Sheet molding compound with fragrance slow-release function and preparation method thereof

Abstract

The invention discloses a sheet molding compound with a fragrance slow-release function and a preparation method of the sheet molding compound, and relates to the technical field of sheet molding compounds. According to the flaky molding compound with the fragrance slow-release function, specially-made pretreated flavoring agent particles are added into the material, the particles take porous quartz powder as a carrier to load a flavoring agent, and a pore structure is formed by volatilizing ethyl alcohol in the preparation process to increase the volatilization specific surface area of the flavoring agent; and finally, unsaturated resin is used for curing and coating, so that the effective load and stable release of the flavoring agent are ensured, and the problem of premature volatilization or non-uniform release of fragrance is avoided. The prepared sheet molding compound with the fragrance slow-release function not only has the excellent performance of a traditional sheet molding compound, but also can continuously release fragrance in the use process, effectively improves the air quality of environments such as toilets and the like, and improves the use experience of users.

Description

Technical Field

[0001] The present invention relates to the technical field of sheet molding compounds, and specifically relates to a sheet molding compound with a fragrance slow-release function and a preparation method thereof. Background Art

[0002] Sheet molding compound is abbreviated as SMC. This is a sandwich molding raw material. Its core material is chopped strand mat glass fiber, impregnated with resin paste (including resin, filler, low shrinkage agent, internal release agent, thickener, color paste, initiator, etc.). The upper and lower surfaces are sheet materials covered with polypropylene film. When sheet molding compound is molded, the prepared sheet is weighed, cut, the film is removed and put into a mold at a specific temperature, and then demolded after applying a certain high pressure to obtain the product. It has the characteristics of high strength, good toughness, high surface flatness, good gloss, strong stain resistance, simple molding processing and strong designability, and is currently widely used in the field of integral bathroom. However, on the one hand, the integral bathroom products molded with sheet molding compound will release a slight smell for a period of time after molding itself. On the other hand, there are generally odor problems during the use of the bathroom, which reduces the use experience of the public and makes people feel down. Therefore, the present invention researches and prepares a sheet molding compound with a fragrance slow-release function to solve the above problems. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide a sheet molding compound with a fragrance slow-release function and a preparation method thereof.

[0004] A technical solution proposed by the present invention to solve the above technical problem is: A sheet molding compound with a fragrance slow-release function includes the following components by weight: 60-90 parts of unsaturated polyester resin, 10-40 parts of low shrinkage additive, 0.02-0.1 part of inhibitor, 2-8 parts of diluent, 0-4 parts of viscosity reducer, 0-3 parts of phase separation inhibitor, 4-6 parts of internal release agent, 15-30 parts of pretreated fragrance mixture particles, 100-180 parts of inorganic filler, 1-2 parts of curing agent, 3-8 parts of thickener, and 50-120 parts of chopped glass fiber.

[0005] Preferably, the unsaturated polyester resin is an orthophthalic neopentyl glycol or isophthalic neopentyl glycol type unsaturated polyester resin with a solid content of 60-65%.

[0006] Preferably, the low shrinkage additive is one or a mixture of more of saturated polyester, polystyrene, and polyvinyl acetate; the inhibitor is one or a mixture of two of p-benzoquinone and 2,6-di-tert-butyl-p-cresol.

[0007] Preferably, the viscosity reducer is one of BYK-W9010 and BYK-W996; the anti-phase separation agent is BYK-W972; the internal mold release agent is one or a mixture of two of zinc stearate or BKY-P9065.

[0008] Preferably, the diluent is one or a mixture of styrene, diallyl phthalate or methyl methacrylate; the inorganic filler is one or a mixture of calcium carbonate, aluminum hydroxide and barium sulfate; the curing agent is one or a mixture of tert-butyl peroxybenzoate, tert-butyl peroxy-2-ethylhexanoate and tert-butyl peroxyisopropyl carbonate.

[0009] Preferably, the chopped glass fiber is a chopped glass fiber with a length of 25 mm; the thickening agent is magnesium oxide.

[0010] Preferably, the method for preparing the pretreated flavorant mixture particles is as follows: Add porous quartz powder into a wet granulator, spray in an ethanol solution of the flavorant for premixing, then spray in unsaturated polyester resin and mix evenly before granulating. The mass ratio of the porous quartz powder, the ethanol solution of the sprayed flavorant to the unsaturated polyester resin is 75-85:5-10:8-15, and the volume ratio of the flavorant to ethanol is 1-3:10. Then place it in an oven at 70 °C and gradually heat up to 105 °C, and keep it warm for 2-4 h to obtain the pretreated flavorant mixture particles.

[0011] Preferably, the particle size of the porous quartz powder is 200-400 mesh; the mesh number of the pretreated flavorant mixture particles is 40-60 mesh.

[0012] Preferably, the method for preparing the sheet molding compound with a fragrance slow-release function includes the following specific steps:

[0013] S1. Pour the unsaturated polyester resin, low shrinkage additive, inhibitor, diluent, viscosity reducer and dispersant into a stirring kettle in sequence. After stirring at 800-1200 r / min for 3-5 min, add aluminum hydroxide, calcium carbonate and internal mold release agent while stirring. After stirring for 3-5 min, add the pretreated flavorant mixture particles while stirring. After stirring for 3-5 min, add the curing agent and heat up to 38-42 °C to obtain a resin paste:

[0014] S2. Mix the resin paste with glass fiber, and evenly coat it on the surface of a polypropylene film through a scraper. Compose the coated polypropylene films with each other, extrude them through a compactor to form a sheet, and then wind it up to obtain a sheet molding compound with a fragrance slow-release function; Cure the sheet molding compound at 45-50 °C for 24-32 h, tear off the polypropylene films on the front and back of the sheet molding compound, put it into a preheated mold, carry out compression molding. After the compression molding is completed, take it out and trim the edges to obtain a sheet molding product with continuously emitting fragrance.

[0015] Preferably, in the above step S3, the preparation method of hydroxyethyl oxazolidine is as follows: Mix toluene and diethanolamine in a mass ratio of 2:1 to 1.04, stir evenly, then heat up to 40-42 °C, and dropwise add acetone which is 1.1-1.3 times the mass of diethanolamine at a rate of 1-3 ml / min. React for 1-2 h, then heat up to 60-62 °C and reflux for 3-5 h. After cooling to room temperature, perform vacuum fractional distillation and collect the fraction at 65 °C to obtain hydroxyethyl oxazolidine.

[0016] Preferably, in the above step S2, the front temperature of the molding die is 140-150 °C, the back temperature is 130-140 °C, and the molding pressure is 80-100 Kgf / cm 2 , and the pressure holding time is 4-6 min.

[0017] Compared with the prior art, the beneficial effects achieved by the present invention are as follows:

[0018] The sheet molding compound with fragrance slow-release function prepared by the present invention adds special pretreated fragrance agent particles to the conventional sheet molding compound material. The particles use porous quartz powder as a carrier to load the fragrance agent. During the preparation process, pore structures are formed by volatilizing ethanol to increase the specific surface area of fragrance agent volatilization. Finally, it is coated by curing with unsaturated resin to ensure the effective loading and stable release of the fragrance agent, and avoid the problems of premature fragrance volatilization or uneven release. The boiling point of ethanol is 78.3 °C. During the process of gradually heating the particles from 60-70 °C to 100-105 °C in the oven, the ethanol in the particles changes from liquid to gas, expands in volume, and volatilizes from it, making the particles form pore structures. The prepared sheet molding compound with fragrance slow-release function not only has excellent properties of traditional sheet molding compounds, but also can continuously release fragrance during use, effectively improving the air quality of environments such as bathrooms and enhancing the user experience. Detailed Embodiments

[0019] The present invention will be specifically described below through examples. It is necessary to point out here that the following examples are only used to further illustrate the present invention and should not be construed as limiting the protection scope of the present invention. Those skilled in the art can make some non-essential improvements and adjustments to the present invention based on the above content of the present invention. Unless otherwise defined, all professional and scientific terms used herein have the same meaning as those familiar to those skilled in the art.

[0020] The fragrance agent used in the present invention can be a natural fragrance agent or a synthetic fragrance agent.

[0021] The specific surface area of the porous quartz powder used in the present invention is 8.3-8.5 m 2 / g, and the average pore diameter is about 8.8 nm.

[0022] Example 1

[0023] In this example, the weight parts of the components for preparing the sheet molding compound with fragrance slow-release function are as follows:

[0024] 60 parts of unsaturated polyester resin, 10 parts of low shrinkage additive, 0.02 part of inhibitor, 2 parts of diluent, 0 part of viscosity reducer, 0 part of phase separation inhibitor, 4 parts of internal mold release agent, 15 parts of pretreated fragrance mixture particles, 100 parts of inorganic filler, 1 part of curing agent, 3 parts of thickener, 50 parts of chopped glass fiber; the unsaturated polyester resin is a phthalic neopentyl glycol type unsaturated polyester resin with a solid content of 60%; the low shrinkage additive is a saturated polyester; the inhibitor is 2,6-di-tert-butyl-p-cresol; the viscosity reducer is BYK-W9010; the phase separation inhibitor is BYK-W972; the internal mold release agent is zinc stearate; the diluent is styrene; the inorganic filler is calcium carbonate; the curing agent is tert-butyl peroxybenzoate; the chopped glass fiber is chopped glass fiber with a length of 25 mm; the thickener is magnesium oxide; the particle size of the porous quartz powder is 200 mesh; the mesh number of the pretreated fragrance mixture particles is 40 - 60 mesh; the fragrance agent is a lemon flavor fragrance agent;

[0025] The preparation method of the sheet molding compound with fragrance slow-release function in this example is as follows:

[0026] S1. Add porous quartz powder into a wet granulator, spray in an ethanol solution of the fragrance agent for premixing, then spray in the unsaturated polyester resin and mix evenly before granulating. The mass ratio of the porous quartz powder, the ethanol solution of the sprayed fragrance agent to the unsaturated polyester resin is 75:5:8, the volume ratio of the fragrance agent to ethanol is 1:10, and then place it in an oven at 70°C and gradually heat up to 105°C, keep warm for 2 h to obtain the pretreated fragrance mixture particles;

[0027] S2. Pour the unsaturated polyester resin, low shrinkage additive, inhibitor, diluent, viscosity reducer, and dispersant into a stirring kettle in sequence, stir at 800 r / min for 3 min, then add aluminum hydroxide, calcium carbonate, and internal mold release agent while stirring, stir for 3 min, then add the pretreated fragrance mixture particles while stirring, stir for 3 min, and then add the curing agent and heat up to 38°C to obtain a resin paste:

[0028] S3. Mix the resin paste with the glass fiber, and evenly coat it on the surface of a polypropylene film through a scraper. Compound the coated polypropylene films with each other, extrude them through a compactor to form a sheet, and then wind it up to obtain the sheet molding compound with fragrance slow-release function; cure the sheet molding compound at 50°C for 24 h, tear off the polypropylene films on the front and back of the sheet molding compound, put it into a preheated mold, and carry out compression molding. The temperature on the front of the molding mold is 140°C, the temperature on the back is 130°C, and the compression molding pressure is 80 Kgf / cm 2, the pressure holding time is 4 min. After the compression molding is completed, take out and trim the edges to obtain the sheet molding compound with continuous fragrance emission.

[0029] Example 2

[0030] In this example, the weight parts of the components for preparing the sheet molding compound with fragrance slow-release function are as follows:

[0031] 75 parts of unsaturated polyester resin, 30 parts of low shrinkage additive, 0.06 part of inhibitor, 6 parts of diluent, 2 parts of viscosity reducer, 1.5 parts of anti-phase separation agent, 5 parts of internal mold release agent, 22 parts of pretreated fragrance mixture particles, 140 parts of inorganic filler, 1.5 parts of curing agent, 5 parts of thickener, 85 parts of chopped glass fiber; the unsaturated polyester resin is an isophthalic neopentyl glycol type unsaturated polyester resin with a solid content of 63%; the low shrinkage additive is polyvinyl acetate; the inhibitor is p-benzoquinone; the viscosity reducer is BYK-9010; the anti-phase separation agent is BYK-W972; the internal mold release agent is zinc stearate; the diluent is styrene; the inorganic filler is aluminum hydroxide; the curing agent is tert-butyl peroxybenzoate; the chopped glass fiber is chopped glass fiber with a length of 25 mm; the thickener is magnesium oxide; the particle size of the porous quartz powder is 300 mesh; the mesh number of the pretreated fragrance mixture particles is 40 - 60 mesh; the fragrance agent is eau de cologne fragrance agent;

[0032] The preparation method of the sheet molding compound with fragrance slow-release function in this example is as follows:

[0033] S1. Add porous quartz powder into a wet granulator, spray in the ethanol solution of the fragrance agent for premixing, then spray in the unsaturated polyester resin and mix evenly before granulating. The mass ratio of the porous quartz powder, the ethanol solution of the sprayed fragrance agent to the unsaturated polyester resin is 80:8:12, the volume ratio of the fragrance agent to ethanol is 2:10, and then place it in an oven at 70 °C and gradually heat up to 105 °C, keep warm for 3 h to obtain the pretreated fragrance mixture particles;

[0034] S2. Pour the unsaturated polyester resin, low shrinkage additive, inhibitor, diluent, viscosity reducer, and dispersant into a stirring kettle in sequence. After stirring at 1000 r / min for 4 min, add aluminum hydroxide, calcium carbonate, and internal mold release agent while stirring. After stirring for 4 min, add the pretreated fragrance mixture particles while stirring. After stirring for 4 min, add the curing agent and heat up to 40 °C to obtain the resin paste:

[0035] S3. Mix the resin paste with glass fiber, and evenly coat it on the surface of the polypropylene film with a scraper. Compose the coated polypropylene films with each other, extrude them with a compactor to form a sheet, and then wind it up to obtain a sheet molding compound with fragrance slow-release function. Cure the sheet molding compound at 50°C for 24 h, tear off the polypropylene films on both sides of the sheet molding compound, put it into a preheated mold, and carry out compression molding. The front temperature of the molding mold is 145°C, the reverse temperature is 135°C, and the compression molding pressure is 90 Kgf / cm 2 , and the pressure holding time is 5 min. After the compression molding is completed, take it out and trim it to obtain a sheet molding product with continuous fragrance emission.

[0036] Example 3

[0037] In this example, the weight parts of the components for preparing the sheet molding compound with fragrance slow-release function are as follows:

[0038] 90 parts of unsaturated polyester resin, 40 parts of low shrinkage additive, 0.1 part of inhibitor, 8 parts of diluent, 4 parts of viscosity reducer, 3 parts of anti-phase separation agent, 6 parts of internal mold release agent, 30 parts of pretreated fragrance mixture particles, 180 parts of inorganic filler, 2 parts of curing agent, 8 parts of thickener, 120 parts of chopped glass fiber; the unsaturated polyester resin is an isophthaloneopentyl glycol type unsaturated polyester resin with a solid content of 65%; the low shrinkage additive is polyvinyl acetate; the inhibitor is 2,6-di-tert-butyl-p-cresol; the viscosity reducer is BYK-W996; the anti-phase separation agent is BYK-W972; the internal mold release agent is BKY-P9065; the diluent is methyl methacrylate; the inorganic filler is barium sulfate; the curing agent is tert-butyl peroxyisopropyl carbonate; the chopped glass fiber is chopped glass fiber with a length of 25 mm; the thickener is magnesium oxide; the particle size of the porous quartz powder is 400 mesh; the particle size of the pretreated fragrance mixture particles is 40 - 60 mesh; the fragrance agent is lavender fragrance agent;

[0039] In this example, the preparation method of the sheet molding compound with fragrance slow-release function is as follows:

[0040] S1. Add porous quartz powder into a wet granulator, spray in the ethanol solution of the fragrance agent for premixing, and then spray in the unsaturated polyester resin and mix evenly before granulating. The mass ratio of the porous quartz powder, the ethanol solution of the sprayed fragrance agent to the unsaturated polyester resin is 85:10:15, the volume ratio of the fragrance agent to ethanol is 3:10, and then place it in an oven at 70°C and gradually heat up to 105°C, and keep it warm for 4 h to obtain the pretreated fragrance mixture particles;

[0041] S2. Pour unsaturated polyester resin, low shrinkage additive, inhibitor, diluent, viscosity reducer, and dispersant into the stirring kettle in sequence. After stirring at 1200 r / min for 5 min, add aluminum hydroxide, calcium carbonate, and internal mold release agent while stirring. After stirring for 5 min, add the pretreated flavorant mixture particles while stirring. After stirring for 5 min, add the curing agent and heat up to 42 °C to obtain a resin paste:

[0042] S3. Mix the resin paste with glass fiber and evenly coat it on the surface of the polypropylene film with a scraper. Compose the coated polypropylene films with each other, extrude them with a compactor to form a sheet, and then wind it up to obtain a sheet molding compound with fragrance slow-release function. Cure the sheet molding compound at 50 °C for 24 h, tear off the polypropylene films on both the front and back of the sheet molding compound, put it into a preheated mold, and perform compression molding. The front temperature of the molding mold is 150 °C, the back temperature is 140 °C, and the compression molding pressure is 100 Kgf / cm 2 , and the pressure holding time is 6 min. After the compression molding is completed, take it out and trim it to obtain a sheet molding product with continuous fragrance emission.

[0043] Example 4

[0044] In this example, the weight parts of the components for preparing the sheet molding compound with fragrance slow-release function are as follows:

[0045] 75 parts of unsaturated polyester resin, 30 parts of low shrinkage additive, 0.06 part of inhibitor, 6 parts of diluent, 2 parts of viscosity reducer, 1.5 parts of anti-phase separation agent, 5 parts of internal mold release agent, 22 parts of pretreated flavorant mixture particles, 140 parts of inorganic filler, 1.5 parts of curing agent, 5 parts of thickening agent, 85 parts of chopped glass fiber; the unsaturated polyester resin is a neopentyl glycol type unsaturated polyester resin with a solid content of 63%; the low shrinkage additive is polystyrene; the inhibitor is p-benzoquinone; the viscosity reducer is BYK-9010; the anti-phase separation agent is BYK-W972; the internal mold release agent is zinc stearate; the diluent is styrene; the inorganic filler is aluminum hydroxide; the curing agent is tert-butyl peroxyisopropyl carbonate; the chopped glass fiber is chopped glass fiber with a length of 25 mm; the thickening agent is magnesium oxide; the particle size of the porous quartz powder is 300 mesh; the particle size of the pretreated flavorant mixture particles is between 40 and 60 mesh; the flavorant is a rose flavorant;

[0046] In this example, the preparation method of the sheet molding compound with fragrance slow-release function is as follows:

[0047] S1. Add porous quartz powder into a wet granulator, spray in an ethanol solution of the flavoring agent for premixing, then spray in unsaturated polyester resin, mix evenly and granulate. The mass ratio of the porous quartz powder, the ethanol solution of the flavoring agent to the unsaturated polyester is 80:8:12, and the volume ratio of the flavoring agent to ethanol is 2:10. Then place it in an oven at 70°C and gradually heat up to 105°C, and keep it warm for 3 h to obtain pre-treated flavoring agent mixture particles;

[0048] S2. Pour unsaturated polyester resin, low shrinkage additive, inhibitor, diluent, viscosity reducer, dispersant into a stirring kettle in sequence. After stirring at 1000 r / min for 4 min, add aluminum hydroxide, calcium carbonate, internal mold release agent while stirring. After stirring for 4 min, add the pre-treated flavoring agent mixture particles while stirring. After stirring for 4 min, add the curing agent and heat up to 40°C to obtain a resin paste:

[0049] S3. Mix the resin paste with glass fiber, and evenly coat it on the surface of a polypropylene film through a scraper. Compose the coated polypropylene films with each other, extrude them through a compactor to form a sheet, and then wind it up to obtain a sheet molding compound with a fragrance slow-release function; Cure the sheet molding compound at 45°C for 32 h, tear off the polypropylene films on both sides of the sheet molding compound, put it into a pre-heated mold, and carry out molding. The temperature on the front side of the molding mold is 145°C, the temperature on the back side is 135°C, the molding pressure is 100 Kgf / cm2, and the pressure holding time is 5 min. After the molding is completed, take it out and trim it to obtain a sheet molding product with continuous fragrance emission.

[0050] Comparative Example 1

[0051] The weight parts of the components for preparing the sheet molding compound with a fragrance slow-release function in this example are as follows:

[0052] 60 parts of unsaturated polyester resin, 10 parts of low shrinkage additive, 0.02 part of inhibitor, 2 parts of diluent, 0 part of viscosity reducer, 0 part of phase separation inhibitor, 4 parts of internal mold release agent, 15 parts of pre-treated flavoring agent mixture particles, 100 parts of inorganic filler, 1 part of curing agent, 3 parts of thickening agent, 50 parts of chopped glass fiber; The unsaturated polyester resin is a phthalic neopentyl glycol type unsaturated polyester resin with a solid content of 60%; The low shrinkage additive is a saturated polyester; The inhibitor is 2,6-di-tert-butyl-p-cresol; The viscosity reducer is BYK-W9010; The phase separation inhibitor is BYK-W972; The internal mold release agent is zinc stearate; The diluent is styrene; The inorganic filler is calcium carbonate; The curing agent is tert-butyl peroxybenzoate; The chopped glass fiber is chopped glass fiber with a length of 25 mm; The thickening agent is magnesium oxide; The flavoring agent is a lemon flavoring agent;

[0053] The preparation method of the sheet molding compound with a fragrance slow-release function in this example is as follows:

[0054] S1. Pour unsaturated polyester resin, low shrinkage additive, inhibitor, diluent, viscosity reducer, and dispersant into a stirring kettle in sequence. After stirring at 800 r / min for 3 min, add aluminum hydroxide, calcium carbonate, and internal mold release agent while stirring. After stirring for 3 min, add lemon flavoring agent while stirring. After stirring for 3 min, add curing agent and heat up to 38 °C to obtain resin paste:

[0055] S2. Mix the resin paste with glass fiber and evenly coat it on the surface of polypropylene film with a scraper. Compound the coated polypropylene films with each other, extrude them with a compactor to form sheets, and then wind them up to obtain sheet molding compound with fragrance slow-release function. Cure the sheet molding compound at 50 °C for 24 h, tear off the polypropylene films on both sides of the sheet molding compound, put it into a preheated mold, and carry out compression molding. The front temperature of the molding mold is 140 °C, the back temperature is 130 °C, the compression molding pressure is 80 Kgf / cm2, and the pressure holding time is 4 min. After the compression molding is completed, take it out and trim it to obtain sheet molding product with continuous fragrance emission.

[0056] Comparative Example 2

[0057] The weight parts of the components for preparing the sheet molding compound with fragrance slow-release function in this example are as follows:

[0058] 60 parts of unsaturated polyester resin, 10 parts of low shrinkage additive, 0.02 parts of inhibitor, 2 parts of diluent, 0 parts of viscosity reducer, 0 parts of anti-phase separation agent, 4 parts of internal mold release agent, 15 parts of pretreated fragrance agent mixture particles, 100 parts of inorganic filler, 1 part of curing agent, 3 parts of thickening agent, 50 parts of chopped glass fiber; the unsaturated polyester resin is o-phthalic neopentyl glycol type unsaturated polyester resin with a solid content of 60%; the low shrinkage additive is saturated polyester; the inhibitor is 2,6-di-tert-butyl-p-cresol; the viscosity reducer is BYK-W9010; the anti-phase separation agent is BYK-W972; the internal mold release agent is zinc stearate; the diluent is styrene; the inorganic filler is calcium carbonate; the curing agent is tert-butyl peroxybenzoate; the chopped glass fiber is chopped glass fiber with a length of 25 mm; the thickening agent is magnesium oxide; the flavoring agent is microcapsule type lemon flavoring agent;

[0059] The preparation method of the sheet molding compound with fragrance slow-release function in this example is as follows:

[0060] S1. Pour unsaturated polyester resin, low shrinkage additive, inhibitor, diluent, viscosity reducer, and dispersant into a stirring kettle in sequence. After stirring at 800 r / min for 3 min, add aluminum hydroxide, calcium carbonate, and internal mold release agent while stirring. After stirring for 3 min, add microcapsule type lemon flavoring agent while stirring. After stirring for 3 min, add curing agent and heat up to 38 °C to obtain resin paste:

[0061] S2. Mix the resin paste with glass fiber, and evenly coat it on the surface of the polypropylene film with a scraper. Compound the coated polypropylene films with each other, extrude them with a compactor to form a sheet, and then wind it up to obtain a sheet molding compound with a fragrance slow-release function. Cure the sheet molding compound at 50 °C for 24 h, tear off the polypropylene films on both sides of the sheet molding compound, put it into a preheated mold, and carry out compression molding. The front temperature of the molding mold is 140 °C, the back temperature is 130 °C, the compression molding pressure is 80 Kgf / cm2, and the pressure holding time is 4 min. After the compression molding is completed, take it out and trim it to obtain a sheet molding product with continuously emitting fragrance.

[0062] Effect Example

[0063] The test performance methods of Examples 1-4 and Comparative Examples 1-2 are as follows, and the test results are shown in Table 1

[0064] The odor grade refers to the odor grade classification of Chery automobile interior (Q / SQR T1-8.4-2012)

[0065] Detection method: Cut the obtained 4-mm-thick flat plate into 50-mm * 50-mm sample blocks. Place them in a constant temperature oven at 40 °C and evaluate the odor grade every 1 month

[0066] Grade 5 - There is a strong interfering odor

[0067] Grade 4 - Interfering odor

[0068] Grade 3 - There is an obvious odor, but there is still no interference

[0069] Grade 2 - There is an odor but no interference

[0070] Grade 1 - No odor

[0071] The following Table 1 odor test data table shows the performance test results of the sheet molding compounds with a fragrance slow-release function prepared in the examples and comparative examples;

[0072] Table 1

[0073]

[0074]

[0075] It can be seen from the test results of the examples and comparative examples in Table 1 that in Examples 1-4, the fragrance agent was pre-coated with unsaturated polyester resin, and the fragrance agent component was added to the sheet molding compound formula in Comparative Examples 1-2. By comparing Examples 1-4 and Comparative Examples 1-2, it was found that the fragrance emitted by the material prepared by pre-coating the fragrance agent with unsaturated polyester resin was softer and more lasting.

[0076] Obviously, the above embodiments are merely examples given to clearly illustrate the embodiments of the present invention, and are not limitations on the embodiments of the present invention. For those of ordinary skill in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to enumerate all the embodiments here. And these obvious changes or modifications derived from the spirit of the present invention are still within the protection scope of the present invention.

Claims

1. A sheet molding compound with a fragrance sustained-release function, characterized in that: The invention comprises the following components by weight: 60-90 parts of unsaturated polyester resin, 10-40 parts of low shrinkage additive, 0.02-0.1 parts of polymerization inhibitor, 2-8 parts of diluent, 0-4 parts of viscosity reducer, 0-3 parts of anti-phase separation agent, 4-6 parts of internal release agent, 15-30 parts of pre-treated flavoring agent mixture particles, 100-180 parts of inorganic filler, 1-2 parts of curing agent, 3-8 parts of thickener, and 50-120 parts of chopped glass fiber; the preparation method of the pre-treated flavoring agent mixture particles is as follows: adding porous quartz powder to a wet granulator, spraying an ethanol solution of the flavoring agent for pre-mixing, spraying unsaturated polyester resin for mixing evenly, and then granulating, and then placing in a 60-70° C. oven and gradually heating to 100-105° C., keeping the temperature for 2-4 hours, to obtain the pre-treated flavoring agent mixture particles.

2. The sheet molding compound with a fragrance sustained-release function according to claim 1, characterized in that: The unsaturated polyester resin is an unsaturated polyester resin of the o-phenylene neopentyl glycol or iso-phenylene neopentyl glycol type with a solid content of 60-65%.

3. The sheet molding compound with a fragrance sustained-release function according to claim 1, characterized in that: The low shrinkage additive is a mixture of one or more of saturated polyester, polystyrene and polyvinyl acetate; the polymerization inhibitor is a mixture of one or two of p-benzoquinone and 2,6-di-tert-butyl-p-cresol.

4. The sheet molding compound with a fragrance sustained-release function according to claim 1, characterized in that: The viscosity reducer is one of BYK-W9010 and BYK-W996; the anti-phase separation agent is BYK-W972; and the internal mold release agent is one of zinc stearate and BKY-P9065 or a mixture of the two.

5. The sheet molding compound with a fragrance sustained-release function according to claim 1, characterized in that: The diluent is one or a mixture of styrene, diallyl phthalate or methyl methacrylate; the inorganic filler is one or a mixture of calcium carbonate, aluminum hydroxide and barium sulfate; the curing agent is one or a mixture of tert-butyl peroxybenzoate, tert-butyl peroxy-2-ethylhexanoate and tert-butyl peroxyisopropyl carbonate.

6. The sheet molding compound with a fragrance sustained-release function according to claim 1, characterized in that: The chopped glass fibers are chopped glass fibers with a length of 25 mm; and the thickener is magnesium oxide.

7. The sheet molding compound with a fragrance sustained-release function according to claim 1, characterized in that: The mass ratio of porous quartz powder, ethanol solution of flavoring agent and unsaturated polyester resin is 75-85:5-10:8-15, and the volume ratio of flavoring agent to ethanol in the ethanol solution of flavoring agent is 1-3:

10.

8. The sheet molding compound with a fragrance sustained-release function according to claim 6, characterized in that: The particle size of the porous quartz powder is 200-400 meshes; the particle size of the pre-treated flavoring agent mixture is 40-60 meshes.

9. The method for preparing a sheet molding compound with a fragrance sustained-release function according to claim 1, characterized in that: The specific steps include: S1. Pour unsaturated polyester resin, low shrinkage additive, polymerization inhibitor, diluent, viscosity reducer and dispersant into a stirring kettle in sequence, stir at 800-1200r / min for 3-5min, add aluminum hydroxide, calcium carbonate and internal release agent while stirring, stir for 3-5min, add pre-treated flavoring agent mixture particles while stirring, stir for 3-5min, add curing agent, heat to 38-42°C, and prepare resin paste: S2. Mix the resin paste with the glass fiber, and evenly apply it on the surface of the polypropylene film with a scraper, compound the coated polypropylene films, squeeze them with a compactor to form a sheet, and then roll them up to obtain a sheet molding compound with a sustained-release fragrance function; mature the sheet molding compound at 45-50°C for 24-32h, tear off the polypropylene films on the front and back of the sheet molding compound, put it into a preheated mold for molding, and after the molding is completed, take it out and trim it to obtain a sheet molding compound product with a continuous fragrance release.

10. The method for preparing a sheet molding compound with a fragrance sustained-release function according to claim 9, characterized in that: In the above step S2, the front temperature of the molding die is 140-150°C, the back temperature is 130-140°C, and the molding pressure is 80-100 Kgf / cm 2 , the holding time is 4~6min.

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