CN108485066B - Environment-friendly low-odor polypropylene composite material for vehicles and preparation method thereof - Google Patents
Environment-friendly low-odor polypropylene composite material for vehicles and preparation method thereof Download PDFInfo
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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 discloses an environment-friendly low-odor polypropylene composite material, which comprises the following formula components in parts by weight: 44-70 parts of polypropylene, 15-40 parts of layered silicate mineral filler, 10-20 parts of toughening agent, 0.1-1 part of antioxidant and 0.1-1 part of stabilizer. The method comprises two steps, wherein firstly, polypropylene and the layered silicate mineral filler are mixed and added into a double-screw extruder for extrusion granulation to obtain modified polypropylene master batches, and secondly, the modified polypropylene master batches, the toughening agent, the antioxidant and the stabilizer are added into the double-screw extruder for secondary extrusion granulation. The polypropylene composite material has the characteristics of low odor, low VOC and balanced strength and toughness, and the preparation method has simple process and easy implementation and is suitable for large-scale production.
Description
Technical Field
The invention relates to the field of high polymer materials, in particular to an environment-friendly low-odor polypropylene material for vehicles and a preparation method thereof.
Background
The polypropylene composite material has the advantages of low density, flexibility resistance, chemical corrosion resistance, good insulation, environmental protection, easy processing, low price, recoverability, good mechanical property and the like, so the polypropylene composite material has wide application in the field of automobiles. At present, polypropylene composite materials are used as materials with the largest use amount of automotive interior parts, monomer residues in the synthesis process, and Volatile Organic Compounds such as hydrocarbons, aldehydes and ketones and the like are generated by decomposition of additives and photo-thermal degradation of materials added in the processing process, so that the problem of air pollution in automobiles is serious, VOC (Volatile Organic Compounds) and pungent odor are emitted to different degrees in the using process of automobiles, diseases in the aspects of skin, respiratory tract, nervous system and the like are caused, and the quality of air in automobiles and the body health of drivers and passengers are seriously influenced.
The method for reducing the odor and VOC of the polypropylene composite material in the prior art comprises the following three types, wherein the first type is vacuum extraction, high vacuum degree is kept in the extrusion process, and meanwhile, the cut particles are baked at high temperature to remove the odor and VOC. The second type is deodorant, air stripping agent and deodorant master batch which are prepared by adding low-boiling-point liquid into polypropylene, wherein a large amount of foam is generated in polypropylene melt in the extrusion process, and VOC carried by the low-boiling-point liquid is removed by utilizing vacuum devolatilization. The third type is to introduce gas adsorbents such as molecular sieve, silica gel, diatomite, zeolite, powdered rubber and the like into polypropylene.
However, the method for reducing the odor and VOC of the polypropylene composite material in the prior art has the defects of complex process, difficult large-scale production, agglomeration and the like, and seriously influences the mechanical property and the processing property. Although the problem of agglomeration of the fine gas modifier in the polypropylene can be solved by adopting the surface modifier, the organic solvent introduced in the process of using the surface modifier can cause the release of high odor and high VOC, and the odor and VOC grade of the polypropylene composite material are greatly improved. Therefore, the prior art is difficult to solve the problem that the polypropylene composite material emits VOC and pungent odor under the condition of ensuring the physical properties of the material.
Disclosure of Invention
The invention aims to overcome the defects of VOC emission and pungent odor of a polypropylene composite material in the prior art, and provides the polypropylene composite material and a preparation method thereof. The polypropylene composite material provided by the invention has the characteristics of low odor release and great environment-friendly advantage on the premise of ensuring the physical properties of the composite material, and is suitable for preparing interior decoration devices of vehicles.
In order to achieve the above purpose, the invention provides the following technical scheme:
the polypropylene composite material comprises the following formula components in parts by weight:
44-70 parts of polypropylene;
15-40 parts of a phyllosilicate mineral filler;
10-20 parts of a toughening agent;
0.1-1 part of antioxidant;
0.1-1 part of a stabilizer;
the phyllosilicate mineral filler is a mixture of two or more of talcum powder, kaolin, montmorillonite and mica.
The layered silicate mineral filler in the polypropylene composite material is talcum powder, kaolin, montmorillonite and mica, has larger interlayer spacing, strong micromolecule adsorption capacity and good dispersion performance, can reduce the smell and VOC of polypropylene, and can improve the performances of impact resistance, fatigue resistance, high-temperature creep resistance, dimensional stability and heat resistance of the polypropylene composite material. The polypropylene is filled with a mixture of two or more than two kinds of layered silicate mineral fillers, and the odor and VOC can be synergistically reduced by screening different filler types and proportions thereof.
Further, in the polypropylene composite material, the polypropylene is a homo-polymer or block copolymer, and the flow rate of the polypropylene melt is 0.5-60 g/10 min. The polypropylene raw material is tested under the conditions of 230 ℃ and 2.16kg, the melt flow rate of the polypropylene raw material is determined, and the proper polypropylene raw material is screened to ensure the quality of the composite material after processing and forming.
The homo-or block copolymer polypropylene has excellent moisture absorption resistance, acid and alkali corrosion resistance and dissolution resistance, and the homo-or block copolymer polypropylene has good strength and the block copolymer polypropylene has good impact resistance. Under the test conditions of 230 ℃ and 2.16kg, the melt flow rate is 0.5-60 g/10min, so that the selected raw materials can better adapt to the requirements of the processing technology, and the effect of improving the molding reliability and quality of the polypropylene composite material is achieved.
Further, the particle size of the phyllosilicate mineral filler is 5-100 microns.
In the invention, the particle size of the layered silicate mineral filler is controlled within the range of 5-100 microns, so that the comprehensive performance of the polypropylene composite material can be improved.
Further, the toughening agent is one or a mixture of more of ethylene propylene diene monomer, ethylene-octene copolymer, ethylene-butene copolymer and polyolefin block copolymer, and the melt flow rate is 0.2-10 g/10 min. The raw materials of the toughening agent are tested under the conditions of 230 ℃ and 2.16kg, and the high-quality toughening agent is screened, so that the better comprehensive performance of the composite material is realized.
The toughening agent plays a role in increasing the flexibility of the adhesive film layer, and achieves the effects of reducing the brittleness of the polypropylene composite material and increasing the toughness. One or more of ethylene propylene diene monomer, ethylene-octene copolymer, ethylene-butene copolymer and polyolefin block copolymer is/are selected to synergistically increase the toughness of the polypropylene composite material and the aging resistance and the processing performance of the polypropylene composite material, and the good fluidity of the ethylene-octene copolymer and the ethylene-butene copolymer can improve the dispersion effect of the filler. Under the test conditions of 190 ℃ and 2.16kg, the melt flow rate is 0.2-10 g/10min, so that the selected raw materials can better adapt to the requirements of the processing technology, and the effect of improving the comprehensive performance of the polypropylene composite material is achieved.
Further, the antioxidant is one or a mixture of several of an antioxidant 1010, an antioxidant 1076 and an antioxidant DLTP.
The antioxidant can delay or inhibit the polymer oxidation process, and achieves the effects of preventing the aging of the polymer and prolonging the service life of the polymer. The combination of the antioxidant 1010, the antioxidant 1076 and the antioxidant DLTP has synergistic effect.
Further, the stabilizer is a heat stabilizer and/or a light stabilizer.
The stabilizer in the invention can increase the stability of the mixture, and has the effects of slowing down the reaction, keeping chemical balance, reducing surface tension, preventing light, thermal decomposition or oxidative decomposition and the like.
Further, the light stabilizer is one or a mixture of more of V703, plastomer 5589 and UV-531.
The light stabilizer can shield or absorb the energy of ultraviolet rays, quench singlet oxygen, decompose hydroperoxide into inactive substances and the like, so that the possibility of photochemical reaction can be eliminated or slowed down by the high molecular polymer under the radiation of light, the photo-aging process is prevented or delayed, and the effect of prolonging the service life of the polypropylene composite material is achieved. The polypropylene composite material obtained by using V703, pinocembrol 5589 and UV-531 as light stabilizers has the characteristic of excellent weather resistance, and the simultaneous use of several light stabilizers has good synergistic effect.
The coating further comprises other additives, wherein the other additives are at least one of a lubricant, a solubilizer, a plasticizer and color master batches, and the lubricant is vinyl bis-stearamide.
Preferably, the solubilizer is PEG 40.
Preferably, the plasticizer is the plasticizer DEHP, the plasticizer DNOP, the plasticizer BBP.
The lubricant can reduce the friction resistance of the friction pair, and achieves the effect of slowing down the abrasion of the friction pair. The solubilizer is a surfactant with solubilizing ability, and can achieve the effect of increasing solubility. The plasticizer is a polymer material auxiliary agent widely used in industry, and can increase the flexibility of the polypropylene composite material. The color master batch enables the pigment to have better dispersibility in the polypropylene composite material, is beneficial to maintaining the chemical stability of the pigment and can achieve the effect of ensuring the color stability of the polypropylene composite material.
The invention also aims to provide a method for preparing the polypropylene composite material, so as to better ensure the mutual matching effect of various raw materials and achieve better comprehensive performance of the composite material.
A preparation method of a polypropylene composite material comprises the following preparation steps:
step one, adding polypropylene and phyllosilicate mineral filler into a stirrer together, and stirring uniformly for 8-15 min;
step two, melting and extruding the material uniformly mixed in the step one by using a double-screw extruder, controlling the extrusion temperature at 170-180 ℃ in a feeding section, 180-190 ℃ in a conveying section, 190-200 ℃ in a melting section, 180-190 ℃ in a machine head temperature, 20-40 ℃ in a water tank, cooling, granulating and drying to obtain modified polypropylene master batches;
step three, adding the modified polypropylene master batch obtained in the step two, a toughening agent, an antioxidant and a heat stabilizer into a stirrer together, and uniformly stirring for 8-15 min;
and step four, adding the mixture obtained in the step three into a double-screw extruder for secondary extrusion, controlling the extrusion temperature at 160-170 ℃ in a feeding section, 170-180 ℃ in a conveying section, 180-190 ℃ in a melting section, 180-190 ℃ in a machine head, 20-40 ℃ in a water tank, cooling, granulating and drying to obtain the polypropylene composite material.
The preparation method of the polypropylene composite material adopts secondary melt extrusion mixing, and the secondary processing technology can solve the problems of filler agglomeration and uneven dispersion, and simultaneously avoids the possibility of improving the material odor and VOC grade due to the introduction of organic solvent in the surface modification process, thereby achieving the technical effect of reducing pungent odor and VOC.
Furthermore, the rotating speed of the stirrer is 300-500 r/min, and the rotating speed of the screw is 25-50 r/min.
The rotating speed of the stirrer is 300-500 r/min, and the rotating speed of the screw is 25-50 r/min, so that the effect of improving the plasticizing quality can be achieved.
Compared with the prior art, the invention has the beneficial effects that:
(1) the invention fills the mixture of two or more than two kinds of layered silicate mineral fillers with high adsorption capacity into polypropylene, and achieves the effect of synergistically reducing odor and VOC by screening different filler species and the mixture ratio thereof.
(2) The preparation method of the composite material provided by the invention has the advantages that the unique secondary processing technology can solve the problems of filler agglomeration and uneven dispersion, and simultaneously, the possibility of bringing organic solvent in the surface modification process to further improve the odor and VOC grade of the material is avoided.
(3) The composite material provided by the invention can play a role in reducing the odor and simultaneously maintaining the comprehensive physical properties of polypropylene.
(4) The process is simple and efficient, and is suitable for large-scale production.
Detailed Description
Antioxidant 1010, also known as tetrakis [ beta- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionic acid]Pentaerythritol ester of the formula C73H108O12。
Antioxidant 1076, also known as octadecyl beta- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionate, having the molecular formula C35H62O3。
Antioxidant DLTP, also known as dilauryl thiodipropionate, with molecular formula C30H58O4S。
The light stabilizer V703 is a new generation of light stabilizing system, and is a polyolefin material such as polypropylene and polyolefin thermoplastic elastomer, which is under the brand name Cyanite and has the CAS number of 12356312.
Light stabilizer, plastizostable 5589, widely used in polyolefin, polypropylene, etc. and used as light stabilizer for modified thermoplastic elastomer material of vehicle polyolefin. The compound is recommended to be used together, and has good synergistic effect.
Light stabilizer UV-531, also known as 2-hydroxy-4-n-octyloxy-benzophenone; appearance: a yellowish crystalline flake; molecular weight: 326, and; melting temperature: 47 ℃ to 50 ℃ (maximum error of 1 ℃/reference).
The solubilizer is PEG 40, also called hydrogenated castor oil polyoxyethylene ether CO40。
The plasticizer DEHP is also called di (2-ethyl) hexyl phthalate, dioctyl phthalate and di (2-ethyl hexyl) phthalate, and the molecular formula is C6H4(CO2C8H17)2 [C24H38O4.]。
Plasticizer DNOP, also called di-n-octyl phthalate, with the molecular formula C24H38O4。
Plasticizer BBP, also called butyl benzyl phthalate, with molecular formula C19H20O4。
The present invention will be described in further detail with reference to test examples and specific embodiments. It should be understood that the scope of the above-described subject matter is not limited to the following examples, and any techniques implemented based on the disclosure of the present invention are within the scope of the present invention.
Example 1
(1) An environment-friendly low-odor polypropylene composite material comprises, by weight, 65 parts of polypropylene M2600R, 12 parts of talcum powder, 16 parts of toughening agent EPDM, 5 parts of kaolin, 7 parts of montmorillonite, 0.4 part of main antioxidant ZM-1010, 0.1 part of auxiliary antioxidant DLTP and 0.4 part of light stabilizer V703.
Example 2
(1) An environment-friendly low-odor polypropylene composite material comprises, by weight, 62 parts of polypropylene M2600R, 10 parts of talcum powder, 15 parts of toughener EPDM, 6 parts of kaolin, 6 parts of montmorillonite, 0.3 part of main antioxidant ZM-1010, 0.2 part of auxiliary antioxidant DLTP, 0.3 part of light stabilizer V703 and 0.2 part of lubricant EBS.
(2) Adding the polypropylene and the phyllosilicate mineral filler into a high-speed stirrer together according to the parts by weight, uniformly stirring, and stirring for 10min at the rotating speed of 300 r/min;
(3) and (3) melting and extruding the uniformly mixed material in the step (2) in a double-screw extruder with the length-diameter ratio of 25:1, cooling, granulating and drying. The rotation speed of the screw is 35r/min, the extrusion temperature from the feeding section to the machine head is respectively 170 ℃, 175 ℃, 180 ℃, 185 ℃, 195 ℃, 185 ℃ and 28 ℃ of the cooling water tank;
(4) and (4) adding the modified polypropylene master batch obtained in the step (3), a toughening agent, an antioxidant, a light stabilizer and other auxiliaries into a high-speed mixer, and mixing for 10min at the rotating speed of 300 r/min.
(5) And (3) adding the mixture obtained in the step (4) into a double-screw extruder for secondary extrusion, cooling, granulation and drying, wherein the rotating speed of a screw is 35r/min, the extrusion temperature is respectively 165 ℃, 175 ℃, 180 ℃, 185 ℃, 190 ℃, 190 ℃, 185 ℃ and 28 ℃ from the feeding section to the head.
Example 3
(1) An environment-friendly low-odor polypropylene composite material comprises, by weight, 66 parts of polypropylene M2600R, 10 parts of talcum powder, 15 parts of toughener EPDM, 6 parts of kaolin, 2 parts of montmorillonite, 0.3 part of main antioxidant ZM-1010, 0.2 part of auxiliary antioxidant DLTP, 0.3 part of light stabilizer V703 and 0.2 part of lubricant EBS.
(2) The same process as in example 2 was used to prepare an environmentally friendly-low odor polypropylene composite.
Example 4
(1) An environment-friendly low-odor polypropylene composite material comprises the following components, by weight, 69 parts of polypropylene M2600R, 10 parts of talcum powder, 15 parts of toughening agent EPDM, 5 parts of kaolin, 0.3 part of main antioxidant ZM-1010, 0.2 part of auxiliary antioxidant DLTP, 0.3 part of light stabilizer V703 and 0.2 part of lubricant EBS;
(2) the same process as in example 2 was used to prepare an environmentally friendly-low odor polypropylene composite.
Example 5
(1) An environment-friendly low-odor polypropylene composite material comprises the following components, by weight, 56 parts of polypropylene M2600R, 15 parts of talcum powder, 15 parts of toughening agent EPDM, 8 parts of kaolin, 5 parts of montmorillonite, 0.3 part of main antioxidant ZM-1010, 0.2 part of auxiliary antioxidant DLTP, 0.3 part of light stabilizer V703 and 0.2 part of lubricant EBS;
the same process as in example 2 was used to prepare an environmentally friendly-low odor polypropylene composite.
Example 6
(1) An environment-friendly low-odor polypropylene composite material comprises, by weight, 59 parts of polypropylene M2600R, 10 parts of talcum powder, 15 parts of toughener EPDM (ethylene-propylene-diene monomer), 5 parts of kaolin, 10 parts of montmorillonite, 0.3 part of main antioxidant ZM-1010, 0.2 part of auxiliary antioxidant DLTP, 0.3 part of light stabilizer V703 and 0.2 part of lubricant EBS;
(2) the same process as in example 2 was used to prepare an environmentally friendly-low odor polypropylene composite.
Example 7
(1) An environment-friendly low-odor polypropylene composite material comprises the following components, by weight, 54 parts of polypropylene M2600R, 15 parts of talcum powder, 20 parts of toughener EPDM, 2 parts of kaolin, 8 parts of montmorillonite, 0.3 part of main antioxidant ZM-1010, 0.2 part of auxiliary antioxidant DLTP, 0.3 part of light stabilizer V703 and 0.2 part of lubricant EBS;
(2) the same process as in example 2 was used to prepare an environmentally friendly-low odor polypropylene composite.
Example 8
(1) An environment-friendly low-odor polypropylene composite material comprises the following components, by weight, 70 parts of polypropylene M2600R, 10 parts of toughener EPDM, 9 parts of kaolin, 10 parts of montmorillonite, 0.2 part of main antioxidant ZM-1010, 0.2 part of auxiliary antioxidant DLTP, 0.2 part of light stabilizer V703 and 0.2 part of lubricant EBS;
(2) the same process as in example 2 was used to prepare an environmentally friendly-low odor polypropylene composite.
Example 9
(1) An environment-friendly low-odor polypropylene composite material comprises the following components, by weight, 44 parts of polypropylene M2600R, 20 parts of talcum powder, 15 parts of toughener EPDM, 10 parts of kaolin, 10 parts of montmorillonite, 0.3 part of main antioxidant ZM-1010, 0.3 part of auxiliary antioxidant DLTP, 0.3 part of light stabilizer V703 and 0.3 part of lubricant EBS;
(2) the same process as in example 2 was used to prepare an environmentally friendly-low odor polypropylene composite.
Example 10
(1) An environment-friendly low-odor polypropylene composite material comprises the following components, by weight, 44 parts of polypropylene M2600R, 20 parts of talcum powder, 15 parts of toughener EPDM, 10 parts of kaolin, 10 parts of montmorillonite, 0.3 part of main antioxidant ZM-1010, 0.2 part of auxiliary antioxidant DLTP, 0.3 part of light stabilizer V703 and 0.2 part of lubricant EBS;
(2) the same process as in example 2 was used to prepare an environmentally friendly-low odor polypropylene composite.
Comparative example 1
(1) An environment-friendly low-odor polypropylene composite material comprises the following components, by weight, 59 parts of polypropylene M2600R, 20 parts of toughener EPDM, 20 parts of talcum powder, 0.2 part of main antioxidant ZM-1010, 0.1 part of auxiliary antioxidant DLTP, 0.2 part of light stabilizer V703 and 0.1 part of lubricant EBS;
(2) the same process as in example 2 was used to prepare an environmentally friendly-low odor polypropylene composite.
Comparative example 2
(1) An environment-friendly low-odor polypropylene composite material comprises the following components, by weight, 62 parts of polypropylene M2600R, 15 parts of toughening agent EPDM, 10 parts of talcum powder, 6 parts of montmorillonite, 6 parts of kaolin, 0.3 part of main antioxidant ZM-1010, 0.2 part of auxiliary antioxidant DLTP, 0.3 part of light stabilizer V703 and 0.2 part of lubricant EBS;
(2) adding the polypropylene, the toughening agent, the phyllosilicate mineral filler, the antioxidant, the lubricant, the light stabilizer and the like into a high-speed stirrer, and mixing for 15min at the rotating speed of 300 r/min;
(3) adding the product obtained in the step (2) into a double-screw extruder, and carrying out melt extrusion and granulation on the uniformly mixed materials in the step in the double-screw extruder with the length-diameter ratio of 25:1, wherein the rotation speed of a screw is 35r/min, the extrusion processing temperature is 165 ℃, 175 ℃, 180 ℃, 185 ℃, 190 ℃, 185 ℃ and 28 ℃ in sequence, and the water tank temperature is 28 ℃.
Comparative example 3
(1) An environment-friendly low-odor polypropylene composite material comprises, by weight, 59 parts of polypropylene M2600R, 5 parts of talcum powder, 15 parts of toughening agent EPDM, 8 parts of kaolin, 0.3 part of main antioxidant ZM-1010, 0.2 part of auxiliary antioxidant DLTP, 0.3 part of light stabilizer V703 and 0.2 part of lubricant EBS.
(2) The same process as in example 2 was used to prepare an environmentally friendly-low odor polypropylene composite.
Performance evaluation mode and reference standard:
the granulated material prepared in the above-mentioned manner was dried in a forced air oven at 80 ℃ for 5 hours, and then the dried granulated material was molded into a standard test specimen by means of an injection molding machine.
And (3) testing tensile property: according to the GB/T1040.2-2006 standard, the drawing speed is 50 mm/min;
and (3) testing the bending property: the bending is carried out according to the GB/T9341-2008 standard, and the bending speed is 2 mm/min;
impact strength of the simply supported beam notch: performing according to GB/TGB/T1043.1-2008 standard;
melt flow rate test: according to the GB/T3682-2000 standard, the temperature is 230 ℃, and the weight is loaded to 2.16 kg;
testing the heat distortion temperature: according to the GB/T1634.2-2004 standard, the heating rate is 120 ℃/h, and the load is 0.45 Mpa;
vicat softening temperature test: according to the GB/T1633-2000 standard, the heating rate is 50 ℃/h, and the load is 1 kg;
the total volatile organic test was performed according to VDA277-1995 standard using an HS-GC-FID instrument;
odor rating was tested according to VDA270-1992, where condition 1 is 50ml of deionized water in wet form, temperature 40 + -2 deg.C, time 24 + -1 h; the condition 2 is dry state, the temperature is 80 +/-2 ℃, and the time is 2h +/-10 min.
The polypropylene compositions prepared in the above examples and comparative examples were tested by performance tests, and the results are shown in the following table:
TABLE 1 test data for examples and comparative examples
Table 1
Table 1 (continuation)
As can be seen from the data of examples 1-10 and comparative examples 1-3, the polypropylene composite material prepared by the invention utilizes the high adsorption capacity and high dispersion performance of the phyllosilicate mineral filler, and can improve the characteristics of impact resistance, fatigue resistance, creep resistance at high temperature, dimensional stability, heat resistance and the like of the polymer material. By filling two or more fillers, the synergistic enhancement effect is achieved. In addition, the unique secondary melting and blending process can effectively control and reduce the odor and VOC generation in the polypropylene synthesis, processing and long-term photo-thermal aging processes, and avoids the problems of degradation, adsorption balance and volatilization pollution caused by adding a large amount of surface modifiers and auxiliaries. The polypropylene composite material prepared by the invention meets the requirement of automobile host factories on the grade of less than or equal to 3.0 of smell, and has the comprehensive properties of low VOC, high heat resistance, excellent impact strength, excellent bending strength and the like. The polypropylene composites of examples 1-10 had odor levels and VOCs significantly lower than those of the polymer of comparative example 1, which had been prepared by adding only one phyllosilicate mineral filler, the polymer of comparative example 2, which had been prepared by conventional processing techniques, and the polymer of comparative example 3, which had been prepared with phyllosilicate mineral filler in a weight proportion lower than the minimum weight proportion required in the present invention.
Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present invention, and not for limiting the protection scope of the present invention, although the present invention is described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions can be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention.
Claims (6)
1. The polypropylene composite material is characterized by comprising the following formula components in parts by weight:
44-70 parts of polypropylene;
15-40 parts of a phyllosilicate mineral filler;
10-20 parts of a toughening agent;
0.1-1 part of antioxidant;
0.1-1 part of a stabilizer;
the layered silicate mineral filler is a mixture of two or more of talcum powder, kaolin, montmorillonite and mica;
the particle size of the phyllosilicate mineral filler is 5-100 microns;
the polypropylene is a homopolymer or a block copolymer, and the melt flow rate of the polypropylene is 0.5-60 g/10 min;
the toughening agent is one or a mixture of more of ethylene propylene diene monomer, ethylene-octene copolymer, ethylene-butene copolymer and polyolefin block copolymer, and the melt flow rate of the toughening agent is 0.2-10 g/10 min;
the polypropylene composite material is prepared by processing the following steps:
step one, adding polypropylene and phyllosilicate mineral filler into a stirrer together, and stirring uniformly for 8-15 min;
step two, melting and extruding the material uniformly mixed in the step one by using a double-screw extruder, controlling the extrusion temperature at 170-180 ℃ in a feeding section, 180-190 ℃ in a conveying section, 190-200 ℃ in a melting section, 180-190 ℃ in a machine head temperature, 20-40 ℃ in a water tank, cooling, granulating and drying to obtain modified polypropylene master batches;
step three, adding the modified polypropylene master batch obtained in the step two, a toughening agent, an antioxidant and a stabilizer into a stirrer together, and stirring uniformly for 8-15 min;
step four, adding the mixture obtained in the step three into a double-screw extruder for secondary extrusion, controlling the extrusion temperature at 160-170 ℃ in a feeding section, 170-180 ℃ in a conveying section, 180-190 ℃ in a melting section, 180-190 ℃ in a machine head temperature, 20-40 ℃ in a water tank, cooling, granulating and drying to obtain the polypropylene composite material;
the rotating speed of the screw is 25-50 r/min.
2. The polypropylene composite material according to claim 1, wherein the antioxidant is one or a mixture of several of the antioxidant 1010, the antioxidant 1076 and the antioxidant DLTP.
3. The polypropylene composite according to claim 1, wherein the stabilizer is a heat stabilizer and/or a light stabilizer.
4. The polypropylene composite material as claimed in claim 3, wherein the light stabilizer is one or more of V703, fenoxanil 5589 and UV-531.
5. The polypropylene composite material according to claim 1, further comprising other additives, wherein the other additives are at least one of a lubricant, a solubilizer, a plasticizer and a color masterbatch, and the lubricant is vinyl bis-stearamide.
6. The polypropylene composite material according to claim 1, wherein in the method step, the rotation speed of the stirrer is 300-500 r/min.
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| CN110746652B (en) * | 2019-10-25 | 2020-12-08 | 安徽江淮汽车集团股份有限公司 | Preparation method of polyolefin VOC (volatile organic compound) improved filler and polyolefin composite material |
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