CN1903563A - SMC sheets and its prepn. method - Google Patents
SMC sheets and its prepn. method Download PDFInfo
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- CN1903563A CN1903563A CN 200610089183 CN200610089183A CN1903563A CN 1903563 A CN1903563 A CN 1903563A CN 200610089183 CN200610089183 CN 200610089183 CN 200610089183 A CN200610089183 A CN 200610089183A CN 1903563 A CN1903563 A CN 1903563A
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Abstract
A SMC sheet with high surface quality and luster is composed of both surficial PE films and a core material prepared from glass fibers through immersing them in the resin paste which is proportionally from unsaturated polyester resin, low-shrinkage additive, internal demoulding agent, calcium carbonate, styrene, trigger and magnesium oxide.
Description
Technical field
The present invention relates to SMC sheet material and preparation method thereof.
Background technology
" SMC " is the english abbreviation of sheet molding compound Sheet Molding Compound, and core is made up of the glass fibre that has flooded resin paste in the middle of it, and upper and lower surface covers with the PE film; Wherein, contain various components such as unsaturated polyester resin, low shrinkage additive, inner pattern releasing agent applicable, filler, styrene, initator, thickener, mill base in the resin paste, form a kind of " sandwich ".The production of SMC and forming process are roughly as follows: glass fibre is put on the PE film that has evenly applied resin paste in advance, cover the PE film that another layer applied resin paste then thereon, by crawler belt or the back rolling of dip roll dipping, then thickening at a certain temperature reaches tack-free, carries out compression molding again.The SMC sheet material appears at Europe first the sixties in last century, states such as U.S., day successively develop this technology subsequently, through 40 years of development, now progressively develop in the field of compound material the most ripe, use a kind of very widely technology, its product is widely used in the industries such as vehicle, building, electronics/electric.In recent years, along with the global energy crisis aggravation, countries in the world were more and more higher to environmental protection and requirements of saving energy, and in auto industry field, the application of SMC goods is (as bumper, dashboard, deflector, face shield etc.) more and more widely.
The SMC sheet material develops swift and violent novel moulded material as a kind of, has many characteristics: 1. favorable reproducibility is not subjected to the influence of operator and external condition; 2. operational processes is convenient; 3. clean operation environment, health have been improved working condition; 4. good fluidity, plastic special-shaped products; 5. fibre length 25～50mm, quality uniformity is good, is suitable for the pressed section and changes little large thin-wall goods; 6. resulting product surface smoothness height, adopt low shrinkage additive after, surface quality is even more ideal; 7. production efficiency height, molding cycle is short, is easy to realize the full automatic mechanical operation, and production cost is relatively low.For example, compression molding SMC auto parts just have many advantages, as: with short production cycle, can satisfy batch production requirement, returns of investment are better; Weight is lighter, saves fuel oil, and blowdown is less; Design the good integrity of free part, quantity seldom; Durability and heat insulation, sound insulation is good etc.Have again, the SMC forming technique have other technologies incomparable advantage (product size good stability, smooth surface), be applied in some light structure spares widely especially.
At present, the product defects that the sheet material major part that market occurs suppresses is more, as: pin hole is more, poor mobile performance, and product surface quality is poor, and back patch work amount is bigger or the like.
Summary of the invention
The purpose of this invention is to provide the good SMC sheet material of a kind of surface quality.
SMC sheet material provided by the present invention, core is made up of the glass fibre that has flooded resin paste in the middle of it, and upper and lower surface covers with the PE film, and wherein, resin paste contains the component of following ratio of weight and number:
Unsaturated polyester resin 60-80,
Low shrinkage additive 20-40,
Auxiliary agent 1-2
Inner pattern releasing agent applicable 2-4,
Calcium carbonate 120-160,
Styrene 4-6,
Initator 1-2.5,
Magnesia 1-3
Glass fibre 60-90
Wherein, low shrinkage additive is commonly used PVAc, PS or PMMA; It is 325 orders and 600 purpose mixed calcium carbonates that calcium carbonate is selected particle diameter for use, and 325 order calcium carbonate are 1 with the mixed weight ratio of 600 order calcium carbonate: 0.5-1: 2.
For hardening time and the forming temperature that reduces the SMC sheet material, initator can be selected TBPB or TBPB/TBPO composite initiator system for use, preferred TBPB/TBPO composite initiation system, wherein, TBPB in the composite initiation system and the weight proportion of TBPO are 0.7-0.8: 0.2-0.3.
In order to make product can satisfy different specific (special) requirements, resin paste also can add the mill base that the 1-10 weight portion is arranged and/or the auxiliary agent of 1-2 weight portion.Auxiliary agent commonly used is BYK W-972 or BYK W-996, and mill base is organic pigment mill base or inorganic pigment color paste.
In the present invention, unsaturated polyester resin commonly used has adjacent benzene resin, isophthalic resin or vinylite; Inner pattern releasing agent applicable has zinc stearate or calcium stearate.
For surface property, mechanical property and the processing performance of improving material, glass fibre is selected alkali-free glass fibre for use, its length is the composite fibre that the alkali-free glass fibre of 1 inch and 1/2 inch mixes, and 1 inch alkali-free glass fibre and 1/2 inch alkali-free glass fibre hybrid ratio are 1: 0.5-1: 2; Alkali-free glass fibre addition after mixing accounts for the 20-30% of SMC total sheet weight.
The preparation method of SMC sheet material of the present invention comprises the steps:
1) order according to unsaturated polyester resin, low shrinkage additive, inner pattern releasing agent applicable, calcium carbonate adds in proportion successively, adds styrene, initator and magnesia after mixing again, and mixing and stirring is made resin paste;
2) resin paste evenly is coated on the upper and lower PE film by scraper; Cut the alkali-free glass fibre of 1 inch and 1/2 inch then respectively with the cutter of different parameters design, the different alkali-free glass fibre of two kinds of length is in 1: 1/2-1: 2 ratio scatters in resin paste, and the assorted fibre amount that is sprinkled into accounts for the 20-30% of SMC total sheet weight; Upper and lower PE film is pasted relatively, this PE film adopts density polyethylene film with high again; Form the resin paste sheet material of the upper and lower PE of a being covered with film, it is extruded by crawler belt, its alkali-free glass fibre and resin paste are fully flooded, be shaped to sheet material, carry out rolling then.
3) the SMC sheet material with rolling is transported to the thickening of thickening chamber, and thickening temperature is 30-36 ℃, and the thickening time is 24-48 hour.
In preparation process, the initial temperature of resin paste is 28-32 ℃; The temperature of thickening chamber is 30-36 ℃, and the thickening time of sheet material is 24-48 hour.
The present invention selects and design by resin, low shrinkage additive, filler, glass fibre etc. are optimized, and employing composite initiator system, effectively reduce the hardening time and the forming temperature of SMC sheet material, improved production efficiency of products, and the surface quality that can make the SMC sheet material reaches the conditional request on A level surfaces such as zero defect, non-ripple, glossiness be good, and SMC sheet material of the present invention is used widely at automotive field.
Description of drawings
Figure 1A-Fig. 1 C is respectively PS (polystyrene), PMMA (polymethyl methacrylate) and three kinds of different low shrinkage additives of PVAc (polyvinyl acetate) solidify the ESEM collection of illustrative plates of sample afterwards in the resin crosslinks system;
Fig. 2 is the coefficient of expansion-temperature curve of three kinds of different low shrinkage additives among Fig. 1.
The specific embodiment
SMC sheet material of the present invention, core is made up of the glass fibre that has flooded resin paste in the middle of it, and upper and lower surface covers with the PE film, and the key step of this sheet forming is as follows:
The first step: preparation resin paste (weight portion):
The A component constitutes:
Unsaturated polyester resin 60-80,
Low shrinkage additive 20-40,
Inner pattern releasing agent applicable 2-4,
Calcium carbonate 120-160,
Wherein, unsaturated polyester resin be in adjacent benzene resin, isophthalic resin or the vinylite any; Low shrinkage additive be among PVAc (polyvinyl acetate), PS (polystyrene) or the PMMA (polymethyl methacrylate) any; Inner pattern releasing agent applicable be in zinc stearate, the calcium stearate any; Calcium carbonate is that particle diameter is 325 orders and 600 purpose mixed calcium carbonates, and the weight proportion of 325 order calcium carbonate and 600 order calcium carbonate is 1: 0.5-1: 2.
The B component constitutes:
Styrene 4-6,
Initator 1-2.5,
Magnesia 1-3.
Wherein, initator is selected TBPB or TBPB/TBPO composite initiation system for use, and wherein, TBPB is a peroxidized t-butyl perbenzoate, and TBPO is the peroxidating hecanoic acid t-butyl ester.TBPB in the composite initiation system and the weight proportion of TBPO are 0.7-0.8: 0.2-0.3, and the use of this composite initiator system can effectively reduce the hardening time and the forming temperature of SMC sheet material.
In order to make product can satisfy different specific (special) requirements, resin paste can also add the mill base of 1-10 weight portion and/or the auxiliary agent of 1-2 weight portion; Wherein, mill base is selected for use in organic pigment mill base or the inorganic pigment color paste a kind of, and the organic pigment mill base can be used pthalocyanine blue mill base or phthalocyanine green mill base; Inorganic pigment color paste can be used titanium white mill base or carbon black color paste; Auxiliary agent can be selected for use among BYK W-972 or the BYK W-996 a kind of, and this auxiliary agent is the chemical products that German Bi Ke company produces.
Second step: fiber cutting
Fibre reinforced materials is selected alkali-free glass fibre for use, do not wait long fibre with what two cutters of design different parameters cut into alkali-free glass fibre 1 inch and 1/2 inch respectively, the limit cutting edge with the fiber of two kinds of different lengths in 1: 1/2-1: 2 ratio scatters in resin paste, and the addition of two kinds of fibers accounts for the 20-30% of SMC total sheet weight.
The 3rd step: the preparation method of SMC sheet material comprises the steps:
1) order according to unsaturated polyester resin, low shrinkage additive, inner pattern releasing agent applicable, calcium carbonate adds in proportion successively, adds styrene, initator and magnesia after mixing again, and mixing and stirring is made resin paste; According to the specific (special) requirements of technology, also can in resin paste, add mill base and/or auxiliary agent in proportion;
The A component of formations such as unsaturated polyester resin, low shrinkage additive, inner pattern releasing agent applicable, calcium carbonate requires that sufficient mixing time will be arranged, so that each component can mix, to avoid causing product defects.The B component that styrene, initator and magnesia constitute adds before production, its addition is wanted accurately, require simultaneously to guarantee sufficient mixing time, but mixing time is unsuitable long, in order to avoid cause the viscosity increased of resin paste, the dipping that influences fibre reinforced materials is complete.
If according to product requirement, in resin paste, add auxiliary agent and/or mill base, its auxiliary agent and/or mill base will add after the A component drops into low shrinkage additive, and then add interior remover and filler, mix the back fully and use.
2) will be after mixing, the resin paste of its initial temperature in 28-32 ℃ of scope, with scraper it evenly is coated on the upper and lower PE film, two cutters by the design of different cutting parameters cut the alkali-free glass fibre of 1 inch and 0.5 inch respectively, the different alkali-free glass fibre of two kinds of length is with 1: 0.5-1: 2 ratio is sprinkled in the resin paste, upper and lower PE film is pasted relatively, this PE film adopts density polyethylene film with high again; Form the resin paste sheet material of the upper and lower PE of a being covered with film, it is extruded by crawler belt, its alkali-free glass fibre and resin paste are fully flooded, be shaped to sheet material, carry out rolling then.
3) material delivery with rolling arrives the thickening of thickening chamber, and the temperature of thickening chamber is set to 30-36 ℃, and the thickening time of sheet material is 24-48 hour, obtains described SMC sheet material thereafter.
1-5 is described further technical scheme of the present invention by the following examples:
Embodiment 1: the SMC sheet material of different low shrinkage additives
Low shrinkage additive is the greatest factor of decision product surface quality, also is the main determining factor of SMC sheet material cost.According to being applied on the different auto parts and components, desired shrinkage factor is difference to some extent, selects for use different low shrinkage additives can produce different effects for the SMC sheet material.
The first step: preparation resin paste
Resin paste is formed (weight portion):
The A component constitutes:
Adjacent benzene resin: 60 parts
PVAc:40 part
Zinc stearate: 3.5 parts
BYKW-972:1 part
325 order calcium carbonate: 80 parts
600 order calcium carbonate: 40 parts
The B component constitutes:
Styrene: 5 parts
TBPB:1 part
Magnesia: 1.4 parts
Titanium white mill base: 1 part
During the preparation resin paste, earlier with the various components in the A component, order according to unsaturated polyester resin (adjacent benzene resin), low shrinkage additive (PVAc), auxiliary agent (BYKW-972), inner pattern releasing agent applicable (zinc stearate), filler (calcium carbonate) adds, fully stir so that each component mixes, to avoid causing defectives such as product sand holes, filler gathering; Then, add the various components in the B component again, stir jointly, promptly obtain resin paste.Initator is wherein selected TBPB (peroxidized t-butyl perbenzoate) initator for use.
Second step: preparation SMC sheet material
1) getting initial temperature is that 28 ℃ resin paste evenly is coated on the upper and lower PE film by scraper, again two cutters by being provided with the design of different cutting parameters respectively Cutting Length be the alkali-free glass fibre of 1 inch and 1/2 inch, its line density is 4800Tex, the different alkali-free glass fibre of these two kinds of length mixes in 1: 2 ratio and is sprinkled in the resin paste, and the amount of being sprinkled into of above-mentioned alkali-free glass fibre accounts for 30% of SMC sheet material total amount; Upper and lower PE film is pasted relatively, this PE film adopts density polyethylene film with high again; Form the resin paste sheet material of the upper and lower PE of a being covered with film, it is extruded by crawler belt, alkali-free glass fibre and resin paste are fully flooded, be shaped to sheet material, carry out rolling then.
2) the SMC sheet material with rolling is transported to the thickening of thickening chamber, and thickening temperature is 32 ℃, and the thickening time is 24 hours.
Different purposes according to the SMC sheet material, the desired shrinkage factor of its product is also different, the different-effect of table 1 for selecting for use different low shrinkage additives that its SMC sheet material is produced, as add the different SMC sheet material of three kinds of different low shrinkage additive institute moulding, it is as shown in table 1 to detect the shrinkage factor and the surface roughness that obtain.
The low contractive effect of table 1 different additive
| Material number | The low shrinkage additive kind | Shrinkage factor, % | Surface roughness, μ m |
| SMC1 SMC2 SMC3 | PS PMMA PVAc | 0.6-1.1 0.1-0.5 0-0.05 | 3-4 0.7-1.0 0.4-0.7 |
By data presented in the table 1 as can be seen, the low contractive effect of PVAc is best, and surface property is best; PMMA be low shrinkage additive prescription low-shrinkage can and surface property next, the effect of PS is the poorest.Figure 1A-Fig. 1 C is PS, PMMA and three kinds of different low shrinkage additives of PVAc solidify the back sample in the resin crosslinks system an ESEM collection of illustrative plates, as seen from the figure, compatibility was best when the system behind the interpolation PS was heated, decentralized photo is minimum, it is few to expand after particle is heated, with resin continuous phase cure shrinkage to offset effect corresponding relatively poor, with test data be corresponding to.
The difference of the contraction control ability between the thermoplastic additive can be done best explanation with its different coefficient of expansion.Fig. 2 is the coefficient of expansion-temperature curve of PS, PMMA and PVAc.The flex point of figure cathetus is represented the glass transition temperature (Tg) of every kind of material.Obviously, rising along with temperature, because bigger thermal coefficient of expansion, under uniform temp, PVAc has bigger volume than the PMMA of identical weight, and thermal expansion speed is fast, can expand at a lower temperature, contraction in the time of can better replenishing resin system solidified, thus make the low contractive effect of PVAc be better than PMMA.
Therefore, selecting the low shrinkage additive system of PVAc system for the SMC sheet material on acquisition A level surface for use, is optimum implementation of the present invention.
Embodiment 2: filler is for the influence of SMC sheet material
In SMC technology, filler systems is for improving the important effect of play more and more on the final performance of resin system performance and product.The major function of filler is the manufacturability that reduces the cost of material, improves SMC manufacturing and moulding, and improves the various correlated performances of SMC goods, as surface property, electrical property, fire resistance, mechanical performance etc.Under high amount of filler condition, the filler granularity is more little, and SMC resin paste apparent viscosity is more little, and surface quality is high more.Therefore, perform to maximum, necessary careful consideration type of material, consumption and grade for making the benefit of filler in SMC.Adopting calcium carbonate among the present invention is filler, by to filler granularity, content to the performance of product and the quality influence on surface, select appropriate filler and consumption.
Method according to embodiment 1 prepares the SMC sheet material, wherein, and resin paste composed as follows:
Resin paste is formed (weight portion):
The A component constitutes:
Vinylite: 80 parts
PS:20 part
Zinc stearate: 2 parts
325 order calcium carbonate: 40 parts
600 order calcium carbonate: 80 parts
The B component constitutes:
Styrene: 4 parts
TBPB:2.5 part
Magnesia: 1 part
Above-mentioned initator is selected TBPB (peroxidized t-butyl perbenzoate) initator for use.
The resin paste of getting initial temperature and be 32 ℃ evenly is coated on the upper and lower PE film by scraper, above the PE film, be provided with two cutters that are provided with different cutting parameters, the fiber Cutting Length is set at 1 inch and 1/2 inch respectively, the line density of fiber is 4800Tex, be sprinkled in the resin paste simultaneously after the alkali-free glass fibre that these two kinds of length are different cuts in 1: 2 ratio, its amount of being sprinkled into accounts for 28% of SMC sheet material total amount by its cutting quantity control; Upper and lower PE film is pasted relatively, this PE film adopts density polyethylene film with high again; Form the resin paste sheet material of the upper and lower PE of a being covered with film, it is extruded by crawler belt, its alkali-free glass fibre and resin paste are fully flooded, be shaped to sheet material, carry out rolling then.
Then, the SMC sheet material with rolling is transported to the thickening of thickening chamber again, and thickening temperature is set at 28 ℃, and the thickening time is 48 hours.
The particle size range of the selected calcium carbonate of filler comprises 325 orders, 600 orders and 1250 orders, and to utilizing the calcium carbonate consumption of aforementioned three kinds of granularities, directly influential to the performance of its SMC sheet material that makes, its performance indications result is respectively shown in table 2, table 3 and table 4.
Table 2 filler granularity influences unit: cp to SMC resin paste viscosity
| Portions of resin calcium carbonate (weight ratio) | 325 order calcium carbonate | 600 order calcium carbonate | 1250 order calcium carbonate |
| 1∶0.8 1∶1.0 1∶1.2 1∶1.8 | 6032 38720 108000 480000 | 5200 24000 62720 184300 | 5088 24000 61920 160000 |
Table 3 filler granularity is to the unit that influences of the surface property of SMC goods: μ m
| Portions of resin calcium carbonate (weight ratio) | 325 order calcium carbonate | 600 order calcium carbonate | 1250 order calcium carbonate |
| 1∶0.8 1∶1 1∶1.2 1∶1.8 | 3-4 3-4 3-4 7-8 | 1-2 1-2 1-2 5-7 | 0.3-0.6 0.3-0.6 0.3-0.6 1-5 |
Table 4 filler addition is to the influence of product properties
| The prescription sequence number | 1 | 2 | 3 | 4 | 5 |
| Portions of resin calcium carbonate (weight ratio) hot strength, the MPa bending strength, the Gpa shrinkage factor, the % surface roughness, μ m | 100∶110 63.5 123 0.013 3-4 | 1∶140 64.7 107 0.014 3-4 | 1∶160 63.9 111 0.012 3-4 | 1∶180 40.3 83 0.005 7-8 | 1∶200 35.9 74 0.006 7-8 |
Remarks: wherein fiber content is 28%.
The result shows that when filer content was excessive, bending property, tensile property and the surface property of examination body reduced.This mainly is because addition when excessive, and the dispersive property of calcium carbonate is poor in the sample, and the infiltration of resin and filler is not enough, causes the inner stress raisers of goods and makes material damage; When the filler of Jia Ruing is too much simultaneously, normally carrying out of mixing procedure will be had a strong impact on.The surface quality of SMC sheet material was bad when the granularity of filler was big, and the surface quality of granularity hour SMC sheet material is good.Consider the mobile performance of SMC sheet material, in conjunction with goods required mechanical performance and surface property, therefore, the addition that is fit to of filler is 120～160 parts, and the granularity of selecting filler for use is 325 and 600 orders, and the ratio that the best is selected for use is 1: 1.
Embodiment 3: the selection of initiator system
Curing rate is one of principal element that influences production efficiency, and is more important for the large-scale component curing technology.The present invention studies composite initiation system by system test, has analyzed each factor to gel time, gelling temp, hardening time, curing exothermic peak Temperature Influence by exotherm.
Method according to embodiment 1 prepares the SMC sheet material, wherein, and resin paste composed as follows:
Resin paste is formed (weight portion):
The A component constitutes:
Isophthalic resin: 70 parts
PMMA:30 part
Zinc stearate: 4 parts
BYK W-972:2 part
325 order calcium carbonate: 80 parts
600 order calcium carbonate: 80 parts
The B component constitutes:
Styrene: 6 parts
TBPB/TBPO:2 part
Magnesia: 3 parts
Carbon black color slurry: 6 parts
Above-mentioned TBPB/TBPO is the initator of composite initiation system, and wherein, TBPB is a peroxidized t-butyl perbenzoate, and TBPO is the peroxidating hecanoic acid t-butyl ester, and the weight proportion of TBPB and TBPO is 0.7-0.8: 0.2-0.3 in the initator of composite initiation system.
The resin paste of getting initial temperature and be 28 ℃ evenly is coated on the upper and lower PE film by scraper, above the PE film, be provided with two cutters that are provided with different cutting parameters, the fiber Cutting Length is set at 1 inch and 1/2 inch respectively, the line density of fiber is 4800Tex, be sprinkled in the resin paste simultaneously after the alkali-free glass fibre that these two kinds of length are different cuts in 1: 2 ratio, its amount of being sprinkled into accounts for 20% of SMC sheet material total amount by its cutting quantity control; Upper and lower PE film is pasted relatively, this PE film adopts density polyethylene film with high again; Form the resin paste sheet material of the upper and lower PE of a being covered with film, it is extruded by crawler belt, its alkali-free glass fibre and resin paste are fully flooded, be shaped to sheet material, carry out rolling then.
The SMC sheet material of rolling is transported to the thickening of thickening chamber, and thickening temperature is set at 30 ℃, and the thickening time is 48 hours.
Table 5, table 6 are the influence to the forming temperature and the gel time of unsaturated polyester resin of different initiator type.From data as can be seen, the use of TBPB/TBPO composite initiation system can reduce curing reaction time and forming temperature, and the surface quality of final products has also obtained raising to a certain degree.Therefore, the initator of selecting the TBPB/TBPO composite initiation system for use is a preferred forms of the present invention, and wherein the mixing ratio of TBPB and TBPO is 0.8: 0.2.
Table 5 initator is to the influence of unsaturated polyester resin forming temperature and gel time
| Main initator | Auxiliary initator | Gel time s | ||||||
| Title | Content | Title | Content | 110℃ | 120℃ | 130 | 140℃ | 150℃ |
| TBPB | 1.00 | 198 | 164 | 114 | 65 | 43 | ||
| TBPB | 0.85 | TBPO | 0.15 | 158 | 118 | 89 | 47 | 35 |
| TBPB | 0.75 | TBPO | 0.25 | 125 | 92 | 45 | 29 | 10 |
| TBPB | 0.90 | BPO | 0.10 | 128 | 99 | 78 | 35 | 22 |
| DCP | 1.00 | 214 | 186 | 138 | 94 | 68 | ||
| DCP | 0.85 | TBPO | 0.15 | 100 | 82 | 69 | 33 | 18 |
| Remarks | In the process of the test iron plate is heated under the temperature of appointment and tests gel time | |||||||
Table 6 initiator system is to the SMC effect of material performance
| Main initator | Auxiliary initator | Hardening time s | Production cycle s | The residual % of St | Surface quality | ||
| Title | Content | ||||||
| TBPB | 1.00 | TBPO | 0.15 | 135 | 250 | 1.89 | Generally |
| TBPB | 0.85 | TBPO | 0.25 | 86 | 185 | 0.56 | Good |
| TBPB | 0.75 | BPO | 0.10 | 60 | 120 | 0.43 | Good |
| TBPB | 0.90 | 97 | 200 | 1.78 | Generally | ||
| DCP | 1.00 | TBPO | 0.15 | 165 | 295 | 3.50 | Bad |
| DCP | 0.85 | 118 | 220 | 1.16 | Generally | ||
| Remarks: the forming temperature scope is 120～130 ℃ | |||||||
Embodiment 4: the selection of reinforcing material
The general requirement of the used reinforcing material of SMC is: dipping property is good, good fluidity, product strength height, outward appearance are good.The general requirement of the used reinforcing material of SMC is: dipping property is good, good fluidity, product strength height, outward appearance are good.For this reason, select for use alkali-free glass fibre as reinforcing material, research fiber content and fibre length are to the influence of prescription surface property, mechanical property and mobile performance.
Method according to embodiment 1 prepares the SMC sheet material, wherein, and resin paste composed as follows:
Resin paste is formed (weight portion):
The A component constitutes:
Adjacent benzene resin: 60 parts
PVAc:20 part
Calcium stearate: 3.5 parts
BYK W-996:1.5 part
325 order calcium carbonate: 100 parts
600 order calcium carbonate): 50 parts
The B component constitutes:
Styrene: 6 parts
TBPB/TBPO:2.5 part
Magnesia: 2 parts
Organic pigment mill base: 6 parts
Wherein, TBPB/TBPO is the initator of composite initiation system, and wherein, TBPB is a peroxidized t-butyl perbenzoate, and TBPO is the peroxidating hecanoic acid t-butyl ester, and the weight proportion of TBPB and TBPO is 0.7: 0.3 in the initator of composite initiation system.The organic pigment mill base can be selected pthalocyanine blue or phthalocyanine green for use.
The resin paste of getting initial temperature and be 30 ℃ evenly is coated on the upper and lower PE film by scraper, above the PE film, be provided with two cutters that are provided with different cutting parameters, the fiber Cutting Length is set at 1 inch and 1/2 inch respectively, the line density of fiber is 4800Tex, after cutting in the ratio in the table 7, the alkali-free glass fibre that these two kinds of length are different is sprinkled in the resin paste, its amount of being sprinkled into accounts for 25% of SMC sheet material total amount by its cutting quantity control; Upper and lower PE film is pasted relatively, this PE film adopts density polyethylene film with high again; Form the resin paste sheet material of the upper and lower PE of a being covered with film, it is extruded by crawler belt, its alkali-free glass fibre and resin paste are fully flooded, be shaped to sheet material, carry out rolling then.
The SMC sheet material of rolling is transported to the thickening of thickening chamber, and thickening temperature is set at 36 ℃, and the thickening time is 48 hours.
Present embodiment has carried out comparative analysis by the mixing match amount and the mixing procedure of table 7 pair 6 kinds of different fiber contents, 1 inch and 1/2 inch fiber to the SMC Effect on Performance, by data analysis as can be known, it is many more that fibre length is grown, the mobile performance of SMC is poor more, and the surface property of goods is poor more.Equally, fiber content is high more, and the mobile performance of SMC is poor more, and the surface property of goods is poor more.For this reason, under the prerequisite that satisfies the properties of product requirement, the fiber content of selection is low more, fibre length is short more, and the surface property of goods is good more.Take all factors into consideration surface property, mechanical property and the processing performance of SMC sheet material, selecting length is the alkali-free fiber hybrid use of 1 inch and 1/2 inch, is preferred forms of the present invention as reinforcing material.
Table 7 fiber content, batch mixing ratio and consumption are to the SMC Effect on Performance
| Numbering | 1 | 2 | 3 | 4 | 5 | 6 |
| Fiber content, % 1inch fiber, % 1/2inch fiber, % mixing procedure mobile performance, the cm shrinkage factor, the % hot strength, the MPa bending strength, the Gpa surface property, μ m | 30 30 0 general 270-0.05 94 135 0.39 | 25 15 10 320-0.01 73 125 0.31 | 20 20 0 460-0.02 65 118 0.26 | 25 5 20 220-0.04 61 80 0.18 | 25 10 15 525-0.01 55 99 0.32 | 20 0 20 631-0.01 31 85 0.31 |
Embodiment 5: the control of condition of molding
The forming process of SMC sheet material is as follows:
1) getting initial temperature is that 28-32 ℃ resin paste evenly is coated on the upper and lower PE film by scraper, above the PE film, be provided with two cutters that are provided with different cutting parameters, the fiber Cutting Length is set at 1 inch and 1/2 inch respectively, the line density of fiber is 4800Tex, the different alkali-free glass fibre of two kinds of length is in 1: 0.5-1: be sprinkled in the resin paste after 2 the ratio cutting, its amount of being sprinkled into accounts for 25% of SMC sheet material total amount by the cutting quantity control of its fiber; Upper and lower PE film is pasted relatively, this PE film adopts density polyethylene film with high again; Form the resin paste sheet material of the upper and lower PE of a being covered with film, it is extruded by crawler belt, its alkali-free glass fibre and resin paste are fully flooded, be shaped to sheet material, carry out rolling then.
2) flaky material after the rolling is transported to the thickening of thickening chamber, the temperature of thickening chamber should be set in 30-36 ℃, and the thickening time of SMC sheet material was at 24-48 hour; Obtain the SMC sheet material after the thickening.
In its curing molding process, the initial temperature of strict control resin paste is very necessary, and the initial temperature of its resin paste is controlled at 30 ± 2 ℃ for best.
Claims (10)
1, a kind of SMC sheet material, core is made up of the glass fibre that has flooded resin paste in the middle of it, and upper and lower surface covers with the PE film, and it is characterized in that: described resin paste contains the component of following ratio of weight and number:
Unsaturated polyester resin 60-80,
Low shrinkage additive 20-40,
Inner pattern releasing agent applicable 2-4,
Calcium carbonate 120-160,
Styrene 4-6,
Initator 1-2.5,
Magnesia 1-3.
2, SMC sheet material according to claim 1 is characterized in that: described low shrinkage additive be among PVAc, PS or the PMMA any; Described calcium carbonate is that particle diameter is 325 orders and 600 purpose mixed calcium carbonates, and both weight ratios are 1: 0.5-1: 2.
3, SMC sheet material according to claim 1 is characterized in that: described initator is TBPB or TBPB and TBPO composite initiation system, and wherein the weight proportion of TBPB/TBPO is 0.7-0.8/0.2-0.3.
4, SMC sheet material according to claim 1 is characterized in that: described unsaturated polyester resin be in adjacent benzene resin, isophthalic resin or the vinylite any; Described inner pattern releasing agent applicable be in zinc stearate or the calcium stearate any.
5, according to the arbitrary described SMC sheet material of claim 1-4, it is characterized in that: described resin paste also contains the mill base of 1-10 weight portion and/or the auxiliary agent of 1-2 weight portion.
6, SMC sheet material according to claim 5 is characterized in that: described auxiliary agent be among BYK W-972 or the BYK W-996 any; Mill base be in organic pigment mill base or the inorganic pigment color paste any.
7, SMC sheet material according to claim 6, it is characterized in that: it is 1 inch and 1/2 inch mixed assorted fibre of alkali-free glass fibre that described glass fibre is got length, and 1 inch alkali-free glass fibre and 1/2 inch alkali-free glass fibre mixing ratio are 1: 0.5-1: 2.
8, SMC sheet material according to claim 7, it is characterized in that: described assorted fibre addition accounts for the 20-30% of described SMC total sheet weight.
9, the preparation method of the described SMC sheet material of a kind of claim 1 comprises the steps:
1) order according to unsaturated polyester resin, low shrinkage additive, inner pattern releasing agent applicable, calcium carbonate adds in proportion successively, adds styrene, initator and magnesia after mixing again, mixes and makes resin paste;
2) resin paste evenly is coated on the upper and lower PE film by scraper, and the cutter cuts glass fibre by the crawler belt extrusion, fully floods its alkali-free glass fibre and resin paste, is shaped to sheet material, carries out rolling then;
3) material delivery with rolling arrives the thickening of thickening chamber, obtains described SMC sheet material.
10, preparation method according to claim 9 is characterized in that: the initial temperature of resin paste is 28-32 ℃; The temperature of thickening chamber is 30-36 ℃, and the thickening time of sheet material is 24-48 hour.
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| CN 200610089183 CN1903563A (en) | 2006-08-08 | 2006-08-08 | SMC sheets and its prepn. method |
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| CN 200610089183 CN1903563A (en) | 2006-08-08 | 2006-08-08 | SMC sheets and its prepn. method |
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