CN113150449A - Low-shrinkage laser-weldable polypropylene modified composite material and preparation method thereof - Google Patents
Low-shrinkage laser-weldable polypropylene modified composite material and preparation method thereof Download PDFInfo
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- 239000004743 Polypropylene Substances 0.000 title claims abstract description 42
- 229920001155 polypropylene Polymers 0.000 title claims abstract description 42
- -1 polypropylene Polymers 0.000 title claims abstract description 39
- 238000002360 preparation method Methods 0.000 title claims description 8
- 239000002131 composite material Substances 0.000 title description 9
- 239000000463 material Substances 0.000 claims abstract description 25
- VLLMWSRANPNYQX-UHFFFAOYSA-N thiadiazole Chemical compound C1=CSN=N1.C1=CSN=N1 VLLMWSRANPNYQX-UHFFFAOYSA-N 0.000 claims abstract description 12
- 239000003963 antioxidant agent Substances 0.000 claims abstract description 10
- 239000011256 inorganic filler Substances 0.000 claims abstract description 10
- 229910003475 inorganic filler Inorganic materials 0.000 claims abstract description 10
- 239000004611 light stabiliser Substances 0.000 claims abstract description 10
- 239000000314 lubricant Substances 0.000 claims abstract description 10
- 230000003078 antioxidant effect Effects 0.000 claims abstract description 8
- 239000012745 toughening agent Substances 0.000 claims abstract description 8
- 239000013543 active substance Substances 0.000 claims abstract description 7
- 229920001911 maleic anhydride grafted polypropylene Polymers 0.000 claims abstract description 7
- 238000002156 mixing Methods 0.000 claims description 14
- 238000012360 testing method Methods 0.000 claims description 10
- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 claims description 8
- 239000000047 product Substances 0.000 claims description 8
- 239000000155 melt Substances 0.000 claims description 7
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 claims description 6
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 6
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 claims description 6
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 claims description 6
- 150000001412 amines Chemical class 0.000 claims description 6
- 239000012043 crude product Substances 0.000 claims description 6
- 239000000843 powder Substances 0.000 claims description 6
- 239000002245 particle Substances 0.000 claims description 5
- 239000002994 raw material Substances 0.000 claims description 5
- 238000003756 stirring Methods 0.000 claims description 5
- 238000001125 extrusion Methods 0.000 claims description 4
- 238000005469 granulation Methods 0.000 claims description 4
- 230000003179 granulation Effects 0.000 claims description 4
- 239000011787 zinc oxide Substances 0.000 claims description 4
- BIGYLAKFCGVRAN-UHFFFAOYSA-N 1,3,4-thiadiazolidine-2,5-dithione Chemical group S=C1NNC(=S)S1 BIGYLAKFCGVRAN-UHFFFAOYSA-N 0.000 claims description 3
- FEHDLMJLTHKGJQ-UHFFFAOYSA-N C1(CC(=O)OC(C2=CC=CC=C2)O1)=O.N1=NN=CC=C1 Chemical compound C1(CC(=O)OC(C2=CC=CC=C2)O1)=O.N1=NN=CC=C1 FEHDLMJLTHKGJQ-UHFFFAOYSA-N 0.000 claims description 3
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 3
- ISWSIDIOOBJBQZ-UHFFFAOYSA-N Phenol Chemical compound OC1=CC=CC=C1 ISWSIDIOOBJBQZ-UHFFFAOYSA-N 0.000 claims description 3
- 235000021355 Stearic acid Nutrition 0.000 claims description 3
- 150000001408 amides Chemical class 0.000 claims description 3
- RWCCWEUUXYIKHB-UHFFFAOYSA-N benzophenone Chemical compound C=1C=CC=CC=1C(=O)C1=CC=CC=C1 RWCCWEUUXYIKHB-UHFFFAOYSA-N 0.000 claims description 3
- 239000012965 benzophenone Substances 0.000 claims description 3
- QRUDEWIWKLJBPS-UHFFFAOYSA-N benzotriazole Chemical compound C1=CC=C2N[N][N]C2=C1 QRUDEWIWKLJBPS-UHFFFAOYSA-N 0.000 claims description 3
- 239000012964 benzotriazole Substances 0.000 claims description 3
- 229910000019 calcium carbonate Inorganic materials 0.000 claims description 3
- 229920001577 copolymer Polymers 0.000 claims description 3
- 239000013078 crystal Substances 0.000 claims description 3
- 239000008367 deionised water Substances 0.000 claims description 3
- 229910021641 deionized water Inorganic materials 0.000 claims description 3
- 235000014113 dietary fatty acids Nutrition 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
- 150000002148 esters Chemical class 0.000 claims description 3
- FWDBOZPQNFPOLF-UHFFFAOYSA-N ethenyl(triethoxy)silane Chemical compound CCO[Si](OCC)(OCC)C=C FWDBOZPQNFPOLF-UHFFFAOYSA-N 0.000 claims description 3
- 239000000194 fatty acid Substances 0.000 claims description 3
- 229930195729 fatty acid Natural products 0.000 claims description 3
- 150000004665 fatty acids Chemical class 0.000 claims description 3
- 239000010445 mica Substances 0.000 claims description 3
- 229910052618 mica group Inorganic materials 0.000 claims description 3
- 229910052757 nitrogen Inorganic materials 0.000 claims description 3
- QIQXTHQIDYTFRH-UHFFFAOYSA-N octadecanoic acid Chemical compound CCCCCCCCCCCCCCCCCC(O)=O QIQXTHQIDYTFRH-UHFFFAOYSA-N 0.000 claims description 3
- OQCDKBAXFALNLD-UHFFFAOYSA-N octadecanoic acid Natural products CCCCCCCC(C)CCCCCCCCC(O)=O OQCDKBAXFALNLD-UHFFFAOYSA-N 0.000 claims description 3
- 125000002080 perylenyl group Chemical group C1(=CC=C2C=CC=C3C4=CC=CC5=CC=CC(C1=C23)=C45)* 0.000 claims description 3
- CSHWQDPOILHKBI-UHFFFAOYSA-N peryrene Natural products C1=CC(C2=CC=CC=3C2=C2C=CC=3)=C3C2=CC=CC3=C1 CSHWQDPOILHKBI-UHFFFAOYSA-N 0.000 claims description 3
- 229920005629 polypropylene homopolymer Polymers 0.000 claims description 3
- 239000002904 solvent Substances 0.000 claims description 3
- 239000008117 stearic acid Substances 0.000 claims description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 3
- 239000010456 wollastonite Substances 0.000 claims description 3
- 229910052882 wollastonite Inorganic materials 0.000 claims description 3
- OJMIONKXNSYLSR-UHFFFAOYSA-N phosphorous acid Chemical compound OP(O)O OJMIONKXNSYLSR-UHFFFAOYSA-N 0.000 claims description 2
- 238000004519 manufacturing process Methods 0.000 claims 2
- 238000001035 drying Methods 0.000 claims 1
- 239000003973 paint Substances 0.000 claims 1
- 238000003466 welding Methods 0.000 abstract description 28
- 239000004033 plastic Substances 0.000 abstract description 9
- 229920003023 plastic Polymers 0.000 abstract description 9
- 238000005516 engineering process Methods 0.000 abstract description 4
- 230000000052 comparative effect Effects 0.000 description 9
- 239000000203 mixture Substances 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- 238000002834 transmittance Methods 0.000 description 4
- 238000000034 method Methods 0.000 description 3
- 238000004821 distillation Methods 0.000 description 2
- 238000002347 injection Methods 0.000 description 2
- 239000007924 injection Substances 0.000 description 2
- 238000001746 injection moulding Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 230000002195 synergetic effect Effects 0.000 description 2
- 238000005303 weighing Methods 0.000 description 2
- 208000009205 Tinnitus Diseases 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000004132 cross linking Methods 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 238000009472 formulation Methods 0.000 description 1
- 230000008595 infiltration Effects 0.000 description 1
- 238000001764 infiltration Methods 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 150000008301 phosphite esters Chemical class 0.000 description 1
- 239000002861 polymer material Substances 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 238000010561 standard procedure Methods 0.000 description 1
- 229920001169 thermoplastic Polymers 0.000 description 1
- 239000004416 thermosoftening plastic Substances 0.000 description 1
- 231100000886 tinnitus Toxicity 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L23/00—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
- C08L23/02—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers not modified by chemical after-treatment
- C08L23/10—Homopolymers or copolymers of propene
- C08L23/14—Copolymers of propene
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/20—Oxides; Hydroxides
- C08K3/22—Oxides; Hydroxides of metals
- C08K2003/2296—Oxides; Hydroxides of metals of zinc
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K2201/00—Specific properties of additives
- C08K2201/002—Physical properties
- C08K2201/005—Additives being defined by their particle size in general
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K2201/00—Specific properties of additives
- C08K2201/011—Nanostructured additives
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2201/00—Properties
- C08L2201/10—Transparent films; Clear coatings; Transparent materials
Landscapes
- Chemical & Material Sciences (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Compositions Of Macromolecular Compounds (AREA)
Abstract
The invention discloses a low-shrinkage laser-weldable modified polypropylene material which comprises the following components in parts by weight: 50-90 parts of polypropylene, 10-30 parts of inorganic filler, 4-10 parts of toughening agent, 0.2-1.5 parts of maleic anhydride grafted polypropylene, 1-3 parts of thiadiazole, 0.3-0.8 part of active agent, 0.5-2.0 parts of cage-shaped octavinyl silsesquioxane, 0.3-0.9 part of antioxidant, 0.3-1.5 parts of lubricant, 0.1-0.5 part of light stabilizer and 0.1-1 part of light-transmitting black toner. The polypropylene material prepared by the invention can meet the requirement of laser welding, has very low shrinkage rate, has excellent mechanical properties, breaks through the performance bottleneck of the existing product, and expands the application field of the laser welding technology on automobile plastic parts.
Description
Technical Field
The invention belongs to the technical field of high polymer materials, and particularly relates to a low-shrinkage laser-weldable polypropylene modified material and a preparation method thereof.
Background
At present, the traditional welding mode of plastic parts is mainly ultrasonic welding, and the method generates heat at a joint interface through mechanical high-frequency vibration so as to realize welding. The ultrasonic welding process is mature, the remote processing can be carried out, the equipment cost is low, the practicability to materials is wide, and the like. However, ultrasonic welding also has significant disadvantages, such as: when the surface coating of the product or the adhesion force of the electronic element is insufficient, the product can fall off due to mechanical high-frequency vibration generated by ultrasonic waves; ultrasonic welding can produce noise and tinnitus can be produced when the ultrasonic welding environment is operated for a long time.
Laser welding is a welding technique emerging in the automobile industry in recent years, and melts plastic contact surfaces by heat generated by a laser beam, so that parts are bonded together. Two-layer thermoplastic overlap joint together, and upper plastic has higher transmissivity to laser, and lower floor's plastics have higher absorptivity to laser wavelength, and laser sees through upper material like this, is absorbed by the surface of lower floor's plastics, and the heat that produces makes upper and lower floor's plastics melt at contact interface department, and then because molecular diffusion, forms instantaneous infiltration welding seam at upper and lower floor's material interface to accomplish the welding. The laser wavelength currently used for laser welding is mainly concentrated between 900nm and 1100 nm.
The previously reported laser welding polypropylene modified material has good rigidity and toughness balance, but has a relatively limited shrinkage rate, and cannot meet the requirements of many parts of automobiles, so that the application of a laser welding technology in the field of automobile interior and exterior trim is greatly limited. In view of the above, there is an urgent need for a polypropylene composite material with low shrinkage, laser welding capability and good near-infrared laser permeability, which can be widely applied in the field of bonding of interior and exterior parts of automobiles by laser welding.
Disclosure of Invention
The invention aims to solve the technical problem of providing a low-shrinkage laser-weldable polypropylene modified material and a preparation method thereof.
A low-shrinkage laser-weldable polypropylene modified material comprises the following components in parts by weight:
50-90 parts of polypropylene;
10-30 parts of inorganic filler;
4-10 parts of a toughening agent;
maleic anhydride grafted polypropylene: 0.2-1.5 parts;
1-3 parts of thiadiazole;
0.3-0.8 part of active agent;
0.5-2.0 parts of cage-shaped octavinyl silsesquioxane;
0.3-0.9 part of antioxidant;
0.3-1.5 parts of a lubricant;
0.1-0.5 part of light stabilizer;
0.1-1 part of light-transmitting black powder.
According to a further technical scheme, the polypropylene is homo-polypropylene or co-polypropylene; the melt index is 1-60g/10min, the test conditions are 230 ℃ and 2.16 kg.
In a further technical scheme, the inorganic filler is one or more of calcium carbonate, talcum powder, mica, wollastonite and the like, and the average particle size of the inorganic filler is 1-10 um.
According to a further technical scheme, the toughening agent is an ethylene-octene copolymer; the melt index is 0.5-20g/10min, and the test conditions are 190 ℃ and 2.16 kg.
According to a further technical scheme, the grafting rate of the maleic anhydride grafted polypropylene is 0.6-2.0 wt%.
In a further technical scheme, the thiadiazole is 2, 5-dimercapto-1, 3, 4-thiadiazole.
In a further technical scheme, the active agent is active zinc oxide, the chemical activity is high, and the particle size is 10-40 nm.
According to the further technical scheme, 60 parts of vinyl triethoxysilane is dissolved in 120 parts of absolute ethyl alcohol, 20 parts of deionized water is added after the mixture is fully stirred, concentrated hydrochloric acid is slowly dripped, the pH value of the system is adjusted to 2-3, the mixture reacts for 10 hours under the protection of nitrogen, and the solvent is removed through reduced pressure distillation at normal temperature to obtain a crude product; the crude product was recrystallized from acetone to give needle-like white crystals, which were dried at 70 ℃ for 2h to give a white powder product.
In a further technical scheme, the antioxidant is at least one of amine, phosphite ester and hindered phenol antioxidant.
According to a further technical scheme, the lubricant is at least one of amide, stearic acid, fatty acid and ester lubricant.
According to a further technical scheme, the light stabilizer is at least one of hindered amine, benzotriazole, benzophenone and triazine benzylidene malonate light stabilizers.
According to a further technical scheme, the light-transmitting black toner is perylene black toner.
A preparation method of a low-shrinkage laser-weldable polypropylene modified material comprises the following steps:
weighing the materials in parts by weight, putting the materials into a high-speed stirrer for stirring and mixing, adding the mixed raw materials into a double-screw extruder, and carrying out melt blending and extrusion granulation at the temperature of 180-230 ℃ to obtain the laser-weldable modified polypropylene material. The mixing speed is 400-1000 r/min, and the mixing time is 3-7 min.
Advantageous effects
1. According to the invention, the thiadiazole is activated through the active zinc oxide, so that the polypropylene is crosslinked, and the density of crosslinking points is increased under the synergistic effect of the cage-shaped octavinyl silsesquioxane, so that the creep resistance of the polypropylene material is improved, and the shrinkage rate of the material is reduced.
2. The cage-shaped octavinyl silsesquioxane disclosed by the invention can also improve the dispersion of light-transmitting black toner, so that the transmittance of a polypropylene material in near infrared light is improved, the laser welding efficiency is improved, and the application field of a laser welding technology in plastic parts on automobiles is greatly widened.
3. The polypropylene composite material prepared by the invention can meet the requirement of laser welding, has very low shrinkage rate, has excellent mechanical properties, breaks through the performance bottleneck of the existing product, and expands the application field of the laser welding technology on automobile plastic parts.
Detailed Description
The invention will be further illustrated with reference to the following specific examples. It should be understood that these examples are for illustrative purposes only and are not intended to limit the scope of the present invention. Further, it should be understood that various changes or modifications of the present invention may be made by those skilled in the art after reading the teaching of the present invention, and such equivalents may fall within the scope of the present invention as defined in the appended claims.
A low-shrinkage laser-weldable polypropylene modified material comprises the following components in parts by weight:
50-90 parts of polypropylene;
10-30 parts of inorganic filler;
4-10 parts of a toughening agent;
maleic anhydride grafted polypropylene: 0.2-1.5 parts;
1-3 parts of thiadiazole;
0.3-0.8 part of active agent;
0.5-2.0 parts of cage-shaped octavinyl silsesquioxane;
0.3-0.9 part of antioxidant;
0.3-1.5 parts of a lubricant;
0.1-0.5 part of light stabilizer;
0.1-1 part of light-transmitting black powder.
The polypropylene is homo-polypropylene or co-polypropylene; the melt index is 1-60g/10min, the test conditions are 230 ℃ and 2.16 kg.
The inorganic filler is one or more of calcium carbonate, talcum powder, mica, wollastonite and the like, and the average particle size of the inorganic filler is 1-10 um.
The toughening agent is an ethylene-octene copolymer; the melt index is 0.5-20g/10min, and the test conditions are 190 ℃ and 2.16 kg.
The grafting rate of the maleic anhydride grafted polypropylene is 0.6-2.0 wt%.
The thiadiazole is 2, 5-dimercapto-1, 3, 4-thiadiazole.
The active agent is active zinc oxide, has high chemical activity and has a particle size of 10-40 nm.
60 parts of vinyl triethoxysilane is dissolved in 120 parts of absolute ethyl alcohol, 20 parts of deionized water is added after the mixture is fully stirred, concentrated hydrochloric acid is slowly dripped, the pH value of a system is adjusted to 2-3, the mixture reacts for 10 hours under the protection of nitrogen, and the solvent is removed through reduced pressure distillation at normal temperature to obtain a crude product; the crude product was recrystallized from acetone to give needle-like white crystals, which were dried at 70 ℃ for 2h to give a white powder product.
The antioxidant is at least one of amine, phosphite and hindered phenol antioxidants.
The lubricant is at least one of amide, stearic acid, fatty acid and ester lubricant.
The light stabilizer is at least one of hindered amine, benzotriazole, benzophenone and triazine benzylidene malonate light stabilizers.
The light-transmitting black toner is perylene black toner.
A preparation method of a low-shrinkage laser-weldable polypropylene modified material comprises the following steps:
weighing the materials in parts by weight, putting the materials into a high-speed stirrer for stirring and mixing, adding the mixed raw materials into a double-screw extruder, and carrying out melt blending and extrusion granulation at the temperature of 180-230 ℃ to obtain the laser-weldable modified polypropylene material. The mixing speed is 400-1000 r/min, and the mixing time is 3-7 min.
According to the preparation method, the specific formulas of comparative example 1, example 2, example 3 and example 4 are shown in the following table 1.
TABLE 1 tables of formulations of examples and comparative examples
The raw materials are put into a high-speed stirrer to be mixed, the mixing speed is 600 revolutions per minute, and the mixing time is 5 min.
And adding the mixed raw materials into a double-screw extruder, and carrying out melt blending, extrusion and granulation at the temperature of 210 ℃ to finally obtain the product.
Under the same injection molding process conditions, the products prepared in the examples 1 to 8 and the comparative examples 1 to 4 are injection molded into standard ISO mechanical sample strips for mechanical property test (test according to ISO standard method), and a sample plate with the thickness of 2mm is injection molded, and a near infrared spectrometer NIRQUEST 512 of ocean optics is used for testing the transmittance of the sample plate at the wavelength of 1100 nm; and simultaneously, molding a sample strip with the size of 150mm multiplied by 15mm multiplied by 2mm in an injection molding manner, and testing the welding force on a tensile machine after the sample strip is subjected to laser welding with the sample strip with the same size injected by the selected non-transparent bumper polypropylene material by a large-family laser welding instrument. The performance results are shown in table 2 below.
Table 2 is a table of properties of examples and comparative examples
From the results in the table above, it can be seen that the modified polypropylene materials (examples 1 to 8) prepared by the present invention have good performance in both rigidity and toughness and good light transmittance at 1100nm, and can well meet the requirements of laser welding.
As can be seen from comparative examples 2 and 3, the shrinkage of the polypropylene composite material can be obviously reduced after the thiadiazole is added, and as can be seen from examples 1 and 3, the shrinkage of the composite material can be further reduced by adding the cage-shaped octavinyl silsesquioxane on the basis of the thiadiazole addition; it can be seen from the combination of example 1, comparative example 3 and comparative example 4 that the shrinkage of thiadiazole and cage-octavinyl silsesquioxane is significantly lower than that of single component added separately, indicating that the two have synergistic effect in the system; referring to example 1, example 5 and example 6, the shrinkage of the composite material can be further reduced with the increase of the thiadiazole content; similarly, from example 2, example 7 and example 8, as the content of the cage-type octavinyl silsesquioxane is increased, the shrinkage of the composite material is continuously reduced. Finally, as can be seen from example 1, comparative example 3 and comparative example 4, the light transmittance and the welding force of the composite material added with the cage-shaped octavinyl silsesquioxane are both obviously improved, because the cage-shaped octavinyl silsesquioxane plays a role in dispersing light-transmitting black toner, the light-transmitting effect is obviously enhanced, and the welding force is improved.
The above embodiments are provided only for illustrating the present invention and not for limiting the present invention, and those skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention, and therefore all equivalent technical solutions should also fall within the scope of the present invention, and should be defined by the claims.
Claims (11)
1. A low-shrinkage laser-weldable modified polypropylene material is characterized in that: the paint comprises the following components in parts by weight:
50-90 parts of polypropylene
10-30 parts of inorganic filler
4-10 parts of toughening agent
0.2-1.5 parts of maleic anhydride grafted polypropylene
1-3 parts of thiadiazole
0.3 to 0.8 portion of active agent
0.5-2.0 parts of cage-shaped octavinyl silsesquioxane
0.3 to 0.9 portion of antioxidant
0.3 to 1.5 portions of lubricant
0.1-0.5 part of light stabilizer;
0.1-1 part of light-transmitting black powder.
2. The low shrinkage laser weldable modified polypropylene of claim 1, wherein: the polypropylene is homo-polypropylene or co-polypropylene, the melt index of the polypropylene is 1-60g/10min, and the test conditions are 230 ℃ and 2.16 kg.
3. The low shrinkage laser weldable modified polypropylene of claim 1, wherein: the inorganic filler is one or more of calcium carbonate, talcum powder, mica, wollastonite and the like, and the average particle size of the inorganic filler is 1-10 um.
4. The low shrinkage laser weldable modified polypropylene of claim 1, wherein: the toughening agent is an ethylene-octene copolymer, the melt index of the toughening agent is 0.5-20g/10min, and the test condition is 190 ℃ and 2.16 kg.
5. The low shrinkage laser weldable modified polypropylene of claim 1, wherein: the grafting rate of the maleic anhydride grafted polypropylene is 0.6-2.0 wt%.
6. The low shrinkage laser weldable modified polypropylene of claim 1, wherein: the thiadiazole is 2, 5-dimercapto-1, 3, 4-thiadiazole.
7. The low shrinkage laser weldable modified polypropylene of claim 1, wherein: the active agent is active zinc oxide.
8. The low shrinkage laser weldable modified polypropylene of claim 1, wherein: the preparation method of the cage-shaped octavinyl silsesquioxane comprises the following steps: dissolving 60 parts of vinyltriethoxysilane in 120 parts of absolute ethanol, fully stirring, adding 20 parts of deionized water, slowly dropwise adding concentrated hydrochloric acid, adjusting the pH value of the system to 2-3, reacting for 10 hours under the protection of nitrogen, and then distilling under reduced pressure at normal temperature to remove the solvent to obtain a crude product; recrystallizing the crude product in acetone to obtain needle-shaped white crystals, and drying at 70 ℃ for 2h to obtain a white powder product, namely the cage-shaped octavinyl silsesquioxane.
9. The low shrinkage laser weldable modified polypropylene of claim 1, wherein: the antioxidant is at least one of amine, phosphite and hindered phenol antioxidants;
the lubricant is at least one of amide, stearic acid, fatty acid and ester lubricant;
the light stabilizer is at least one of hindered amine, benzotriazole, benzophenone and triazine benzylidene malonate light stabilizers;
the light-transmitting black toner is perylene black toner.
10. The process for preparing a low shrinkage laser weldable modified polypropylene material according to any one of claims 1 to 9, wherein: the components in the claim 1 are weighed according to the parts by weight and then put into a high-speed stirrer for stirring and mixing, the mixed raw materials are added into a double-screw extruder for melt blending and extrusion granulation at the temperature of 190-.
11. The method of manufacturing according to claim 10, wherein: the stirring speed of the high-speed stirrer is 400-1000 revolutions per minute, and the mixing time is 3-7 min.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110358805.3A CN113150449A (en) | 2021-04-02 | 2021-04-02 | Low-shrinkage laser-weldable polypropylene modified composite material and preparation method thereof |
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| CN115678160A (en) * | 2022-10-19 | 2023-02-03 | 江苏臻远生物科技有限公司 | Composition with laser marking function |
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