CN117777603A - Polypropylene composite material capable of being used for high-efficiency spraying of water paint and preparation method thereof - Google Patents
Polypropylene composite material capable of being used for high-efficiency spraying of water paint and preparation method thereof Download PDFInfo
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- CN117777603A CN117777603A CN202311780448.5A CN202311780448A CN117777603A CN 117777603 A CN117777603 A CN 117777603A CN 202311780448 A CN202311780448 A CN 202311780448A CN 117777603 A CN117777603 A CN 117777603A
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- 239000004743 Polypropylene Substances 0.000 title claims abstract description 66
- 229920001155 polypropylene Polymers 0.000 title claims abstract description 66
- -1 Polypropylene Polymers 0.000 title claims abstract description 65
- 239000003973 paint Substances 0.000 title claims abstract description 56
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 56
- 238000005507 spraying Methods 0.000 title claims abstract description 33
- 239000002131 composite material Substances 0.000 title claims abstract description 31
- 238000002360 preparation method Methods 0.000 title abstract description 6
- 229920001046 Nanocellulose Polymers 0.000 claims abstract description 39
- VYFYYTLLBUKUHU-UHFFFAOYSA-N dopamine Chemical compound NCCC1=CC=C(O)C(O)=C1 VYFYYTLLBUKUHU-UHFFFAOYSA-N 0.000 claims abstract description 36
- 239000000835 fiber Substances 0.000 claims abstract description 27
- 229960003638 dopamine Drugs 0.000 claims abstract description 19
- 239000003963 antioxidant agent Substances 0.000 claims abstract description 18
- 230000003078 antioxidant effect Effects 0.000 claims abstract description 17
- 239000000314 lubricant Substances 0.000 claims abstract description 9
- 239000011256 inorganic filler Substances 0.000 claims abstract description 8
- 229910003475 inorganic filler Inorganic materials 0.000 claims abstract description 8
- 239000012745 toughening agent Substances 0.000 claims abstract description 8
- 238000012986 modification Methods 0.000 claims abstract description 6
- 230000004048 modification Effects 0.000 claims abstract description 6
- 238000000034 method Methods 0.000 claims description 8
- 238000001125 extrusion Methods 0.000 claims description 6
- 238000003756 stirring Methods 0.000 claims description 6
- 238000001035 drying Methods 0.000 claims description 5
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 claims description 4
- CSNNHWWHGAXBCP-UHFFFAOYSA-L Magnesium sulfate Chemical compound [Mg+2].[O-][S+2]([O-])([O-])[O-] CSNNHWWHGAXBCP-UHFFFAOYSA-L 0.000 claims description 4
- 238000001816 cooling Methods 0.000 claims description 4
- 238000002156 mixing Methods 0.000 claims description 4
- 238000005406 washing Methods 0.000 claims description 4
- JKIJEFPNVSHHEI-UHFFFAOYSA-N Phenol, 2,4-bis(1,1-dimethylethyl)-, phosphite (3:1) Chemical group CC(C)(C)C1=CC(C(C)(C)C)=CC=C1OP(OC=1C(=CC(=CC=1)C(C)(C)C)C(C)(C)C)OC1=CC=C(C(C)(C)C)C=C1C(C)(C)C JKIJEFPNVSHHEI-UHFFFAOYSA-N 0.000 claims description 3
- BGYHLZZASRKEJE-UHFFFAOYSA-N [3-[3-(3,5-ditert-butyl-4-hydroxyphenyl)propanoyloxy]-2,2-bis[3-(3,5-ditert-butyl-4-hydroxyphenyl)propanoyloxymethyl]propyl] 3-(3,5-ditert-butyl-4-hydroxyphenyl)propanoate Chemical compound CC(C)(C)C1=C(O)C(C(C)(C)C)=CC(CCC(=O)OCC(COC(=O)CCC=2C=C(C(O)=C(C=2)C(C)(C)C)C(C)(C)C)(COC(=O)CCC=2C=C(C(O)=C(C=2)C(C)(C)C)C(C)(C)C)COC(=O)CCC=2C=C(C(O)=C(C=2)C(C)(C)C)C(C)(C)C)=C1 BGYHLZZASRKEJE-UHFFFAOYSA-N 0.000 claims description 3
- FPAFDBFIGPHWGO-UHFFFAOYSA-N dioxosilane;oxomagnesium;hydrate Chemical compound O.[Mg]=O.[Mg]=O.[Mg]=O.O=[Si]=O.O=[Si]=O.O=[Si]=O.O=[Si]=O FPAFDBFIGPHWGO-UHFFFAOYSA-N 0.000 claims description 3
- 238000001914 filtration Methods 0.000 claims description 3
- 229920000092 linear low density polyethylene Polymers 0.000 claims description 3
- 239000004707 linear low-density polyethylene Substances 0.000 claims description 3
- 230000001105 regulatory effect Effects 0.000 claims description 3
- 229920002943 EPDM rubber Polymers 0.000 claims description 2
- 229920003171 Poly (ethylene oxide) Polymers 0.000 claims description 2
- 238000007605 air drying Methods 0.000 claims description 2
- 229910000019 calcium carbonate Inorganic materials 0.000 claims description 2
- CJZGTCYPCWQAJB-UHFFFAOYSA-L calcium stearate Chemical compound [Ca+2].CCCCCCCCCCCCCCCCCC([O-])=O.CCCCCCCCCCCCCCCCCC([O-])=O CJZGTCYPCWQAJB-UHFFFAOYSA-L 0.000 claims description 2
- 239000008116 calcium stearate Substances 0.000 claims description 2
- 235000013539 calcium stearate Nutrition 0.000 claims description 2
- 238000013329 compounding Methods 0.000 claims description 2
- 229920001903 high density polyethylene Polymers 0.000 claims description 2
- 239000004700 high-density polyethylene Substances 0.000 claims description 2
- 229910052943 magnesium sulfate Inorganic materials 0.000 claims description 2
- 235000019341 magnesium sulphate Nutrition 0.000 claims description 2
- 239000000155 melt Substances 0.000 claims description 2
- 238000002844 melting Methods 0.000 claims description 2
- 230000008018 melting Effects 0.000 claims description 2
- 239000010445 mica Substances 0.000 claims description 2
- 229910052618 mica group Inorganic materials 0.000 claims description 2
- 238000002715 modification method Methods 0.000 claims description 2
- QIQXTHQIDYTFRH-UHFFFAOYSA-N octadecanoic acid Chemical compound CCCCCCCCCCCCCCCCCC(O)=O QIQXTHQIDYTFRH-UHFFFAOYSA-N 0.000 claims description 2
- SSDSCDGVMJFTEQ-UHFFFAOYSA-N octadecyl 3-(3,5-ditert-butyl-4-hydroxyphenyl)propanoate Chemical compound CCCCCCCCCCCCCCCCCCOC(=O)CCC1=CC(C(C)(C)C)=C(O)C(C(C)(C)C)=C1 SSDSCDGVMJFTEQ-UHFFFAOYSA-N 0.000 claims description 2
- 229920001935 styrene-ethylene-butadiene-styrene Polymers 0.000 claims description 2
- 239000010456 wollastonite Substances 0.000 claims description 2
- 229910052882 wollastonite Inorganic materials 0.000 claims description 2
- XOOUIPVCVHRTMJ-UHFFFAOYSA-L zinc stearate Chemical compound [Zn+2].CCCCCCCCCCCCCCCCCC([O-])=O.CCCCCCCCCCCCCCCCCC([O-])=O XOOUIPVCVHRTMJ-UHFFFAOYSA-L 0.000 claims description 2
- 229920005629 polypropylene homopolymer Polymers 0.000 claims 1
- 239000011347 resin Substances 0.000 abstract description 17
- 229920005989 resin Polymers 0.000 abstract description 17
- 239000000758 substrate Substances 0.000 abstract description 8
- 230000000694 effects Effects 0.000 abstract description 7
- 230000002195 synergetic effect Effects 0.000 abstract description 2
- 239000000243 solution Substances 0.000 description 11
- 238000012360 testing method Methods 0.000 description 9
- 230000001070 adhesive effect Effects 0.000 description 6
- 239000000463 material Substances 0.000 description 6
- 239000002994 raw material Substances 0.000 description 6
- 239000000853 adhesive Substances 0.000 description 5
- 239000006229 carbon black Substances 0.000 description 4
- 230000000052 comparative effect Effects 0.000 description 4
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 3
- 239000003153 chemical reaction reagent Substances 0.000 description 2
- 239000000047 product Substances 0.000 description 2
- 239000007983 Tris buffer Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 238000009835 boiling Methods 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 239000012612 commercial material Substances 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 229920001577 copolymer Polymers 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000012847 fine chemical Substances 0.000 description 1
- 238000005469 granulation Methods 0.000 description 1
- 230000003179 granulation Effects 0.000 description 1
- 231100000053 low toxicity Toxicity 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 239000012466 permeate Substances 0.000 description 1
- 239000000049 pigment Substances 0.000 description 1
- 239000002861 polymer material Substances 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000012827 research and development Methods 0.000 description 1
- 238000007592 spray painting technique Methods 0.000 description 1
- 229910052623 talc Inorganic materials 0.000 description 1
- LENZDBCJOHFCAS-UHFFFAOYSA-N tris Chemical compound OCC(N)(CO)CO LENZDBCJOHFCAS-UHFFFAOYSA-N 0.000 description 1
- 238000005303 weighing Methods 0.000 description 1
Landscapes
- Manufacture Of Porous Articles, And Recovery And Treatment Of Waste Products (AREA)
- Paints Or Removers (AREA)
Abstract
The invention discloses a polypropylene composite material capable of being used for high-efficiency spraying of water paint and a preparation method thereof, wherein the polypropylene composite material is prepared from 45-61 parts of conventional polypropylene, 5-20 parts of porous polypropylene, 5-15 parts of toughening agent, 15-30 parts of inorganic filler, 2-10 parts of modified nano cellulose fiber, 0.2-0.4 part of antioxidant, 0.1-0.3 part of lubricant and 0.2-0.6 part of toner according to parts by weight; wherein the modified nano cellulose fiber is a nano cellulose fiber subjected to dopamine surface modification treatment. The surface of the nanocellulose is modified by the dopamine, so that the compatibility of the nanocellulose and the polypropylene resin is improved, the water paint is easier to penetrate into the resin under the synergistic effect of the porous polypropylene, the water paint is well solidified on the surface of a substrate, and the high-efficiency spraying use effect of the water paint on the polypropylene composite material is met.
Description
Technical Field
The invention relates to the technical field of high polymer material modification, in particular to a polypropylene composite material capable of being used for high-efficiency spraying of water paint and a preparation method thereof.
Background
The polypropylene resin is widely applied to automobiles, household appliances and other industries due to a series of advantages of low price, excellent mechanical properties, simple processing and molding process and the like. In particular in the field of automobiles, the whole interior and exterior trim such as bumpers, door panels, upright posts and other parts relate to polypropylene resin materials, and according to statistics, the dosage of polypropylene resin of a bicycle reaches more than 50kg at present, but the exterior trim parts of the automobiles such as bumpers generally relate to a surface spraying process, oil paint spraying is mainly adopted in the past, and in recent years, water paint is gradually pushed to be used along with the enhancement of environmental awareness of people. The water paint has the advantages of low toxicity, difficult ignition and the like, but the water paint has poor wettability and dispersibility on pigments and substrates due to high surface tension, and has poor penetrability on resin substrates compared with oil paint, so the water paint has no oil paint in the aspect of adhesion to the substrates. In order to improve the penetrability and adhesive force of the water paint to the resin substrate, on one hand, the research and development of high-end water paint needs to be enhanced, and on the other hand, a composite polypropylene material which can be matched with the water paint better needs to be made, so that the development of the polypropylene composite material which can be used for high-efficiency spraying of the water paint has important significance.
Disclosure of Invention
In view of the above, the invention provides a polypropylene composite material capable of being used for high-efficiency spraying of water paint and a preparation method thereof, so as to solve the problems in the prior art, and the compatibility of the nano cellulose with polypropylene resin is improved by carrying out surface modification on the nano cellulose by dopamine, and on one hand, the nano cellulose has good compatibility with the water paint by utilizing the surface hydroxyl activity of the nano cellulose, so that the adhesive force between the water paint and the resin surface is improved; on the other hand, under the synergistic effect of porous polypropylene, the water paint is easier to permeate into the resin, so that the water paint is well solidified on the surface of the substrate, and the high-efficiency spraying use effect of the water paint on the polypropylene composite material is met.
In order to achieve the above purpose, the present invention provides the following technical solutions:
the invention discloses a polypropylene composite material capable of being used for high-efficiency spraying of water paint, which is prepared from 45-61 parts of conventional polypropylene, 5-20 parts of porous polypropylene, 5-15 parts of toughening agent, 15-30 parts of inorganic filler, 2-10 parts of modified nano cellulose fiber, 0.2-0.4 part of antioxidant, 0.1-0.3 part of lubricant and 0.2-0.6 part of toner according to parts by weight; wherein the modified nano cellulose fiber is a nano cellulose fiber subjected to dopamine surface modification treatment.
As a further scheme of the invention: the conventional polypropylene is at least one of copolymer polypropylene and homopolymerized polypropylene, and the melt index of the conventional polypropylene is 5-100 g/10min under the condition of 230 ℃/2.16 kg.
As a further scheme of the invention: the porosity of the porous polypropylene is 10-30%.
As a further scheme of the invention: the toughening agent is at least one of POE, EPDM, HDPE, LLDPE, SEBS.
As a further scheme of the invention: the inorganic filler is at least one of talcum powder, calcium carbonate, wollastonite, mica and magnesium sulfate whisker.
As a further scheme of the invention: the modification method of the modified nano cellulose fiber comprises the following steps:
placing the nano cellulose fiber into a dopamine solution, stirring and reacting for 1-3 hours, regulating the pH value of the system to 8-9, continuously stirring and reacting for 3-6 hours, filtering, washing and drying to obtain the modified nano cellulose fiber;
wherein the concentration of the dopamine solution is 1-2 g/L, and the dosage ratio of the modified nano cellulose fiber to the dopamine solution is 1g (20-40 mL).
As a further scheme of the invention: the antioxidant is formed by compounding a primary antioxidant and an auxiliary antioxidant, wherein the primary antioxidant is one of antioxidant 1010 or antioxidant 1076, and the auxiliary antioxidant is antioxidant 168.
As a further scheme of the invention: the lubricant is at least one of calcium stearate, zinc stearate and stearate.
The invention also discloses a preparation method of the polypropylene composite material capable of being used for high-efficiency spraying of the water paint, which comprises the following steps:
and uniformly mixing the conventional polypropylene, the porous polypropylene, the toughening agent, the modified nano cellulose fiber, the inorganic filler, the antioxidant, the lubricant and the toner according to parts by weight, putting into a double-screw extruder, melting, extruding, water-cooling, air-drying, granulating, and baking at 80-100 ℃ for 2-6 hours to obtain the high-efficiency spray-coating polypropylene composite material of the water paint.
As a further scheme of the invention: the extrusion temperature of each interval in the double-screw extruder is 80+/-10 ℃, 190+/-10 ℃, 200+/-10 ℃, 210+/-10 ℃, 200+/-10 ℃, the screw rotating speed is 350-450 r/min, and the length-diameter ratio of the double-screw extruder is (36-48): 1, the vacuum degree in the extrusion process is-0.05 to-0.1 MPa, and a double-layer 80-120-mesh filter screen is arranged at the head of the extruder.
Compared with the prior art, the invention has the beneficial effects that:
(1) According to the invention, the surface of the nanocellulose is modified by using the dopamine, so that the compatibility of the nanocellulose with the polypropylene resin is improved, and the surface hydroxyl activity of the nanocellulose fiber is utilized, so that the nanocellulose has good compatibility with the water paint, and the adhesive force between the water paint and the resin surface is improved.
(2) According to the invention, the porous polypropylene raw material is introduced, the surface of the polypropylene raw material has a porous structure, and after the polypropylene raw material is made into a composite material, the surface porous structure of the composite material can be continuously maintained, so that the water paint can more easily penetrate into the resin, the water paint can be well solidified on the surface of a substrate, and the high-efficiency spraying use effect of the water paint on the polypropylene composite material is satisfied.
Detailed Description
In order that the invention may be readily understood, a more particular description of the invention will be rendered by reference to specific embodiments that are illustrated below. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.
Specific information of the raw materials used in the following examples and comparative examples are as follows:
polypropylene, selected from the group consisting of co-polypropylene, brand BX3800, commercially available from SK, korea;
porous polypropylene, brand Hifax CA 7153S, having a porosity of 23% vol and an apparent density of 0.36kg/dm 3 Purchased from basel;
the brand of nano cellulose fiber (CNF for short) is MFC, and the manufacturer is Zhejiang Hangzhou new material science and technology Co., ltd;
the talcum powder brand is AHCP250, and the manufacturer is Liaoning Ai Hai talcum Co., ltd;
the POE brand is LC565, and the manufacturer is LG chemistry;
LLDPE brand 7042, manufacturer is Zhongan Union;
antioxidant 1010, manufacturer is basf;
antioxidant 168, manufacturer is basf;
the carbon black is marked as X30B, and the manufacturer is Dexin fine chemical engineering Co., ltd;
the antioxidant is a compound system of 1010 and 168 in a weight ratio of 1:2.
The toner is carbon black;
dopamine solutions were purchased from the national pharmaceutical company, state rui pharmaceutical company, ltd.
Other dopamine, antioxidants, lubricants and carbon black are all conventional commercial materials.
All materials are commercially available conventional and commonly used products.
It will be appreciated that the above raw material reagents are only examples of some embodiments of the invention, so that the technical solution of the invention is more clear, and it is not represented that the invention can only employ the above reagents, and the scope of the claims is in particular. In addition, "parts" described in examples and comparative examples refer to parts by weight unless otherwise specified.
Any range recited in the invention includes any numerical value between the endpoints and any sub-range of any numerical value between the endpoints or any numerical value between the endpoints.
Examples 1-5 were performed as follows:
(1) Preparing a dopamine solution with the concentration of 1.5g/L, placing the nanocellulose fibers in the dopamine solution, mixing the nanocellulose fibers and the dopamine solution at the ratio of 1g to 30ml, stirring and reacting for 2 hours, adding a Tris buffer solution into the nanocellulose fibers-dopamine solution, regulating the pH value of the system to 8.5, continuing stirring and reacting for 5 hours, and then filtering, washing and drying to obtain the modified nanocellulose fibers.
(2) Weighing the components according to the proportion in the table 1, and sequentially adding all the components into a high-speed mixing pot to mix for 3 minutes to obtain premix. And then adding the premix into a double-screw extruder from a main feeding port, performing melt extrusion, cooling and granulation, and baking for 4 hours at 90 ℃ in a baking tank to obtain the polypropylene composite material for high-efficiency spraying of the water paint. Wherein, the rotating speed of the double-screw extruder is set to 400rpm, and the temperature from the feeding section to the machine head is respectively 80 ℃,190 ℃,200 ℃,210 ℃,210 ℃,210 ℃,200 ℃,200 ℃,200 ℃ and 200 ℃. The screw rotation speed is 400r/min, and the length-diameter ratio of the double screw extruder is 40:1, the vacuum degree in the extrusion process is-0.08 MPa, and a 100-mesh filter screen is arranged on the head of the extruder.
Preparing a test template with the size of 210 x 140 x 2.5mm from the obtained polypropylene composite material for high-efficiency spraying of the water paint, spraying the water paint, wherein the water paint is selected from the east coating onwaves brand, and the specific spray painting process flow is as follows: washing the surface of a sample, blowing water, drying, spraying the sample on the surface of a sample plate for 3 times in a left-right reciprocating manner by using a spraying tool, then drying the sample in an oven at 80 ℃ for 30min, taking out the sample, cooling the sample, and standing the sample at room temperature for 48h, wherein the thickness of a paint film on the surface is about 0.1mm; all the tests in Table 2 were then carried out, wherein the instrument used for the water resistance test was a constant temperature digital display water bath, the water bath temperature being 40.+ -. 2 ℃. The results obtained are shown in Table 2.
TABLE 1
TABLE 2
As can be seen from the test results in tables 1 and 2, the invention obtains the high-efficiency spray-coating polypropylene composite material of the water paint by using the conventional polypropylene, the porous polypropylene, the modified nano cellulose fiber, the inorganic filler, the toughening agent, the antioxidant, the lubricant and the carbon black in a matched manner according to a specific proportion. As can be seen from the test results of the embodiment 1 and the comparative examples 1-2, the invention adopts dopamine to carry out surface modification on the nano cellulose fiber, can effectively improve the compatibility with polypropylene resin, and utilizes the surface hydroxyl activity of the nano cellulose to ensure that the nano cellulose has good compatibility with water paint, thereby improving the adhesive force between the water paint and the resin surface, and also obviously improving the mechanical property of the polypropylene composite material; as can be seen from example 1 and comparative example 3, after the porous polypropylene raw material is introduced, the porous structure of the surface of the material can be continuously maintained, so that the water paint can more easily penetrate into the resin, and the water paint can be well solidified on the surface of the substrate; the modified nanocellulose fibers and the porous polypropylene are combined for use, the adhesive force of the water paint and the resin base material is improved in the early stage, the penetrating power of the water paint is improved, the high-efficiency spraying use effect of the water paint on the polypropylene composite material is effectively improved, the extremely strong adhesive effect is shown, and the water boiling resistance test, the hundred grid test and the steam spraying test all achieve the strict test of a paint spraying product.
Although the present disclosure describes embodiments, not every embodiment is described in terms of a single embodiment, and such description is for clarity only, and one skilled in the art will recognize that the embodiments described in the disclosure as a whole may be combined appropriately to form other embodiments that will be apparent to those skilled in the art.
Therefore, the above description is only of the preferred embodiments of the present application and is not intended to limit the scope of the present application; all changes which come within the meaning and range of equivalency of the claims are to be embraced within their scope.
Claims (10)
1. The polypropylene composite material capable of being used for high-efficiency spraying of water paint is characterized by being prepared from 45-61 parts of conventional polypropylene, 5-20 parts of porous polypropylene, 5-15 parts of toughening agent, 15-30 parts of inorganic filler, 2-10 parts of modified nano cellulose fiber, 0.2-0.4 part of antioxidant, 0.1-0.3 part of lubricant and 0.2-0.6 part of toner according to parts by weight; wherein the modified nano cellulose fiber is a nano cellulose fiber subjected to dopamine surface modification treatment.
2. The polypropylene composite material for high-efficiency spraying of water paint according to claim 1, wherein the conventional polypropylene is at least one of copolymerized polypropylene and homo-polypropylene, and has a melt index of 5-100 g/10min at 230 ℃/2.16 kg.
3. The polypropylene composite material for high-efficiency spraying of water paint according to claim 1, wherein the porosity of the porous polypropylene is 10-30%.
4. The polypropylene composite material for high efficiency spraying of water based paint according to claim 1, wherein the toughening agent is at least one of POE, EPDM, HDPE, LLDPE, SEBS.
5. The polypropylene composite material capable of being used for high-efficiency spraying of water paint according to claim 1, wherein the inorganic filler is at least one of talcum powder, calcium carbonate, wollastonite, mica and magnesium sulfate whisker.
6. The polypropylene composite material capable of being used for high-efficiency spraying of water paint according to claim 1, wherein the modification method of the modified nano cellulose fiber comprises the following steps:
placing the nano cellulose fiber into a dopamine solution, stirring and reacting for 1-3 hours, regulating the pH value of the system to 8-9, continuously stirring and reacting for 3-6 hours, filtering, washing and drying to obtain the modified nano cellulose fiber;
wherein the concentration of the dopamine solution is 1-2 g/L, and the dosage ratio of the modified nano cellulose fiber to the dopamine solution is 1g (20-40 mL).
7. The polypropylene composite material capable of being used for high-efficiency spraying of water paint according to claim 1, wherein the antioxidant is formed by compounding a main antioxidant and an auxiliary antioxidant, the main antioxidant is one of antioxidant 1010 or antioxidant 1076, and the auxiliary antioxidant is antioxidant 168.
8. The polypropylene composite material for high-efficiency spraying of water paint according to claim 1, wherein the lubricant is at least one of calcium stearate, zinc stearate and stearate.
9. A method for preparing a polypropylene composite material for high-efficiency spraying of water paint according to any one of claims 1 to 8, comprising the steps of:
and uniformly mixing the conventional polypropylene, the porous polypropylene, the toughening agent, the modified nano cellulose fiber, the inorganic filler, the antioxidant, the lubricant and the toner according to parts by weight, putting into a double-screw extruder, melting, extruding, water-cooling, air-drying, granulating, and baking at 80-100 ℃ for 2-6 hours to obtain the high-efficiency spray-coating polypropylene composite material of the water paint.
10. The method of claim 9, wherein the extrusion temperatures in the respective zones of the twin-screw extruder are sequentially 80±10 ℃,190±10 ℃,200±10 ℃,210±10 ℃,200±10 ℃, and 200±10 ℃ at a screw speed of 350 to 450r/min, and the aspect ratio of the twin-screw extruder is (36 to 48): 1, the vacuum degree in the extrusion process is-0.05 to-0.1 MPa, and a double-layer 80-120-mesh filter screen is arranged at the head of the extruder.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311780448.5A CN117777603A (en) | 2023-12-22 | 2023-12-22 | Polypropylene composite material capable of being used for high-efficiency spraying of water paint and preparation method thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311780448.5A CN117777603A (en) | 2023-12-22 | 2023-12-22 | Polypropylene composite material capable of being used for high-efficiency spraying of water paint and preparation method thereof |
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| Publication Number | Publication Date |
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| CN117777603A true CN117777603A (en) | 2024-03-29 |
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| CN202311780448.5A Pending CN117777603A (en) | 2023-12-22 | 2023-12-22 | Polypropylene composite material capable of being used for high-efficiency spraying of water paint and preparation method thereof |
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| Country | Link |
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