Carbon-reducing PCR (Polymerase Chain Reaction) polypropylene material for refrigerator

Abstract

The invention relates to a preparation method of a carbon-reducing PCR (Polymerase Chain Reaction) polypropylene material for refrigerators, which belongs to the technical field of polymer composite materials and comprises the following raw materials in parts by weight: 15-100 parts of PCR polypropylene material, 20-45 parts of polypropylene resin, 0-4 parts of polyethylene resin, 0-40 parts of talcum powder, 0-30 parts of calcium carbonate, 0-15 parts of glass fiber, 0-5 parts of maleic anhydride grafted polypropylene, 0-22 parts of brominated flame retardant and 0-6 parts of antimony powder flame retardant. The halogen-free flame retardant is prepared from the following components in parts by weight: 0 to 30 parts of halogen-free flame retardant, 0 to 0.2 part of anti-dripping agent, 0.3 to 1.0 part of composite antioxidant and 0.2 to 0.3 part of lubricating dispersant According to the carbon-reducing PCR polypropylene material for the refrigerator, the polypropylene material regenerated after consumption is applied to the refrigerator material, especially the preparation of an electric control box, an embedded box and a water pan, so that the long-acting anti-oxidation performance of the material is improved while the basic mechanical property of the material is maintained.

Description

Technical Field

[0001] The invention belongs to the technical field of polymer composite materials, and in particular relates to a carbon-reduced PCR polypropylene material for refrigerators. Background Art

[0002] Polypropylene is one of the most commonly used materials in daily life. It has low density, is colorless and non-toxic, has excellent processing performance, and is very resistant to chemicals. It is currently commonly used in various home appliance materials. The main polymer materials in refrigerator components include high-impact polystyrene, polypropylene, and acrylonitrile-butadiene-styrene copolymer.

[0003] In recent years, in response to the need for carbon reduction and emission reduction and in response to the carbon tax gradually levied on home appliances in Europe, it has been a major trend in the past decade to prepare some parts of home appliance materials into PCR parts. However, for refrigerators, most of the components need to contact food, especially the inner tank, drawers, bottle frames, etc., so there are relatively strict food-grade restrictions on materials, and conventional PCR materials cannot be used for carbon reduction. The use of PCR polypropylene materials to reduce carbon in refrigerators is currently mainly focused on several non-appearance and non-functional parts such as the electric control box, water tray, fixing card, and embedded box.

[0004] Since PCR materials have gone through a round of market applications, the molecular weight is relatively low, and there are problems with molecular chain breakage, degradation and relatively poor long-term aging tolerance. In order to make PCR-PP better meet the performance requirements of the parts, attention should be paid to improving its antioxidant ability and metal passivation performance during the modification of the material to avoid premature catalysis. For example, Chinese patent CN 118406322 A improves the heat resistance and metal decomposition resistance of the material by optimizing antioxidant additives and adding hydrazide compounds, and improves the long-term heat resistance of polypropylene materials. For example, Chinese patent CN 118006037 A improves the performance of PCR-PP materials by optimizing POE to high-impact transparent polypropylene. However, for refrigerator materials, different parts need to face different challenges. For the electric control box, it needs to face the presence of metal ions in the PCR material, which reduces its flame retardant performance. However, parts such as embedded boxes and water trays will face problems such as differences in shrinkage rate and initial materials after a round of degradation of PCR-PP materials. At present, there is still little research on carbon reduction and emission reduction on polymer materials for refrigerators. Summary of the invention

[0005] The object of the present invention is to provide a carbon-reduced PCR polypropylene material for refrigerators, so as to solve the problem of poor performance of electric control boxes, embedded boxes and water receiving trays prepared by PCR-PP materials in the prior art.

[0006] The purpose of the present invention can be achieved through the following technical solutions:

[0007] A carbon-reduced PCR polypropylene material for refrigerators, comprising the following raw materials in parts by weight:

[0008]

[0009] Furthermore, the PCR polypropylene material is a PCR polypropylene material that is recycled from polypropylene washing machine barrel materials, battery shell materials, strapping materials, film materials, etc., and its melt index at 230°C / 2.16Kg is distributed within 3 to 30g / 10min.

[0010] Furthermore, the polypropylene resin is at least one of homopolypropylene and copolymer polypropylene.

[0011] Furthermore, the polyethylene resin is a linear low-density polyethylene resin, and its melt index at 190° C. / 2.16 kg is 3 to 10 g / 10 min.

[0012] Furthermore, the glass fiber is short-cut alkali-free glass fiber: the single fiber diameter is 3.0-4.5 μm, and the length is 10-13 mm.

[0013] Furthermore, the brominated flame retardant is decabromodiphenylethane.

[0014] Furthermore, the antimony powder flame retardant is antimony trioxide, and its purity needs to reach more than 99.8%.

[0015] Furthermore, the halogen-free flame retardant is piperazine pyrophosphate.

[0016] Furthermore, the anti-dripping agent is polytetrafluoroethylene.

[0017] Furthermore, the composite antioxidant is at least two of a primary antioxidant, a secondary antioxidant and a long-acting antioxidant.

[0018] Furthermore, the main antioxidant is at least one of antioxidant 1010, antioxidant 330, antioxidant 3114 and antioxidant 1790.

[0019] Furthermore, the auxiliary antioxidant is a phosphite antioxidant, preferably antioxidant 168.

[0020] Furthermore, the long-acting antioxidant is at least one of the antioxidant DSTP and the antioxidant 412S.

[0021] Furthermore, the lubricating dispersant is at least one of fatty acid and ester lubricants, fatty acid amide lubricants, and metal soap lubricants, preferably at least one of calcium stearate, zinc stearate, lubricant TAF, and EBS (ethylene bis stearamide).

[0022] The preparation process of the above-mentioned carbon-reduced PCR polypropylene material for refrigerators comprises the following steps:

[0023] Weigh the raw materials according to the formula ratio, mix the raw materials except glass fiber evenly to obtain a mixture, and then add the mixture to the main feeding port of the twin-screw extruder. If glass fiber reinforcement is required, add the glass fiber to the side feeding port, and carry out melt extrusion, drawing, cooling granulation and drying.

[0024] Furthermore, the extrusion temperature is 180-230° C., and the screw speed is 350-450 rpm.

[0025] Beneficial effects of the present invention:

[0026] The carbon-reduced PCR polypropylene material for refrigerators of the present invention applies post-consumer recycled polypropylene materials to refrigerator materials, especially to the preparation of electric control boxes, embedded boxes and water trays. While maintaining the basic mechanical properties of the material, its long-term antioxidant performance is improved and different effects are given to it, which can better reduce resource waste and respond to the requirements of carbon reduction and emission reduction. DETAILED DESCRIPTION

[0027] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0028] A carbon-reduced PCR polypropylene material for refrigerators, comprising the following raw materials in parts by weight:

[0029]

[0030] The PCR polypropylene material is a PCR polypropylene material obtained by recycling polypropylene washing machine barrel materials, battery shell materials, packaging tape materials, film materials and the like, and its melt index at 230° C. / 2.16 kg is distributed within 3 to 30 g / 10 min.

[0031] The polypropylene resin is at least one of homopolypropylene and copolymer polypropylene.

[0032] The polyethylene resin is a linear low-density polyethylene resin, and its melt index at 190° C. / 2.16 kg is 3-10 g / 10 min.

[0033] The glass fiber is short-cut alkali-free glass fiber: the diameter of the single fiber is 3.0-4.5 μm, and the length is 10-13 mm.

[0034] The brominated flame retardant is decabromodiphenylethane.

[0035] The antimony powder flame retardant is antimony trioxide, and its purity needs to reach more than 99.8%.

[0036] The halogen-free flame retardant is piperazine pyrophosphate.

[0037] The anti-drip agent is polytetrafluoroethylene.

[0038] The composite antioxidant is at least two of a main antioxidant, a secondary antioxidant and a long-acting antioxidant.

[0039] The primary antioxidant is at least one of antioxidant 1010 , antioxidant 330 , antioxidant 3114 and antioxidant 1790 .

[0040] The auxiliary antioxidant is a phosphite antioxidant, preferably antioxidant 168.

[0041] The long-acting antioxidant is at least one of the antioxidant DSTP and the antioxidant 412S.

[0042] The lubricating dispersant is at least one of fatty acid and ester lubricants, fatty acid amide lubricants, and metal soap lubricants, preferably at least one of calcium stearate, zinc stearate, lubricant TAF, and EBS (ethylene bis stearic acid amide).

[0043] The preparation process of the above-mentioned carbon-reduced PCR polypropylene material for refrigerators comprises the following steps:

[0044] Weigh the raw materials according to the formula ratio, mix the raw materials except glass fiber evenly to obtain a mixture, and then add the mixture to the main feeding port of the twin-screw extruder. If glass fiber reinforcement is required, add the glass fiber to the side feeding port, and carry out melt extrusion, drawing, cooling granulation and drying.

[0045] The extrusion temperature is 180-230°C, and the screw speed is 350-450rpm.

[0046] Example 1

[0047] A reduced carbon PCR polypropylene material for refrigerators (refrigerator water tray) is prepared by weighing 75 parts of PCR washing machine barrel material, 20 parts of copolymerized polypropylene resin, 5 parts of talcum powder, 10100.15 parts of antioxidant, 1680.15 parts of antioxidant, and 0.2 parts of calcium stearate.

[0048] The preparation method of the above-mentioned carbon-reduced PCR polypropylene material for refrigerator is as follows:

[0049] The above raw materials are mixed evenly to obtain a mixture, and then the mixture is added to the main feeding port of a twin-screw extruder for melt extrusion, strip drawing, cooling granulation, and drying. The extrusion temperature is 180-230°C and the screw speed is 400rpm.

[0050] Example 2

[0051] A reduced-carbon PCR polypropylene material for refrigerators (refrigerator water tray), compared with Example 1, the only difference is the formula composition. The formula of the refrigerator water tray in this embodiment is as follows: 35 parts of PCR film material, 15 parts of PCR washing machine barrel material, 20 parts of copolymerized polypropylene resin, 30 parts of calcium carbonate, 0.15 parts of antioxidant 1010, 0.15 parts of antioxidant 168, 0.4 parts of antioxidant DSTP, and 0.2 parts of zinc stearate are weighed by weight.

[0052] Example 3

[0053] A carbon-reduced PCR polypropylene material for refrigerators (refrigerator electronic control box), compared with Example 1, the only difference is the formula composition. The formula scheme of the refrigerator electronic control box in this embodiment is as follows: 30 parts of PCR battery shell material, 22 parts of copolymerized polypropylene resin, 22 parts of bromine flame retardant, 6 parts of antimony powder flame retardant, 20 parts of talcum powder, 0.1 part of anti-dripping agent, 0.15 parts of antioxidant 1010, 0.15 parts of antioxidant 168, and 0.2 parts of calcium stearate are weighed by weight.

[0054] Example 4

[0055] A carbon-reduced PCR polypropylene material for refrigerators (refrigerator electronic control box). Compared with Example 3, the only difference is the formula composition. The formula scheme of the refrigerator electronic control box in this embodiment is as follows: 30 parts of PCR washing machine barrel material, 40 parts of copolymerized polypropylene resin, 30 parts of halogen-free flame retardant, 0.2 parts of anti-dripping agent, 0.3 parts of antioxidant 3114, 0.3 parts of antioxidant 168, and 0.3 parts of calcium stearate are weighed by weight.

[0056] Example 5

[0057] A reduced-carbon PCR polypropylene material for refrigerators (refrigerator fixing card), compared with Example 1, the only difference is the different formula composition. The formula scheme of the refrigerator fixing card in this embodiment is as follows: 80 parts of PCR washing machine barrel material, 20 parts of copolymerized polypropylene resin, 10100.2 parts of antioxidant, 1680.3 parts of antioxidant, and 0.3 parts of calcium stearate are weighed by weight.

[0058] Example 6

[0059] A reduced-carbon PCR polypropylene material for refrigerators (refrigerator pre-embedded box), compared with Example 1, the only difference is the different formula composition. The formula scheme of the refrigerator pre-embedded box in this embodiment is as follows: 20 parts of PCR washing machine barrel material, 20 parts of homopolymer polypropylene resin, 25 parts of copolymer polypropylene resin, 15 parts of glass fiber, 5 parts of maleic anhydride grafted polypropylene, 15 parts of talcum powder, 3300.2 parts of antioxidant, 1680.3 parts of antioxidant, and 0.3 parts of lubricant TAF are weighed by weight.

[0060] Example 7

[0061] A reduced-carbon PCR polypropylene material for refrigerators (refrigerator pre-embedded box), compared with Example 1, the only difference is the different formula composition. The formula scheme of the refrigerator pre-embedded box in this embodiment is as follows: 15 parts of PCR washing machine barrel material, 45 parts of copolymerized polypropylene resin, 40 parts of talcum powder, 0.2 parts of antioxidant 17900, 0.3 parts of antioxidant 1680, 0.4 parts of antioxidant 412S, and 0.3 parts of lubricant TAS are weighed by weight.

[0062] Example 8

[0063] A reduced-carbon PCR polypropylene material for refrigerators (refrigerator strapping tape), compared with Example 1, the only difference is the different formula composition. The formula scheme of the refrigerator strapping tape in this embodiment is: The formula scheme of the refrigerator strapping tape: weigh 70 parts of PCR strapping tape material, 26 parts of homopolymer polypropylene resin, 4 parts of polyethylene resin, 10100.2 parts of antioxidant, 1680.3 parts of antioxidant, and 0.3 parts of lubricant EBS in parts by weight.

[0064] Comparative Example 1

[0065] A reduced-carbon PCR polypropylene material (refrigerator water tray) for refrigerators, compared with Example 2, the only difference is that the polypropylene resin in Example 2 is removed. The formula of the refrigerator water tray in this embodiment is as follows: 49 parts of PCR film material, 21 parts of PCR washing machine barrel material, 30 parts of calcium carbonate, 0.15 parts of antioxidant 1010, 0.15 parts of antioxidant 168, 0.4 parts of antioxidant DSTP, and 0.2 parts of zinc stearate are weighed by weight.

[0066] The carbon-reduced PCR polypropylene materials for refrigerators obtained in Examples 1 to 8 and Comparative Example 1 were tested, and the mechanical properties were analyzed according to the test standards of GB / T 1033, GB / T 1040, GB / T 9341, and GB / T 1843, and the oxidation induction period was analyzed according to the test method of GB / T 19466. The results are shown in Table 1:

[0067] Table 1

[0068]

[0069]

[0070] It can be seen from the data recorded in Table 1 that in Example 2 and Comparative Example 1, if a large amount of PCR polypropylene material is used to replace polypropylene to prepare the raw materials, since the PCR polypropylene raw material itself has undergone a cycle of use, there are a large number of chain breaks and free radicals in the molecular chain. Even if a sufficient amount of antioxidant is added, the effective ingredients of the antioxidant will be quickly consumed, and the polypropylene molecular chain will continue to be broken, thereby reducing the oxidation induction period of the material, causing the life cycle of the product to be rapidly reduced; and the overall mechanical properties are relatively poor, which is reduced by about 5% to 30% compared with Example 2.

[0071] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0072] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A carbon-reduced PCR polypropylene material for refrigerators, characterized in that: The invention comprises the following raw materials in parts by weight:

2. A reduced carbon PCR polypropylene material for refrigerators according to claim 1, characterized in that: The PCR polypropylene material is a PCR polypropylene material obtained by recycling polypropylene washing machine barrel materials, battery shell materials, packaging tape materials, film materials and the like, and its melt index at 230° C. / 2.16 kg is distributed within 3 to 30 g / 10 min.

3. A reduced carbon PCR polypropylene material for refrigerators according to claim 1, characterized in that: The polypropylene resin is at least one of homopolypropylene and copolymer polypropylene.

4. The reduced carbon PCR polypropylene material for refrigerators according to claim 1, characterized in that: The polyethylene resin is a linear low-density polyethylene resin, and its melt index at 190° C. / 2.16 kg is 3-10 g / 10 min.

5. The reduced carbon PCR polypropylene material for refrigerators according to claim 1, characterized in that: The glass fiber is short-cut alkali-free glass fiber with a single fiber diameter of 3.0 to 4.5 μm and a length of 10 to 13 mm.

6. The reduced carbon PCR polypropylene material for refrigerators according to claim 1, characterized in that: The brominated flame retardant is decabromodiphenylethane.

7. The reduced carbon PCR polypropylene material for refrigerators according to claim 1, characterized in that: The antimony powder flame retardant is antimony trioxide, and its purity needs to reach more than 99.8%.

8. The reduced carbon PCR polypropylene material for refrigerators according to claim 1, characterized in that: The halogen-free flame retardant is piperazine pyrophosphate, and the anti-dripping agent is polytetrafluoroethylene.

9. The reduced carbon PCR polypropylene material for refrigerators according to claim 1, characterized in that: The composite antioxidant is at least two of a main antioxidant, a secondary antioxidant and a long-acting antioxidant, the main antioxidant is at least one of antioxidant 1010, antioxidant 330, antioxidant 3114 and antioxidant 1790, the secondary antioxidant is a phosphite antioxidant, and the long-acting antioxidant is at least one of antioxidant DSTP and antioxidant 412S.

10. The reduced carbon PCR polypropylene material for refrigerators according to claim 1, characterized in that: The lubricating dispersant is at least one of calcium stearate, zinc stearate, lubricant TAF and ethylenebisstearic acid amide.

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