Interior PP (polypropylene) material containing PCR (polymerase chain reaction) material and preparation method of interior PP material

Abstract

The invention discloses an interior PP material containing a PCR material and a preparation method of the interior PP material, and the interior PP material comprises the following components in parts by weight: 20-50 parts of PCR-PP resin; 20 to 40 parts of PP new material resin; 3-8 parts of a toughening agent; 2 to 6 parts of compatilizer; 0.5 to 1.2 parts of a chain extender; 10 to 50 parts of glass fiber; 0.2 to 0.6 part of an antioxidant; and 0.2 to 0.8 part of a lubricant. Part of mineral impurities and carbonate fillers in the recycled material can be removed through pretreatment of PCR-PP with weak acid, and the purity and performance of the material are improved. Due to the addition of the chain extender, through the reaction of active groups, the overall binding force of the PCR-PP and the glass fibers is improved, and the degradation condition of a PCR material is improved. The PCR-PP is wide in source, and after the PCR-PP is recycled, environmental pollution can be avoided, and resource waste and carbon emission are reduced.

Description

Technical Field

[0001] The invention relates to the technical field of automobile interior decoration, and in particular to an interior decoration PP material containing PCR material and a preparation method thereof. Background Art

[0002] New plastic particles are produced by collecting discarded plastics from the recycling stream and then sorting, cleaning and granulating them in a mechanical recycling system. The new plastic particles have the same structure as the plastic before recycling, but the overall performance will be reduced. At the same time, due to some of its own shortcomings (such as strong odor and inferior performance to new petroleum-based materials), its application in the automotive industry, especially in the field of automotive interiors, is limited. How to use PCR materials in automotive interior materials with huge consumption has become a common problem faced by automotive interior material manufacturers and vehicle manufacturers.

[0003] In recent years, the use of plastics in my country has shown a rapid growth. Polypropylene, one of the most used plastics, has a large number of recyclable resources, such as washing machine drums, automobile interior and exterior trims, etc. At present, a large number of PCR-PP materials are only recycled as low-end waste plastics, with low technical content, resulting in unstable product quality. They are mostly used in some tool shells, etc., with low added value. In recent years, the development of the domestic automobile industry has also had a great demand for PP materials, but given the high requirements of the automobile industry for environmental protection indicators such as the odor of the material (many exterior trims currently have similar indicators), its application is also limited.

[0004] In the prior art, ordinary resin raw materials are usually used, and water-containing additives are added during the production and processing. The water evaporates to take away VOC and other odor-causing substances, and post-processing steps such as baking are added before packaging. PCR-PP materials can basically only meet the ordinary mechanical properties and appearance requirements of injection molding. Adding water-containing additives can easily cause appearance defects such as "silver wire" and "splash" on the material. Increasing vacuum devolatilization and adding baking steps will bring additional energy consumption and costs. Summary of the invention

[0005] The technical problem to be solved by the present invention is to provide an interior PP material containing PCR material and a preparation method thereof, so as to improve material performance and reduce environmental pollution.

[0006] The technical problem to be solved by the present invention is achieved through the following technical solutions:

[0007] An interior PP material containing PCR material, comprising the following components in parts by weight:

[0008] PCR-PP resin, 20-50 copies;

[0009] PP new material resin, 20-40 parts;

[0010] Toughening agent, 3 to 8 parts;

[0011] Compatibilizer, 2 to 6 parts;

[0012] Chain extender, 0.5-1.2 parts;

[0013] Glass fiber, 10-50 parts;

[0014] Antioxidant, 0.2-0.6 parts;

[0015] Lubricant, 0.2-0.8 parts.

[0016] Preferably, in the above technical solution, the PCR-PP resin has a melt index of 2-60 g / 10 min at 230°C / 2.16 kg.

[0017] The PCR-PP resin needs to be pretreated as follows:

[0018] (1) Crush the PCR-PP resin and sieve it to ensure that the D50 particle size is no greater than 1 mm;

[0019] (2) Soaking the screened PCR-PP resin in an acid solution for 1 to 2 hours, with the acid solution temperature at 40 to 50° C.;

[0020] (3) Pour off the acid solution and rinse with deionized water until the pH is neutral;

[0021] (4) Soak in hydrogen peroxide for 2 to 4 hours;

[0022] (5) Filter, wash with deionized water until neutral, and dry to a moisture content of less than 0.3%.

[0023] Preferably, in the above technical solution, the acidic solution is at least one of succinic acid or fruit acid; the concentration of the acidic solution is 3-6%; and the concentration of the hydrogen peroxide is 0.5%-1%.

[0024] Preferably, in the above technical solution, the PP new material resin has a melt index of 10-50 g / min at 230°C / 2.16 kg.

[0025] Preferably, in the above technical solution,

[0026] The toughening agent is a polyolefin elastomer;

[0027] The compatibilizer is a copolymer or graft of polypropylene, polyethylene and an active group, and the active group of the compatibilizer is at least one of maleic anhydride and glycidyl methacrylate;

[0028] The chain extender is a mixture of 2,2'-bis(2-thiazoline), starch grafted acrylate, and polyphenol type glycidyl ether epoxy resin; the glass fiber is alkali-free glass fiber;

[0029] The antioxidant is compounded by hindered phenol antioxidant and phosphate antioxidant;

[0030] The lubricant is at least one of stearic acid amide, mesic acid amide, stearic acid and stearate, and polymethylsiloxane.

[0031] Preferably, in the above technical solution,

[0032] The polyolefin elastomer is POE or EPDM;

[0033] The molar ratio of the 2,2'-bis(2-thiazoline), starch grafted acrylate, and polyphenol type glycidyl ether epoxy resin is (10-30):(30-50):(20-40);

[0034] The weight ratio of the hindered phenol antioxidant to the phosphate antioxidant is (0.4-1.6):(1.6-0.4).

[0035] Preferably, in the above technical solution,

[0036] The hindered phenol antioxidant is selected from one or more of the following: tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl)]propionate isooctyl ester, 4,4'-thiobis(6-tert-butyl-3-methylphenol), N,N'-1,6-hexylene-bis-[3,5-di-tert-butyl-4-hydroxyphenylpropionamide];

[0037] The phosphate antioxidant is selected from one or more of the following: 4,4-butylenebis-(3-methyl-6-tert-butylphenyl)-tetra(tridecyl) diphosphite, (2,4-di-tert-butyl)phenyl phosphite, at least one of di(2,4-di-tert-butyl)pentaerythritol phosphate, and poly(dipropylene glycol)phenyl phosphite.

[0038] A method for preparing an interior PP material containing PCR material comprises the following steps:

[0039] (1) Weigh PCR-PP resin, PP new material resin, toughening agent, compatibilizer, chain extender, antioxidant, and lubricant according to proportion;

[0040] (2) stirring the various raw materials in step (1) uniformly;

[0041] (3) using a high-speed mixer as the stirring device in step (2) and mixing for 3 to 5 minutes for later use;

[0042] (4) The premix obtained in step (3) is fed into a twin-screw extruder through a main feed port, and glass fiber is added from a side feed port. After melting, extrusion, water cooling, air drying, and pelletizing, an interior PP material containing PCR material is obtained.

[0043] Preferably, in the above technical scheme, the length-to-diameter ratio (L / D) of the twin-screw extruder in the step (4) is 30-40, and there is a side feeding device; the temperature is 100-250°C, and the screw speed is 250-400rpm; the twin-screw extruder can be divided into 8 temperature control zones from the feeding port to the outlet, and the specific temperature of each temperature control zone is 100-120°C, 210-220°C, 210-220°C, 210-220°C, 210-220°C, 210-220°C, 210-220°C, 210-220°C, 210-220°C, and the screw speed is 280-400rpm.

[0044] A heat-resistant and low-odor automobile interior component, wherein the automobile interior component comprises an interior PP material.

[0045] The above technical solution of the present invention has the following beneficial effects:

[0046] The beneficial effects of this application include:

[0047] (1) Pretreatment of PCR-PP with weak acid can remove some mineral impurities and carbonate fillers in the recycled material, thereby improving the purity and performance of the material.

[0048] (2) The addition of large chain extenders improves the overall bonding strength between PCR-PP and glass fiber through the reaction of active groups, thereby improving the degradation of PCR materials.

[0049] (3) PCR-PP has a wide range of sources and can be recycled and reused to avoid environmental pollution, reduce resource waste and carbon emissions. DETAILED DESCRIPTION

[0050] Various exemplary embodiments of the present invention will now be described in detail. It should be noted that the relative arrangement of components and steps, numerical expressions and numerical values ​​set forth in these embodiments do not limit the scope of the present invention unless otherwise specifically stated.

[0051] The PCR-PP used in the following embodiments is a commercially available product, the PP new material resin is a product of Yanshan Petrochemical; the toughening agent is a product of LG of South Korea; the compatibilizer is a product of Shanghai Jiayirong; the chain extender, antioxidant and lubricant are commercially available products.

[0052] In addition, the experimental methods used in the following examples are all conventional methods unless otherwise specified, the materials and reagents used are all commercially available unless otherwise specified, and the equipment used in the experiments are all well known to those skilled in the art unless otherwise specified.

[0053] Example

[0054] According to the formula in Table 1, the raw materials of Examples 1 to 4 and Comparative Examples 1 to 4 were prepared respectively, and the preparation was carried out according to the above steps. The specific temperatures of each temperature control zone of the twin-screw extruder were 100°C, 210°C, 220°C, 220°C, 220°C, 215°C, 215°C, and 220°C, and the screw speed was 350rpm. The extruded material strips were cooled in a water tank and then pelletized.

[0055] Table 1

[0056] Example 1 Example 2 Example 3 Example 4 Comparative Example 1 Comparative Example 2 Comparative Example 3 Comparative Example 4 PCR-PP (pre-treatment) 20 40 45 50 / / 45 50 PCR-PP (untreated) / / / / 30 40 / / PP K7726 40 30 25 20 40 30 25 20 Compatibilizer 2 3 5 6 2 3 5 6 POE LC170 8 7 5 3 8 7 5 3 Chain Extender 0.5 0.7 0.9 1.2 0.5 0.7 / / Fiberglass 20 25 25 20 20 25 25 20 Antioxidants 0.6 0.5 0.4 0.2 0.6 0.5 0.4 0.3 Lubricants 0.2 0.4 0.6 0.8 0.2 0.4 0.6 0.8

[0057] Table 2

[0058] Example 5 Example 6 Example 7 Comparative Example 5 Comparative Example 6 Comparative Example 7 PCR-PP (pre-treatment) 35 40 20 / / / PP K7726 40 20 20 80 60 40 Compatibilizer 2 3 5 2 3 5 POE LC170 8 7 5 8 7 5 Chain Extender 0.5 0.7 0.9 / / / Fiberglass 10 30 50 10 30 50 Antioxidants 0.6 0.5 0.4 0.6 0.5 0.4 Lubricants 0.2 0.4 0.6 0.2 0.4 0.6

[0059] The products of the above embodiments and comparative examples were dried in a blast oven at 80°C for 4 hours and then injection molded into standard specimens using a plastic injection molding machine. The injection molded specimens were placed at a relative humidity of 50% and 23°C for at least 24 hours before performance testing.

[0060] Physical performance test conditions: Product performance test methods are as follows:

[0061] The tensile strength of the material is tested based on GB / T 1040.2 standard, the Charpy impact strength of the material is tested based on GB / T 1043.1 standard, the flexural strength and flexural modulus of the material are tested based on GB / T 9341 standard, the odor grade of the material is tested based on PV3900 standard, and the TVOC of the material is tested based on VDA277.

[0062] Table 3 Performance tests of Examples 1 to 4 and Comparative Examples 1 to 4

[0063]

[0064] Note: The lower the odor level, the less odor there is.

[0065] Table 4 Performance test of Examples 5 to 7 and Comparative Examples 5 to 7

[0066]

[0067] From the above examples and comparative examples, the mechanical properties, TVOC and odor of examples 1-4 are significantly better than those of comparative examples 1-4, among which, comparative example 1-2 uses PCR-PP without pretreatment, and its mechanical properties and odor level are significantly lower than those of examples 1-2. This shows that the performance of PCR-PP treated with chain extender and PP plus glass fiber material is significantly better than that of untreated and unadded chain extender, and TVOC and odor are better.

[0068] From Examples 5-7 and Comparative Examples 5-7, it can be seen that the material using PCR-PP can fully achieve the performance of the modified material using new PP material.

[0069] Although the present invention has been disclosed as above by the embodiments, it is not intended to limit the present invention. Any person skilled in the art may make various choices and modifications without departing from the spirit and scope of the present invention. Therefore, the protection scope of the present invention is limited by the claims and their equivalents.

Claims

1. An interior PP material containing PCR material, characterized in that: It includes the following components by weight: PCR-PP resin, 20-50 copies; PP new material resin, 20-40 parts; Toughening agent, 3 to 8 parts; Compatibilizer, 2 to 6 parts; Chain extender, 0.5-1.2 parts; Glass fiber, 10-50 parts; Antioxidant, 0.2-0.6 parts; Lubricant, 0.2-0.8 parts.

2. The interior PP material containing PCR material according to claim 1, characterized in that: The PCR-PP resin has a melt index of 2-60 g / 10 min at 230° C. / 2.16 kg; The PCR-PP resin needs to be pretreated as follows: (1) Crush the PCR-PP resin and sieve it to ensure that the D50 particle size is no greater than 1 mm; (2) Soaking the screened PCR-PP resin in an acid solution for 1 to 2 hours, with the acid solution temperature at 40 to 50° C.; (3) Pour off the acid solution and rinse with deionized water until the pH is neutral; (4) Soak in hydrogen peroxide for 2 to 4 hours; (5) Filter, wash with deionized water until neutral, and dry to a moisture content of less than 0.3%.

3. The interior PP material containing PCR material according to claim 2, characterized in that: The acidic solution is at least one of succinic acid and fruit acid; the concentration of the acidic solution is 3-6%; the concentration of the hydrogen peroxide is 0.5%-1%.

4. The interior PP material containing PCR material according to claim 1, characterized in that: The PP new material resin has a melt index of 10-50 g / min at 230° C. / 2.16 kg.

5. The interior PP material containing PCR material according to claim 1, characterized in that: The toughening agent is a polyolefin elastomer; The compatibilizer is a copolymer or graft of polypropylene, polyethylene and an active group, and the active group of the compatibilizer is at least one of maleic anhydride and glycidyl methacrylate; The chain extender is a mixture of 2,2'-bis(2-thiazoline), starch grafted acrylate, and polyphenol type glycidyl ether epoxy resin; the glass fiber is alkali-free glass fiber; The antioxidant is compounded by hindered phenol antioxidant and phosphate antioxidant; The lubricant is at least one of stearic acid amide, mesic acid amide, stearic acid and stearate, and polymethylsiloxane.

6. The interior PP material containing PCR material according to claim 5, characterized in that: The polyolefin elastomer is POE or EPDM; The molar ratio of the 2,2'-bis(2-thiazoline), starch grafted acrylate, and polyphenol type glycidyl ether epoxy resin is (10-30):(30-50):(20-40); The weight ratio of the hindered phenol antioxidant to the phosphate antioxidant is (0.4-1.6):(1.6-0.4).

7. The interior PP material containing PCR material according to claim 6, characterized in that: The hindered phenol antioxidant is selected from one or more of the following: tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl)]propionate isooctyl ester, 4,4'-thiobis(6-tert-butyl-3-methylphenol), N,N'-1,6-hexylene-bis-[3,5-di-tert-butyl-4-hydroxyphenylpropionamide]; The phosphate antioxidant is selected from one or more of the following: 4,4-butylenebis-(3-methyl-6-tert-butylphenyl)-tetra(tridecyl) diphosphite, (2,4-di-tert-butyl)phenyl phosphite, at least one of di(2,4-di-tert-butyl)pentaerythritol phosphate, and poly(dipropylene glycol)phenyl phosphite.

8. A method for preparing an interior PP material containing PCR material according to any one of claims 1 to 7, characterized in that: The following steps are involved: (1) Weigh PCR-PP resin, PP new material resin, toughening agent, compatibilizer, chain extender, antioxidant, and lubricant according to proportion; (2) stirring the various raw materials in step (1) uniformly; (3) using a high-speed mixer as the stirring device in step (2) and mixing for 3 to 5 minutes for later use; (4) The premix obtained in step (3) is fed into a twin-screw extruder through a main feed port, and glass fiber is added from a side feed port. After melting, extrusion, water cooling, air drying, and pelletizing, an interior PP material containing PCR material is obtained.

9. The preparation method according to claim 8, characterized in that: In the step (4), the length-to-diameter ratio (L / D) of the twin-screw extruder is 30-40, and a side feeding device is provided; the temperature is 100-250°C, and the screw speed is 250-400rpm; the twin-screw extruder can be divided into 8 temperature control zones from the feeding port to the outlet, and the specific temperature of each temperature control zone is 100-120°C, 210-220°C, 210-220°C, 210-220°C, 210-220°C, 210-220°C, 210-220°C, 210-220°C, 210-220°C, and the screw speed is 280-400rpm.

10. A heat-resistant and low-odor automotive interior component, characterized in that: The automobile interior component comprises the interior PP material according to any one of claims 1-7.

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