CN113583418B - Flame-retardant low-density sheet molding compound and preparation method thereof - Google Patents

Flame-retardant low-density sheet molding compound and preparation method thereof Download PDF

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CN113583418B
CN113583418B CN202110966881.2A CN202110966881A CN113583418B CN 113583418 B CN113583418 B CN 113583418B CN 202110966881 A CN202110966881 A CN 202110966881A CN 113583418 B CN113583418 B CN 113583418B
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molding compound
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resin
flame
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CN113583418A (en
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周立新
徐贵红
彭新龙
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Guangdong Baihuida New Material Co ltd
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    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L67/00—Compositions of polyesters obtained by reactions forming a carboxylic ester link in the main chain; Compositions of derivatives of such polymers
    • C08L67/06—Unsaturated polyesters
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J5/00—Manufacture of articles or shaped materials containing macromolecular substances
    • C08J5/18—Manufacture of films or sheets
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L51/00—Compositions of graft polymers in which the grafted component is obtained by reactions only involving carbon-to-carbon unsaturated bonds; Compositions of derivatives of such polymers
    • C08L51/04—Compositions of graft polymers in which the grafted component is obtained by reactions only involving carbon-to-carbon unsaturated bonds; Compositions of derivatives of such polymers grafted on to rubbers
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2351/00—Characterised by the use of graft polymers in which the grafted component is obtained by reactions only involving carbon-to-carbon unsaturated bonds; Derivatives of such polymers
    • C08J2351/04—Characterised by the use of graft polymers in which the grafted component is obtained by reactions only involving carbon-to-carbon unsaturated bonds; Derivatives of such polymers grafted on to rubbers
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2367/00—Characterised by the use of polyesters obtained by reactions forming a carboxylic ester link in the main chain; Derivatives of such polymers
    • C08J2367/06—Unsaturated polyesters
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2451/00—Characterised by the use of graft polymers in which the grafted component is obtained by reactions only involving carbon-to-carbon unsaturated bonds; Derivatives of such polymers
    • C08J2451/04—Characterised by the use of graft polymers in which the grafted component is obtained by reactions only involving carbon-to-carbon unsaturated bonds; Derivatives of such polymers grafted on to rubbers
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K3/00—Use of inorganic substances as compounding ingredients
    • C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
    • C08K3/20—Oxides; Hydroxides
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    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2201/00—Properties
    • C08L2201/02—Flame or fire retardant/resistant
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    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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    • Y02E60/10—Energy storage using batteries

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Abstract

The invention discloses a flame-retardant low-density sheet molding compound material, which comprises the following components in parts by weight: 50-65 parts of resin matrix, 35-50 parts of low shrinkage additive, 1.2 parts of initiator, 0.6 part of polymerization inhibitor, 1.5 parts of PE powder, 4 parts of release agent, 1 part of BYK auxiliary agent, 50-70 parts of aluminum hydroxide, 30-40 parts of organic filler, 5 parts of color paste, 3 parts of thickener and alkali-free glass fiber accounting for 33-36% of the total weight of all the components. The SMC material provided by the invention has lower density, higher strength and higher surface glossiness.

Description

Flame-retardant low-density sheet molding compound and preparation method thereof
Technical Field
The invention belongs to the field of molding compounds, and particularly relates to a flame-retardant low-density sheet molding compound and a preparation method thereof.
Background
The sheet molding compound, SMC (Sheet Molding Compounds), commonly called as unsaturated polyester resin sheet molding compound, is a product obtained by mixing unsaturated polyester resin, a thickener, an initiator, a release agent, a filler, color paste and the like into resin paste, impregnating chopped glass fiber yarns or glass chopped strand mats, coating both sides with polyethylene or polypropylene films to form a sandwich-type molding compound, and curing for a certain time. The SMC molding process is to mold in a closed mold under high temperature and high pressure conditions. Compared with other materials and molding processes, the SMC product has excellent mechanical property, electrical property, heat resistance and chemical corrosion resistance, and the product has stable size, short molding period and light weight, and can meet the flame retardant requirement, so the high-performance SMC composite material has great application value, especially on new energy battery covers.
The general SMC product mainly uses unsaturated polyester resin and polystyrene PS as a system of low-shrinkage additives, and the filler is generally inorganic filler or hollow glass beads are adopted to reduce the density, and the main advantages are good colorability, but the tensile strength is less than 50MPa and the bending strength is less than 120MPa; the SMC with the hollow glass beads is adopted, and the surface of a pressed product is poor in luster and not resistant to pollution due to the breakage of the hollow glass beads in the mould pressing process.
Disclosure of Invention
The invention aims at solving the technical problems and provides a flame-retardant low-density sheet molding compound with higher strength and lower density.
The invention also aims to provide a preparation method of the flame-retardant low-density sheet molding compound.
In order to achieve the above object, the present invention provides a flame retardant low density sheet molding compound comprising the following components by weight: 50-65 parts of resin matrix, 35-50 parts of low shrinkage additive, 1.2 parts of initiator, 0.6 part of polymerization inhibitor, 1.5 parts of PE powder, 4 parts of release agent, 1 part of BYK auxiliary agent, 50-70 parts of aluminum hydroxide, 30-40 parts of organic filler, 5 parts of color paste, 6 parts of thickener and alkali-free glass fiber accounting for 33% -36% of the total weight of all the components.
Preferably, the flame-retardant low-density sheet molding compound comprises the following components in weight: 60 parts of resin matrix, 40 parts of low shrinkage additive, 1.2 parts of initiator, 0.6 part of polymerization inhibitor, 1.5 parts of PE powder, 4 parts of release agent, 1 part of BYK auxiliary agent, 60 parts of aluminum hydroxide, 40 parts of organic filler, 5 parts of color paste, 6 parts of thickener and alkali-free glass fiber accounting for 35% of the total weight of all the components.
Preferably, the resin matrix is a high viscosity m-phenylene unsaturated polyester resin. More preferably, the resin matrix is an m-phenylene unsaturated polyester resin having a viscosity of 4500cp to 5000 cp.
Preferably, the low shrinkage additive is a polystyrene type low shrinkage additive, more preferably a high viscosity high impact polystyrene, most preferably the polystyrene type low shrinkage additive is an elongation at break of at least 0.63% and an impact toughness of at least 28.9KJ/m 2 Is a polystyrene of (3).
Preferably, the initiator is tert-butyl peroxybenzoate.
Preferably, the polymerization inhibitor is one or more of BHT (2, 6-di-tert-butyl-4-methylphenol), di-tert-butyl-p-cresol and benzoquinone.
Preferably, the aluminium hydroxide has an average particle size of from 5 to 10 microns.
Preferably, the organic filler is melamine.
Preferably, the thickener is a SMC molding universal thickener, preferably activated magnesium oxide RA-150, more preferably it is dispersed in the carrier resin at 35 wt% (based on the weight of the carrier resin).
On the other hand, the invention also provides a preparation method of the flame-retardant low-density sheet molding compound, which comprises the following steps:
1) Dispersing a resin matrix, a low-shrinkage additive, an initiator, a polymerization inhibitor, PE powder, a release agent, a BYK auxiliary agent and aluminum hydroxide into uniform resin paste;
2) Adding the organic filler into the resin paste, and uniformly mixing;
3) Introducing the resin paste, the color paste and the thickener which are well dispersed in the step 2) into sheet molding compound production equipment, and simultaneously adding glass fibers to ensure good impregnation of the glass fibers;
4) Curing to reach the set viscosity to obtain the flame-retardant low-density sheet molding compound.
The flame-retardant low-density sheet molding compound of the invention incorporates the organic filler melamine, since melamine has a lower density (1.66 g/cm 3 ) Simultaneously has a certain flame-retardant effect, and is suitable for melamine to replace part of inorganic filler aluminum hydroxide (2.4 g/cm) 3 ) The density of the product can be effectively reduced, and meanwhile, the melamine participates in the reaction during the mould pressing, so that the product has higher strength; the tensile strength is more than 80MPa, and the bending strength is more than 150MPa.
Detailed Description
The following description of the technical solutions in the embodiments of the present invention will be clear and complete, and it is obvious that the described embodiments are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Unless otherwise specified, the apparatus or reagents used in the examples are all conventional in the art and are commercially available. Unless otherwise indicated, all specific experimental operations referred to herein are understood or known by those skilled in the art according to common general knowledge or conventional technical means, and are not described in detail herein. For simplicity, some of the operations do not detail the parameters, steps, and instrumentation used for operation, it being understood that these are well known and reproducible by those skilled in the art.
The preparation method of the high elongation at break high impact polystyrene used in examples 1 to 4 below is as follows:
300g of styrene and 1g of a p-benzoquinone solution with the mass concentration of 10% are added into a 2L flask, 160g of Pasteur 2710PS particles and 40g of 158K PS particles are added while stirring, the temperature is controlled at 40-45 ℃, and stirring is carried out for 30min, so that the high-elongation at break and high-impact polystyrene with the following performances is finally obtained.
Figure BDA0003224262840000031
Example 1
The formula of the raw materials for manufacturing the flame-retardant low-density sheet molding compound is as follows:
60kg of general high viscosity (4500 cp-5000 cp) m-benzene type unsaturated polyester resin (product model 28803-1 from Zhaoqing Futian chemical industry Co., ltd.), 40kg of high-elongation-at-break high impact polystyrene, 1.2kg of initiator, 0.6kg of polymerization inhibitor BHT, 1.5kg of PE powder, 4kg of release agent, 1kg of BYK W972 auxiliary agent, 70kg of aluminum hydroxide, 30kg of melamine, 5kg of color paste, 6kg of thickener (active magnesium oxide RA-150, 35 wt% dispersed in carrier resin), 73.35kg of alkali-free glass fiber.
The preparation method of the flame-retardant low-density sheet molding compound comprises the following steps:
1. the preparation process of the resin paste comprises the following steps:
accurately weighing unsaturated polyester resin, a low-shrinkage additive, an initiator, a polymerization inhibitor and a BYK auxiliary agent, adding into a stirring tank, starting a stirrer, stirring for 8min at the rotating speed of 800 rpm; then adding PE powder and a release agent, and continuously stirring for 3min; adding aluminum hydroxide, stirring while feeding at 600 rpm, and stirring for 10min at 800 rpm; after the production is ready, adding melamine and uniformly mixing; obtaining resin paste; the viscosity of the test resin paste is in the range of 12000-15000cp (38 ℃), the test resin paste is transferred into a storage tank, and BYK auxiliary agent is used for adjusting the viscosity to be qualified when the viscosity is abnormal.
2. The coating process of the production line comprises the following steps:
measuring the flow of resin paste, thickener and color paste, and inputting the flow into a system according to a proportion; simultaneously adding alkali-free glass fiber; setting the front air pressure of the compactor to be in the range of 0.3-0.34MPa and the rear air pressure to be in the range of 0.35-0.38 MPa; during production, the amount of the resin paste in the resin paste tank accounts for 1/3-1/2 of the height, so that the unstable amount of the resin paste in unit area caused by height difference is avoided; the running speed of the equipment is 8/min.
3. Packaging and curing processes:
ripening temperature is 45 ℃; ripening time was 24 hours.
Example 2
The formula of the raw materials for manufacturing the flame-retardant low-density sheet molding compound is as follows:
50kg of general high viscosity (4500 cp-5000 cp) m-benzene type unsaturated polyester resin (product model 28803-1 from Zhaoqing Futian chemical industry Co., ltd.), 50kg of high-elongation-at-break high impact polystyrene, 1.2kg of initiator, 0.6kg of polymerization inhibitor BHT, 1.5kg of PE powder, 4kg of release agent, 1kg of BYK W972 auxiliary agent, 65kg of aluminum hydroxide, 35kg of melamine, 5kg of color paste, 6kg of thickener (active magnesium oxide RA-150, 35 wt% dispersed in carrier resin), 78.35kg of alkali-free glass fiber.
The preparation method of the flame-retardant low-density sheet molding compound comprises the following steps:
1. the preparation process of the resin paste comprises the following steps:
accurately weighing high-viscosity m-benzene resin, a low-shrinkage additive, an initiator, a polymerization inhibitor and a BYK auxiliary agent, adding into a stirring tank, starting a stirrer, stirring for 8min at the rotating speed of 800 rpm; then adding PE powder and a release agent, and continuously stirring for 3min; adding aluminum hydroxide, stirring while feeding at 600 rpm, and stirring for 10min at 800 rpm; after the production is ready, adding melamine and uniformly mixing; obtaining resin paste; the viscosity of the test resin paste is in the range of 12000-15000cp (38 ℃), the test resin paste is transferred into a storage tank, and BYK auxiliary agent is used for adjusting the viscosity to be qualified when the viscosity is abnormal.
2. The coating process of the production line comprises the following steps:
measuring the flow of resin paste, thickener and color paste, and inputting the flow into a system according to a proportion; simultaneously adding alkali-free glass fiber; setting the front air pressure of the compactor to be in the range of 0.3-0.34MPa and the rear air pressure to be in the range of 0.35-0.38 MPa; during production, the amount of the resin paste in the resin paste tank accounts for 1/3-1/2 of the height, so that the unstable amount of the resin paste in unit area caused by height difference is avoided; the running speed of the equipment is 12m/min.
3. Packaging and ripening process
Ripening temperature is 45 ℃; ripening time was 48 hours.
Example 3
The formula of the raw materials for manufacturing the flame-retardant low-density sheet molding compound is as follows:
60kg of general high viscosity (4500 cp-5000 cp) m-benzene type unsaturated polyester resin (product model 28803-1 from Zhaoqing Futian chemical industry Co., ltd.), 40kg of high elongation at break high impact polystyrene, 1.2kg of initiator, 0.6kg of benzoquinone, 1.5kg of PE powder, 4kg of release agent, 1kg of BYK W972 auxiliary agent, 60kg of aluminum hydroxide, 40kg of melamine, 5kg of color paste, 6kg of thickener (active magnesium oxide RA-150, 35 wt% dispersed in carrier resin), 75.78kg of alkali-free glass fiber.
The preparation method of the flame-retardant low-density sheet molding compound comprises the following steps:
1. the preparation process of the resin paste comprises the following steps:
accurately weighing high-viscosity m-benzene resin, a low-shrinkage additive, an initiator, a polymerization inhibitor and a BYK auxiliary agent, adding into a stirring tank, starting a stirrer, stirring for 8min at the rotating speed of 800 rpm; then adding PE powder and a release agent, and continuously stirring for 3min; adding aluminum hydroxide, stirring while feeding at 600 rpm, and stirring for 10min at 800 rpm; after the production is ready, adding melamine and uniformly mixing; obtaining resin paste; the viscosity of the test resin paste is in the range of 12000-15000cp (38 ℃), the test resin paste is transferred into a storage tank, and BYK auxiliary agent is used for adjusting the viscosity to be qualified when the viscosity is abnormal.
2. The coating process of the production line comprises the following steps:
measuring the flow of resin paste, thickener and color paste, and inputting the flow into a system according to a proportion; simultaneously adding alkali-free glass fiber; setting the front air pressure of the compactor to be in the range of 0.3-0.34MPa and the rear air pressure to be in the range of 0.35-0.38 MPa; during production, the amount of the resin paste in the resin paste tank accounts for 1/3-1/2 of the height, so that the unstable amount of the resin paste in unit area caused by height difference is avoided; the running speed of the equipment is 10m/min.
3. Packaging and ripening process
Curing temperature is 48 ℃; ripening time was 24 hours.
Example 4
The formula of the raw materials for manufacturing the flame-retardant low-density sheet molding compound is as follows:
65kg of general high viscosity (4500 cp-5000 cp) m-benzene type unsaturated polyester resin (available from Zhaoqing Futian chemical industry Co., ltd., product model 28803-1), 35kg of high-elongation at break high-impact polystyrene, 1.2kg of initiator, 0.6kg of di-tert-butyl-p-cresol, 1.5kg of PE powder, 4kg of release agent, 1kg of BYK W972 auxiliary agent, 50kg of aluminum hydroxide (average particle size 5-10 microns), 40kg of melamine, 5kg of color paste, 6kg of thickener (active magnesium oxide RA-150), and 69.80kg of alkali-free glass fiber.
The preparation method of the SMC for the battery cover of the new energy automobile comprises the following steps:
1. the preparation process of the resin paste comprises the following steps:
accurately weighing m-benzene type unsaturated polyester resin, a low-shrinkage additive, an initiator, a polymerization inhibitor and a BYK auxiliary agent, adding into a stirring tank, starting a stirrer, stirring for 8min at the rotating speed of 800 rpm; then adding PE powder and a release agent, and continuously stirring for 3min; adding aluminum hydroxide, stirring while feeding at 600 rpm, and stirring for 10min at 800 rpm; after the production is ready, adding melamine and uniformly mixing; obtaining resin paste; testing the viscosity of the resin paste to be in the range of 12000-15000cp (38 ℃), transferring into a storage tank, and adjusting the viscosity to be qualified by using a BYK auxiliary agent when the viscosity is abnormal;
2. the coating process of the production line comprises the following steps:
measuring the flow of resin paste, thickener and color paste, and inputting the flow into a system according to a proportion; simultaneously adding alkali-free glass fiber; setting the front air pressure of the compactor to be in the range of 0.3-0.34MPa and the rear air pressure to be in the range of 0.35-0.38 MPa; during production, the amount of the resin paste in the resin paste tank accounts for 1/3-1/2 of the height, so that the unstable amount of the resin paste in unit area caused by height difference is avoided; the running speed of the equipment is 10m/min.
3. Packaging and ripening process
Curing temperature is 48 ℃; ripening time was 24 hours.
Comparative example 1
The formula of the raw materials for manufacturing the flame-retardant low-density sheet molding compound is as follows:
65kg of general-purpose m-phenylene unsaturated polyester resin (available from Zhaoqing Fufield chemical industry Co., ltd., product model 28803), 35kg of a low shrinkage additive (35% polystyrene PS-1), 1.2kg of an initiator, 0.6kg of di-t-butyl-p-cresol, 1.5kg of PE powder, 4kg of a mold release agent, 1kg of BYKW972 auxiliary agent, 130kg of aluminum hydroxide (average particle size 5-10 μm), 2kg of hollow glass beads, 5kg of color paste, 6kg of a thickener (activated magnesium oxide RA-150), and 69.80kg of alkali-free glass fiber.
The preparation method of the flame-retardant low-density sheet molding compound comprises the following steps:
1. the preparation process of the resin paste comprises the following steps:
accurately weighing m-benzene type unsaturated polyester resin, a low-shrinkage additive, an initiator, a polymerization inhibitor and a BYK W972 auxiliary agent, adding into a stirring tank, starting a stirrer, stirring for 8min at the rotating speed of 800 rpm; then adding PE powder, a release agent and hollow glass beads, and continuously stirring for 3min; adding aluminum hydroxide, stirring while feeding at 600 rpm, and stirring for 10min at 800 rpm; the viscosity of the test resin paste is in the range of 12000-15000cp (38 ℃), the test resin paste is transferred into a storage tank, and BYK auxiliary agent is used for adjusting the viscosity to be qualified when the viscosity is abnormal.
2. The coating process of the production line comprises the following steps:
measuring the flow of resin paste, thickener and color paste, and inputting the flow into a system according to a proportion; simultaneously adding alkali-free glass fiber; setting the front air pressure of the compactor to be in the range of 0.3-0.34MPa and the rear air pressure to be in the range of 0.35-0.38 MPa; during production, the amount of the resin paste in the resin paste tank accounts for 1/3-1/2 of the height, so that the unstable amount of the resin paste in unit area caused by height difference is avoided; the running speed of the equipment is 10m/min.
3. Packaging and ripening process
Curing temperature is 48 ℃; ripening time was 24 hours.
Comparative example 2
The formula of the raw materials for manufacturing the flame-retardant low-density sheet molding compound is as follows:
65kg of general high viscosity (4500 cp-5000 cp) m-benzene type unsaturated polyester resin (available from Zhaoqing Futian chemical industry Co., ltd., product model 28803-1), 35kg of high-elongation at break high-impact polystyrene, 1.2kg of initiator, 0.6kg of di-tert-butyl-p-cresol, 1.5kg of PE powder, 4kg of release agent, 1kg of BYK W972 auxiliary agent, 60kg of aluminum hydroxide (average particle size 5-10 microns), 20kg of melamine, 5kg of color paste, 6kg of thickener (active magnesium oxide RA-150), and 69.80kg of alkali-free glass fiber.
The preparation method of the flame-retardant low-density sheet molding compound comprises the following steps:
1. the preparation process of the resin paste comprises the following steps:
accurately weighing m-benzene type unsaturated polyester resin, a low-shrinkage additive, an initiator, a polymerization inhibitor and a BYK W972 auxiliary agent, adding into a stirring tank, starting a stirrer, stirring for 8min at the rotating speed of 800 rpm; then adding PE powder and a release agent, and continuously stirring for 3min; adding aluminum hydroxide, stirring while feeding at 600 rpm, and stirring for 10min at 800 rpm; after the production is ready, adding melamine and uniformly mixing; obtaining resin paste; the viscosity of the test resin paste is in the range of 12000-15000cp (38 ℃), the test resin paste is transferred into a storage tank, and BYK auxiliary agent is used for adjusting the viscosity to be qualified when the viscosity is abnormal.
2. The coating process of the production line comprises the following steps:
measuring the flow of resin paste, thickener and color paste, and inputting the flow into a system according to a proportion; simultaneously adding alkali-free glass fiber; setting the front air pressure of the compactor to be in the range of 0.3-0.34MPa and the rear air pressure to be in the range of 0.35-0.38 MPa; during production, the amount of the resin paste in the resin paste tank accounts for 1/3-1/2 of the height, so that the unstable amount of the resin paste in unit area caused by height difference is avoided; the running speed of the equipment is 10m/min.
3. Packaging and ripening process
Curing temperature is 48 ℃; ripening time was 24 hours.
Comparative example 3
The formula of the raw materials for manufacturing the flame-retardant low-density sheet molding compound is as follows:
65kg of general high viscosity (4500 cp-5000 cp) m-benzene type unsaturated polyester resin (available from Zhaoqing Futian chemical industry Co., ltd., product model 28803-1), 35kg of high-elongation at break high-impact polystyrene, 1.2kg of initiator, 0.6kg of di-tert-butyl-p-cresol, 1.5kg of PE powder, 4kg of release agent, 1kg of BYK W972 auxiliary agent, 30kg of aluminum hydroxide (average particle size 5-10 microns), 50kg of melamine, 5kg of color paste, 6kg of thickener (active magnesium oxide RA-150), 69.80kg of alkali-free glass fiber.
The preparation method of the flame-retardant low-density sheet molding compound comprises the following steps:
1. the preparation process of the resin paste comprises the following steps:
accurately weighing m-benzene type unsaturated polyester resin, a low-shrinkage additive, an initiator, a polymerization inhibitor and a BYK W972 auxiliary agent, adding into a stirring tank, starting a stirrer, stirring for 8min at the rotating speed of 800 rpm; then adding PE powder and a release agent, and continuously stirring for 3min; adding aluminum hydroxide, stirring while feeding at 600 rpm, and stirring for 10min at 800 rpm; after the production is ready, adding melamine and uniformly mixing; obtaining resin paste; the viscosity of the test resin paste is in the range of 12000-15000cp (38 ℃), the test resin paste is transferred into a storage tank, and BYK auxiliary agent is used for adjusting the viscosity to be qualified when the viscosity is abnormal.
2. The coating process of the production line comprises the following steps:
measuring the flow of resin paste, thickener and color paste, and inputting the flow into a system according to a proportion; simultaneously adding alkali-free glass fiber; setting the front air pressure of the compactor to be in the range of 0.3-0.34MPa and the rear air pressure to be in the range of 0.35-0.38 MPa; during production, the amount of the resin paste in the resin paste tank accounts for 1/3-1/2 of the height, so that the unstable amount of the resin paste in unit area caused by height difference is avoided; the running speed of the equipment is 10m/min.
3. Packaging and ripening process
Curing temperature is 48 ℃; ripening time was 24 hours.
SMC Performance test
The SMCs of examples 1-4 and comparative examples 1-3 were tested for performance according to the general industry standard and the test results are shown in Table 1.
Table 1: SMC Performance test results
Figure BDA0003224262840000081
As can be seen from the test results, compared with the existing products, the products in examples 1-4 of the invention adopt proper melamine to replace aluminum hydroxide, the products have lower density and proper glass fiber content, the component formula proportion is more reasonable, the SMC finished product has lower density, surface gloss and higher strength, the comparative example 2 added with 20 parts of melamine has higher density and lower impact strength, the comparative example 3 added with 50 parts of melamine has higher viscosity of resin paste, poor impregnation of SMC glass fiber and lower modulus and surface gloss.

Claims (3)

1. The flame-retardant low-density sheet molding compound is characterized by comprising the following components in parts by weight: 50-65 parts of resin matrix, 35-50 parts of low shrinkage additive, 1.2 parts of initiator, 0.6 part of polymerization inhibitor, 1.5 parts of PE powder, 4 parts of release agent, 1 part of BYK auxiliary agent, 50-70 parts of aluminum hydroxide, 30-40 parts of organic filler, 5 parts of color paste, 6 parts of thickener and alkali-free glass fiber accounting for 33% -36% of the total weight of all the components;
the resin matrix is m-benzene unsaturated polyester resin with the viscosity of 4500-5000 cp;
the low shrinkage additive is a polystyrene type low shrinkage additive, and the polystyrene type low shrinkage additive is polystyrene with an elongation at break of at least 0.63 percent and an impact toughness of at least 28.9KJ/m 2;
the initiator is tert-butyl peroxybenzoate;
the polymerization inhibitor is one or more of BHT, di-tert-butyl-p-cresol and benzoquinone;
the average particle size of the aluminum hydroxide is 5-10 microns;
the organic filler is melamine.
2. The flame retardant low density sheet molding compound of claim 1, consisting of the following components by weight: 60 parts of resin matrix, 40 parts of low shrinkage additive, 1.2 parts of initiator, 0.6 part of polymerization inhibitor, 1.5 parts of PE powder, 4 parts of release agent, 1 part of BYK auxiliary agent, 60 parts of aluminum hydroxide, 40 parts of organic filler, 5 parts of color paste, 6 parts of thickener and alkali-free glass fiber accounting for 35% of the total weight of all the components.
3. A method for preparing the flame retardant low density sheet molding compound according to claim 1 or 2, characterized by comprising the steps of:
1) Dispersing a resin matrix, a low-shrinkage additive, an initiator, a polymerization inhibitor, PE powder, a release agent, a BYK auxiliary agent and aluminum hydroxide into uniform resin paste;
2) Adding the organic filler into the resin paste, and uniformly dispersing;
3) Introducing the resin paste, color paste and thickener which are dispersed in the step 2) into sheet molding compound production equipment, and simultaneously adding glass fibers to ensure good impregnation of the glass fibers;
4) Curing to obtain the flame-retardant low-density sheet molding compound with the viscosity of 12000-15000cp at 38 ℃.
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