CN109438950A - A kind of thermosetting property sheet molding compound and preparation method thereof - Google Patents
A kind of thermosetting property sheet molding compound and preparation method thereof Download PDFInfo
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- C08L67/00—Compositions of polyesters obtained by reactions forming a carboxylic ester link in the main chain; Compositions of derivatives of such polymers
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Abstract
The invention discloses a kind of thermosetting property sheet molding compounds and preparation method thereof.A kind of thermosetting property sheet molding compound of the invention, by weight, the low shrinkage additive comprising 60~70 parts of unsaturated polyester resins and 30~40 parts, wherein the unsaturated polyester resin and the low shrinkage additive are free of styrene.Preparation method of the invention is simple, thermosetting property sheet molding compound obtained, does not contain styrene, avoids influence of the volatilization of styrene to human body and environment, has good shrinking percentage, impact strength and electrical strength.
Description
Technical field
The present invention relates to moulding compound technical field, it is related to a kind of sheet molding compound and preparation method thereof, and in particular to a kind of
The thermosetting property sheet molding compound and its preparation side of thermosetting property sheet molding compound and preparation method thereof more particularly to a kind of no styrene
Method.
Background technique
Moulding compound is a seed type of plastics, and compared with common thermoplastic, moulding compound has higher dimensioning
Very little stability, more resistant to extreme high heat and humidity complex environment, chemicals-resistant burn into high mechanical strength the features such as.Sheet molding compound
(abbreviation of SMC, Sheet molding compound), SMC primarily occur ins Europe in earlier 1960s,
Or so nineteen sixty-five, U.S. have developed this technique day in succession.China the end of the eighties, introduced external advanced SMC production line and
Production technology.SMC has the advantages that superior electric property, corrosion resistance, light and engineering design is easy, is flexible, machine
Tool performance can compare favourably with part metals material, thus be widely used in the industries such as haulage vehicle, building, electronic/electrical gas.
Be used to prepare SMC raw material have resin, curing agent, filler, thickener, release agent, mill base and shrinking agent with
And fibre reinforced materials etc..Common resin material is unsaturated polyester resin, vinyl ester resins and phenolic resin.In fiber
In the unsaturated polyester die plastic of enhancing, usually use styrene as cross-linking monomer, styrene has the good, reactivity of dilution property
The advantages that high, cheap, but styrene be it is toxic, for a long time, a large amount of sucking styrene gas can cause headache and dizzy, eat
Be intended to decline, inability, red blood cell and blood platelet reduce, high concentration has stronger stimulation to mucous membrane.Styrene has simultaneously
The characteristics of vapour pressure height, high volatility, influence not only is caused on construction personnel, polluted environment, also has lost material (resin
Styrene in component).From environmental protection, it is economical from the perspective of, inhibit styrene volatilization be it is very urgent, especially in mesh
Preceding country, society generally propose environmental protection under the background of requirements at the higher level, this just needs to develop the material that can replace styrene
Unsaturated polyester (UP) thermosetting property sheet molding compound is prepared, to avoid styrene from volatilizing the influence caused by human body and environment.
CN101237978A discloses a kind of paste formulation of sheet molding compound, it includes: thermosetting resin；Ethylenic bond is not
It is saturated monomer；Activated monomer；Low shrinkage additive；And nanoclay filler composition, wherein the density of the SMC paste is below about
1.25g/cm3.Sheet molding compound includes organic-modified inorganic clay, thermosetting resin, low shrinkage additive, reinforcing agent, low
Density fillers, but not calcium carbonate.The SMC sheet of the invention has good mechanical performance on the basis of not increasing paste viscosity
With basic toughness.Wherein, sheet molding compound (SMC) has with optional existing for aromatics, multi-ethylenical unsaturated compound
Activated monomer；The aromatic kernel of monomer can arbitrarily be benzene, toluene, naphthalene, anthracene or more advanced aromatic compounds or its any mixture；
Ethylenic bond unsaturation can be two-, three, four-and/or higher functionality, wherein preferred ethylenically unsaturated monomers are
Styrene prepares and also contains styrene in raw material.
CN101213245A discloses a kind of Synergistic filler compositions and its low density sheet molding compounds therefrom, wherein sheet mould
Plastic paste (SMC- paste) formulation includes: thermosetting resin；Ethylenically unsaturated monomers；Low shrinkage additive；And nanoclay
Filler composition；Wherein SMC- paste density is lower than 1.25g/cm3.The low-density SMC with A grades of SQ of the invention, i.e.,
It is able to maintain mechanical performance and matrix solidity and does not increase paste viscosity to the range for being higher than SMC sheet preparation requirement.But it is described
Ethylenically unsaturated monomers be selected from acrylate, methacrylate, methyl methacrylate, 2- ethylhexyl acrylic acid
Ester, styrene, divinylbenzene and substituted phenylethylene, polyfunctional acrylic ester, ethylene glycol dimethacrylate, trihydroxy methyl
Propane triacrylate and their mixture.Intercalation-facilitating agent in nanoclay filler composition is styrene,
It prepares and equally contains a large amount of styrene in raw material.
Summary of the invention
In view of the deficiencies of the prior art, the purpose of the present invention is to provide a kind of thermosetting property sheet molding compound and its preparation sides
Method, thermosetting property sheet molding compound of the invention do not contain styrene, avoid shadow of the volatilization to human body and environment of styrene
It rings, there is good shrinking percentage, impact strength and electrical strength.
To achieve this purpose, the present invention adopts the following technical scheme:
A kind of thermosetting property sheet molding compound includes 60~70 parts of unsaturated polyester resins and 30~40 by weight
The low shrinkage additive of part, wherein the unsaturated polyester resin and the low shrinkage additive are free of styrene.
It is raw material that the present invention, which selects the unsaturated polyester resin without styrene, the low shrinkage additive without styrene,
By adjusting the proportion of raw material, the thermosetting property sheet molding compound being prepared into avoids the volatilization of styrene to human body and environment
It influences, there is good shrinking percentage, impact strength and electrical strength.
In the present invention, a kind of thermosetting property sheet molding compound includes by weight following components:
60~70 parts of unsaturated polyester resin, such as the parts by weight of unsaturated polyester resin are 60 parts, 61 parts, 62 parts, 63
Part, 64 parts, 65 parts, 66 parts, 67 parts, 68 parts, 69 parts, 70 parts.
30~40 parts of low shrinkage additive, such as the parts by weight of low shrinkage additive are 30 parts, 31 parts, 32 parts, 33 parts, 34
Part, 35 parts, 36 parts, 37 parts, 38 parts, 39 parts, 40 parts.
90~110 parts of inorganic filler powder, for example, inorganic filler powder parts by weight be 90 parts, 91 parts, 92 parts, 93 parts,
94 parts, 95 parts, 96 parts, 97 parts, 98 parts, 99 parts, 100 parts, 101 parts, 102 parts, 103 parts, 104 parts, 105 parts, 106 parts, 107
Part, 108 parts, 109 parts, 110 parts.
70~80 parts of glass fibre, for example, glass fibre parts by weight be 70 parts, 71 parts, 72 parts, 73 parts, 74 parts, 75 parts,
76 parts, 77 parts, 78 parts, 79 parts, 80 parts.
1~1.5 part of initiator, such as the parts by weight of initiator are 1 part, 1.1 parts, 1.2 parts, 1.3 parts, 1.4 parts, 1.5 parts.
3~4 parts of release agent, for example, release agent parts by weight be 3 parts, 3.1 parts, 3.2 parts, 3.3 parts, 3.4 parts, 3.5 parts,
3.6 parts, 3.7 parts, 3.8 parts, 3.9 parts, 4 parts.
0.5~1 part of thickener, such as the parts by weight of thickener are 0.5 part, 0.6 part, 0.7 part, 0.8 part, 0.9 part, 1 part.
3~8 parts of auxiliary agent, such as the parts by weight of auxiliary agent are 3 parts, 4 parts, 5 parts, 6 parts, 7 parts, 8 parts；
Wherein, the unsaturated polyester resin and the low shrinkage additive are free of styrene.
In the present invention, the unsaturated polyester resin is to use cycloaliphatic acrylates as the unsaturated polyester (UP) tree of diluent
Rouge.And the unsaturated polyester resin of routine uses styrene as diluent in the prior art.
In the present invention, the low shrinkage additive is the methyl methacrylate solution containing polystyrene.
Preferably, in the low shrinkage additive, the mass fraction of polystyrene is 30~50%, such as polystyrene
Mass fraction is 30%, 35%, 40%, 45%, 50%.Polystyrene is dissolved in methyl methacrylate, solution, low receipts are made
Contracting additive can make the dispersion of powdered polystyrene more preferably more evenly wherein when mixing with unsaturated polyester resin；Also,
If the content of polystyrene is too low, it is lower than 30%, the shrinking percentage of material obtained can be made too big, if the content of polystyrene
It is too high, it is higher than 50%, the impact strength decreased of material obtained can be made.
In the present invention, the inorganic filler powder is calcium carbonate powder or aluminium-hydroxide powder.
In the present invention, the initiator is peroxidized t-butyl perbenzoate.
Preferably, the purity of the peroxidized t-butyl perbenzoate is 98% or more, the peroxidized t-butyl perbenzoate
Half-life period at 104 DEG C is 10 hours.
In the present invention, the release agent is zinc stearate powder；Preferably, the partial size of the zinc stearate powder is 100
~300 mesh, such as the partial size of zinc stearate powder is 100 mesh, 150 mesh, 200 mesh, 250 mesh, 300 mesh.
In the present invention, the thickener is magnesia paste；Preferably, the auxiliary agent is size；Preferably, the infiltration
Agent is butyl acrylate-acrylic acid copolymer.
In the present invention, the glass fibre is alkali-free glass fibre.
The second object of the present invention is to provide a kind of preparation method of thermosetting property sheet molding compound described in the first purpose,
The preparation method comprises the following steps:
1) by weight, 30~70 parts of unsaturated polyester resins, 30~40 parts of low shrinkage additives, 1~1.5 part are drawn
It is stirred evenly after hair agent and 3~8 parts of auxiliary agent mixing；
2) 3~4 parts of release agents by weight, are added in the mixture that step 1) obtains and 90~110 parts inorganic are filled out
Feed powder end, stirs evenly after mixing；
3) 0.5~1 part of thickener by weight, is added in the mixture that step 2) obtains, obtains after mixing evenly
Resin paste；
4) by weight, 70~80 parts of glass fibres are fallen in the resin paste that step 3) obtains, obtain the heat
Solidity sheet molding compound.
In step 1), the low shrinkage additive is obtained by the following method: methyl is added in Polystyrene powder
In methyl acrylate, after stirring 20~40min under the revolving speed of 400~300r/min with high speed disperser, it is put into 23~27 DEG C
In the environment of stand 20~25h, be prepared into polystyrene mass fraction be 30~50% low shrinkage additive；
Preferably, in step 1), the stirring is carried out in high speed disperser, the speed of the stirring is 700~
900r/min, the time of the stirring are 3~5min；
Preferably, in step 2), the time of the stirring is 20~30min；
Preferably, in step 3), the speed of the stirring is 900~1100r/min, the time of the stirring is 1~
2min；
Preferably, the detailed process of step 4) is that the resin paste for obtaining step 3) is transported to SMC machine group and scrapes in hopper,
Start compounding machine, lower films are uniformly coated certain thickness resin paste, glass fibre be cut into length 20~
It is equably settled down in the resin paste after 30mm, then so that resin paste is impregnated with glass fibre by crawler belt extruding.
As a preferred solution of the present invention, the thermosetting property sheet molding compound preparation method the following steps are included:
1) Polystyrene powder is added in methyl methacrylate, with high speed disperser turning in 400~300r/min
After 20~40min of the lower stirring of speed, 20~25h is stood in the environment of being put into 23~27 DEG C, being prepared into polystyrene mass fraction is
30~50% low shrinkage additive；By weight, by 30~70 parts of unsaturated polyester resins, 30~40 parts of lower shrinkage additions
Agent, 1~1.5 part of initiator and 3~8 parts of auxiliary agents are poured into agitator and are mixed, with the speed of 700~900r/min of high speed disperser
3~5min is stirred to uniform；
2) 3~4 parts of release agents and 90~110 by weight, are added while stirring in the mixture that step 1) obtains
Part inorganic filler powder stirs 20~30min to uniform after mixing；
3) 0.5~1 part of thickener is added, in the mixture that step 2) obtains by weight, with 900~1100r/
The speed of min obtains resin paste after stirring 1~2min；
4) resin paste that by weight, step 3) is obtained is transported to SMC machine group and scrapes in hopper, starts compounding machine, on
Lower film is uniformly coated certain thickness resin paste, and 70~80 parts of glass fibre is cut into 20~30mm of length
It is equably settled down in the resin paste afterwards, then so that resin paste is impregnated with glass fibre by crawler belt extruding, obtain the thermosetting
Property sheet molding compound.
Compared with prior art, the invention has the benefit that
Thermosetting property sheet molding compound of the invention is selected and is free of the unsaturated polyester resin of styrene, without styrene
Low shrinkage additive is raw material, and by adjusting the proportion of raw material, the thermosetting property sheet molding compound being prepared into avoids styrene
The influence volatilized to human body and environment has good shrinking percentage, impact strength and electrical strength, wherein thermosetting property sheet mould
The shrinking percentage of plastics is 0.08~0.089%, and impact strength is 54.2~65.3kJ/m2, electrical strength is 20.2~20.9kV/
mm。
Specific embodiment
The technical scheme of the invention is further explained by means of specific implementation.
The preparation method of thermosetting property sheet molding compound of the invention, comprising the following steps:
1) by weight, 30~70 parts of unsaturated polyester resins, 30~40 parts of low shrinkage additives, 1~1.5 part are drawn
It is stirred evenly after hair agent and 3~8 parts of auxiliary agent mixing；
2) 3~4 parts of release agents and 90~110 parts of calcium carbonate by weight, are added in the mixture that step 1) obtains
Powder stirs evenly after mixing；
3) 0.5~1 part of thickener by weight, is added in the mixture that step 2) obtains, obtains after mixing evenly
Resin paste；
4) by weight, 70~80 parts of glass fibres are fallen in the resin paste that step 3) obtains, obtain the heat
Solidity sheet molding compound.
In the present invention, the test method of thermosetting property sheet molding compound performance is as follows:
According to ISO 2577-2007 " measurement of plastics/thermoset molding material shrinkage " to thermosetting property sheet molding compound
Carry out molding shrinkage performance test.
According to GB/T 1043.1-2008 " the measurement part 1 of plastics Charpy Impact performance: non-instrumentization impact examination
Test " impact resistant strength test is carried out to thermosetting property sheet molding compound.
According to GB/T 1408.1-2003 " being tested under insulating materials electrical strength test method part 1 power frequency " to thermosetting
Property sheet molding compound carry out electrical strength performance test.
Embodiment 1
The thermosetting property sheet molding compound of the present embodiment includes by weight 60 parts of unsaturated polyester resin, lower shrinkage adds
Add 40 parts of agent, 90 parts of calcium carbonate powder, 1.0 parts of peroxidized t-butyl perbenzoate, 3 parts of release agent, magnesia paste 1 part, acrylic acid
8 parts of butyl ester-acrylic copolymer, 70 parts of alkali-free glass fibre.Wherein, low shrinkage additive is the methyl-prop containing polystyrene
E pioic acid methyl ester solution, the mass fraction of polystyrene are 30%, and release agent is the zinc stearate powder that partial size is 100 mesh.
The thermosetting property sheet molding compound of the present embodiment the preparation method is as follows:
1) Polystyrene powder is added in methyl methacrylate, is stirred under the revolving speed of 400r/min with high speed disperser
After mixing 40min, 25h is stood in the environment of being put into 23 DEG C, is prepared into the low shrinkage additive that polystyrene mass fraction is 30%；
By said ratio, unsaturated polyester resin, low shrinkage additive, initiator and auxiliary agent are poured into agitator and mixed, with high speed
The speed of dispersion machine 700r/min stirs 5min to uniform；
2) by as above proportion, release agent and calcium carbonate powder are added while stirring in the mixture that step 1) obtains, mixes
20min is stirred after conjunction to uniform；
3) by as above proportion, thickener is added in the mixture that step 2) obtains, is stirred with the speed of 900r/min
Resin paste is obtained after 2min；
4) it is transported to SMC machine group by as above proportion, the resin paste that step 3) is obtained and is scraped in hopper, start compounding machine, on
Lower film is uniformly coated certain thickness resin paste, is equably settled down to after glass fibre is cut into length 20mm
In the resin paste, then so that resin paste is impregnated with glass fibre by crawler belt extruding, obtain the thermosetting property sheet molding compound.
After tested, the shrinking percentage of thermosetting property sheet molding compound is 0.080%, impact strength 58.3kJ/m2, electrical strength
For 20.2kV/mm.
Embodiment 2
The thermosetting property sheet molding compound of the present embodiment includes by weight 65 parts of unsaturated polyester resin, lower shrinkage adds
Adding 35 parts of agent, 100 parts of calcium carbonate powder, 1.2 parts of peroxidized t-butyl perbenzoate, 3.5 parts of release agent, magnesia paste 0.8 part, and third
Olefin(e) acid butyl ester -7 parts of acrylic copolymer, 75 parts of alkali-free glass fibre.Wherein, low shrinkage additive is the first containing polystyrene
Base methyl acrylate solution, the mass fraction of polystyrene are 40%, and release agent is the zinc stearate powder that partial size is 200 mesh.
The thermosetting property sheet molding compound of the present embodiment the preparation method is as follows:
1) Polystyrene powder is added in methyl methacrylate, is stirred under the revolving speed of 500r/min with high speed disperser
After mixing 30min, 20h is stood in the environment of being put into 25 DEG C, is prepared into the low shrinkage additive that polystyrene mass fraction is 40%；
By said ratio, unsaturated polyester resin, low shrinkage additive, initiator and auxiliary agent are poured into agitator and mixed, with high speed
The speed of dispersion machine 800r/min stirs 4min to uniform；
2) by as above proportion, release agent and calcium carbonate powder are added while stirring in the mixture that step 1) obtains, mixes
30min is stirred after conjunction to uniform；
3) by as above proportion, thickener is added in the mixture that step 2) obtains, is stirred with the speed of 1000r/min
Resin paste is obtained after 1.5min；
4) it is transported to SMC machine group by as above proportion, the resin paste that step 3) is obtained and is scraped in hopper, start compounding machine, on
Lower film is uniformly coated certain thickness resin paste, is equably settled down to after glass fibre is cut into length 25mm
In the resin paste, then so that resin paste is impregnated with glass fibre by crawler belt extruding, obtain the thermosetting property sheet molding compound.
After tested, the shrinking percentage of thermosetting property sheet molding compound is 0.085%, impact strength 60.5kJ/m2, electrical strength
For 20.8kV/mm.
Embodiment 3
The thermosetting property sheet molding compound of the present embodiment includes by weight 70 parts of unsaturated polyester resin, lower shrinkage adds
Add 30 parts of agent, 110 parts of calcium carbonate powder, 1.5 parts of peroxidized t-butyl perbenzoate, 4 parts of release agent, magnesia paste 0.5 part, propylene
8 parts of acid butyl ester-acrylic copolymer, 80 parts of alkali-free glass fibre.Wherein, low shrinkage additive is the methyl containing polystyrene
Methyl acrylate solution, the mass fraction of polystyrene are 50%, and release agent is the zinc stearate powder that partial size is 300 mesh.
The thermosetting property sheet molding compound of the present embodiment the preparation method is as follows:
1) Polystyrene powder is added in methyl methacrylate, is stirred under the revolving speed of 600r/min with high speed disperser
After mixing 20min, 20h is stood in the environment of being put into 27 DEG C, is prepared into the low shrinkage additive that polystyrene mass fraction is 50%；
By said ratio, unsaturated polyester resin, low shrinkage additive, initiator and auxiliary agent are poured into agitator and mixed, with high speed
The speed of dispersion machine 850r/min stirs 4min to uniform；
2) by as above proportion, release agent and calcium carbonate powder are added while stirring in the mixture that step 1) obtains, mixes
26min is stirred after conjunction to uniform；
3) by as above proportion, thickener is added in the mixture that step 2) obtains, is stirred with the speed of 1050r/min
Resin paste is obtained after 1.5min；
4) it is transported to SMC machine group by as above proportion, the resin paste that step 3) is obtained and is scraped in hopper, start compounding machine, on
Lower film is uniformly coated certain thickness resin paste, is equably settled down to after glass fibre is cut into length 30mm
In the resin paste, then so that resin paste is impregnated with glass fibre by crawler belt extruding, obtain the thermosetting property sheet molding compound.
After tested, the shrinking percentage of thermosetting property sheet molding compound is 0.085%, impact strength 65.3kJ/m2, electrical strength
For 20.9kV/mm.
Embodiment 4
The thermosetting property sheet molding compound of the present embodiment includes by weight 66 parts of unsaturated polyester resin, lower shrinkage adds
Adding 35 parts of agent, 105 parts of calcium carbonate powder, 1.2 parts of peroxidized t-butyl perbenzoate, 3.6 parts of release agent, magnesia paste 0.7 part, and third
Olefin(e) acid butyl ester -8 parts of acrylic copolymer, 76 parts of alkali-free glass fibre.Wherein, low shrinkage additive is the first containing polystyrene
Base methyl acrylate solution, the mass fraction of polystyrene are 45%, and release agent is the zinc stearate powder that partial size is 250 mesh.
The thermosetting property sheet molding compound of the present embodiment the preparation method is as follows:
1) Polystyrene powder is added in methyl methacrylate, is stirred under the revolving speed of 550r/min with high speed disperser
After mixing 24min, 21h is stood in the environment of being put into 26 DEG C, is prepared into the low shrinkage additive that polystyrene mass fraction is 45%；
By said ratio, unsaturated polyester resin, low shrinkage additive, initiator and auxiliary agent are poured into agitator and mixed, with high speed
The speed of dispersion machine 900r/min stirs 3min to uniform；
2) by as above proportion, release agent and calcium carbonate powder are added while stirring in the mixture that step 1) obtains, mixes
30min is stirred after conjunction to uniform；
3) by as above proportion, thickener is added in the mixture that step 2) obtains, is stirred with the speed of 1100r/min
Resin paste is obtained after 1min；
4) it is transported to SMC machine group by as above proportion, the resin paste that step 3) is obtained and is scraped in hopper, start compounding machine, on
Lower film is uniformly coated certain thickness resin paste, is equably settled down to after glass fibre is cut into length 30mm
In the resin paste, then so that resin paste is impregnated with glass fibre by crawler belt extruding, obtain the thermosetting property sheet molding compound.
After tested, the shrinking percentage of thermosetting property sheet molding compound is 0.089%, impact strength 62.7kJ/m2, electrical strength
For 20.4kV/mm.
Embodiment 5
Be in place of the difference of the present embodiment and embodiment 1, inorganic filler powder is aluminium-hydroxide powder, other raw materials and
Preparation method is same as Example 1.
After tested, the shrinking percentage of thermosetting property sheet molding compound is 0.080%, impact strength 54.2kJ/m2, electrical strength
For 20.5kV/mm.
Comparative example 1
It is in place of this comparative example and the difference of embodiment 1, unsaturated-resin is the adjacent benzene using styrene as diluent
Type unsaturated-resin, low shrinkage additive are the methyl methacrylate solution containing polystyrene and styrene, other raw materials
And preparation method and embodiment 1 it is all the same.
The thermosetting property sheet molding compound of this comparative example includes by weight 60 parts of unsaturated polyester resin, lower shrinkage adds
Add 40 parts of agent, 90 parts of calcium carbonate powder, 1.0 parts of peroxidized t-butyl perbenzoate, 3 parts of release agent, magnesia paste 1 part, acrylic acid
8 parts of butyl ester-acrylic copolymer, 70 parts of alkali-free glass fibre.Wherein, unsaturated-resin is the neighbour using styrene as diluent
Benzene-type unsaturated-resin, low shrinkage additive are the methyl methacrylate solution containing polystyrene and styrene, polyphenyl second
The mass fraction of alkene is 10%, and the mass fraction of styrene is 20%, and release agent is the Zinc stearate powder that partial size is 100 mesh
End.
The thermosetting property sheet molding compound of this comparative example the preparation method is as follows:
1) by as above proportion, unsaturated polyester resin, low shrinkage additive, initiator and auxiliary agent is poured into agitator and mixed
It closes, stirs 5min to uniform with the speed of high speed disperser 700r/min；
2) by as above proportion, release agent and calcium carbonate powder are added while stirring in the mixture that step 1) obtains, mixes
20min is stirred after conjunction to uniform；
3) by as above proportion, thickener is added in the mixture that step 2) obtains, is stirred with the speed of 900r/min
Resin paste is obtained after 2min；
4) it is transported to SMC machine group by as above proportion, the resin paste that step 3) is obtained and is scraped in hopper, start compounding machine, on
Lower film is uniformly coated certain thickness resin paste, is equably settled down to after glass fibre is cut into length 20mm
In the resin paste, then so that resin paste is impregnated with glass fibre by crawler belt extruding, obtain the thermosetting property sheet molding compound.
After tested, the shrinking percentage of thermosetting property sheet molding compound is 0.079%, impact strength 59.6kJ/m2, electrical strength
For 20.3kV/mm.
Comparative example 2
It is in place of this comparative example and the difference of embodiment 1, by weight, unsaturated-resin is 85 parts, and lower shrinkage adds
Adding agent is 10 parts, other raw materials and preparation method and embodiment 1 are all the same.
After tested, the shrinking percentage of thermosetting property sheet molding compound is 0.119%, impact strength 59.4kJ/m2, electrical strength
For 20.9kV/mm.
Comparative example 3
It is in place of this comparative example and the difference of embodiment 1, by weight, unsaturated-resin is 55 parts, and lower shrinkage adds
Adding agent is 45 parts, other raw materials and preparation method and embodiment 1 are all the same.
After tested, the shrinking percentage of thermosetting property sheet molding compound is 0.076%, impact strength 49.6kJ/m2, electrical strength
For 19.8kV/mm.
Comparative example 4
It is in place of this comparative example and the difference of embodiment 1, the mass fraction of polystyrene is in low shrinkage additive
10%, other raw materials and preparation method and embodiment 1 are all the same.
After tested, the shrinking percentage of thermosetting property sheet molding compound is 0.126%, impact strength 57.8kJ/m2, electrical strength
For 20.5kV/mm.
Comparative example 5
It is in place of this comparative example and the difference of embodiment 1, the mass fraction of polystyrene is in low shrinkage additive
70%, other raw materials and preparation method and embodiment 1 are all the same.
After tested, the shrinking percentage of thermosetting property sheet molding compound is 0.062%, impact strength 50.3kJ/m2, electrical strength
For 20.1kV/mm.
By the experimental result of above-described embodiment 1-5 and comparative example 1 it is found that the present invention uses the unsaturation without styrene to gather
Ester resin and low shrinkage additive without styrene adjust the thermosetting property sheet molding compound being prepared into after proportion, relative to containing
There is thermosetting property sheet molding compound made of the unsaturated polyester resin of styrene and the low shrinkage additive containing styrene, receives
Shrinkage, impact strength and electrical strength have little effect, and can reach product requirement.
It can be seen from comparative example 2,3 change unsaturated polyester resin and low shrinkage additive consumption proportion, i.e., if
The consumption proportion of unsaturated polyester resin and low shrinkage additive in the range of the application limits, not will affect the contraction of material
Rate and impact strength.
In low shrinkage additive it can be seen from comparative example 4,5 content of polystyrene affect material shrinking percentage and
Impact strength, polystyrene content is too low, shrinking percentage can be made to become larger, and polystyrene content is too high, and the impact that can reduce material is strong
Degree.
Detailed process equipment and process flow of the invention that the present invention is explained by the above embodiments, but the present invention is not
It is confined to above-mentioned detailed process equipment and process flow, that is, does not mean that the present invention must rely on above-mentioned detailed process equipment and work
Skill process could be implemented.It should be clear to those skilled in the art, any improvement in the present invention, to product of the present invention
The equivalence replacement of each raw material and addition, the selection of concrete mode of auxiliary element etc., all fall within protection scope of the present invention and public affairs
Within the scope of opening.
Claims (10)
1. a kind of thermosetting property sheet molding compound, which is characterized in that by weight, include 60~70 parts of unsaturated polyester resin
With 30~40 parts of low shrinkage additive, wherein the unsaturated polyester resin and the low shrinkage additive are free of benzene second
Alkene.
2. thermosetting property sheet molding compound according to claim 1, which is characterized in that include following components by weight:
3. thermosetting property sheet molding compound according to claim 1 or 2, which is characterized in that the unsaturated polyester resin is
Use cycloaliphatic acrylates as the unsaturated polyester resin of diluent；
Preferably, the low shrinkage additive is the methyl methacrylate solution containing polystyrene；
Preferably, in the low shrinkage additive, the mass fraction of polystyrene is 30~50%.
4. thermosetting property sheet molding compound described in one of -3 according to claim 1, which is characterized in that the inorganic filler powder is
Calcium carbonate powder or aluminium-hydroxide powder；
The initiator is peroxidized t-butyl perbenzoate；
Preferably, the purity of the peroxidized t-butyl perbenzoate is 98% or more, 104 DEG C of the peroxidized t-butyl perbenzoate
Under half-life period be 10 hours.
5. thermosetting property sheet molding compound described in one of -4 according to claim 1, which is characterized in that the release agent is stearic acid
Zinc powder；
Preferably, the partial size of the zinc stearate powder is 100~300 mesh.
6. thermosetting property sheet molding compound described in one of -5 according to claim 1, which is characterized in that the thickener is magnesia
Paste；
Preferably, the auxiliary agent is size；
Preferably, the size is butyl acrylate-acrylic acid copolymer.
7. thermosetting property sheet molding compound described in one of -6 according to claim 1, which is characterized in that the glass fibre is alkali-free
Glass fibre.
8. a kind of preparation method of the thermosetting property sheet molding compound as described in one of claim 1-7, which is characterized in that the system
Preparation Method the following steps are included:
1) by weight, by 60~70 parts of unsaturated polyester resins, 30~40 parts of low shrinkage additives, 1~1.5 part of initiator
It is stirred evenly after being mixed with 6~8 parts of auxiliary agents；
2) 3~4 parts of release agents and 90~110 parts of inorganic filler powder by weight, are added in the mixture that step 1) obtains
End stirs evenly after mixing；
3) 0.5~1 part of thickener by weight, is added in the mixture that step 2) obtains, obtains resin after mixing evenly
Paste；
4) by weight, 70~80 parts of glass fibres are fallen in the resin paste that step 3) obtains, obtain the thermosetting property
Sheet molding compound.
9. preparation method according to claim 8, which is characterized in that in step 1), the low shrinkage additive is to pass through
Made from following methods: Polystyrene powder being added in methyl methacrylate, with high speed disperser in 400~600r/min
Revolving speed under stir 20~40min after, 20~25h is stood in the environment of being put into 23~27 DEG C, is prepared into polystyrene quality point
The low shrinkage additive that number is 30~50%；
Preferably, in step 1), the stirring is carried out in high speed disperser, and the speed of the stirring is 700~900r/
Min, the time of the stirring are 3~5min；
Preferably, in step 2), the time of the stirring is 20~30min；
Preferably, in step 3), the speed of the stirring is 900~1100r/min, and the time of the stirring is 1~2min；
Preferably, the detailed process of step 4) is that the resin paste for obtaining step 3) is transported to SMC machine group and scrapes in hopper, is started
Compounding machine, lower films are uniformly coated certain thickness resin paste, after glass fibre is cut into 20~30mm of length
It is equably settled down in the resin paste, then so that resin paste is impregnated with glass fibre by crawler belt extruding.
10. preparation method according to claim 8 or claim 9, which is characterized in that the preparation method comprises the following steps:
1) Polystyrene powder is added in methyl methacrylate, with high speed disperser under the revolving speed of 400~600r/min
Stir 20~40min after, in the environment of being put into 23~27 DEG C stand 20~25h, be prepared into polystyrene mass fraction be 30~
50% low shrinkage additive；By weight, by 60~70 parts of unsaturated polyester resins, 30~40 parts of low shrinkage additives, 1
~1.5 parts of initiators and 6~8 parts of auxiliary agents are poured into agitator and are mixed, and are stirred with the speed of 700~900r/min of high speed disperser
3~5min is to uniform；
2) 3~4 parts of release agents and 90~110 parts of nothings by weight, are added while stirring in the mixture that step 1) obtains
Machine filler powder stirs 20~30min to uniform after mixing；
3) 0.5~1 part of thickener is added, in the mixture that step 2) obtains by weight, with 900~1100r/min's
Speed obtains resin paste after stirring 1~2min；
4) resin paste that by weight, step 3) is obtained is transported to SMC machine group and scrapes in hopper, starts compounding machine, thin up and down
Film is uniformly coated certain thickness resin paste, after 70~80 parts of glass fibre is cut into 20~30mm of length
It is settled down in the resin paste evenly, then so that resin paste is impregnated with glass fibre by crawler belt extruding, obtain the thermosetting property piece
Shape moulding compound.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110408160A (en) * | 2019-08-21 | 2019-11-05 | 合肥工业大学 | A kind of sheet molding compound and preparation method for room temperature rapid shaping |
| CN111925638A (en) * | 2020-07-31 | 2020-11-13 | 广东百汇达新材料有限公司 | Efficient heat-preservation SMC sheet molding compound and preparation method thereof |
| CN111978477A (en) * | 2019-05-24 | 2020-11-24 | 比亚迪股份有限公司 | Sheet molding compound raw material, sheet molding compound product, and preparation method and application thereof |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5393830A (en) * | 1993-03-01 | 1995-02-28 | Aristech Chemical Corporation | Laminating resins having low organic emissions |
| CN1324373A (en) * | 1998-10-19 | 2001-11-28 | 戴尼亚化学有限公司 | Unsaturated polyester resins |
| CN102358798A (en) * | 2011-09-13 | 2012-02-22 | 青岛润兴高分子材料有限公司 | High strength sheet molding plastics and production method |
| CN102634184A (en) * | 2012-05-17 | 2012-08-15 | 镇江育达复合材料有限公司 | SMC (sheet molding compound) material for passenger car covering parts and preparation method thereof |
| CN107459797A (en) * | 2017-09-19 | 2017-12-12 | 株洲时代新材料科技股份有限公司 | A kind of high-flexibility polyester epoxy impregnation resin and preparation method thereof |
| CN107556721A (en) * | 2017-10-10 | 2018-01-09 | 无锡新宏泰电器科技股份有限公司 | A kind of SMC polyester molding compounds and preparation method thereof |
-
2018
- 2018-12-03 CN CN201811466524.4A patent/CN109438950A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5393830A (en) * | 1993-03-01 | 1995-02-28 | Aristech Chemical Corporation | Laminating resins having low organic emissions |
| CN1324373A (en) * | 1998-10-19 | 2001-11-28 | 戴尼亚化学有限公司 | Unsaturated polyester resins |
| CN102358798A (en) * | 2011-09-13 | 2012-02-22 | 青岛润兴高分子材料有限公司 | High strength sheet molding plastics and production method |
| CN102634184A (en) * | 2012-05-17 | 2012-08-15 | 镇江育达复合材料有限公司 | SMC (sheet molding compound) material for passenger car covering parts and preparation method thereof |
| CN107459797A (en) * | 2017-09-19 | 2017-12-12 | 株洲时代新材料科技股份有限公司 | A kind of high-flexibility polyester epoxy impregnation resin and preparation method thereof |
| CN107556721A (en) * | 2017-10-10 | 2018-01-09 | 无锡新宏泰电器科技股份有限公司 | A kind of SMC polyester molding compounds and preparation method thereof |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111978477A (en) * | 2019-05-24 | 2020-11-24 | 比亚迪股份有限公司 | Sheet molding compound raw material, sheet molding compound product, and preparation method and application thereof |
| CN111978477B (en) * | 2019-05-24 | 2021-10-22 | 比亚迪股份有限公司 | Sheet molding compound raw material, sheet molding compound product, and preparation method and application thereof |
| CN110408160A (en) * | 2019-08-21 | 2019-11-05 | 合肥工业大学 | A kind of sheet molding compound and preparation method for room temperature rapid shaping |
| CN111925638A (en) * | 2020-07-31 | 2020-11-13 | 广东百汇达新材料有限公司 | Efficient heat-preservation SMC sheet molding compound and preparation method thereof |
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