CN115637002B - Low-shrinkage polypropylene composite material with excellent mechanical properties and preparation method thereof - Google Patents
Low-shrinkage polypropylene composite material with excellent mechanical properties and preparation method thereof Download PDFInfo
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Abstract
The application relates to the technical field of polypropylene materials, in particular to a low-shrinkage polypropylene composite material with excellent mechanical properties and a preparation method thereof. The polypropylene composite material comprises the following raw material components: homo-polypropylene, co-polypropylene, a toughening agent, a modified superfine talcum powder master batch and a hyperdispersant; the weight ratio of the homo-polypropylene, the co-polypropylene, the toughening agent, the modified superfine talcum powder master batch and the hyperdispersant is (33-63) 12:3 (20-50): (1-5); the modified superfine talcum powder master batch is prepared by melt blending superfine talcum powder and polypropylene resin of which the surface is soaked with hydrolyzed (7-octene-1-radical) trimethoxysilane. The application provides a low-shrinkage polypropylene composite material with excellent mechanical properties, which has the advantages of good mechanical properties and low shrinkage and has excellent comprehensive properties.
Description
Technical Field
The application relates to the technical field of polypropylene materials, in particular to a low-shrinkage polypropylene composite material with excellent mechanical properties and a preparation method thereof.
Background
Because the polypropylene resin raw material has the characteristics of good comprehensive mechanical property, high heat-resistant temperature, excellent electrical insulation property and chemical stability to acid and alkali, wide production and processing window, low price and the like, the polypropylene resin raw material is widely applied to the fields of household articles, household appliances and the like, such as related parts of refrigerators, air conditioners, washing machines and the like.
However, since polypropylene is a crystalline polymer, the shrinkage is larger, and the shrinkage is generally 1.0-2.5%, so that the dimensional stability of a product molded by directly using polypropylene resin is poor, which brings a certain challenge to the application of polypropylene materials to products with large injection molding size and high precision requirements, and meanwhile, certain parts manufactured by the injection molding products have certain stress requirements, and if the mechanical properties of the materials are poor, the polypropylene composite material with low shrinkage and good mechanical properties is also difficult to meet, so that the polypropylene composite material has a great demand on the market, and the defects existing in the prior art can be overcome, so as to meet various requirements in practical application.
Disclosure of Invention
To solve the above-mentioned problems in the background art: the existing polypropylene material has the problems of low shrinkage rate and good mechanical property; the application provides a low-shrinkage polypropylene composite material with excellent mechanical properties, which overcomes the defects in the prior art, and has the characteristics of good comprehensive mechanical properties and low shrinkage.
The application provides a low-shrinkage polypropylene composite material with excellent mechanical properties, which comprises the following raw material components: homo-polypropylene, co-polypropylene, a toughening agent, a modified superfine talcum powder master batch and a hyperdispersant; the weight ratio of the homo-polypropylene, the co-polypropylene, the toughening agent, the modified superfine talcum powder master batch and the hyperdispersant is (33-63) 12:3 (20-50): (1-5); the modified superfine talcum powder master batch is formed by melt blending superfine talcum powder and polypropylene resin of which the surface is soaked with hydrolyzed (7-octene-1-yl) trimethoxysilane; the polypropylene resin with the surface soaked with the hydrolyzed (7-octen-1-yl) trimethoxysilane is prepared by mixing polypropylene resin with the hydrolyzed (7-octen-1-yl) trimethoxysilane.
According to the application, the superfine talcum powder is specially prepared into the modified superfine talcum powder master batch, so that the dispersibility of the superfine talcum powder in polypropylene and the binding force of the superfine talcum powder and the polypropylene are improved, the mechanical property of the whole polypropylene composite material is improved, and the shrinkage rate of the material is reduced.
Wherein, the special modified superfine talcum powder master batch is formed by melt blending superfine talcum powder and polypropylene resin of which the surface is soaked with hydrolyzed (7-octene-1-yl) trimethoxysilane; the polypropylene resin with the surface soaked with hydrolyzed (7-octen-1-yl) trimethoxysilane is formed by mixing polypropylene resin with hydrolyzed (7-octen-1-yl) trimethoxysilane, wherein after the (7-octen-1-yl) trimethoxysilane is hydrolyzed, three methoxy groups in molecules are respectively substituted by hydroxyl groups and have polarity, and can form intermolecular hydrogen bonds with crystal water in superfine talcum powder to obtain bridging, the other end of the (7-octen-1-yl) trimethoxysilane molecule is wound and combined with a polypropylene molecular chain which is also nonpolar, and the (7-octen-1-yl) trimethoxysilane connects polypropylene with the superfine talcum powder together, so that the following functions are realized:
(1) Prevent the agglomeration of superfine talcum powder: when the material is subjected to external force, the material is generally destroyed from the weak part, while polypropylene is a notch sensitive material, once a notch is formed, the material is rapidly destroyed along the notch, and the mechanical property of the material is seriously attenuated from the aspect of macroscopic property. The larger talcum powder aggregate is easy to form a stress concentration point in the composite material and is a weak point of the composite material, so that the mechanical property of the polypropylene composite material can be obviously improved by avoiding superfine talcum powder aggregation;
(2) The compatibility of the superfine talcum powder and the polypropylene can be increased by coating the (7-octene-1-yl) trimethoxysilane on the superfine talcum powder, the binding force of the superfine talcum powder and the polypropylene interface is improved, and the integral mechanical property of the polypropylene composite material is improved.
In addition, on the basis of adding the specially-made modified superfine talcum powder master batch, the melt fluidity of the polypropylene composite material is improved by adding the hyperdispersant, so that the superfine talcum powder is favorably dispersed in the resin, and the stress concentration point formed by the agglomeration of the superfine talcum powder can be avoided, thereby avoiding the influence on the integral mechanical property of the material.
In summary, the special modified superfine talcum powder master batch and the hyperdispersant are added on the polypropylene matrix material, so that the dispersibility of the superfine talcum powder in the polypropylene can be improved, the binding force between the superfine talcum powder and the polypropylene can be enhanced, the integral mechanical property of the polypropylene composite material is improved, and the shrinkage rate of the material is reduced.
In one embodiment, the polypropylene resin and the hydrolyzed (7-octen-1-yl) trimethoxysilane are uniformly mixed at the temperature of (60-100) DEG C to obtain the polypropylene resin with the surface soaked with the hydrolyzed (7-octen-1-yl) trimethoxysilane;
and mixing the superfine talcum powder with the polypropylene resin of which the surface is soaked with the hydrolyzed (7-octen-1-yl) trimethoxysilane, and carrying out melt blending extrusion on the mixed material in a single screw extruder to obtain the modified superfine talcum powder master batch.
In one embodiment, the modified superfine talcum powder master batch comprises the following components in parts by weight: (0.01-0.1): (1-5).
In one embodiment, the lubricant composition further comprises other auxiliary agents, wherein the other auxiliary agents comprise an antioxidant and a lubricant;
the composite material comprises the following raw material components in parts by weight: 33-63 parts of homo-polypropylene, 12 parts of co-polypropylene, 3 parts of toughening agent, 20-50 parts of modified superfine talcum powder master batch, 0.4 part of antioxidant, 0.6 part of lubricant and 1-5 parts of hyper-dispersant.
In one embodiment, the superfine talcum powder has a powder particle size D50 of 2 μm or less and a powder particle size D90 of 5 μm or less.
In one embodiment, the hyperdispersant is a nanobased hyperdispersant flow improvement aid.
In one embodiment, the homo-polypropylene is a high isotacticity homo-polypropylene having an isotacticity of 96% or more and a melt flow rate of less than 5g/10min (230 ℃,2.16 kg); the copolymerizationThe polypropylene is a medium-melt high-resistance block copolymerization polypropylene, the melt flow rate is 5-15 g/10min (230 ℃,2.16 kg), and the impact strength of a simply supported beam is more than 20KJ/m 2 。
In one embodiment, the toughening agent is an ethylene-octene copolymer; the antioxidant is one or a combination of more of hindered phenol antioxidants, thioester antioxidants and phosphite antioxidants; the lubricant is one or a combination of more of polyethylene wax, polypropylene wax, calcium stearate, ethylene bis fatty acid amide, zinc stearate and magnesium stearate.
In one embodiment, the toughening agent is an ethylene-octene copolymer having a melt flow rate greater than 20g/10min (190 ℃,2.16 kg).
The application also provides a preparation method of the low-shrinkage polypropylene composite material with excellent mechanical properties, which comprises the following steps:
s100, weighing all raw material components according to a certain weight;
s200, mixing all materials in the step S100 to obtain a premix M;
s300, adding the premix M obtained in the step S200 into a double-screw extruder, and carrying out melt extrusion on the material in the double-screw extruder to obtain the low-shrinkage polypropylene composite material with excellent mechanical properties; wherein the melt extrusion temperature of the double-screw extruder is 170-190 ℃.
Compared with the prior art, the low-shrinkage polypropylene composite material with excellent mechanical properties has the following technical effects:
the application provides a low-shrinkage polypropylene composite material with excellent mechanical properties, which has the advantages of good mechanical properties and low shrinkage and has excellent comprehensive properties.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present application more apparent, the following description will be made in connection with the technical solutions in the embodiments of the present application, and it is apparent that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.
The application also provides a preparation method of the low-shrinkage polypropylene composite material with excellent mechanical properties, which comprises the following steps:
(1) Weighing homo-polypropylene, co-polypropylene, a toughening agent, a modified superfine talcum powder master batch, an antioxidant, a lubricant and a hyperdispersant according to a certain weight;
(2) Adding all materials in the step (1) into a high-speed stirrer, and stirring and mixing uniformly at a high speed to obtain a premix M;
(3) Adding the premix M obtained in the step (2) into a parallel double-screw extruder from a main feeding hopper, so that all component materials are subjected to shearing, melting, blending and extrusion in the parallel double-screw extruder, and all raw material component materials are subjected to shearing, melting, blending and extrusion in the parallel double-screw extruder; wherein the processing temperature of the twin-screw extruder is 170-190 ℃;
(4) And cooling, drying and granulating the material strips discharged from the die of the parallel double-screw extruder to obtain the low-shrinkage polypropylene composite material granules with excellent mechanical properties.
The application also provides a material formula of the low-shrinkage polypropylene composite material with excellent mechanical properties, wherein the material formula comprises, by weight, 33-63 parts of homo-polypropylene, 12 parts of co-polypropylene, 3 parts of a toughening agent, 20-50 parts of a modified superfine talcum powder master batch, 0.4 part of an antioxidant, 0.6 part of a lubricant and 1-5 parts of a hyperdispersant.
The application also provides the following examples and comparative examples:
the formulations (unit: mass%) of the examples and comparative examples provided by the present application are shown in the following table 1:
TABLE 1
Among them, for the raw material components of examples and comparative examples, the raw material components used in the examples and comparative examples are the same in kind, except that examples 1 to 4, comparative examples 1 to 2 and comparative examples 4 to 5 use modified ultrafine talc masterbatches HTP05 to M61776, and comparative example 3 uses modified ultrafine talc masterbatches HTP05 to CG to 8830. The modified superfine talcum powder master batch is a self-product, and specifically, the preparation process of the modified superfine talcum powder master batch HTP 05-M61776 comprises the following steps:
(1) Pouring deionized water at 60 ℃ into a beaker filled with (7-octen-1-yl) trimethoxysilane according to the weight ratio of (7-octen-1-yl) trimethoxysilane to deionized water of 1:3, and standing for 1h to obtain hydrolyzed (7-octen-1-yl) trimethoxysilane for later use after hydrolysis;
(2) Adding 1 part of polypropylene resin powder into a high-speed mixer heated to 80 ℃, then adding 0.01 part of hydrolyzed (7-octen-1-yl) trimethoxysilane, and stirring at a speed of 300r/min for 3 minutes at a high speed to infiltrate and uniformly distribute the hydrolyzed (7-octen-1-yl) trimethoxysilane on the surface of the polypropylene resin;
then adding 1 part of superfine talcum powder, continuously stirring at a high speed for 5 minutes, adding the mixed material into a single screw extruder, and carrying out melting, extrusion bracing and granulating to obtain modified superfine talcum powder master batch HTP 05-M61776; the melt extrusion temperature of the single screw extruder was 210 ℃.
Wherein, the superfine talcum powder is Liaoning Ai Hai HTP05 model, and the powder particle diameter is as follows: d50 is less than or equal to 2 mu m, and D95 is less than or equal to 5 mu m; the (7-octene-1-yl) trimethoxysilane is selected from Shanghai Michael chemical technology Co.Ltd M61776, and the purity is more than 90%.
It should be noted that: the modified superfine talcum powder master batch HTP 05-CG-8830 of comparative example 3 only differs from the modified superfine talcum powder master batch HTP 05-M61776 in the manufacturing process: the surface treating agent used in the preparation process of the modified superfine talcum powder master batch HTP 05-M61776 is (7-octene-1-yl) trimethoxysilane M61776, and the surface treating agent used in the preparation process of the modified superfine talcum powder master batch HTP 05-CG-8830 is octyl trimethoxysilane CG-8830.
Wherein the components in table 1 are specifically:
the selected homopolypropylene is PP501SF of Fujian combined petrochemical industry, which is high-isotacticity homopolypropylene, the isotacticity is more than or equal to 96%, and the melt flow rate (230 ℃ and 2.16 kg) is less than 5g/10min; the selected copolymerized polypropylene is PPSP179 of Lanzhou petrochemical industry, which is middle-melt high-resistance block copolymerized polypropylene, the melt flow rate (230 ℃ and 2.16 kg) is 5-15 g/10min, and the notch impact of a simple beam is more than 20KJ/m < 2 >; the selected toughening agent is POE8402 with fluidity of U.S. Tao Shigao, and the melt flow rate is more than 20g/10min (190 ℃ C., 2.16 kg); the chosen hyper-dispersant is Shanghai hucho DP-1000, which is a nano-based hyper-dispersion flow improvement auxiliary agent, and the dispersion effect of inorganic filler in polypropylene resin is improved through the nano-based hyper-dispersibility; the antioxidants selected are Li Anlong, 1010 and Li Anlong, 168; the lubricant is Zhongshan Huaming tai calcium stearate BS-3818.
According to the formulation of table 1, the raw material components in the examples and comparative examples were prepared as follows:
(1) Weighing homo-polypropylene, co-polypropylene, a toughening agent, a modified superfine talcum powder master batch, an antioxidant, a lubricant and a hyperdispersant according to a certain weight;
(2) Adding all materials in the step (1) into a high-speed stirrer, and stirring and mixing uniformly at a high speed to obtain a premix M;
(3) Adding the premix M obtained in the step (2) into a parallel double-screw extruder from a main feeding hopper, so that all component materials are subjected to shearing, melting, blending and extrusion in the parallel double-screw extruder, and all raw material component materials are subjected to shearing, melting, blending and extrusion in the parallel double-screw extruder; the double-screw extruder is divided into one to ten areas, wherein the processing temperature is one area 170 ℃, two areas 180 ℃, three areas 190 ℃, four areas 190 ℃, five areas 190 ℃, six areas 180 ℃, seven areas 180 ℃, eight areas 180 ℃, nine areas 180 ℃, ten areas 180 ℃ and a machine head 190 ℃;
(4) And cooling, drying and granulating the material strips discharged from the die of the parallel double-screw extruder to obtain the low-shrinkage polypropylene composite material granules with excellent mechanical properties.
The polypropylene composite materials prepared in examples and comparative examples were subjected to the test of the relevant performance indexes under the same test conditions, and the test results are shown in the following table 2:
TABLE 2
The tensile strength test standard IS IS0527-2, the bending strength test standard IS ISO178, and the notched impact strength test standard of the simply supported beam IS ISO179-1; the shrinkage test standard is ISO294-4.
From the test results in table 2, it can be seen that:
the polypropylene composite material prepared in the examples 1-4 provided by the application has the advantages of good mechanical property and low shrinkage.
Comparing the test results of examples 1-4: as can be seen from the comparison between the examples 1 and 2, the shrinkage of the polypropylene molecular chain can be well inhibited and the shrinkage rate of the composite material is obviously reduced as the proportion of the components of the modified superfine talcum powder master batch HTP 05-M61776 is increased and the talcum powder is of a sheet structure; as can be seen from the comparison of the examples 1 and 3, the dispersibility of the superfine talcum powder is further improved along with the increase of the proportion of the hyperdispersant component, the mechanical property of the polypropylene composite material is better, and the shrinkage rate is further reduced;
the comparison results of the examples and the comparative examples show that:
comparative example 1 differs from example 1 only in that: the superfine talcum powder master batch HTP 05-M61776 in the example 1 is replaced by homo-polypropylene; as can be seen from the comparison between the comparative example 1 and the example 4, the comparative example 1 does not add modified superfine talcum powder master batch HTP 05-M61776, and the molecular chain of polypropylene is not inhibited, so that the obtained polypropylene composite material has great shrinkage rate due to crystallization, and the dimensional stability of the material in the practical use process is poor;
comparative example 2 differs from example 4 only in that: the hyperdispersant of example 4 was replaced with homo-polypropylene; as can be seen from the comparison between the comparative example 2 and the example 4, the comparative example 2 does not add the hyperdispersant, the dispersibility uniformity of the modified superfine talcum powder master batches HTP 05-M61776 can be affected to a certain extent, the mechanical property and the shrinkage rate of the whole polypropylene composite material are further adversely affected, the mechanical property is poor, and the shrinkage rate is higher;
comparative example 3 differs from example 4 only in that: the superfine talcum powder master batch HTP 05-M61776 in the example 4 is replaced by modified superfine talcum powder master batch HTP 05-CG-8830; as can be seen from the comparison of the comparative example 3 and the example 4, the mechanical properties of the comparative example 3 are poor compared with the example 4, the comparative example 3 uses octyl trimethoxy silane CG-8830 to replace (7-octene-1-yl) trimethoxy silane M61776 in the example as a surface treating agent for modifying superfine talcum powder master batch, and because the end of the octyl trimethoxy silane linked with polypropylene consists of methylene-methyl structure, the molecular chain of the methylene-methyl structure has good flexibility and is easy to slip when being stretched and stressed; the end of the (7-octen-1-yl) trimethoxysilane linked with polypropylene consists of a methylene-ethylene bond (double bond) structure, the molecular chain of the double bond structure at the tail end has relatively poor flexibility and relatively high rigidity, and the conformation is not easy to change when the stress is applied, so that the talcum powder slides from the molecular chain of the polypropylene, the binding force between the talcum powder and the polypropylene is higher, and finally the integral mechanical property of the obtained polypropylene composite material is better.
The hyperdispersant added in comparative example 4 exceeds the limit of the present application, and the overall mechanical properties of comparative example 4 are deteriorated as compared with the examples; the hyper-dispersant is a small molecule auxiliary agent, and can play a role in lubricating and assisting dispersion of a material system when the addition amount is small (namely the limit range of the application), but after exceeding the critical point of the maximum effective value, small molecules can adversely affect the overall mechanical property of the material.
The modified superfine talcum powder master batch added in the comparative example 5 exceeds the limit of the application, and compared with the modified superfine talcum powder master batch added in the comparative example exceeds the limit of the application, too much modified superfine talcum powder master batch is added, the shrinkage rate of the polypropylene composite material is lower, but the impact strength and the elongation rate are reduced, and the comprehensive performance of the polypropylene composite material is reduced.
The polypropylene composite material prepared in the embodiments 1-4 provided by the application has the advantages of good mechanical property and low shrinkage, has excellent comprehensive performance, and can meet the use requirements of related product components with good dimensional stability requirements and high mechanical property requirements.
It should be noted that:
herein, "to" is used to denote a numerical range, and the expression includes two end points.
The D50 described herein is a conventional particle size expression: refers to the particle size corresponding to a cumulative particle size distribution of 50%, and has the physical meaning that particles with a particle size less than 50% of that value account for the particle size. D90 is the same.
Since the powder particles do not necessarily have a spherical shape, the ultra-fine talc particle size referred to herein is the "equivalent particle size" of the particles rather than their "diameter" (as diameter implies spherical). The superfine talcum powder particle size is of the grade of microscopic particles, and the size of the microscopic particles is not determined by standard sieving technology which is used for macroscopic abrasive particles. Instead, they are determined by other techniques such as laser diffraction, electrical resistance, or photometric precipitation. The size of the powder herein refers to the particle size determined by the laser diffraction method (or referred to as laser particle size detection method) test, by which the cumulative particle size distribution having a value D50 size (particles having a size less than 50% of the value) is output, and the particle size D50 size value is taken to balance the powder size.
Except the practical selection of the specific embodiment, the weight ratio of the homo-polypropylene, the co-polypropylene, the toughening agent, the modified superfine talcum powder master batch and the hyperdispersant is (33-63) 12:3 (20-50): (1-5) may be any of the ranges including, but not limited to, the actual choices embodied in the embodiments described above; wherein the modified superfine talcum powder master batch is formed by melt blending superfine talcum powder and polypropylene resin of which the surface is soaked with hydrolyzed (7-octene-1-yl) trimethoxysilane; the polypropylene resin with the surface soaked with the hydrolyzed (7-octen-1-yl) trimethoxysilane is prepared by mixing polypropylene resin with the hydrolyzed (7-octen-1-yl) trimethoxysilane.
In addition to the actual selection of the specific embodiment, preferably, the components include 33-63 parts by weight of homopolypropylene, 12 parts by weight of copolypropylene, 3 parts by weight of toughening agent, 20-50 parts by weight of modified superfine talcum powder master batch, 0.4 part by weight of antioxidant, 0.6 part by weight of lubricant and 1-5 parts by weight of hyperdispersant, wherein the selection of the scheme formula includes but is not limited to the actual selection of the embodiment.
In addition to the practical choices presented in the above embodiments, preferably, the homo-polypropylene may be selected from high isotacticity homo-polypropylene, and the characteristic parameter is preferably equal to or greater than 96% isotacticity and the melt flow rate is less than 5g/10min, including but not limited to the practical choices presented in the above embodiments;
in addition to the practical choices embodied in the above embodiments, preferably, the polypropylene copolymer is a medium melt high resistance block copolymer polypropylene, the characteristic parameters of which are preferably melt flow rate of 5-15 g/10min, and the impact strength of the simply supported beam is more than 20KJ/m 2 Including but not limited to the actual choices embodied in the embodiments described above;
in addition to the practical choices presented in the above embodiments, preferably, the toughening agent may be selected from existing ethylene-octene copolymer type toughening agents, and the characteristic parameters thereof are preferably melt flow rates greater than 20g/10min, including but not limited to the practical choices presented in the above embodiments.
In addition to the actual choices presented in the above embodiments, the antioxidant may preferably be selected from one or more of hindered phenolic antioxidants, thioester antioxidants, phosphite antioxidants, including but not limited to the actual choices presented in the above embodiments.
In addition to the actual choices presented in the specific embodiments above, preferably, the lubricant may be selected from one or more of polyethylene wax, polypropylene wax, calcium stearate, ethylene bis fatty acid amide, zinc stearate, magnesium stearate, including, but not limited to, the actual choices presented in the embodiments above.
For the raw material components for preparing the modified superfine talcum powder master batch, in addition to the actual selection shown in the above specific embodiments, preferably, the superfine talcum powder can be selected from superfine talcum powder with a powder particle size D50 less than or equal to 2 μm and a powder particle size D90 less than or equal to 5 μm, including but not limited to the actual selection shown in the above embodiments; similarly, the hyperdispersant is preferably an existing nanobased hyperdispersant flow improvement aid, such as Shanghai hucho DP-1000 and the like, including but not limited to the actual choices embodied in the examples above.
In addition to the practical choices presented in the specific examples above, preferably, during the preparation of the modified superfine talc masterbatch, the weight ratio of the polypropylene resin, the hydrolyzed (7-octen-1-yl) trimethoxysilane to the superfine talc is between (1 and 5): (0.01-0.1): (1-5) including, but not limited to, the actual choices embodied in the embodiments described above.
In summary, the specific parameters or some common reagents or raw materials in the above embodiments are specific embodiments or preferred embodiments under the concept of the present application, and are not limiting; and can be adaptively adjusted by those skilled in the art within the concept and the protection scope of the application.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present application, and not for limiting the same; although the application has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the application.
Claims (9)
1. The low-shrinkage polypropylene composite material with excellent mechanical properties is characterized by comprising the following raw material components: homo-polypropylene, co-polypropylene, a toughening agent, a modified superfine talcum powder master batch and a hyperdispersant;
the weight ratio of the homo-polypropylene, the co-polypropylene, the toughening agent, the modified superfine talcum powder master batch and the hyperdispersant is (33-63) 12:3 (20-50): (1-5);
the modified superfine talcum powder master batch is formed by melt blending superfine talcum powder and polypropylene resin of which the surface is soaked with hydrolyzed (7-octene-1-yl) trimethoxysilane; the polypropylene resin with the surface soaked with the hydrolyzed (7-octen-1-yl) trimethoxysilane is prepared by mixing polypropylene resin with the hydrolyzed (7-octen-1-yl) trimethoxysilane;
the hyper-dispersant is Shanghai hucho taimen DP-1000.
2. The low shrinkage polypropylene composite with excellent mechanical properties according to claim 1, characterized in that: uniformly mixing the polypropylene resin with the hydrolyzed (7-octen-1-yl) trimethoxysilane at the temperature of between 60 and 100 ℃ to obtain the polypropylene resin with the surface soaked with the hydrolyzed (7-octen-1-yl) trimethoxysilane;
and mixing the superfine talcum powder with the polypropylene resin of which the surface is soaked with the hydrolyzed (7-octen-1-yl) trimethoxysilane, and carrying out melt blending extrusion on the mixed material in a single screw extruder to obtain the modified superfine talcum powder master batch.
3. The low shrinkage polypropylene composite with excellent mechanical properties according to claim 2, characterized in that: in the components of the modified superfine talcum powder master batch, the weight ratio of the polypropylene resin to the hydrolyzed (7-octene-1-yl) trimethoxysilane to the superfine talcum powder is (1-5): (0.01-0.1): (1-5).
4. The low shrinkage polypropylene composite with excellent mechanical properties according to claim 1, characterized in that: the lubricant also comprises other auxiliary agents, wherein the other auxiliary agents comprise an antioxidant and a lubricant;
the composite material comprises the following raw material components in parts by weight: 33-63 parts of homo-polypropylene, 12 parts of co-polypropylene, 3 parts of toughening agent, 20-50 parts of modified superfine talcum powder master batch, 0.4 part of antioxidant, 0.6 part of lubricant and 1-5 parts of hyper-dispersant.
5. A low shrinkage polypropylene composite material having excellent mechanical properties according to any one of claims 1-3, wherein: the powder particle diameter D50 of the superfine talcum powder is less than or equal to 2 mu m, and the powder particle diameter D90 of the superfine talcum powder is less than or equal to 5 mu m.
6. The low shrinkage polypropylene composite with excellent mechanical properties according to claim 1, characterized in that: the homo-polypropylene is high isotacticity homo-polypropylene, the isotacticity is more than or equal to 96%, and the melt flow rate is less than 5g/10min;
the polypropylene copolymer is medium-melt high-resistance block copolymerization polypropylene, the melt flow rate is 5-15 g/10min, and the impact strength of a simple beam is more than 20KJ/m 2 。
7. The low shrinkage polypropylene composite material with excellent mechanical properties according to claim 4, wherein: the toughening agent is an ethylene-octene copolymer;
the antioxidant is one or a combination of more of hindered phenol antioxidants, thioester antioxidants and phosphite antioxidants;
the lubricant is one or a combination of more of polyethylene wax, polypropylene wax, calcium stearate, ethylene bis fatty acid amide, zinc stearate and magnesium stearate.
8. The low shrinkage polypropylene composite with excellent mechanical properties according to claim 1, characterized in that: the toughening agent is an ethylene-octene copolymer, and the melt flow rate of the toughening agent is more than 20g/10min.
9. A method for preparing a low shrinkage polypropylene composite material having excellent mechanical properties according to any one of claims 1 to 8, comprising the steps of:
s100, weighing all raw material components according to a certain weight;
s200, mixing all materials in the step S100 to obtain a premix M;
s300, adding the premix M obtained in the step S200 into a double-screw extruder, and carrying out melt extrusion on the material in the double-screw extruder to obtain the low-shrinkage polypropylene composite material with excellent mechanical properties; wherein the melt extrusion temperature of the double-screw extruder is 170-190 ℃.
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