CN114685967A - Low-density SMC product and preparation method thereof - Google Patents
Low-density SMC product and preparation method thereof Download PDFInfo
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- CN114685967A CN114685967A CN202210477640.6A CN202210477640A CN114685967A CN 114685967 A CN114685967 A CN 114685967A CN 202210477640 A CN202210477640 A CN 202210477640A CN 114685967 A CN114685967 A CN 114685967A
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- 238000002360 preparation method Methods 0.000 title claims abstract description 11
- 238000004519 manufacturing process Methods 0.000 title claims description 19
- 239000000843 powder Substances 0.000 claims abstract description 37
- 239000003365 glass fiber Substances 0.000 claims abstract description 33
- 235000017166 Bambusa arundinacea Nutrition 0.000 claims abstract description 30
- 235000017491 Bambusa tulda Nutrition 0.000 claims abstract description 30
- 241001330002 Bambuseae Species 0.000 claims abstract description 30
- 235000015334 Phyllostachys viridis Nutrition 0.000 claims abstract description 30
- 239000011425 bamboo Substances 0.000 claims abstract description 30
- 239000000654 additive Substances 0.000 claims abstract description 29
- 230000000996 additive effect Effects 0.000 claims abstract description 29
- PPBRXRYQALVLMV-UHFFFAOYSA-N Styrene Chemical compound C=CC1=CC=CC=C1 PPBRXRYQALVLMV-UHFFFAOYSA-N 0.000 claims abstract description 24
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 24
- 239000003112 inhibitor Substances 0.000 claims abstract description 13
- 238000006116 polymerization reaction Methods 0.000 claims abstract description 13
- 229920006337 unsaturated polyester resin Polymers 0.000 claims abstract description 12
- 239000002562 thickening agent Substances 0.000 claims abstract description 10
- 229920005989 resin Polymers 0.000 claims description 58
- 239000011347 resin Substances 0.000 claims description 58
- 238000003756 stirring Methods 0.000 claims description 46
- 239000000463 material Substances 0.000 claims description 27
- 238000007790 scraping Methods 0.000 claims description 13
- 230000008719 thickening Effects 0.000 claims description 13
- AZQWKYJCGOJGHM-UHFFFAOYSA-N 1,4-benzoquinone Chemical compound O=C1C=CC(=O)C=C1 AZQWKYJCGOJGHM-UHFFFAOYSA-N 0.000 claims description 6
- 239000000395 magnesium oxide Substances 0.000 claims description 6
- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 claims description 6
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical group [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 claims description 6
- 229920006395 saturated elastomer Polymers 0.000 claims description 5
- 239000011248 coating agent Substances 0.000 claims description 4
- 238000000576 coating method Methods 0.000 claims description 4
- CWPKTBMRVATCBL-UHFFFAOYSA-N 3-[1-[1-[(2-methylphenyl)methyl]piperidin-4-yl]piperidin-4-yl]-1h-benzimidazol-2-one Chemical group CC1=CC=CC=C1CN1CCC(N2CCC(CC2)N2C(NC3=CC=CC=C32)=O)CC1 CWPKTBMRVATCBL-UHFFFAOYSA-N 0.000 claims description 3
- 229920001225 polyester resin Polymers 0.000 claims description 3
- 239000004645 polyester resin Substances 0.000 claims description 3
- 229920002689 polyvinyl acetate Polymers 0.000 claims description 3
- 238000005096 rolling process Methods 0.000 claims description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 3
- XOOUIPVCVHRTMJ-UHFFFAOYSA-L zinc stearate Chemical group [Zn+2].CCCCCCCCCCCCCCCCCC([O-])=O.CCCCCCCCCCCCCCCCCC([O-])=O XOOUIPVCVHRTMJ-UHFFFAOYSA-L 0.000 claims description 3
- 238000000034 method Methods 0.000 claims description 2
- 239000002131 composite material Substances 0.000 abstract description 5
- 239000003677 Sheet moulding compound Substances 0.000 description 56
- 239000011521 glass Substances 0.000 description 14
- 230000005484 gravity Effects 0.000 description 14
- 239000011324 bead Substances 0.000 description 13
- 239000000945 filler Substances 0.000 description 13
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 12
- 229910000019 calcium carbonate Inorganic materials 0.000 description 6
- 239000002245 particle Substances 0.000 description 6
- 239000002994 raw material Substances 0.000 description 3
- 229920001169 thermoplastic Polymers 0.000 description 3
- 102000029749 Microtubule Human genes 0.000 description 2
- 108091022875 Microtubule Proteins 0.000 description 2
- 238000002485 combustion reaction Methods 0.000 description 2
- 238000011049 filling Methods 0.000 description 2
- 210000004688 microtubule Anatomy 0.000 description 2
- 239000012764 mineral filler Substances 0.000 description 2
- 238000002156 mixing Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000005191 phase separation Methods 0.000 description 2
- 238000003825 pressing Methods 0.000 description 2
- 239000002893 slag Substances 0.000 description 2
- 229920001187 thermosetting polymer Polymers 0.000 description 2
- 239000004416 thermosoftening plastic Substances 0.000 description 2
- 238000004056 waste incineration Methods 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 239000002956 ash Substances 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000011344 liquid material Substances 0.000 description 1
- 239000004005 microsphere Substances 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 239000006082 mold release agent Substances 0.000 description 1
- 150000002978 peroxides Chemical class 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 238000004886 process control Methods 0.000 description 1
- 239000010453 quartz Substances 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
Classifications
-
- 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
Abstract
The invention discloses a low-density SMC product and a preparation method thereof, relating to the technical field of composite materials, wherein the low-density SMC product comprises the following components in parts by weight: 13-15 parts of unsaturated polyester resin; 8-12 parts of a low-profile additive A; 1-2 parts of a low-shrinkage additive B; 1.5-2 parts of styrene; 0.5-1 part of a curing agent; 1.5-2 parts of an internal release agent; 1 part of polymerization inhibitor; 1.2-1.7 parts of a thickening agent; 25-38 parts of bamboo powder; 32-38 parts of glass fiber yarn.
Description
Technical Field
The invention relates to the technical field of composite materials, in particular to a low-density SMC product and a preparation method thereof.
Background
SMC is a Sheet Molding Compound (SMC) generally formed by mixing thermosetting unsaturated polyester resin, low shrinkage additive, peroxide curing agent, filler, thickening agent and polymerization inhibitor in a dispersion machine to form resin paste, then coating the resin paste on an upper layer of film and a lower layer of film by scraping, adding chopped glass fiber yarn in the middle, and thickening after the resin paste impregnates the glass fiber yarn. And (3) placing the SMC in a heated steel die, closing the die, pressurizing and curing to form the composite material product. The filler mainly plays roles of increasing viscosity, reducing curing shrinkage, reducing cost and the like in the SMC. The traditional filler applied to the common SMC is mineral powder filler such as calcium carbonate powder and quartz powder, and the calcium carbonate powder has a large specific gravity (the bulk specific gravity is 2.7-2.9), so that the specific gravity of the composite material product finally pressed is also large, and is generally 1.8-1.9. With the gradual improvement of lightweight requirements of materials in many application fields, in order to reduce the specific gravity of SMC products, the existing low-density SMC production technology generally adopts the steps of mixing a certain proportion of hollow glass beads (the average bulk specific gravity is about 0.3) into calcium carbonate powder, and adopting a two-component filling system of the calcium carbonate powder and the hollow glass beads, so that the specific gravity of the SMC mould pressing products can be reduced to 1.3-1.5. However, the addition of hollow glass microspheres also presents a number of problems to the SMC product. Firstly, the hollow glass beads are easily crushed by pressure during SMC mould pressing, so that the strength of a product is reduced, and fine gaps are formed on the surface of the product; secondly, when the surface of the molded product is polished, the hollow glass beads are easy to polish and break to leave micropores, and the surface of the molded product is very rough after being coated; the hollow glass beads are very expensive and are mainly produced by foreign enterprises, so that the production cost of the low-density SMC is high.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a low-density SMC product and a preparation method thereof, wherein natural bamboo powder is used for replacing a two-component filler of calcium carbonate powder and hollow glass beads to prepare the low-density SMC.
In order to achieve the above purposes, the technical scheme adopted by the invention is as follows: a low density SMC article comprising, in parts by weight: 13-15 parts of unsaturated polyester resin; 8-12 parts of a low-profile additive A; 1-2 parts of a low-shrinkage additive B; 1.5-2 parts of styrene; 0.5-1 part of a curing agent; 1.5-2 parts of an internal release agent; 1 part of polymerization inhibitor; 1.2-1.7 parts of a thickening agent; 25-38 parts of bamboo powder; 32-38 parts of glass fiber yarn.
On the basis of the technical scheme, the low-shrinkage additive A is saturated polyester resin.
On the basis of the technical scheme, the low-shrinkage additive B is PVAC.
On the basis of the technical scheme, the curing agent is TBPB.
On the basis of the technical scheme, the internal release agent is zinc stearate.
On the basis of the technical scheme, the polymerization inhibitor is prepared by dissolving 10% of p-benzoquinone in a styrene solution.
On the basis of the technical scheme, the thickening agent is magnesium oxide paste.
On the basis of the technical scheme, the specification of the bamboo powder is 700 meshes, and the water content is below 0.1%.
On the basis of the technical scheme, the glass fiber yarn is a chopped glass fiber yarn with the length of 25 mm.
The present invention also provides a process for preparing the above low density SMC article, comprising the steps of: s1, starting a stirrer, setting the rotating speed to be 500R/min, sequentially adding 13-15 parts of unsaturated polyester resin, 8-12 parts of low-shrinkage additive A, 1-2 parts of low-shrinkage additive B, 0.5-1 part of curing agent, 1.5-2 parts of internal release agent, 1.5-2 parts of styrene and 1 part of polymerization inhibitor into a stirring barrel while stirring, and stirring for 3 minutes after the addition is finished; after stirring, increasing the rotating speed of the stirrer to 700R/min, adding 25-38 parts of bamboo powder, increasing the stirring speed to 1000R/min after the stirring is finished, and stirring for 10-15 minutes; s2, adding 1.2-1.7 parts of thickening agent into the resin paste prepared in the step, stirring for 2 minutes at the rotating speed of 1000R/min, and finishing the preparation of the resin paste; s3, coating resin paste with the thickness of 1.8-2.0 mm on the upper layer bearing film and the lower layer bearing film through a material groove and a material scraping knife of SMC production equipment in a scraping mode, adding 32-38 parts of glass fiber yarns with the length of 25mm on the resin paste at the bottom layer, covering another layer of resin paste to form a sandwich sheet material of the resin paste, the glass fiber yarns and the resin paste, compacting through SMC production equipment to enable the resin to impregnate the glass fiber yarns, and then rolling; and S4, placing the produced coiled material into a thickening chamber, and thickening for 24-36 hours at the temperature of 35-45 ℃ to obtain a low-density SMC finished product filled with the bamboo powder.
The invention has the beneficial effects that:
1. according to the invention, natural bamboo powder is used as a filler of the low-density SMC instead of calcium carbonate powder and hollow glass beads, so that the effect of reducing the specific gravity of the SMC is achieved at the same level, and the specific gravity of the produced SMC is between 1.30 and 1.45.
2. The invention can improve the bonding strength between the filler and the resin in the SMC, thereby improving the strength of the SMC product. The combination between the mineral filler, the hollow glass beads and the resin is only the combination between the surface of the filler particles and the resin, the capillary microtubules of the original bamboo body are reserved in the bamboo powder particles, the resin is not only bonded with the surface of the bamboo powder particles, but also can enter the interior of the bamboo powder particles through the capillary microtubules of the bamboo powder particles, the bonding area between the filler particles and the resin is increased, the bonding strength between the filler and the resin is improved, and therefore the strength of an SMC product is improved.
3. The invention can improve the process control of the production link of the low-density SMC, and the material performance is more uniform and consistent. Because the specific gravity (0.3) of the hollow glass beads is greatly different from the specific gravity of the liquid unsaturated polyester resin and the low-shrinkage additive (both the specific gravity of the hollow glass beads and the specific gravity of the low-shrinkage additive are about 1.0), the hollow glass beads are easy to float upwards and separate out after the resin paste is stirred, and the phase separation is caused, so that the performance of the SMC material is uneven. The specific gravity (0.7-0.8) of the bamboo powder is close to that of the unsaturated polyester resin and the low-shrinkage additive, and the phenomenon of phase separation of the filler and the liquid material cannot occur.
4. The invention can reduce the raw material cost of the low-density SMC. The hollow glass beads for filling the low-density SMC are high in price, the raw material cost of the low-density SMC is calculated to be over 13 yuan/kg, the raw material cost can be controlled within 9 yuan/kg when the low-density SMC is filled with bamboo powder to reach the same specific gravity and performance, and the production cost is greatly reduced.
5. The invention can improve the recycling and treatment of the scrapped low-density SMC product. Since the SMC molded product is a thermosetting composite material product, and can not be recycled and granulated like thermoplastic plastics, the SMC molded product is basically treated by combustion power generation or landfill treatment at present. Mineral fillers and glass fiber yarns in common SMC (including low-density SMC filled with hollow glass beads) are not combustible, non-combustible components account for 65-70% of the weight of the SMC, and slag and ash generated during combustion are large, so that the reception intention of a waste incineration power plant is low. After the bamboo powder is used as the filler, the weight of the non-combustible components is reduced to 30-38% of that of SMC, the produced slag and ash content are greatly reduced, and the acceptance enthusiasm of a waste incineration power plant is greatly improved. The low-density SMC which is made by adopting the bamboo powder as the filler is easier to naturally decompose after being buried because the bamboo powder containing about 30 percent is more easily decomposed.
Detailed Description
The present invention will be described in further detail with reference to examples, which are illustrative of the present invention and are not to be construed as being limited thereto. The amount of the additive is limited only to facilitate the practice of the invention, and is not described to be outside the scope of the invention.
The embodiment of the invention provides a low-density SMC product, which comprises the following components in parts by weight: 13-15 parts of unsaturated polyester resin; 8-12 parts of a low-profile additive A; specifically, the low-shrinkage additive A is saturated polyester resin. 1-2 parts of a low-shrinkage additive B; specifically, the low profile additive B is PVAC. 1.5-2 parts of styrene; 0.5-1 part of a curing agent; specifically, the curing agent is TBPB. 1.5-2 parts of an internal release agent; specifically, the internal mold release agent is zinc stearate. 1 part of polymerization inhibitor; specifically, the polymerization inhibitor is prepared by dissolving 10% of p-benzoquinone in a styrene solution. 1.2-1.7 parts of a thickening agent; specifically, the thickener is magnesium oxide paste. 25-38 parts of bamboo powder; specifically, the bamboo powder is 700 meshes, and the water content is below 0.1%. 32-38 parts of glass fiber yarn. Specifically, the glass fiber yarn is a chopped glass fiber yarn with the length of 25 mm.
The present invention also provides a method for preparing the low density SMC article described above, comprising the steps of:
s1, starting a stirrer, setting the rotating speed to be 500R/min, sequentially adding 13-15 parts of unsaturated polyester resin, 8-12 parts of low-shrinkage additive A, 1-2 parts of low-shrinkage additive B, 0.5-1 part of curing agent, 1.5-2 parts of internal release agent, 1.5-2 parts of styrene and 1 part of polymerization inhibitor into a stirring barrel while stirring, and stirring for 3 minutes after the addition is finished; after stirring, increasing the rotating speed of the stirrer to 700R/min, adding 25-38 parts of bamboo powder, increasing the stirring speed to 1000R/min after the stirring is finished, and stirring for 10-15 minutes;
s2, adding 1.2-1.7 parts of thickening agent into the resin paste prepared in the step, stirring for 2 minutes at the rotating speed of 1000R/min, and finishing the preparation of the resin paste;
s3, coating resin paste with the thickness of 1.8-2.0 mm on the upper layer bearing film and the lower layer bearing film through a material groove and a material scraping knife of SMC production equipment in a scraping mode, adding 32-38 parts of glass fiber yarns with the length of 25mm on the resin paste at the bottom layer, covering another layer of resin paste to form a sandwich sheet material of the resin paste, the glass fiber yarns and the resin paste, compacting through SMC production equipment to enable the resin to impregnate the glass fiber yarns, and then rolling;
and S4, placing the produced coiled material into a thickening chamber, and thickening for 24-36 hours at the temperature of 35-45 ℃ to obtain a low-density SMC finished product filled with the bamboo powder.
The invention is further illustrated by the following three examples.
Example one
1. Starting the stirrer, setting the rotating speed to be 500R/min, sequentially adding 13 parts of unsaturated polyester resin, 10 parts of low-shrinkage additive A, 1.5 parts of low-shrinkage additive B, 0.5 part of curing agent, 1.5 parts of internal release agent, 2 parts of styrene and 1 part of polymerization inhibitor into a stirring barrel while stirring, and stirring for 3 minutes after the addition is finished. And after stirring, increasing the rotating speed of the stirrer to 700R/min, adding 37 parts of bamboo powder, increasing the stirring speed to 1000R/min after the stirring is finished, and stirring for 10-15 minutes.
2. Adding 1.5 components of magnesium oxide paste into the resin paste prepared in the step, stirring for 2 minutes at the rotating speed of 1000R/min, and finishing the preparation of the resin paste.
3. Resin paste with the thickness of 1.8-2.0 mm is coated on an upper layer bearing film and a lower layer bearing film through a material groove and a material scraping knife of SMC production equipment in a scraping mode, 32 parts of glass fiber yarns with the length of 25mm are added on the resin paste at the bottom layer, another layer of resin paste is covered, a sandwich sheet material of the resin paste, the glass fiber yarns and the resin paste is formed, and then the SMC production equipment is used for compacting, so that the glass fiber yarns are impregnated with the resin, and then the glass fiber yarns are rolled.
4. And (3) placing the produced coiled material into a thickening chamber, and thickening for 24-36 hours at the temperature of 35-45 ℃ to obtain a low-density SMC finished product filled with the bamboo powder.
Example two
1. Starting a stirrer, setting the rotating speed to be 500R/min, sequentially adding 14 parts of unsaturated polyester resin, 11 parts of saturated resin type low-shrinkage additive, 1.5 parts of thermoplastic low-shrinkage additive, 0.5 part of curing agent, 1.5 parts of internal release agent, 2 parts of styrene and 1 part of polymerization inhibitor into a stirring barrel while stirring, and stirring for 3 minutes after the addition is finished. And after stirring, increasing the rotating speed of the stirrer to 700R/min, adding 32 parts of 700-mesh bamboo powder, increasing the stirring speed to 1000R/min after the addition is finished, and stirring for 10-15 minutes.
2. Adding 1.5 components of magnesium oxide paste into the resin paste prepared in the step, stirring for 2 minutes at the rotating speed of 1000R/min, and finishing the preparation of the paste.
3. Resin paste with the thickness of 1.8-2.0 mm is coated on an upper layer bearing film and a lower layer bearing film through a material groove and a material scraping knife of SMC production equipment in a scraping mode, 35 parts of glass fiber yarns with the length of 25 are added on the resin paste at the bottom layer, another layer of resin paste is covered, a sandwich sheet material of the resin paste, the glass fiber yarns and the resin paste is formed, and then the SMC production equipment is used for compacting, so that the glass fiber yarns are impregnated with the resin, and then the glass fiber yarns are rolled.
4. And (3) placing the produced coiled material into a thickening chamber, and thickening for 24-36 hours at the temperature of 35-45 ℃ to obtain a low-density SMC finished product filled with the bamboo powder.
EXAMPLE III
1. Starting the stirrer, setting the rotating speed to be 500R/min, sequentially adding 14 parts of unsaturated polyester resin, 12 parts of saturated resin type low-shrinkage additive, 2 parts of thermoplastic low-shrinkage additive, 0.5 part of curing agent, 1.5 parts of internal release agent, 2 parts of styrene and 1 part of polymerization inhibitor into a stirring barrel while stirring, and stirring for 3 minutes after the addition is finished. And after stirring, increasing the rotating speed of the stirrer to 700R/min, adding 27.5 parts of 700-mesh bamboo powder, increasing the stirring speed to 1000R/min, and stirring for 10-15 minutes.
2. Adding 1.5 components of magnesium oxide paste into the resin paste prepared in the step, stirring for 2 minutes at the rotating speed of 1000R/min, and finishing the preparation of the paste.
3. Resin paste with the thickness of 1.8-2.0 mm is coated on an upper layer bearing film and a lower layer bearing film through a material groove and a material scraping knife of SMC production equipment in a scraping mode, 38 parts of glass fiber yarns with the length of 25mm are added on the resin paste at the bottom layer, another layer of resin paste is covered, a sandwich sheet material of the resin paste, the glass fiber yarns and the resin paste is formed, and then the SMC production equipment is used for compacting, so that the glass fiber yarns are impregnated with the resin, and then the glass fiber yarns are rolled.
4. And (3) placing the produced coiled material into a thickening chamber, and thickening for 24-36 hours at the temperature of 35-45 ℃ to obtain a low-density SMC finished product filled with the bamboo powder.
The detection data of the low-density SMC product prepared by the invention are as follows:
| unit of | Example one | Example two | Implementation III | |
| Density of | Kg/dm3 | 1.32 | 1.37 | 1.41 |
| Tensile strength | MPa | 103 | 117 | 124 |
| Bending strength | MPa | 135 | 147 | 165 |
| Flexural modulus | MPa | 7220 | 8350 | 9360 |
| Impact strength | KJ/m2 | 82 | 96 | 112 |
The present invention is not limited to the above-described embodiments, and it will be apparent to those skilled in the art that various modifications and improvements can be made without departing from the principle of the present invention, and such modifications and improvements are also considered to be within the scope of the present invention. Those not described in detail in this specification are within the skill of the art.
Claims (10)
1. A low density SMC article characterized by comprising, in parts by weight:
2. the low density SMC article of claim 1 wherein: the low-shrinkage additive A is saturated polyester resin.
3. The low density SMC article of claim 1 wherein: the low profile additive B is PVAC.
4. The low density SMC article of claim 1 wherein: the curing agent is TBPB.
5. The low density SMC article of claim 1 wherein: the internal release agent is zinc stearate.
6. The low density SMC article of claim 1 wherein: the polymerization inhibitor is prepared by dissolving 10 percent of p-benzoquinone in a styrene solution.
7. The low density SMC article of claim 1 wherein: the thickening agent is magnesium oxide paste.
8. The low density SMC article of claim 1 wherein: the specification of the bamboo powder is 700 meshes, and the water content is below 0.1%.
9. The low density SMC article of claim 1 wherein: the glass fiber yarn is a chopped glass fiber yarn with the length of 25 mm.
10. A method for making a low density SMC article as in any one of claims 1 to 9 comprising the steps of:
s1, starting a stirrer, setting the rotating speed to be 500R/min, sequentially adding 13-15 parts of unsaturated polyester resin, 8-12 parts of low-shrinkage additive A, 1-2 parts of low-shrinkage additive B, 0.5-1 part of curing agent, 1.5-2 parts of internal release agent, 1.5-2 parts of styrene and 1 part of polymerization inhibitor into a stirring barrel while stirring, and stirring for 3 minutes after the addition is finished; after stirring, increasing the rotating speed of the stirrer to 700R/min, adding 25-38 parts of bamboo powder, increasing the stirring speed to 1000R/min after the stirring is finished, and stirring for 10-15 minutes;
s2, adding 1.2-1.7 parts of thickening agent into the resin paste prepared in the step, stirring for 2 minutes at the rotating speed of 1000R/min, and finishing the preparation of the resin paste;
s3, coating resin paste with the thickness of 1.8-2.0 mm on the upper layer bearing film and the lower layer bearing film through a material groove and a material scraping knife of SMC production equipment in a scraping mode, adding 32-38 parts of glass fiber yarns with the length of 25mm on the resin paste at the bottom layer, covering another layer of resin paste to form a sandwich sheet material of the resin paste, the glass fiber yarns and the resin paste, compacting through SMC production equipment to enable the resin to impregnate the glass fiber yarns, and then rolling;
and S4, placing the produced coiled material into a thickening chamber, and thickening for 24-36 hours at the temperature of 35-45 ℃ to obtain a low-density SMC finished product filled with the bamboo powder.
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104015458A (en) * | 2014-06-12 | 2014-09-03 | 扬州市康宇实业有限公司 | Preparation method of high-strength amino modified SMC (Sheet Molding Compound) |
| CN106519620A (en) * | 2016-09-29 | 2017-03-22 | 常州日新模塑科技有限公司 | Preparation method for SMC composite material |
| CN111171540A (en) * | 2020-02-03 | 2020-05-19 | 武汉理工大学 | Low-density low-pressure sheet molding compound and preparation method thereof |
-
2022
- 2022-05-05 CN CN202210477640.6A patent/CN114685967B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104015458A (en) * | 2014-06-12 | 2014-09-03 | 扬州市康宇实业有限公司 | Preparation method of high-strength amino modified SMC (Sheet Molding Compound) |
| CN106519620A (en) * | 2016-09-29 | 2017-03-22 | 常州日新模塑科技有限公司 | Preparation method for SMC composite material |
| CN111171540A (en) * | 2020-02-03 | 2020-05-19 | 武汉理工大学 | Low-density low-pressure sheet molding compound and preparation method thereof |
Non-Patent Citations (1)
| Title |
|---|
| 黄世国等: "竹粉/不饱和聚酯复合材料力学性能与断面图像特征", 农业工程学报, vol. 28, pages 276 * |
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