CN115418048B - Anti-shrinkage polypropylene furniture board composite material and preparation method thereof - Google Patents
Anti-shrinkage polypropylene furniture board composite material and preparation method thereof Download PDFInfo
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- CN115418048B CN115418048B CN202211065097.5A CN202211065097A CN115418048B CN 115418048 B CN115418048 B CN 115418048B CN 202211065097 A CN202211065097 A CN 202211065097A CN 115418048 B CN115418048 B CN 115418048B
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- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L23/00—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
- C08L23/02—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers not modified by chemical after-treatment
- C08L23/10—Homopolymers or copolymers of propene
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Abstract
The invention provides an anti-shrinkage polypropylene furniture board composite material and a preparation method thereof, wherein the anti-shrinkage polypropylene furniture board composite material comprises the following raw materials: the modified mesoporous silica is obtained by grafting and modifying the mesoporous silica by dimethyl alkyl chlorosilane. According to the invention, the mesoporous silica is grafted and modified by the dimethyl alkyl chlorosilane, and the composite material containing the modified mesoporous silica has low shrinkage rate and small change rate of glossiness after thermal oxidation aging, and in addition, the impact performance of the composite material can be improved by matching the modified mesoporous silica with the organic elastomer.
Description
Technical Field
The invention belongs to the technical field of polypropylene composite materials, and particularly relates to an anti-shrinkage polypropylene furniture board composite material and a preparation method thereof.
Background
Polypropylene is a thermoplastic resin prepared by polymerizing propylene, and is a non-toxic, odorless, milky high crystalline polymer with a density of only 0.9-0.91g/cm 3 Is one of the lightest varieties in all plastics at present and is particularly stable to water, so that the plastic is widely applied to the fields of household appliances, furniture, automobile spare parts and the like.
With the improvement of living standard of people and the importance of China on infrastructure, furniture made of polypropylene has the highest occurrence rate in parks, stations and various indoor and outdoor casinos in recent years, and even in the furniture market of ordinary families, furniture made of polypropylene has become popular and has a place. The polypropylene furniture mainly comprises various shapes of light chairs, stools, simple tables, containers, bookshelf and the like. The product is popular with people because of beautiful appearance, low cost, light weight, novel shape, and has the characteristics of moisture resistance, mildew resistance and long service life compared with wooden furniture when being used outdoors.
The polypropylene has good formability, the integral furniture or furniture plate components (drawers, brackets, side plates and the like) of the polypropylene are all formed by injection molding, the material temperature is generally controlled between 180 ℃ and 240 ℃, but the shrinkage rate is large (1-2.5%), the wall thickness product is easy to sink, the temperature of the injection molding die is strictly controlled by cooling water provided by a special refrigerator, and after the product is taken out by opening the die, shaping measures are also needed to prevent shrinkage deformation, namely, the product is fixedly placed for a period of time by a special fixing frame, so that the production efficiency is greatly reduced, and the labor consumption is increased.
Patent CN201310292084.6 discloses a modified polypropylene material with low molding shrinkage and no warp deformation and a preparation method thereof, wherein the modified polypropylene material comprises the following components in percentage by mass: 50 to 55 percent of polypropylene, 25 to 30 percent of filler, 5 to 10 percent of glass fiber, 3 to 8 percent of shrinkage regulator, 3 to 8 percent of elastomer, 0.5 to 1 percent of coupling agent, 0.4 to 1 percent of dispersing agent and 0.2 to 0.5 percent of antioxidant; the filler is a composition of hydrated magnesium silicate and light calcium carbonate, the relative density of the hydrated magnesium silicate is 2.7-2.8 g/cm < 3 >, and the particle size is 3000-8000 meshes; the relative density of the light calcium carbonate is 2.7-2.9 g/cm < 3 >, and the particle size is 10000-30000 meshes; patent CN201810301788.8 discloses a low-shrinkage polypropylene material and a preparation method thereof, 17-40 parts of polypropylene homopolymer, 25-40 parts of polypropylene copolymer, 3-8 parts of calcium carbonate, 12-17 parts of talcum powder, 8-10 parts of magnesium hydroxide, 3-6 parts of metallocene linear low-density polyethylene, 4-8 parts of toughening agent, 0.3-0.6 part of antioxidant, 0.3-0.7 part of dispersing agent and 0.3-0.5 part of anti-dripping agent.
A large amount of inorganic filler is used in the technology, and the problem of large shrinkage rate of polypropylene can be solved by utilizing the functions of reducing the crystallinity of PP and changing the structural form of PP without shrinkage of the inorganic filler. While this technique solves the problem of large shrinkage, it also causes another problem: because inorganic filler has strong polarity and high surface energy, and polypropylene is a typical nonpolar material, even if a coupling agent or a solubilizer is arranged in a system to improve interface interaction force, migration of the filler under high temperature condition can not be reduced, and excessive saturation of the filler under the surface is caused to generate precipitation, so that the surface is rough, color spots and color lines are generated, and the hand feeling and visual effect are poor. In conclusion, the polypropylene-based furniture material with excellent shrinkage resistance and small change of glossiness after high-temperature aging is developed, and has important significance in improving production efficiency, saving manpower and material resources and adapting to more and more extreme high-temperature weather.
Disclosure of Invention
In order to solve the technical problems, the invention provides an anti-shrinkage polypropylene furniture board composite material and a preparation method thereof, and the composite material containing the modified mesoporous silica has lower shrinkage rate and smaller change rate of high glossiness after high-temperature aging, and mesoporous silica is grafted and modified by dimethyl alkyl chlorosilane to obtain a filler with good compatibility with polypropylene.
In order to achieve the above purpose, the present invention adopts the following technical scheme:
the shrinkage-resistant polypropylene furniture board composite material comprises the following raw materials: the modified mesoporous silica is obtained by grafting and modifying mesoporous silica through dimethyl alkyl chlorosilane.
Further, the shrinkage-resistant polypropylene furniture board composite material comprises the following raw materials in parts by weight: 60-80 parts of polypropylene, 5-10 parts of organic elastomer, 10-20 parts of modified mesoporous silica, 5-10 parts of organic montmorillonite and 3-5 parts of lubricant, wherein the weight of the dimethyl alkyl chlorosilane is 5-10 times of that of the mesoporous silica; the number of carbon atoms of the hydrocarbon group is 6 to 18, preferably 10 to 18.
According to the invention, the compatibility of the mesoporous silica is greatly improved by utilizing the dimethyl alkyl chlorosilane to graft and modify the mesoporous silica, the modified mesoporous silica can be completely soaked by the polypropylene during melt processing, a polypropylene chain segment moves into a hole on the mesoporous silica by heating, complex entanglement and entanglement are generated between a polypropylene molecule and the mesoporous silica, the migration of the modified mesoporous silica can be reduced, and the migration of other fillers can be blocked. Therefore, the number of the alkyl carbon atoms on the dimethyl alkyl chlorosilane and the dosage of the dimethyl alkyl chlorosilane are strictly limited, and too little or too much is unfavorable for the stable entanglement of the polypropylene molecular chain segment or other molecular chain segments in the system and mesoporous silica.
The inventor finds that the impact performance of the composite material can be improved by using the modified mesoporous silica and the organic elastomer in a matched manner, and supposedly, although the mesoporous silica is provided with mesopores, the impact strength is reduced due to the fact that the mesoporous silica is easy to collapse under stress, the modified mesoporous silica is embedded into mesopores due to the fact that polarities of the modified mesoporous silica and the organic elastomer are close, and the surrounding phase structure of the mesoporous silica is changed in a direction favorable for the impact performance.
The average grain diameter of the mesoporous silica is 0.2-0.5 mu m, and the specific surface area is 200-600m 2 And/g, the average pore diameter is 2nm-10nm.
The particle size of the organic montmorillonite is 1-10 μm, the interlayer spacing is 1-4nm, and the thickness-to-diameter ratio is 100-500, preferably 150-300.
The organic montmorillonite is sodium montmorillonite which is subjected to organic treatment of mono-long chain alkyl quaternary ammonium salt, and the treatment method comprises one of solid phase treatment or wet treatment, preferably wet treatment.
The organic montmorillonite can be purchased or self-made, namely, water is used as a dispersion medium, and the self-made organic montmorillonite can be used for mineral protection and utilization by referring to the influence of reaction proportion on the interlayer structure of the nano organic montmorillonite of Zhang Kun and the like, 2007 (3): 4.
Specifically, if the organically modified montmorillonite is self-made, the organically modified montmorillonite can be prepared by the following steps:
dispersing sodium montmorillonite in water to obtain dispersion, heating and maintaining the temperature, adding mono-long chain alkyl quaternary ammonium salt, stirring to react, suction filtering, washing, drying and grinding to obtain the organic modified montmorillonite.
The solid-liquid ratio of the montmorillonite dispersion liquid is 3-5:300, the dosage of the mono-long chain alkyl quaternary ammonium salt is 35-65wt% of montmorillonite, the washing is carried out for 3 times by using deionized water and ethanol alternately, the temperature is raised to 60-90 ℃, the drying is carried out for 3-5 hours in a drying box at 60-80 ℃, the stirring rotating speed is 200-400r/min, the stirring reaction time is 1-3 hours, and the grinding is carried out until the particle size is 1-10 mu m.
The mono-long chain alkyl quaternary ammonium salt is selected from one or a combination of two or more of octadecyl trimethyl ammonium chloride, octadecyl benzyl dimethyl ammonium chloride, hexadecyl trimethyl ammonium bromide, hexadecyl trimethyl ammonium chloride, hexadecyl benzyl dimethyl ammonium chloride and dodecyl benzyl dimethyl ammonium chloride.
The dimethyl alkyl chlorosilane is selected from one or a combination of two or more of dimethyl hexyl chlorosilane, dimethyl octyl chlorosilane, dimethyl decyl chlorosilane, dodecyl dimethyl chlorosilane, n-triacontyl dimethyl chlorosilane, dimethyl tetradecyl chlorosilane, hexadecyl dimethyl chlorosilane and dimethyl octadecyl chlorosilane.
The modified mesoporous silica is prepared by a method comprising the following steps:
1) Activating mesoporous silica at high temperature;
2) Dispersing the mesoporous silica obtained in the step 1) into an organic solvent, adding dimethyl alkyl chlorosilane, introducing nitrogen, heating and keeping the temperature, performing airtight reflux reaction, filtering, washing and vacuum drying to obtain the modified mesoporous silica.
The Gao Wenhuo conversion condition in the step 1) is 250-300 ℃ for 12-24 hours;
the organic solvent in the step 2) is selected from one or a combination of two or more of toluene, diethyl ether, chloroform, methylene dichloride and isopropyl ether; the temperature is raised to 60-100 ℃, the reaction time is 12-36h, the detergent is one or the combination of ethanol and acetone, the vacuum drying temperature is 60-100 ℃, the vacuum degree is 0.01-0.1MPa, and the time is 6-24h.
The mesoporous silica has high concentration of Si-OH on the surface, and the groups can be used as grafting positioning points, but not all Si-OH are active, and most of the Si-OH are combined in a hydrogen bond mode, so that the mesoporous silica needs to be activated at high temperature, and the original structure of the grafted mesoporous silica can be maintained without obvious change. The grafted dimethyl alkyl chlorosilane can not only improve the hydrophobicity of mesoporous silica and prevent the skeleton from hydrolysis and improve the stability, but also is beneficial to adsorbing other molecules, groups and chain segments with the polarity similar to that of the mesoporous silica.
The melt index of the organic elastomer is 5-20g/10min.
The organic elastomer type is selected from one or a combination of two or more of ethylene-octene copolymer, ethylene propylene diene monomer, ethylene-butene copolymer and styrene-butadiene-styrene block copolymer. Preferably, the organic elastomer is an ethylene-octene copolymer.
The melt index of the polypropylene is 0.3-2g/10min.
Preferably, the polypropylene is a propylene and alpha-olefin copolymer polypropylene, wherein the content of the alpha-olefin is 1-10wt%, and the alpha-olefin comprises one or a combination of two of ethylene, butylene and pentene, preferably ethylene.
The lubricant is not particularly limited and may be any lubricant commonly used in the art including, but not limited to, one or a combination of two or more of calcium stearate, zinc stearate, magnesium stearate, barium stearate, vinyl bis-stearamide, pentaerythritol stearate, oleamide.
The invention also provides a preparation method of the shrinkage-resistant polypropylene furniture board composite material, which comprises the following steps:
adding the polypropylene, the organic elastomer, the modified mesoporous silica, the organic montmorillonite and the lubricant into a mixer, uniformly mixing, adding into a double-screw extruder, extruding and granulating, and finally performing injection molding through an injection molding machine.
The extrusion process of the double-screw extruder comprises the following steps: the extrusion temperature is 190-230 ℃, and the screw rotating speed is 100-130r/min.
The injection molding machine is a single-screw injection molding machine, and the injection molding process of the injection molding machine is as follows: the rotating speed of the screw is 25-40mm/s, the temperature of the die is 20-30 ℃, the injection temperature is 190-220 ℃, the injection pressure is 48-60MPa, the holding pressure is 35-45MPa, the holding time is 5-15s, and the cooling time is 30-45s.
The thickness of the injection molding piece is 3-5mm.
Compared with the prior art, the invention has the beneficial effects that:
according to the invention, the mesoporous silica is grafted and modified by using the dimethyl alkyl chlorosilane to obtain the filler with good compatibility with polypropylene, and the composite material containing the modified mesoporous silica has low shrinkage and small change of glossiness after high-temperature aging.
The inventor finds that the impact performance of the composite material can be improved by using the modified mesoporous silica and the organic elastomer in a matching way, and supposedly, although the mesoporous silica is provided with mesopores, the impact strength is reduced due to the fact that stress is easy to collapse, the modified mesoporous silica is close to the polarity of the organic elastomer, so that an elastomer chain segment is embedded into the mesopores, and the structure of the surrounding phases of the mesoporous silica is changed in the direction favorable for the impact performance.
The invention does not need shaping measures after the mould is opened to take out the product, greatly improves the production efficiency and saves manpower and material resources.
Detailed Description
The invention is further illustrated below in connection with specific examples, but is not limited to the disclosure. Unless otherwise specified, "parts" are parts by weight in the examples of the present invention. All reagents used are those commercially available in the art.
The polypropylene powder is purchased from a macro-power chemical plant of a Luoyang petrochemical general plant, the melt index is 0.3g/10min, and the ethylene content is 7wt%;
ethylene octene copolymer (POE) is available from DOW chemical company, usa under the trademark ENGAGE 8130;
sodium-based montmorillonite was purchased from (klamate) Shanghai spectral vibro biotechnology limited;
octadecyl trimethyl ammonium chloride was purchased from komiou;
mesoporous silica was obtained from Shanghai scrupulously and respectfully sensitive biotechnology Co., ltd, and had an average particle diameter of 0.45 μm and a specific surface area of 330m 2 G, average pore size 8.7nm;
the fine calcium carbonate is purchased from Hebei Cairii building materials Co., ltd, and has an average particle size of 0.45 μm;
talc powder was purchased from Xufeng powder, with an average particle size of 3.5 μm.
Preparation of organic montmorillonite
Preparation example a1
Dispersing 5 parts of sodium montmorillonite in 300 parts of water to prepare a dispersion liquid, regulating the pH to 7, heating to 60 ℃ and keeping the temperature constant, adding 2.5 parts of octadecyl trimethyl ammonium chloride, stirring for reaction for 3 hours at 400r/min, carrying out suction filtration, alternately washing for 3 times by using deionized water and ethanol, drying in a vacuum drying oven at 60 ℃ for 3 hours, and grinding to the particle size of 3.7 mu m to obtain the organic modified montmorillonite.
Preparation of shrinkage-resistant polypropylene-based furniture material
Preparation example b1
1) Activating mesoporous silica at 250 ℃ for 12 hours;
2) Dispersing 10 parts of mesoporous silica obtained in the step 1) into 180 parts of toluene, adding 100 parts of dimethyl octadecyl chlorosilane, introducing nitrogen, heating to 80 ℃ and keeping the temperature, sealing and refluxing for reaction for 24 hours, filtering, washing with ethanol, and vacuum drying at 100 ℃ and 0.1MPa for 24 hours to obtain the modified mesoporous silica.
Preparation example b2
The remainder was the same as in preparation example b1 except that dimethyloctadecylchlorosilane was used in an amount of 50 parts.
Preparation example b3
The remainder was the same as in preparation example b1, except that dimethyldecylchlorosilane was used instead of dimethyloctadecylchlorosilane.
Preparation example b4
The remainder was the same as in preparation example b1, except that dimethylhexyl chlorosilane was used instead of dimethyloctadecylchlorosilane.
Preparation example b5
The remainder was the same as in preparation example b1 except that dimethyloctadecylchlorosilane was used in an amount of 150 parts.
Preparation example b6
The remainder was the same as in preparation example b1 except that dimethyloctadecylchlorosilane was used in an amount of 40 parts.
Preparation of anti-shrinkage polypropylene furniture board composite material
Example 1
60 parts of polypropylene, 5 parts of POE, 20 parts of modified mesoporous silica prepared in preparation example b1, 5 parts of organic montmorillonite prepared in preparation example a1 and 5 parts of zinc stearate are added into a mixer to be uniformly mixed, pelleting is carried out under the following extrusion process conditions of a double screw extruder, then injection molding is carried out under the following injection process conditions, and a plate with the thickness of 100mm multiplied by 5mm is injection molded.
The extrusion process of the JSH30 double-screw extruder of Nanjing rubber and plastic mill comprises the following steps: the temperature of the five temperature areas is 190 ℃,200 ℃, 210 ℃, 220 ℃, 230 ℃, the temperature of the machine head is 225 ℃ and the rotating speed of the screw is 120r/min;
the injection molding process of the TFV4-35 single screw injection molding machine (the heating temperature area is modified to be 5) comprises the following steps: the rotation speed of the screw is 25mm/s, the temperature of the die is 23 ℃, the temperature of five temperature areas of the injection molding machine is 190 ℃,200 ℃, 210 ℃, 220 ℃, the injection pressure is 55MPa, the holding pressure is 40MPa, the holding time is 10s, and the cooling time is 30s.
Examples 2 to 6
The remainder was the same as in example 1, except that the modified mesoporous silica used was prepared corresponding to preparation examples b2 to b6, respectively.
Example 7
The remainder was the same as in example 1 except that 10 parts of modified mesoporous silica was used.
Example 8
The remainder was the same as in example 1 except that POE was used in an amount of 10 parts.
Comparative example 1
The remainder was the same as in example 1, except that the modified mesoporous silica was replaced with mesoporous silica.
Comparative example 2
The remainder was the same as in example 1, except that talc having an average particle diameter of 3.5 μm was used instead of the organic montmorillonite, and fine calcium carbonate having an average particle diameter of 0.45 μm was used instead of the mesoporous silica.
Comparative example 3
The other points are the same as in example 1, except that POE is not used in the system.
The following performance tests were carried out on the sheets prepared in examples 1 to 8 and comparative examples 1 to 3, and the results are shown in Table 1:
shrinkage ratio: the measurement was carried out with reference to the measurement of shrinkage of thermoplastic injection molding of standard GB/T15585-1995, with axial referring to the direction parallel to the flow and radial referring to the diameter.
Impact properties: the measurement is carried out with reference to the measurement of the impact strength of the plastic cantilever beam of the standard GB/T1843-2008.
Thermal oxidative aging: and (3) referring to a standard GB/T7141-2008 plastic thermal aging test method, performing thermal oxidation aging in a constant temperature oven at 120 ℃ for 500 hours, taking out, referring to a standard GB/T8807-1988 plastic specular gloss test method, and calculating the change rate of the gloss before and after the thermal oxidation aging.
TABLE 1
The table shows that the modified mesoporous silica prepared by the invention has the obvious effect of reducing the shrinkage of the composite material, has better compatibility with other substances in a composite material system, and has smaller change of glossiness after the prepared plate is aged at high temperature.
In addition, the impact strength test results in the table show that the impact performance of the composite material can be improved by the combination of the modified mesoporous silica and the organic elastomer, and the assumption is that the impact strength is reduced due to the fact that the mesoporous silica is provided with mesopores and is easy to collapse under stress, but the elastomer chain segments are embedded into the mesopores due to the fact that the polarity of the modified mesoporous silica is close to that of the organic elastomer, so that the structure of the surrounding phases of the mesoporous silica is changed in the direction favorable for the impact performance.
The invention does not need shaping measures after the mould is opened to take out the product, greatly improves the production efficiency and saves manpower and material resources.
The foregoing detailed description is directed to one of the possible embodiments of the present invention, which is not intended to limit the scope of the invention, but is to be accorded the full scope of all such equivalents and modifications so as not to depart from the scope of the invention.
Claims (9)
1. The shrinkage-resistant polypropylene furniture board composite material is characterized by comprising the following raw materials in parts by weight: 60-80 parts of polypropylene, 5-10 parts of organic elastomer, 10-20 parts of modified mesoporous silica, 5-10 parts of organic montmorillonite and 3-5 parts of lubricant;
the organic elastomer is an ethylene-octene copolymer;
the modified mesoporous silica is obtained by grafting and modifying mesoporous silica by dimethyl alkyl chlorosilane, and the weight of the dimethyl alkyl chlorosilane is 5-10 times of that of the mesoporous silica;
the dimethyl alkyl chlorosilane is selected from one or more than two of dimethyl hexyl chlorosilane, dimethyl octyl chlorosilane, dimethyl decyl chlorosilane, dodecyl dimethyl chlorosilane, n-triacontyl dimethyl chlorosilane, dimethyl tetradecyl chlorosilane, hexadecyl dimethyl chlorosilane and dimethyl octadecyl chlorosilane.
2. The shrinkage-resistant polypropylene furniture board composite material according to claim 1, wherein the mesoporous silica has an average particle diameter of 0.2-0.5 μm and a specific surface area of 200-600m 2 And/g, the average pore diameter is 2nm-10nm.
3. The shrink resistant polypropylene furniture board composite of claim 1, wherein the modified mesoporous silica is prepared by a process comprising the steps of:
1) Activating mesoporous silica at high temperature;
2) Dispersing the mesoporous silica obtained in the step 1) into an organic solvent, adding dimethyl alkyl chlorosilane, introducing nitrogen, heating and keeping the temperature, performing airtight reflux reaction, filtering, washing and vacuum drying to obtain the modified mesoporous silica.
4. The shrinkage-resistant polypropylene furniture board composite material according to claim 1, wherein the organic montmorillonite has a particle size of 1-10 μm, an interlayer spacing of 1-4nm, and a thickness-to-diameter ratio of 100-500; the organic montmorillonite is sodium montmorillonite which is subjected to organic treatment of single long-chain alkyl quaternary ammonium salt, and the treatment method comprises one of solid-phase treatment or wet treatment; the mono-long chain alkyl quaternary ammonium salt is selected from one or more than two of octadecyl trimethyl ammonium chloride, octadecyl benzyl dimethyl ammonium chloride, hexadecyl trimethyl ammonium bromide, hexadecyl trimethyl ammonium chloride, hexadecyl benzyl dimethyl ammonium chloride and dodecyl benzyl dimethyl ammonium chloride.
5. The shrink resistant polypropylene furniture board composite of claim 1, wherein said organic elastomer has a melt index of 5 to 20g/10min.
6. The shrink resistant polypropylene furniture board composite of claim 1, wherein said polypropylene has a melt index of 0.3 to 2g/10min; the polypropylene is propylene and alpha-olefin copolymerized polypropylene, wherein the content of the alpha-olefin is 1-10wt%, and the alpha-olefin comprises one or two of ethylene, butylene and pentene.
7. The shrink resistant polypropylene furniture board composite of claim 6, wherein said α -olefin is ethylene.
8. A method for preparing the shrinkage-resistant polypropylene furniture board composite material as claimed in any one of claims 1 to 7, comprising the steps of:
adding the polypropylene, the organic elastomer, the modified mesoporous silica, the organic montmorillonite and the lubricant into a mixer, uniformly mixing, adding into a double-screw extruder, extruding and granulating, and finally performing injection molding through an injection molding machine.
9. The method for preparing the shrinkage-resistant polypropylene furniture board composite material as claimed in claim 8, wherein the extrusion process of the twin-screw extruder is as follows: the extrusion temperature is 190-230 ℃, and the screw rotating speed is 100-130r/min; the injection molding machine is a single-screw injection molding machine, and the injection molding process of the injection molding machine is as follows: the rotating speed of the screw is 25-40mm/s, the temperature of the die is 20-30 ℃, the injection temperature is 190-220 ℃, the injection pressure is 48-60MPa, the holding pressure is 35-45MPa, the holding time is 5-15s, and the cooling time is 30-45s; the thickness of the injection molding piece is 3-5mm.
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| CN102476803A (en) * | 2010-11-29 | 2012-05-30 | 国家纳米科学中心 | Surface-modified ordered mesoporous silicon dioxide composite material and its preparation method |
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