CN111777831A - Graphene modified PVC plastisol for automobile chassis and preparation method thereof - Google Patents
Graphene modified PVC plastisol for automobile chassis and preparation method thereof Download PDFInfo
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Abstract
The invention discloses a graphene modified PVC plastisol for an automobile chassis, which comprises the following components in parts by weight: 0.5-2 parts of graphene; 25-40 parts of PVC paste resin; 10-20 parts of a glycerin phthalate plasticizer; 15-30 parts of an epoxy plasticizer; 1-2 parts of epoxy adhesive; 0-1 part of polyurethane adhesive; 0-1 part of a viscosity reducer; 10-15 parts of nano calcium carbonate; 1-2 parts of fumed silica; 10-15 parts of a filler; 0-1 part of an auxiliary agent. The invention also discloses a preparation method of the graphene modified PVC plastisol. Compared with the traditional PVC plastisol, the graphene modified PVC plastisol prepared by the invention has the tensile strength of more than or equal to 1.5MPa, the elongation of more than or equal to 75 percent, the adhesive force of 0-1 grade, the stone impact resistance of 0.5-1 grade and the neutral salt spray resistance of 720 hours, and simultaneously, the damping and noise reduction performances of the PVC plastisol are as follows: the sound insulation coefficient between 400 and 6300Hz is more than 230db/cm, the comprehensive performance reaches or is superior to the national standard, and the requirements of the automobile chassis on stone impact resistance, corrosion resistance, vibration reduction and noise reduction can be met.
Description
Technical Field
The invention relates to a preparation method of an automobile protection material, and particularly relates to graphene modified PVC plastisol for an automobile chassis and a preparation method thereof.
Background
The automobile chassis is used for supporting and mounting an automobile engine and all parts and assemblies thereof, and is used for ensuring the safe running of an automobile. However, in the four major components of an automobile, about half of the corrosion problems occur on parts of an automobile chassis because the service environment of the parts of the automobile chassis is very severe, the chassis is easily impacted by mud and gravels on the bottom surface in rainy and snowy days, the chassis is also subjected to high temperature and high heat on the bottom surface in summer, the chassis is often seriously corroded too early, and the safety, the comfort and the service life of the automobile are seriously influenced.
In order to solve the problems, a layer of anti-stone-impact and anti-corrosion coating needs to be coated on the vehicle bottom, wheel arch, skirt edge and other parts, and in addition to the requirements of corrosion resistance and stone-impact resistance, the comfort of the vehicle needs to be concerned, namely the noise and vibration of the vehicle during running are reduced. According to the investigation: the PVC type stone chip resistant coating occupies most of the market share of the existing stone chip resistant coating, and has relatively balanced performances and relatively high performance-to-cost ratio. But the damping and sound insulation performance of the PVC plastisol is poor, and meanwhile, the problems that the stone impact resistance is not matched with the corrosion resistance, the stone impact part is seriously corroded and the like exist.
Graphene is the thinnest and most rigid nano material known at present, has the characteristics of ultrathin property, ultralight property, ultraflexibility, ultrahigh strength, ultrahigh electrical conductivity, excellent heat conductivity and light transmittance and the like, and is widely applied to the field of anticorrosive coatings in recent years. The specific surface area, the number of layers, the particle size and other parameters of the graphene have great influence on the performance of the graphene anticorrosive paint.
However, the work of graphene modified PVC plastisol for automobile chassis, especially the improvement of the stone-impact resistance, corrosion resistance, noise reduction and other performances of PVC by adopting graphene with reasonable layer number, specific surface area, particle size and other structural parameters has not been reported at home and abroad.
Disclosure of Invention
The invention aims to provide graphene modified PVC plastisol for an automobile chassis, which can effectively solve the technical problems of poor damping and sound insulation performance, unmatched stone-impact resistance and corrosion resistance, serious corrosion of a stone-impact-resistant part and the like of the traditional PVC plastisol.
The technical scheme of the invention is as follows:
the graphene modified PVC plastisol for the automobile chassis comprises the following components in parts by weight: 0.5-2 parts of graphene; 25-40 parts of PVC paste resin; 10-20 parts of a glycerin phthalate plasticizer; 15-30 parts of an epoxy plasticizer; 1-2 parts of epoxy adhesive; 0-1 part of polyurethane adhesive; 0-1 part of a viscosity reducer; 10-15 parts of nano calcium carbonate; 1-2 parts of fumed silica; 10-15 parts of a filler; 0-1 part of an auxiliary agent.
Preferably, the graphene modified PVC plastisol for automobile chassis is described above, wherein the number of graphene layers is 1 to E10 layers with specific surface area of 500-2630 m2Per g, particle size: 5 to 20 μm.
Preferentially, the rheological property of the graphene modified PVC plastisol is improved by using the nano calcium carbonate, the strength and the heat resistance of the plastisol are increased, and the cost is reduced; the stability of the graphene modified PVC plastisol is improved by utilizing the fumed silica, certain porosity exists, and the density is reduced.
Preferentially, the number of layers of the graphene is 3-10, so that the micromolecule blocking effect of PVC can be improved on the premise of ensuring certain porosity of the PVC plastisol, the corrosion resistance of the PVC plastisol is improved, and the PVC plastisol has good economical efficiency and reduced cost. The granularity of the graphene is 5-20 mu m, so that the strength and the stone-impact resistance of the PVC plastisol can be improved.
Preferably, the graphene modified PVC plastisol for the automobile chassis is prepared as described above, wherein the filler comprises calcium oxide powder, quartz powder, EPS powder, precipitated barium sulfate powder and mica powder.
Preferably, the filler is prepared by mixing calcium oxide powder, quartz powder, EPS powder, precipitated barium sulfate powder and mica powder according to the weight ratio of 0.2:2:1:0.1: 0.1.
Preferentially, as a filler, calcium oxide powder improves the heat resistance of the graphene-modified PVC plastisol; the quartz powder improves the strength and the stone impact resistance of the graphene modified PVC plastisol; the EPS powder enables the graphene plastisol to have certain pores, improves the sound insulation coefficient of the graphene modified PVC plastisol, and reduces the density; the acid and alkali resistance and high temperature resistance of the graphene modified PVC plastisol are improved by the precipitated barium sulfate powder, and the cost is reduced; the mica powder improves the acid and alkali resistance, stone impact resistance and wear resistance of the graphene modified PVC plastisol.
Preferably, the graphene modified PVC plastisol for the automobile chassis comprises an adhesion promoter, a dispersion promoter, a leveling agent and a foaming agent.
Preferably, the auxiliary agent is prepared by mixing an adhesion promoter, a dispersion promoter, a leveling agent and a foaming agent according to a weight ratio of 1:1:1: 1.
Preferably, the adhesion promoter comprises one of BYK-1163 and BYK-2616, and the dispersion promoter comprises one of DISPERPLAST-1142, DISPERPLAST-1150 and DISPERPLAST-1148; the leveling agent is RHEOBYK-410; the blowing agent was BYK 3160.
The invention also provides a preparation method of the graphene modified PVC plastisol for the automobile chassis, which comprises the following steps:
(1) uniformly mixing a phthalic acid snore plasticizer and an epoxy plasticizer to obtain a mixed plasticizer;
(2) adding graphene into the mixed plasticizer, and dispersing for 1-10 minutes by adopting ultrasonic grinding to obtain a graphene plasticizer;
(3) adding PVC paste resin into the graphene plasticizer, and stirring for 5-20 minutes to obtain graphene modified PVC resin slurry;
(4) adding nano calcium carbonate, a filler, an auxiliary agent and fumed silica into the graphene modified PVC resin slurry, and grinding at a high speed for 10-30 minutes to obtain graphene modified PVC adhesive slurry;
(5) adding an epoxy adhesive and a polyurethane adhesive into the graphene modified PVC adhesive slurry, and stirring at a high speed for 5-10 minutes to obtain graphene modified PVC plastisol slurry;
(6) and adding the viscosity reducer into the graphene modified PVC plastisol slurry, adjusting the viscosity, and standing for 10-30 minutes to obtain the graphene modified PVC plastisol for the automobile chassis.
Preferably, the ratio of the phthalamic acid and epoxy plasticizer in step (1) above is 1: 1.5.
Preferentially, 3-10 layers of graphene can be well dispersed by adopting a phthalic acid nitrile plasticizer and an epoxy plasticizer in a ratio of 1: 1.5.
The invention provides the graphene with reasonable layer number, specific surface area, particle size and other structural parameters, and the graphene is effectively dispersed by adopting a reasonable plasticizer ratio; by utilizing the physical barrier effect of the graphene, the PVC plastisol coating still has excellent corrosion resistance under the condition of certain pores, and certain porosity has favorable effects on shock absorption, noise reduction and weight reduction. Therefore, the graphene modified PVC plastisol for the automobile chassis and the preparation method thereof provided by the invention can obviously improve the stone impact resistance, corrosion resistance and noise reduction performance of the PVC plastisol. On the other hand, the graphene with lower content can replace the addition of some antioxidants, heat stabilizers and the like, so that the comprehensive cost is reduced.
The invention has the following beneficial effects: the paint has good application property, the tensile strength is more than or equal to 1.5MPa, the elongation is more than or equal to 75%, the adhesive force is 0-1 grade, the stone impact resistance reaches 0.5-1 grade, the stone impact resistance and 720 hours neutral salt spray resistance reaches 0.5-1 grade, and meanwhile, the damping and noise reduction performance reaches: the sound insulation coefficient is more than 230db/cm between 400 and 6300 Hz.
Drawings
FIG. 1 is a photograph of an adhesion test of example 1;
FIG. 2 is a photograph of an embodiment of example 2 after stone impact +720 hours neutral salt spray test;
FIG. 3 is a photograph of comparative example 1 after stone impact +720 hours neutral salt spray test.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings of the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention. Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.
Table 1 shows the parts by weight of each component in examples 1 to 3 and comparative example 1.
TABLE 1 EXAMPLES AND COMPARATIVE EXAMPLES the weights (unit: kg) of the respective components of the raw materials
Example 1:
the components were weighed in parts by weight as indicated in table 1. Wherein the number of graphene layers is 1-3, and the specific surface area is 2000-2630 m2Per g, particle size: 5 to 10 μm. Wherein the auxiliary agent comprises: adhesion promoters (BYK-1163), dispersion promoters including (DISPERPLAST-1142); a leveling agent (RHEOBYK-410); blowing agent (BYK 3160). Wherein, the adhesion promoter, the dispersion promoter, the flatting agent and the foaming agent are mixed according to the weight ratio of 1:1:1: 1.
Uniformly mixing a phthalic acid snore plasticizer and an epoxy plasticizer; adding graphene into the mixed plasticizer, and dispersing for 1 minute by ultrasonic grinding; then adding PVC paste resin, and stirring for 5 minutes; then adding nano calcium carbonate, filler, auxiliary agent and fumed silica, and grinding at high speed for 30 minutes; then adding an epoxy adhesive and a polyurethane adhesive, and stirring at a high speed for 5 minutes; then standing for 10 minutes; obtaining the graphene modified PVC plastisol for the automobile chassis.
Wherein the filler is prepared by mixing calcium oxide powder, quartz powder, EPS powder, precipitated barium sulfate powder and mica powder according to the weight ratio of 0.2:2:1:0.1: 0.1.
Preparing a test substrate from the graphene modified PVC plastisol for the automobile chassis prepared in the embodiment 1 according to a conventional curing method, and performing performance detection, wherein the performance indexes of the test are as follows: tensile strength: 2.0MPa, elongation: 85%, adhesion force 0 level (see attached figure 1), stone impact resistance 0.5 level, stone impact resistance +720 hours neutral salt fog resistance 0.5 level, and simultaneously, the damping and noise reduction performance reaches: sound insulation coefficient between 400 Hz and 6300 Hz: 250 db/cm.
Example 2:
the components were weighed in parts by weight as indicated in table 1. Wherein the number of graphene layers is 4-5, and the specific surface area is 1000-2000 m2Per g, particle size: 10E up to ten18 μm. Wherein the auxiliary agent comprises: adhesion promoters (BYK-2616), dispersion promoters (DISPERPLAST-1150); a leveling agent (RHEOBYK-410); blowing agent (BYK 3160). Wherein, the adhesion promoter, the dispersion promoter, the flatting agent and the foaming agent are mixed according to the weight ratio of 1:1:1: 1.
Uniformly mixing a phthalic acid snore plasticizer and an epoxy plasticizer; adding graphene into the mixed plasticizer, and dispersing for 5 minutes by adopting ultrasonic grinding; then adding PVC paste resin, and stirring for 15 minutes; then adding nano calcium carbonate, filler, auxiliary agent and fumed silica, and grinding at high speed for 15 minutes; then adding an epoxy adhesive and a polyurethane adhesive, and stirring at a high speed for 10 minutes; then adding a viscosity reducer, and standing for 30 minutes; obtaining the graphene modified PVC plastisol for the automobile chassis.
Wherein the filler is prepared by mixing calcium oxide powder, quartz powder, EPS powder, precipitated barium sulfate powder and mica powder according to the weight ratio of 0.2:2:1:0.1: 0.1.
Preparing a test substrate from the graphene modified PVC plastisol for the automobile chassis prepared in the embodiment 2 according to a conventional curing method, and performing performance detection, wherein the performance indexes of the test are as follows: tensile strength: 1.8MPa, elongation: 75%, adhesive force 0 level, stone impact resistance 0.5 level, stone impact resistance +720 hours neutral salt fog resistance 1 level (see attached figure 2), and simultaneously, the damping and noise reduction performance reaches: sound insulation coefficient between 400 Hz and 6300 Hz: 280 db/cm.
Example 3:
the components were weighed in parts by weight as indicated in table 1. Wherein the number of graphene layers is 6-10, and the specific surface area is 500-1000 m2Per g, particle size: 15 to 20 μm. Wherein the auxiliary agent comprises: adhesion promoters (BYK-2616), dispersion promoters (DISPERPLAST-1148); a leveling agent (RHEOBYK-410); blowing agent (BYK 3160). Wherein, the adhesion promoter, the dispersion promoter, the flatting agent and the foaming agent are mixed according to the weight ratio of 1:1:1: 1.
Uniformly mixing a phthalic acid snore plasticizer and an epoxy plasticizer; adding graphene into the mixed plasticizer, and dispersing for 10 minutes by adopting ultrasonic grinding; then adding PVC paste resin, and stirring for 20 minutes; then adding nano calcium carbonate, filler, auxiliary agent and fumed silica, and grinding at high speed for 10 minutes; then adding an epoxy adhesive and a polyurethane adhesive, and stirring at a high speed for 10 minutes; then standing for 15 minutes; obtaining the graphene modified PVC plastisol for the automobile chassis.
Wherein the filler is prepared by mixing calcium oxide powder, quartz powder, EPS powder, precipitated barium sulfate powder and mica powder according to the weight ratio of 0.2:2:1:0.1: 0.1.
Preparing a test substrate from the graphene modified PVC plastisol for the automobile chassis prepared in the embodiment 3 according to a conventional curing method, and performing performance detection, wherein the performance indexes of the test are as follows: tensile strength: 1.6MPa, elongation: 80%, adhesive force 0.5 level, anti stone-impact performance 0.5 level, anti stone-impact +720 hours neutral salt fog performance 1 level, simultaneously, the vibration/noise reduction performance reaches: sound insulation coefficient between 400 Hz and 6300 Hz: 320 db/cm.
Comparative example 1:
the components were weighed in parts by weight as indicated in table 1. The preparation method is identical to example 2, except that the comparative example does not add graphene.
Preparing a test substrate from the graphene modified PVC plastisol for the automobile chassis prepared in the comparative example 1 according to a conventional curing mode, and carrying out performance detection, wherein the performance indexes of the test are as follows: tensile strength: 1.5MPa, elongation: 75%, adhesive force 0.5 grade, anti stone-strike performance 1 grade, anti stone-strike +720 hours neutral salt fog performance 3 grade (see attached figure 3), simultaneously, the shock attenuation and noise reduction performance reaches: sound insulation coefficient between 400 Hz and 6300 Hz: 200 db/cm.
Comparative example 2
According to the component proportions shown in the example 3 in the table 1, the difference is that 11 layers of graphene is adopted, and the specific surface area and the particle size of the graphene are unchanged. Preparing a test substrate from the graphene modified PVC plastisol for the automobile chassis prepared in the comparative example 2 according to a conventional curing mode, and carrying out performance detection, wherein the performance indexes of the test are as follows: tensile strength: 1.3MPa, elongation: 50%, adhesive force 2 level, anti stone hit performance 2 level, anti stone hit +720 hours neutral salt fog performance 3 levels, simultaneously, vibration/noise reduction performance reaches: sound insulation coefficient between 400 Hz and 6300 Hz: 210 db/cm.
From the results, in the comparative example 2, after the number of graphene layers is adjusted to exceed 10, the stone impact resistance and the 720-hour neutral salt spray resistance of the graphene modified PVC plastisol for the automobile chassis and the damping and noise reduction performance are all obviously reduced.
Comparative example 3
According to the composition ratio shown in the example 3 in the table 1, the difference is that the specific surface area of the graphene is 100-400m2The number of layers and the granularity of the graphene are unchanged. Preparing a test substrate from the graphene modified PVC plastisol for the automobile chassis prepared in the comparative example 3 according to a conventional curing mode, and carrying out performance detection, wherein the performance indexes of the test are as follows: tensile strength: 1.0MPa, elongation: 45%, adhesive force 2 level, 3 grades of anti stone hit performance, anti stone hit +720 hours neutral salt fog performance 3 grades, simultaneously, vibration/noise reduction performance reaches: sound insulation coefficient between 400 Hz and 6300 Hz: 223 db/cm.
From the above results, it is understood that comparative example 3 adjusts the specific surface area of graphene to less than 500m2After the concentration of the graphene modified PVC plastisol for the automobile chassis is/g, the stone impact resistance and the 720-hour neutral salt spray resistance and the vibration and noise reduction performance of the graphene modified PVC plastisol are obviously reduced.
Comparative example 4
The composition ratios of the components shown in example 1 in table 1 are different in that the particle size of graphene is 1-3 μm, and the specific surface area and the number of layers of graphene are unchanged. Preparing a test substrate from the graphene modified PVC plastisol for the automobile chassis prepared in the comparative example 4 according to a conventional curing mode, and carrying out performance detection, wherein the performance indexes of the test are as follows: tensile strength: 1.3MPa, elongation: 65%, adhesive force 2 level, 3 levels of stone impact resistance and 720 hours neutral salt fog resistance, and simultaneously, the damping and noise reduction performance reaches: sound insulation coefficient between 400 Hz and 6300 Hz: 198 db/cm.
From the results, the particle size of the graphene is adjusted to be less than 5 μm in comparative example 4, and the stone impact resistance, the stone impact resistance and the 720-hour neutral salt spray resistance of the graphene modified PVC plastisol for the automobile chassis and the vibration and noise reduction performance are obviously reduced.
Comparative example 5
The composition ratios of the components shown in example 3 in table 1 are different in that the particle size of graphene is 22-27 μm, and the specific surface area and the number of layers of graphene are unchanged. Preparing a test substrate from the graphene modified PVC plastisol for the automobile chassis prepared in the comparative example 5 according to a conventional curing mode, and carrying out performance detection, wherein the performance indexes of the test are as follows: tensile strength: 0.9MPa, elongation: 70%, adhesive force 2 level, anti stone hit performance 2 level, anti stone hit +720 hours neutral salt fog performance 3 levels, simultaneously, vibration/noise reduction performance reaches: sound insulation coefficient between 400 Hz and 6300 Hz: 217 db/cm.
From the results, the particle size of the graphene is adjusted to be higher than 20 μm in the comparative example 5, and the stone impact resistance, the stone impact resistance and the 720-hour neutral salt spray resistance of the graphene modified PVC plastisol for the automobile chassis and the vibration and noise reduction performance are obviously reduced.
According to the test results of the comparative examples 2 to 5, the PVC plastisol has good stone impact resistance, corrosion resistance and noise reduction performance through a large number of tests and comprehensive selection of parameters such as the specific surface area, the granularity and the number of layers of graphene.
Comparative example 6
According to the mixture ratio of each component shown in the example 1 in the table 1, the difference is that phthalic acid methylene type plasticizer is 8kg, epoxy plasticizer is 14kg, the graphene modified PVC plastisol for the automobile chassis prepared in the comparative example 6 is used for preparing a test substrate according to a conventional curing mode, and performance detection is carried out, wherein the performance indexes of the test are as follows: the damping and noise reduction performance reaches: sound insulation coefficient between 400 Hz and 6300 Hz: 182 db/cm.
Comparative example 7
According to the mixture ratio of each component shown in the example 3 in the table 1, the difference is that 22kg of phthalic acid ester plasticizer and 32kg of epoxy plasticizer, the graphene modified PVC plastisol for the automobile chassis prepared in the comparative example 7 is used for preparing a test substrate according to a conventional curing mode, and the performance test is carried out, wherein the performance indexes of the test are as follows: the damping and noise reduction performance reaches: sound insulation coefficient between 400 Hz and 6300 Hz: 153 db/cm.
Comparative example 8
According to the mixture ratio of each component shown in the example 1 in the table 1, the difference is that the amount of the phthalic acid methylene plasticizer is 22kg, the graphene modified PVC plastisol for the automobile chassis prepared in the comparative example 8 is used for preparing a test substrate according to a conventional curing mode, and the performance test is carried out, wherein the performance indexes of the test are as follows: the damping and noise reduction performance reaches: sound insulation coefficient between 400 Hz and 6300 Hz: 216 db/cm.
Comparative example 9
According to the mixture ratio of each component shown in the example 3 in the table 1, the difference is that the epoxy plasticizer is 13kg, the graphene modified PVC plastisol for the automobile chassis prepared in the comparative example 9 is used for preparing a test substrate according to a conventional curing mode, and the performance test is carried out, wherein the performance index of the test is as follows: the damping and noise reduction performance reaches: sound insulation coefficient between 400 Hz and 6300 Hz: 204 db/cm.
From the test data of comparative examples 6 and 7, it can be seen that when the weight ratio of the graphene to the plasticizer is beyond the range defined by the present invention, the damping and noise reducing performance of the PVC plastisol is significantly reduced. As can be seen from comparative examples 8 and 9, when the weight ratio of the phthalamic acid ester plasticizer to the epoxy plasticizer exceeds the range defined in the present invention (i.e., 1:1.5), the damping and noise reducing performance of the PVC plastisol is still not satisfactory.
The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all equivalent structures or equivalent flow transformations made by using the contents of the specification and the drawings, or applied directly or indirectly to other related systems, are included in the scope of the present invention.
Claims (10)
1. The graphene modified PVC plastisol for the automobile chassis is characterized by comprising the following components in parts by weight:
2. the graphene-modified PVC plastisol for automobile chassis according to claim 1, wherein the graphene-modified PVC plastisol comprises: the number of graphene layers is 1-10, and the specific surface area is 500-2630 m2Per g, particle size: 5 to 20 μm.
3. The graphene-modified PVC plastisol for automobile chassis according to claim 1, wherein the graphene-modified PVC plastisol comprises: the filler comprises calcium oxide powder, quartz powder, EPS powder, precipitated barium sulfate powder and mica powder.
4. The graphene-modified PVC plastisol for the automobile chassis according to claim 3, wherein the filler is prepared by mixing calcium oxide powder, quartz powder, EPS powder, precipitated barium sulfate powder and mica powder according to the weight ratio of 0.2:2:1:0.1: 0.1.
5. The graphene-modified PVC plastisol for automobile chassis according to claim 1, wherein the graphene-modified PVC plastisol comprises: the auxiliary agent comprises an adhesion promoter, a dispersion promoter, a flatting agent and a foaming agent.
6. The graphene-modified PVC plastisol for automobile chassis according to claim 5, wherein the graphene-modified PVC plastisol comprises: the auxiliary agent is prepared by mixing an adhesion promoter, a dispersion promoter, a flatting agent and a foaming agent according to the weight ratio of 1:1:1: 1.
7. The graphene-modified PVC plastisol for automobile chassis according to claim 5, wherein the graphene-modified PVC plastisol comprises: the adhesion promoter comprises one of BYK-1163 and BYK-2616, and the dispersion promoter comprises one of DISPERPLAST-1142, DISPERPLAST-1150 and DISPERPLAST-1148; the leveling agent is RHEOBYK-410; the blowing agent was BYK 3160.
8. The graphene-modified PVC plastisol for automobile chassis according to any one of claims 1 to 7, wherein: the tensile strength is more than or equal to 1.5MPa, the elongation is more than or equal to 75%, the adhesive force is 0-1 grade, the stone impact resistance reaches 0.5-1 grade, the stone impact resistance and 720 hours neutral salt spray resistance reaches 0.5-1 grade, and meanwhile, the damping and noise reduction performance reaches: the sound insulation coefficient is more than 230db/cm between 400 and 6300 Hz.
9. The preparation method of the graphene modified PVC plastisol for the automobile chassis according to claim 1, which is characterized by comprising the following steps: the preparation method comprises the following steps:
(1) uniformly mixing a phthalic acid snore plasticizer and an epoxy plasticizer to obtain a mixed plasticizer;
(2) adding the graphene of claims 1 and 2 into the mixed plasticizer obtained in step (1), and dispersing for 1-10 minutes by ultrasonic grinding to obtain a graphene plasticizer;
(3) adding PVC paste resin into the graphene plasticizer obtained in the step (2), and stirring for 5-20 minutes to obtain graphene modified PVC resin slurry;
(4) adding nano calcium carbonate, a filler, an auxiliary agent and fumed silica into the graphene modified PVC resin slurry obtained in the step (3), and grinding at a high speed for 10-30 minutes to obtain graphene modified PVC adhesive slurry;
(5) adding an epoxy adhesive and a polyurethane adhesive into the graphene modified PVC adhesive slurry obtained in the step (4), and stirring at a high speed for 5-10 minutes to obtain a graphene modified PVC plastisol slurry;
(6) and (4) adding a viscosity reducer into the graphene modified PVC plastisol slurry obtained in the step (5), adjusting the viscosity, and standing for 10-30 minutes to obtain the graphene modified PVC plastisol for the automobile chassis.
10. The preparation method of the graphene-modified PVC plastisol for the automobile chassis according to claim 9, wherein the preparation method comprises the following steps: in the step (1), the ratio of the phthalic acid snore plasticizer to the epoxy plasticizer is 1: 1.5.
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