, the sheet is formed into a folded cloth shape by a winding machine;

[0100] S7. The sheet is placed in a constant temperature curing chamber and cured at a temperature of 40 ℃ for 36 hours;

[0101] S8. Place the cured sheet into a mold for compression molding. The mold temperature is controlled at 155°C and the holding time is 180 seconds. Then, the final product is prepared through processes such as mold opening, trimming, and polishing.

[0102] Example 2

[0103] A sheet molding compound resin composite material comprising the following components:

[0104]

[0105] The method for preparing the sheet molding compound resin composite material in Example 2 comprises the following steps:

[0106] S1. Prepare a resin paste, 65 parts by weight of maleic anhydride unsaturated polyester resin, 35 parts by weight of polyvinyl acetate, 0.4 parts by weight of hydroquinone, 20 parts by weight of zeolite powder and 0.8 parts by weight of BYK-W972 are mixed;

[0107] S2 was added while stirring 145 parts by weight of glass beads and calcium carbonate inorganic composite filler, and 4.6 parts by weight of calcium stearate, and then continued stirring; wherein the mass ratio of glass beads and calcium carbonate was 0.5: 4.5;

[0108] S3 was then added 1 part by weight of tert-butyl perbenzoate and 1.5 parts by weight of poly β-glucosamine and stirred to obtain a resin paste;

[0109] S4. By scraping the mixed resin paste evenly onto the upper and lower support films;

[0110] S5. By a cutter, 135 parts by weight of glass fiber was cut into staple fibers of length 60 mm and evenly spread on the lower support film coated with resin paste;

[0111] S6. The upper and lower support films are bonded to form a "resin paste - glass fiber - resin paste" sandwich structure. The resin paste and glass fiber are then fully impregnated by pressing rollers and excess gas is discharged. Finally, the sheet is formed into a folded cloth shape by a winding machine;

[0112] S7. The sheet is placed in a constant temperature curing chamber and cured at a temperature of 40 ℃ for 36 hours;

[0113] S8. Place the cured sheet into a mold for compression molding. The mold temperature is controlled at 155°C and the holding time is 180 seconds. Then, the final product is prepared through processes such as mold opening, trimming, and polishing.

[0114] Example 3

[0115] A sheet molding compound resin composite material comprising the following components:

[0116]

[0117] The method for preparing the sheet molding compound resin composite material in Example 3 comprises the following steps:

[0118] S1. Prepare a resin paste, 65 parts by weight of epoxy vinyl ester unsaturated resin, 35 parts by weight of polystyrene, 0.4 parts by weight of p-benzoquinone, 25 parts by weight of zeolite powder and 0.8 parts by weight of BYK-W9010 were mixed;

[0119] S2 was added while stirring 140 parts by weight of glass beads and calcium carbonate inorganic composite filler, and 4.6 parts by weight of zinc stearate, and then continued stirring; wherein the mass ratio of glass beads and calcium carbonate was 0.5: 4.5;

[0120] S3 was then added 1 part by weight of tert-butyl peroxycarbonate -2-ethylhexyl ester and 1.2 parts by weight of poly β- polyglucosamine and stirred to obtain a resin paste;

[0121] S4. By scraping the mixed resin paste evenly onto the upper and lower support films;

[0122] S5. By a cutter, 135 parts by weight of glass fiber was cut into staple fibers of length 60 mm and evenly spread on the lower support film coated with resin paste;

[0123] S6. The upper and lower support films are bonded to form a "resin paste - glass fiber - resin paste" sandwich structure. The resin paste and glass fiber are then fully impregnated by pressing rollers and excess gas is discharged. Finally, the sheet is formed into a folded cloth shape by a winding machine;

[0124] S7. The sheet is placed in a constant temperature curing chamber and cured at a temperature of 40 ℃ for 36 hours;

[0125] S8. Place the cured sheet into a mold for compression molding. The mold temperature is controlled at 155°C and the holding time is 180 seconds. Then, the final product is prepared through processes such as mold opening, trimming, and polishing.

[0126] The performance testing method of the SMC resin composite material in Examples 1-3 is as follows:

[0127] (1) Tensile strength and tensile modulus test, refer to ISO527-2;

[0128] (2) Flexural strength and flexural modulus test, refer to ISO 178;

[0129] (3) Impact strength test, refer to ISO 179;

[0130] (4) Odor level test: referring to the PV3900 standard, the SMC resin composite material was heated at 80°C for 2 hours and then cooled to 60°C. The odor was evaluated by five odor evaluators, and the test results were averaged;

[0131] Odor level standard: no odor - level 1; odor, but not obvious - level 2; obvious odor, but not irritating - level 3; pungent odor - level 4; strong irritating odor - level 5; unbearable odor - level 6;

[0132] Table 1 Summary of test results

[0133] Performance indicators Example 1 Example 2 Example 3 Tensile strength / MPa 103.6 102.8 102.4 Tensile modulus / GPa 9687 9574 9425 Bending strength / MPa 170.6 165.7 163.6 Flexural modulus / GPa 10371 9683 9594 <![CDATA[Impact strength / KJ / M 2 > 106.3 108.2 110.6 Odor / Grade 3.7 3.5 3.7

[0134] As shown in Table 1, the SMC resin composite material prepared by the present invention includes components such as unsaturated resin, low shrinkage agent, and curing agent. Through reasonable proportioning and curing process control, it has good mechanical properties, tensile strength of 102.4-103.6 MPa, tensile modulus of 9425-9687 GPa, flexural strength of 163.6-170.6 MPa, flexural modulus of 9594-10371 GPa, and impact strength of 106.3-110.6 KJ / M 2 At the same time, the addition of zeolite powder and deodorizer further reduces the odor through a combination of adsorption and chemical reaction, while also ensuring the basic mechanical properties of the material.

[0135] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any modifications or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be based on the scope of protection of the claims.

Claims

1. A sheet molding compound resin composite material, characterized in that: The resin composite material comprises the following components: 60-70 parts by weight of unsaturated resin; 30-40 parts by weight of a low shrinkage agent; 0.5-1.5 parts by weight of a curing agent; 0.3-1 parts by weight of polymerization inhibitor; 0.2-1 parts by weight of a wetting and dispersing agent; 2-6 parts by weight of an internal release agent; 140-180 parts by weight of inorganic composite filler; 15-35 parts by weight of zeolite powder; 120-150 parts by weight of glass fiber; 2-6 parts by weight of a thickener; 1-2 parts by weight of deodorant.

2. The sheet molding compound resin composite material according to claim 1, wherein The unsaturated resin includes any one of maleic anhydride unsaturated polyester resin, epoxy vinyl ester unsaturated resin, o-phthalic unsaturated polyester resin or isophthalic unsaturated polyester resin, or a combination of at least two of them.

3. The sheet molding compound resin composite material according to claim 1, wherein The low shrinkage agent includes any one of polyvinyl acetate, polyvinyl acetate, polystyrene, saturated polyester resin or polymethyl methacrylate, or a combination of at least two thereof.

4. The sheet molding compound resin composite material according to claim 1, wherein The curing agent includes any one of tert-butyl perbenzoate and tert-butyl peroxycarbonate-2-ethylhexyl ester, or a combination of the two.

5. The sheet molding compound resin composite material according to claim 1, wherein The polymerization inhibitor includes any one of hydroquinone, p-benzoquinone or methylhydroquinone or a combination of at least two thereof; the wetting and dispersing agent includes BYK-W9010 or BYK-W972; and the internal release agent includes zinc stearate or calcium stearate.

6. The sheet molding compound resin composite material according to claim 1, wherein The inorganic composite filler comprises glass microspheres and calcium carbonate in a mass ratio of (0.5-1.0):(3.0-5.0).

7. The sheet molding compound resin composite material according to claim 1, wherein The thickener includes any one of MgO, CaO or Mg(OH)2 or a combination of at least two of them.

8. The sheet molding compound resin composite material according to claim 1, wherein The deodorant comprises any one of poly-β-polyglucosamine, molecular sieve or nano silicon dioxide or a combination of at least two of them.

9. A method for preparing the sheet molding compound resin composite material according to any one of claims 1 to 8, characterized in that: The method comprises the following steps: A. Mix 60-70 parts by weight of unsaturated resin and 30-40 parts by weight of low shrinkage agent; B. adding 140-180 parts by weight of inorganic composite filler while stirring and continuing to stir; C. adding 0.5-1.5 parts by weight of a curing agent and stirring to obtain a resin paste; D. adding 2 to 6 parts by weight of a thickener to the resin paste, and then impregnating 120 to 150 parts by weight of glass fiber into the resin paste to prepare a sheet molding compound; E. Curing the sheet molding compound at a temperature of 35-45°C for 24-48 hours; F. Press-molding the cured sheet molding compound at a temperature of 150 to 160° C. for 150 to 220 seconds to obtain a sheet molding compound resin composite material.

10. The method for preparing the sheet molding compound resin composite material according to claim 9, wherein: In step A, 0.3 to 1 parts by weight of a polymerization inhibitor, 15 to 35 parts by weight of zeolite powder, and 0.2 to 1 parts by weight of a wetting and dispersing agent are also added; in step B, 2 to 6 parts by weight of an internal release agent are added after the inorganic composite filler is added; and in step C, 1 to 2 parts by weight of a deodorant is also added.

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