CN114854135B - Modified polypropylene material and preparation method and application thereof - Google Patents
Modified polypropylene material and preparation method and application thereof Download PDFInfo
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Abstract
The invention discloses a modified polypropylene material, a preparation method and application thereof, and belongs to the technical field of polymer modified materials. The modified polypropylene material comprises modified heat-resistant polypropylene and heat-resistant UV-resistant polypropylene master batches, and the product has excellent shock resistance through the optimization of matrix resin and nucleating agent in the modified heat-resistant polypropylene; the weather resistance of the product is greatly improved through the synergistic effect between the specific light stabilizer and the antioxidant in the components; the heat-resistant and UV-resistant polypropylene is prepared into a master batch form, so that the effect of a nucleating agent is exerted to a greater extent, and the modified polypropylene has better heat distortion temperature, rigidity and impact property; the product of the invention has excellent heat resistance, the heat distortion temperature is more than or equal to 130 ℃, the product can be sterilized at high temperature under the condition of 100 ℃ without deformation, and the product has great application prospect in the preparation of dinner plates and lunch boxes.
Description
Technical Field
The invention relates to the technical field of polymer modified materials, in particular to a modified polypropylene material and a preparation method and application thereof.
Background
Polypropylene is one of five general resins, has the excellent characteristics of light weight, easy processing, chemical corrosion resistance and the like, and is widely applied to the industrial fields of chemical industry, electric appliances, packaging and the like. Because the polypropylene has lower material cost, the polypropylene can replace other materials to be applied to dinner plates in mess halls, lunch boxes, upper covers of lunch boxes and the like; however, polypropylene has poor weather resistance and is not Ultraviolet (UV) resistant, and in general, the thermal deformation temperature of polypropylene is 95-105 ℃, and the polypropylene is easy to deform under the condition of high-temperature sterilization, so that the application of the polypropylene material in some heat-resistant and UV-resistant fields is affected.
Therefore, developing a polypropylene material which can be applied to food contact, and has good heat resistance, high impact strength, good UV resistance and good dispersibility is a hot spot in current research.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a modified polypropylene material with good heat resistance, high impact strength, good UV resistance and good dispersibility, and a preparation method and application thereof.
In order to achieve the above purpose, the technical scheme adopted by the invention is as follows: the modified polypropylene material comprises the following components in parts by weight: 94-98 parts of modified heat-resistant polypropylene, 2-6 parts of heat-resistant UV-resistant polypropylene master batch; the modified heat-resistant polypropylene comprises an alpha nucleating agent and a beta nucleating agent; the heat-resistant UV-resistant polypropylene master batch comprises a light stabilizer and an antioxidant; the light stabilizer is a mixture of a UV absorber and a hindered amine light stabilizer, and the antioxidant is a mixture of phosphite antioxidants and hindered phenol antioxidants.
According to the invention, the alpha nucleating agent is added into the modified heat-resistant polypropylene, so that the transparency, the surface glossiness, the rigidity and other thermodynamic properties of the polypropylene can be obviously improved, and the alpha nucleating agent has better compatibility with the polypropylene; by adding the beta nucleating agent, the beta crystal form crystallization of the polypropylene can be induced, so that the polypropylene can obtain a high content of beta crystal form, thereby endowing the polypropylene product with good impact resistance, heat resistance and high void ratio, and under the condition that the base material has higher heat distortion temperature and impact property, the heat distortion temperature of the polypropylene is improved to a greater extent, and the impact reduction degree of the product can be reduced by adding the beta nucleating agent.
According to the invention, the light stabilizer and the antioxidant are added into the heat-resistant and UV-resistant polypropylene master batch, and the weather resistance of the product can be improved to a great extent through the synergistic effect between the light stabilizer and the antioxidant, so that the product has economical efficiency and the market competitiveness of the product is improved.
Preferably, the modified polypropylene comprises the following components in parts by weight: 96 parts of modified heat-resistant polypropylene and 4 parts of heat-resistant UV-resistant polypropylene master batch; the inventor researches out that the modified polypropylene prepared by the weight parts has better heat resistance, impact strength and UV resistance.
Preferably, the heat-resistant and UV-resistant polypropylene master batch comprises the following components in parts by weight: 70-90 parts of copolymerized polypropylene, 4-8 parts of light stabilizer, 6-10 parts of antioxidant and 1-5 parts of lubricant.
More preferably, the heat-resistant and UV-resistant polypropylene masterbatch comprises the following components in parts by weight: 82 parts of copolymerized polypropylene, 6 parts of light stabilizer, 8 parts of antioxidant and 4 parts of lubricant.
Most preferably, the light stabilizer is at least one of UV absorber UV531, UV absorber UV5411, light stabilizer UV622, light stabilizer 5050H, light stabilizer 944, and light stabilizer 945.
As a preferred embodiment of the invention, the light stabilizer is a mixture of UV absorber UV531, light stabilizer 5050H and light stabilizer 944, and the weather resistance of polypropylene can be improved by compounding the three light stabilizers; because the product injection molded by the modified polypropylene material is applied to the field requiring UV disinfection, UV531 can absorb 240-340nm ultraviolet light, is an efficient anti-aging auxiliary agent with excellent performance, has great protection effect on the polymer, is beneficial to reducing color and luster, and delays yellowing and retards loss of physical properties; light stabilizer 5050H and light stabilizer 944 are both high molecular weight hindered amine light stabilizers, so that the long-term weather resistance is good, the product is protected from being discolored, the high molecular weight and migration, and the light stabilizer belongs to food grade and is safer; the light stabilizer 5050H has good compatibility with polypropylene, is resistant to extraction, and can be repeatedly washed; can reduce the performance and the degree of discoloration of the product after high-temperature aging.
As a more preferred embodiment of the present invention, the light stabilizer is UV absorber UV531, light stabilizer 5050H and light stabilizer 944 in a weight ratio of UV absorber UV531: light stabilizer 5050H: light stabilizer 944 = 2:1:1 a formulated mixture; experiments show that the light stabilizer has better effect of improving the weather resistance of polypropylene at the weight ratio.
More preferably, the antioxidant is at least one of antioxidant 168, antioxidant 1010, antioxidant 1076, antioxidant 1098, antioxidant 1790, antioxidant 618 and antioxidant 627.
Most preferably, the antioxidant is antioxidant 1010, antioxidant 1098 and antioxidant 627, the above 3 antioxidants are added in the heat-resistant and UV-resistant polypropylene master batch, the phosphite antioxidants 627 are good in compatibility with polypropylene, high in heat-resistant durability, good in yellowing resistance and anti-hydrolysis resistance, the antioxidants 627 are matched with the hindered phenol antioxidants 1010 and the antioxidants 1098, the antioxidants 1010 are good in economy and excellent in long-term aging resistance, the antioxidants 1098 are high-temperature resistant, and the long-term aging resistance and the color of the heat-resistant and UV-resistant polypropylene master batch can be better protected by compounding the above 3 antioxidants.
As a preferred embodiment of the invention, the antioxidant is antioxidant 1010, antioxidant 1098 and antioxidant 627, and the weight ratio of the antioxidant 1010 is: antioxidant 1098: antioxidant 627=2: 2:1 a formulated mixture; the three antioxidants have the best protection on the long-term aging performance and the color of the heat-resistant and UV-resistant polypropylene master batch under the compound proportion.
More preferably, the lubricant is a composite lubricant of PE wax and calcium stearate.
Most preferably, the weight ratio of PE wax to calcium stearate is PE wax: calcium stearate = 4:1.
preferably, the preparation method of the heat-resistant and UV-resistant polypropylene master batch comprises the following steps: mixing the raw materials, mixing in a double-screw extruder, extruding a bracing piece, cooling, granulating, and uniformly mixing to obtain the heat-resistant UV-resistant polypropylene master batch.
More preferably, the extrusion temperature of the heat-resistant UV-resistant polypropylene masterbatch is 100-175 ℃.
More preferably, the twin screw extruder has an aspect ratio 44:1, the diameter of the screw is 65-75mm.
Preferably, the heat-resistant and UV-resistant polypropylene master batch comprises the following components in parts by weight: 97-99 parts of polypropylene copolymer, 0.1-1 part of nucleating agent, 0.1-1 part of antioxidant and 0.1-1 part of lubricant.
More preferably, the heat-resistant and UV-resistant polypropylene masterbatch comprises the following components in parts by weight: 99 parts of copolymerized polypropylene, 0.4 part of nucleating agent, 0.3 part of antioxidant and 0.3 part of lubricant.
It should be noted that the heat distortion temperature of the polypropylene copolymer is more than or equal to 110 ℃, and the notched Izod impact strength is more than 100J/m, so that the polypropylene copolymer B300MN or the polypropylene copolymer PCC0742 is selected.
More preferably, the nucleating agent of the present invention is an alpha nucleating agent which is di (p-chloro substituted benzylidene) sorbitol and a beta nucleating agent which is N, N' -dicyclohexyl terephthalamide. Most preferably, the weight ratio of the alpha nucleating agent to the beta nucleating agent is 1:1 the inventors have experimentally found that the two nucleating agents give the article the best impact properties at this weight ratio.
More preferably, the modified heat-resistant polypropylene further comprises 0.3 part of an antioxidant and 0.3 part of a lubricant; by adding an antioxidant into the modified heat-resistant polypropylene, the base material can be protected during extrusion granulation, and degradation is reduced; by adding a lubricant, the dispersibility of the nucleating agent can be promoted.
Most preferably, the antioxidant is antioxidant B215 and the lubricant is paraffin wax.
Preferably, the preparation method of the modified heat-resistant polypropylene comprises the following steps: mixing the raw materials, mixing, granulating in a double-screw extruder, and uniformly mixing after air drying to obtain the modified heat-resistant polypropylene.
More preferably, the extrusion temperature of the modified heat-resistant polypropylene is 205-225 ℃, and at the extrusion temperature, the polypropylene can be guaranteed to be sufficiently melted in a double-screw extruder, so that the crystallization of the polypropylene is promoted, the nucleating agent can better play a role, the crystal grains are refined, the crystallinity is improved, and the physical and mechanical properties such as transparency, surface gloss, tensile strength, rigidity, heat distortion temperature and the like of the polypropylene are comprehensively or partially improved.
More preferably, the twin screw extruder has an aspect ratio of 44:1, the diameter of the screw is 65-75mm.
The invention also provides a preparation method of the modified polypropylene material, which comprises the following steps: and mixing the modified heat-resistant polypropylene with the heat-resistant UV-resistant polypropylene master batch to obtain the modified polypropylene.
The invention also provides application of the modified polypropylene material in preparation of dinner plates and lunch boxes.
The invention has the beneficial effects that: the modified polypropylene material comprises modified heat-resistant polypropylene and heat-resistant UV-resistant polypropylene master batches, and the product is not easy to crack after multiple collision and drop by optimizing matrix resin and nucleating agent in the modified heat-resistant polypropylene, so that the modified heat-resistant polypropylene material has excellent shock resistance; through the synergistic effect between the specific light stabilizer and the antioxidant in the components, the weather resistance of the product is greatly improved, the product is baked for 500 hours at 130 ℃, the color difference is only 1.0, the UV irradiation is carried out for 500 hours, and the color difference is only 2.5; the heat-resistant and UV-resistant polypropylene is prepared into a master batch form, so that the comprehensive effect of the alpha nucleating agent and the beta nucleating agent can be exerted to a greater extent, and the heat distortion temperature, the rigidity and the impact property of the modified polypropylene are better without being influenced by high-weight antioxidants and light stabilizers; the modified heat-resistant polypropylene and the heat-resistant UV-resistant polypropylene master batch are mixed for 30min and then discharged and packaged, so that the product performance is considered, the method is economical and practical, and the surface of the injection molded product has no flow marks. The product of the invention has excellent heat resistance, the heat distortion temperature is more than or equal to 130 ℃, the product can be sterilized at high temperature under the condition of 100 ℃ and is not deformed, and the product has great application prospect in the preparation of dinner plates and lunch boxes.
Detailed Description
For a better description of the objects, technical solutions and advantages of the present invention, the present invention will be further described with reference to the following specific examples.
The raw materials used in the examples and comparative examples of the present invention were all purchased from the market, wherein the copolymer polypropylene B300MN (heat distortion temperature: 115 ℃, impact strength: 160J/m, melt index: 30g/0 min) was purchased from Indian Chengcheng; the polypropylene copolymer PCC0742 (heat distortion temperature: 112 ℃, impact strength: 150J/m, melt index: 7g/10 min) was purchased from Braskem; the polypropylene copolymer EP300M (heat distortion temperature: 90 ℃, impact strength: 100J/M, melt index: 9g/10 min) was purchased from Zhonghai Shell; the copolymer polypropylene K7726H (heat distortion temperature: 95 ℃, impact strength: 120J/m, melt index: 26g/0 min) was purchased from Yanshan petrochemical industry.
Example 1
In one embodiment of the modified polypropylene material, the formula of the heat-resistant modified polypropylene is shown in table 1, and the formula of the heat-resistant UV-resistant polypropylene master batch is shown in table 2.
In example 1, the heat-resistant modified polypropylene was prepared by the following method: ingredients were formulated as in table 1 (parts by weight) at aspect ratio 44:1, in a double-screw extruder with the screw diameter of 65-75mm, mixing and granulating at the temperature of 205-225 ℃, granulating by an underwater granulator, air-drying, mixing uniformly, and packaging to obtain the heat-resistant modified polypropylene.
In example 1, the preparation method of the heat-resistant and UV-resistant polypropylene master batch comprises the following steps: ingredients were formulated as in table 1 (parts by weight) at aspect ratio 44:1, in a double-screw extruder with the screw diameter of 65-75mm, mixing and granulating at the temperature of 100-175 ℃, cooling an extrusion bracing piece with water, cooling by a fan, granulating again, mixing uniformly, and packaging to obtain the heat-resistant UV-resistant polypropylene master batch.
In example 1, the preparation method of the modified polypropylene comprises the following steps: and (3) putting 96 parts by weight of modified heat-resistant polypropylene and 4 parts by weight of heat-resistant UV-resistant polypropylene master batch into a 1000-5000L spiral feeding type mixing barrel, mixing for 30min, discharging and packaging to obtain the modified polypropylene.
Example 2
This embodiment differs from embodiment 1 only in that: the preparation method of the modified polypropylene comprises the following steps: and (3) putting 94 parts by weight of modified heat-resistant polypropylene and 6 parts by weight of heat-resistant UV-resistant polypropylene master batch into a 1000-5000L spiral feeding type mixing barrel, mixing for 30min, discharging and packaging to obtain the modified polypropylene.
The formulation of the heat-resistant modified polypropylene and the formulation of the heat-resistant UV-resistant polypropylene master batch in this example are the same as those in example 1, and the preparation method of the heat-resistant modified polypropylene and the preparation method of the heat-resistant UV-resistant polypropylene master batch are the same as those in example 1.
Example 3
This embodiment differs from embodiment 1 only in that: the preparation method of the modified polypropylene comprises the following steps: and (3) adding 98 parts by weight of modified heat-resistant polypropylene and 2 parts by weight of heat-resistant UV-resistant polypropylene master batch into a 1000-5000L spiral feeding type mixing barrel, mixing for 30min, discharging and packaging to obtain the modified polypropylene.
The formulation of the heat-resistant modified polypropylene and the formulation of the heat-resistant UV-resistant polypropylene master batch in this example are the same as those in example 1, and the preparation method of the heat-resistant modified polypropylene and the preparation method of the heat-resistant UV-resistant polypropylene master batch are the same as those in example 1.
Example 4
This embodiment differs from embodiment 1 only in that: the types of the heat-resistant modified polypropylene and the heat-resistant UV-resistant polypropylene in the master batches are different; the formula of the heat-resistant modified polypropylene is shown in table 1, and the formula of the heat-resistant UV-resistant polypropylene master batch is shown in table 2.
The preparation method of the heat-resistant modified polypropylene, the preparation method of the heat-resistant UV-resistant polypropylene master batch and the preparation method of the modified polypropylene are the same as those of the embodiment 1.
TABLE 1
TABLE 2
Comparative example 1
This comparative example differs from example 1 only in that: the modified heat-resistant polypropylene is not added with a beta nucleating agent; the formulation of the heat-resistant modified polypropylene is shown in Table 3, and the formulation of the heat-resistant UV-resistant polypropylene master batch is shown in Table 4.
The preparation method of the heat-resistant modified polypropylene, the preparation method of the heat-resistant UV-resistant polypropylene master batch and the preparation method of the modified polypropylene in this comparative example are the same as in example 1.
Comparative example 2
This comparative example differs from example 1 only in that: alpha nucleating agent is not added into the modified heat-resistant polypropylene; the formulation of the heat-resistant modified polypropylene is shown in Table 3, and the formulation of the heat-resistant UV-resistant polypropylene master batch is shown in Table 4.
The preparation method of the heat-resistant modified polypropylene, the preparation method of the heat-resistant UV-resistant polypropylene master batch and the preparation method of the modified polypropylene in this comparative example are the same as in example 1.
Comparative example 3
This comparative example differs from example 1 only in that: only adding copolymer polypropylene into the modified heat-resistant polypropylene; the formulation of the heat-resistant modified polypropylene is shown in Table 3, and the formulation of the heat-resistant UV-resistant polypropylene master batch is shown in Table 4.
The preparation method of the heat-resistant UV-resistant polypropylene master batch in the comparative example is the same as that in example 1, and the preparation method of the modified polypropylene comprises the following steps: and (3) putting 96 parts by weight of the copolymerized polypropylene PCC0742 and 4 parts by weight of the heat-resistant UV-resistant polypropylene master batch into a 1000-5000L spiral feeding type mixing barrel, mixing for 30min, discharging and packaging to obtain the modified polypropylene.
Comparative example 4
This comparative example differs from example 1 only in that: only a UV absorber UV531 is added to the heat-resistant and UV-resistant polypropylene master batch, an antioxidant is an antioxidant B215, the formula of the heat-resistant modified polypropylene is shown in table 3, and the formula of the heat-resistant and UV-resistant polypropylene master batch is shown in table 4.
The preparation method of the heat-resistant modified polypropylene, the preparation method of the heat-resistant UV-resistant polypropylene master batch and the preparation method of the modified polypropylene in this comparative example are the same as in example 1.
Comparative example 5
This comparative example differs from example 1 only in that: the antioxidant in the heat-resistant and UV-resistant polypropylene master batch is an antioxidant B215, the formula of the heat-resistant modified polypropylene is shown in Table 3, and the formula of the heat-resistant and UV-resistant polypropylene master batch is shown in Table 4.
The preparation method of the heat-resistant modified polypropylene, the preparation method of the heat-resistant UV-resistant polypropylene master batch and the preparation method of the modified polypropylene in this comparative example are the same as in example 1.
Comparative example 6
This comparative example differs from example 1 only in that: only the UV absorber UV531 is added into the heat-resistant and UV-resistant polypropylene master batch, the formula of the heat-resistant modified polypropylene is shown in Table 3, and the formula of the heat-resistant and UV-resistant polypropylene master batch is shown in Table 4.
The preparation method of the heat-resistant modified polypropylene, the preparation method of the heat-resistant UV-resistant polypropylene master batch and the preparation method of the modified polypropylene in this comparative example are the same as in example 1.
Comparative example 7
The difference between this comparative example and example 1 is that: the modified polypropylene comprises the following components in parts by weight: the polypropylene wax comprises, by weight, 95.04 parts of a polypropylene PCC0742, 3.28 parts of a polypropylene B300MN, 0.192 part of di (p-chloro substituted benzylidene) sorbitol, 0.192 part of N, N' -dicyclohexyl terephthalamide, 0.12 part of UV531, 006 parts of a light stabilizer 5050H, 0.06 part of a light stabilizer 944, 0.128 part of an antioxidant 1010, 0.128 part of an antioxidant 627.064 part of an antioxidant, 0.356 part of PE wax, 0.032 part of calcium stearate and 0.288 part of an antioxidant B215.
The preparation method of the modified polypropylene comprises the following steps: the formulation was formulated to have a length to diameter ratio of 44:1, in a double-screw extruder with the screw diameter of 65-75mm, mixing and granulating at the temperature of 100-225 ℃, cooling an extrusion bracing piece with water, cooling by a fan, granulating again, mixing in a 1000-5000L spiral feeding type mixing barrel for 30min, discharging and packaging to obtain the modified polypropylene.
TABLE 3 Table 3
TABLE 4 Table 4
Effect example
And (3) testing material performance: and (5) performing injection molding by adopting a CG110E horizontal type injection machine to obtain a standard sample. The molding process conditions are as follows: injection temperature (feed inlet) 185/190/195/195 ℃ (nozzle); the injection pressure is 50MPa; dwell time 8s; cooling time is 10s; the performance test criteria are as follows: impact strength: testing was performed according to ASTM D-256 (23 ℃); heat distortion temperature: testing (0.45 MPa, heating rate 120 ℃/h) according to ASTM D-648 standard; color difference meter: middle NH310, light source D65; UV aging instrument: Q-LAB QUV/SPRAY aging acceleration tester, light source UV-340, according to ASTM G154-2016 standard Cycle1, the product is 12mm x 1.5mm small square plate; high temperature aging: baking is carried out by using an oven, and the temperature is set to be 130 ℃.
The test properties of the modified polypropylenes described in examples 1 to 4 and comparative examples 1 to 5 are shown in Table 5 below:
TABLE 5
As can be seen from Table 5, the modified polypropylene materials prepared in examples 1-3 have good heat distortion temperature, impact strength and UV resistance; among them, the modified polypropylene material in example 1 has the best heat distortion temperature, impact strength and UV resistance; whereas example 4 uses a copolymerized polypropylene resin having a low heat distortion temperature: the modified polypropylene EP300M and the modified polypropylene K7726H have the color change condition inferior to that of the modified polypropylene material in the example 1 after being baked at high temperature, and the modified polypropylene in the example 4 is not suitable for being sterilized for a long time under the high temperature condition, and the product is easy to change color and deform; the impact strength of the modified polypropylene is not kept in the original substrate data due to the fact that the beta nucleating agent is not added in the comparative example 1, the discoloration situation after high-temperature baking is also worse than that of the example 1, the thermal deformation temperature of the modified polypropylene is lower than that of the original substrate due to the fact that the alpha nucleating agent is not added in the comparative example 2, and the impact strength and the thermal deformation temperature are not improved relative to the original substrate due to the fact that the 2 nucleating agents are not added in the comparative example 3; comparative example 4 since only UV absorber UV531 was added to the light stabilizer and phosphite esters and hindered phenol antioxidants were not added, the discoloration of the product was severe after UV irradiation/high temperature baking at 130 ℃; comparative example 5 because phosphite esters and hindered phenol antioxidants are not added, the color change of the product is serious after the product is baked at a high temperature of 130 ℃; comparative example 6 since only UV absorber UV531 was added to the light stabilizer, the discoloration of the product was severe after UV irradiation; thus, the articles of comparative examples 4-6 were not able to withstand high temperature UV sterilization for long periods of time; comparative example 7 does not make the heat-resistant UV-resistant polypropylene into a masterbatch form, but directly pumps the components of the modified polypropylene, resulting in impact strength and heat distortion temperature far lower than those of the polypropylene base material, and although the light stabilizer, antioxidant and lubricant are added in excess, the nucleating agent does not exert the effect of grain refinement, and does not improve the performance of the product.
In conclusion, the selection of the polypropylene base material, the processing mode of the modified polypropylene, and the reasonable collocation of the light stabilizer and the antioxidant can influence the performance of the heat-resistant UV-resistant modified polypropylene material.
Finally, it should be noted that the above embodiments are only for illustrating the technical solution of the present invention and not for limiting the scope of the present invention, and although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that the technical solution of the present invention may be modified or substituted equally without departing from the spirit and scope of the technical solution of the present invention.
Claims (6)
1. The modified polypropylene material is characterized by comprising the following components in parts by weight: 94-98 parts of modified heat-resistant polypropylene, 2-6 parts of heat-resistant UV-resistant polypropylene master batch; the modified heat-resistant polypropylene comprises the following components in parts by weight: the polypropylene copolymer comprises, by weight, 0742 97-99 parts of a polypropylene copolymer PCC, 0.1-1 part of a nucleating agent, 0.1-1 part of an antioxidant and 0.1-1 part of a lubricant, wherein the nucleating agent comprises an alpha nucleating agent and a beta nucleating agent, and the weight ratio of the alpha nucleating agent to the beta nucleating agent is 1:1, a step of; the heat-resistant and UV-resistant polypropylene master batch comprises the following components in parts by weight: 70-90 parts of copolymerized polypropylene B300MN, 4-8 parts of light stabilizer, 6-10 parts of antioxidant and 1-5 parts of lubricant, wherein the light stabilizer is UV absorber UV531, light stabilizer 5050H and light stabilizer 944 in weight ratio is UV absorber UV531: light stabilizer 5050H: light stabilizer 944 = 2:1:1 a formulated mixture; the antioxidant is an antioxidant 1010, an antioxidant 1098 and an antioxidant 627, and the weight ratio of the antioxidant 1010 is as follows: antioxidant 1098: antioxidant 627=2: 2:1 a formulated mixture;
the preparation method of the modified polypropylene material comprises the following steps:
s1, mixing and granulating the polypropylene copolymer PCC0742, a nucleating agent, an antioxidant and a lubricant in a double screw extruder, granulating, air-drying, uniformly mixing and packaging to obtain the modified heat-resistant polypropylene;
s2, mixing and granulating the copolymer polypropylene B300MN, the light stabilizer, the antioxidant and the lubricant in a double-screw extruder, cooling and granulating after extrusion, and finally uniformly mixing and packaging to obtain the heat-resistant UV-resistant polypropylene master batch;
and S3, mixing the modified heat-resistant polypropylene obtained in the step S1 with the heat-resistant and UV-resistant polypropylene master batch obtained in the step S2 to obtain the modified polypropylene.
2. The modified polypropylene material according to claim 1, wherein the modified polypropylene material comprises the following components in parts by weight: 96 parts of modified heat-resistant polypropylene and 4 parts of heat-resistant UV-resistant polypropylene master batch.
3. The modified polypropylene material according to claim 1, wherein the heat-resistant UV-resistant polypropylene masterbatch comprises the following components in parts by weight: 82 parts of copolymerized polypropylene B300MN, 6 parts of light stabilizer, 8 parts of antioxidant and 4 parts of lubricant.
4. The modified polypropylene material of claim 1, wherein the modified heat resistant polypropylene comprises the following components in parts by weight: 0742 99 parts of copolymerized polypropylene PCC, 0.4 part of nucleating agent, 0.3 part of antioxidant and 0.3 part of lubricant.
5. The modified polypropylene material of claim 1, wherein the α -nucleating agent is bis (p-chloro substituted benzylidene) sorbitol and the β -nucleating agent is N, N' -dicyclohexyl terephthalamide.
6. Use of the modified polypropylene material according to any one of claims 1-5 for the preparation of dinner plates and lunch boxes.
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| EP3674363A1 (en) * | 2018-12-29 | 2020-07-01 | ITP (Heyuan) Luggage Co., Ltd | Polypropylene modified material, preparation method and luggage made thereof |
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