PP (polypropylene) paint-resistant ABS (acrylonitrile-butadiene-styrene) plastic and preparation method thereof

Abstract

The invention provides PP (Propene Polymer) paint-resistant ABS (Acrylonitrile Butadiene Styrene) plastic, which is prepared from the following components in parts by weight: 60 to 70 parts of ABS, 20 to 30 parts of resin A, 15 to 25 parts of resin B, 8 to 12 parts of ABS high rubber powder, 5 to 10 parts of AS (Acrylonitrile Butadiene Styrene) and 0.5 to 1.5 parts of antioxidant, the relative molecular weight of the ABS is 5000-20000, the weight percentage content of butadiene is 55%, the weight percentage content of acrylonitrile is 10%, and the weight percentage content of styrene is 35%; the resin A is one or a mixture of PET (Polyethylene Terephthalate) or PBT (Polybutylene Terephthalate); the resin B is polyacrylonitrile (PAN); and the antioxidant is dioctadecyl pentaerythritol diphosphite ester. The ABS plastic prepared by the invention has excellent performance in the aspects of notch impact strength, vicat softening point, tensile strength, bending strength, melt index and the like, so that when PP paint is sprayed on the surface, the paint biting phenomenon is obviously reduced.

Description

Technical Field

[0001] The invention relates to the technical field of ABS plastic preparation, and in particular to ABS plastic resistant to PP paint and a preparation method thereof. Background Art

[0002] ABS is a terpolymer of acrylonitrile (AN), butadiene (BD) and styrene (St). The polyacrylonitrile (AN) part provides thermal stability and chemical resistance; the polybutadiene (BD) part provides the flexibility of the material; the polystyrene (St) part provides the processing performance and glossiness of the material. The block copolymerization of the three polymers obtains ABS with different performances for different application fields. The characteristics of ABS plastic raw materials mainly depend on the ratio of the three blocks and the distribution and dispersion of the two phases. ABS with different chemical compositions and molecular weight distributions are widely used in daily office supplies, machinery, automobiles, construction and other fields.

[0003] Paint is usually divided into three layers: primer, color paint and varnish. The primer is used to improve the adhesion of the paint to the substrate, the color paint is used to provide the color required for the product appearance, and the varnish protects the color paint and provides performance supplements in terms of weather resistance and surface hardness. By spraying paint on the surface of the product, it can play a decorative and protective role. However, due to the differences in the types of spray substrates, different plastic substrates in the plastic field require different plastic primers. In the spraying process of PP, the surface polarity of PP plastic is relatively low, resulting in poor adhesion of the primer to the substrate, requiring a primer with stronger polarity and permeability. The PP plastic primer is used to spray ABS plastic, which will cause the ABS plastic surface to bite low, and more seriously, it will cause the ABS plastic to crack. In order to improve the production efficiency of the spraying process and reduce the process cost, the present invention describes an ABS plastic resistant to PP paint and a preparation method thereof. Summary of the invention

[0004] The purpose of the present invention is to provide an ABS plastic resistant to PP paint and a preparation method thereof, by adding PET / PBT / PAN and other components to the ABS plastic component, by improving the crystallinity and polarity of the ABS plastic, etc., to reduce the paint biting phenomenon.

[0005] In order to achieve the above object, the present invention provides the following technical solutions:

[0006] An ABS plastic resistant to PP paint comprises the following components by weight: 60-70 parts of ABS, 20-30 parts of resin A, 15-25 parts of resin B, 8-12 parts of ABS high-rubber powder, 5-10 parts of AS, and 0.5-1.5 parts of antioxidant.

[0007] Furthermore, the relative molecular weight of the ABS is 5000-20000, wherein the weight percentage of butadiene is 55%, the weight percentage of acrylonitrile is 10%, and the weight percentage of styrene is 35%.

[0008] Furthermore, the resin A is one or a mixture of PET or PBT.

[0009] Furthermore, the resin B is polyacrylonitrile PAN.

[0010] Furthermore, the antioxidant is dioctadecyl pentaerythritol diphosphite.

[0011] Furthermore, it also includes 1-3 parts of sodium benzoate and 2-4 parts of 2,5-isooctyl furandicarboxylate.

[0012] Furthermore, it also includes 2-5 parts of maleimide and 3-7 parts of polyvinyl alcohol; the relative molecular weight of the polyvinyl alcohol is 8500, the degree of polymerization is 180, and the alcoholysis degree of the polyvinyl alcohol is 100%.

[0013] The preparation method of the above-mentioned ABS plastic resistant to PP paint comprises the following steps:

[0014] S1: Prepare the materials according to the proportions, mix and stir until uniform and set aside;

[0015] S2: Add the mixture into the main feeding bin of the twin-screw extruder, add it into the main barrel of the extruder through the feeding screw, and melt extrude it to obtain the ABS plastic.

[0016] Furthermore, the screw diameter of the twin-screw extruder is 35 mm, the aspect ratio L / D=36, the feeding screw speed is 25 r / min, and the twin-screw speed is 60-100 r / min.

[0017] Furthermore, the temperature of the main barrel is controlled in five sections; from the feed port to the die outlet, they are 200°C, 230°C, 250°C, 255°C, and 240°C respectively.

[0018] Compared with the prior art, the advantages and beneficial effects of the present invention are:

[0019] On the one hand, the present invention uses PET or PBT as resin A, and acts synergistically with sodium benzoate, 2,5-isooctyl furandicarboxylate, etc. to reduce the surface free energy barrier of nucleation, improve the crystallinity of the material, and enhance the compactness of the material; on the other hand, polyacrylonitrile PAN is used as resin B, and acts together with maleimide and polyvinyl alcohol to improve the polarity of the material, form a dense electron cloud on the surface of the material, and form a protective layer; under the action of the above two, by optimizing material ratios, process parameters, etc., the surface performance of ABS is significantly improved, and the paint biting phenomenon is significantly reduced. DETAILED DESCRIPTION

[0020] The technical solutions in the embodiments of the present invention are described clearly and completely below. 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.

[0021] The raw materials used in the present invention are as follows:

[0022] ABS comes from Wuhan Jiyesheng Chemical Co., Ltd., item number 4756; ABS high-glue powder comes from Kumho Petrochemical in South Korea, item number HR181; PET comes from Shanghai Huihang New Materials Co., Ltd., item number FR533NH; PBT comes from Longchi New Materials (Dongguan) Co., Ltd., item number 725; PAN comes from Shanghai Jieshikai Biotechnology Co., Ltd., item number KA735106; dioctadecyl pentaerythritol diphosphite comes from Suzhou Senfida Chemical Co., Ltd., item number 2887; 2,5-isooctyl furandicarboxylate comes from Shanghai Yuanye Biotechnology Co., Ltd., item number S72156; maleimide comes from Shanghai Yuanye Biotechnology Co., Ltd., item number S48137; polyvinyl alcohol comes from Shanghai Yuanye Biotechnology Co., Ltd., item number S30196.

[0023] Example 1

[0024] This embodiment provides a method for preparing ABS plastic resistant to PP paint, comprising the following steps:

[0025] S1: Take 1200g ABS, 400g PET, 300g polyacrylonitrile PAN, 160g ABS high-rubber powder, 20g sodium benzoate, 40g 2,5-furandicarboxylic acid isooctyl ester, 40g maleimide, 60g polyvinyl alcohol, 100g AS, 10g antioxidant dioctadecyl pentaerythritol diphosphite, stir at a temperature of 140°C and a speed of 500r / min for 30min to obtain a mixture for standby use; wherein the relative molecular weight of the ABS is 20000 (butadiene 55%-acrylonitrile 10%-styrene 35%); the relative molecular weight of the polyvinyl alcohol is 8500, the degree of polymerization is 180, and the alcoholysis degree of the polyvinyl alcohol is 100%;

[0026] S2: Add the above mixture into the main feeding bin of the twin-screw extruder, control the screw diameter of the twin-screw extruder to 30 mm, the aspect ratio L / D=32, the feeding screw speed to 20 r / min, the twin screw speed to 60 r / min, and add it to the main barrel of the extruder through the feeding screw for melt extrusion. The temperature of the main barrel is controlled in five sections: 190°C, 215°C, 235°C, 240°C, and 230°C from the feeding port to the die outlet, respectively, to obtain the ABS plastic.

[0027] Example 2

[0028] This embodiment provides a method for preparing ABS plastic resistant to PP paint, comprising the following steps:

[0029] S1: 1400g ABS, 600g PET, 500g polyacrylonitrile PAN, 240g ABS high-rubber powder, 60g sodium benzoate, 80g 2,5-furandicarboxylic acid isooctyl ester, 100g maleimide, 140g polyvinyl alcohol, 200g AS, 30g antioxidant dioctadecyl pentaerythritol diphosphite and 160g polycarbonate are mixed, stirred at a temperature of 160°C and a speed of 500r / min for 50min to obtain a mixture for standby use; wherein the relative molecular weight of the ABS is 5000 (butadiene 55%-acrylonitrile 10%-styrene 35%); the relative molecular weight of the polyvinyl alcohol is 8500, the degree of polymerization is 180, and the alcoholysis degree of the polyvinyl alcohol is 100%;

[0030] S2: Add the above mixture into the main feeding bin of the twin-screw extruder, control the screw diameter of the twin-screw extruder to 40 mm, the aspect ratio L / D=45, the feeding screw speed to 35 r / min, the twin screw speed to 100 r / min, and add it to the main barrel of the extruder through the feeding screw for melt extrusion. The temperature of the main barrel is controlled in five sections: 210°C, 240°C, 255°C, 265°C, and 245°C from the feeding port to the die outlet, respectively, to obtain the ABS plastic.

[0031] Example 3

[0032] This embodiment provides a method for preparing ABS plastic resistant to PP paint, comprising the following steps:

[0033] S1: 1300g ABS, 500g PBT, 440g polyacrylonitrile PAN, 200g ABS high-rubber powder, 40g sodium benzoate, 60g 2,5-furandicarboxylic acid isooctyl ester, 60g maleimide, 100g polyvinyl alcohol, 140g AS, 24g antioxidant dioctadecyl pentaerythritol diphosphite and 120g polycarbonate are mixed, stirred at a temperature of 155°C and a speed of 500r / min for 40min to obtain a mixture for standby use; wherein the relative molecular weight of the ABS is 16000 (butadiene 55%-acrylonitrile 10%-styrene 35%); the relative molecular weight of the polyvinyl alcohol is 8500, the degree of polymerization is 180, and the alcoholysis degree of the polyvinyl alcohol is 100%;

[0034] S2: Add the above mixture into the main feeding bin of the twin-screw extruder, control the screw diameter of the twin-screw extruder to 35 mm, the aspect ratio L / D=36, the feeding screw speed to 25 r / min, the twin screw speed to 80 r / min, add the mixture into the main barrel of the extruder through the feeding screw for melt extrusion, and control the temperature of the main barrel in five sections: 200°C, 230°C, 250°C, 255°C, and 240°C from the feeding port to the die outlet, respectively, to obtain the ABS plastic.

[0035] Comparative Example 1

[0036] The difference between this comparative example and Example 1 is that PET is missing in step S1, that is, polystyrene microspheres are not added for modification, and the other steps are the same.

[0037] Comparative Example 2

[0038] The difference between this comparative example and Example 1 is that polyacrylonitrile PAN is missing in step S1, and the other steps are the same.

[0039] Comparative Example 3

[0040] The difference between this comparative example and Example 1 is that step S1 lacks sodium benzoate and 2,5-isooctyl furandicarboxylate, and the other steps are the same.

[0041] Comparative Example 4

[0042] The difference between this comparative example and Example 1 is that maleimide and polyvinyl alcohol are missing in step S1, and the other steps are the same.

[0043] Comparative Example 5

[0044] The difference between this comparative example and Example 1 is that the temperature in step S2 is controlled in three stages, namely 190° C., 235° C., and 230° C. from the feed port to the die outlet, and the other steps are the same.

[0045] Performance Test:

[0046] Notched impact: According to ASTM D-256, the sample size is 50mm long × 10mm wide × 3.2mm thick, the notch depth is 2.54mm, and the impact load is 5.5J; tensile strength: According to ASTM D-638, the sample size is 50mm long × 10mm wide × 3.2mm thick, and the tensile rate is 55mm / min; flexural strength: According to ASTM D-790, the sample size is 50mm long × 10mm wide × 3.2mm thick, the stroke rate is set to 2mm / min, and the span is 52cm, and its flexural strength is measured; Vicat softening point is tested according to GBT 1633-2000; Melt index is tested according to ASTM D-1238. The results are shown in the following table:

[0047] Table 1 Performance test results

[0048]

[0049] From the above performance test results, it can be seen that Examples 1-3 adopt the technical features of the present invention and have excellent performance in notched impact strength, Vicat softening point, tensile strength, bending strength, melt index, etc.; in particular, the comprehensive performance of Example 3 is the most outstanding. However, since Comparative Examples 1-5 do not adopt the necessary technical solutions, their corresponding performance tests are significantly worse than those of the Examples. The above experimental results further prove the importance of the technical solutions defined in the present invention for its technical effects.

[0050] The above is a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. An ABS plastic resistant to PP paint, characterized in that: The composition comprises the following components in parts by weight: 60-70 parts of ABS, 20-30 parts of resin A, 15-25 parts of resin B, 8-12 parts of ABS high-rubber powder, 5-10 parts of AS, 0.5-1.5 parts of antioxidant and 3-8 parts of polycarbonate.

2. The ABS plastic resistant to PP paint according to claim 1, characterized in that: The relative molecular weight of the ABS is 5000-20000, wherein the weight percentage of butadiene is 55%, the weight percentage of acrylonitrile is 10%, and the weight percentage of styrene is 35%.

3. The ABS plastic resistant to PP paint according to claim 1, characterized in that: The resin A is one or a mixture of PET or PBT.

4. The ABS plastic resistant to PP paint according to claim 1, characterized in that: The resin B is polyacrylonitrile PAN.

5. The ABS plastic resistant to PP paint according to claim 1, characterized in that: The antioxidant is dioctadecyl pentaerythritol diphosphite.

6. The ABS plastic resistant to PP paint according to claim 1, characterized in that: Also included are 1-3 parts of sodium benzoate and 2-4 parts of isooctyl 2,5-furandicarboxylate.

7. The ABS plastic resistant to PP paint according to claim 1, characterized in that: It also includes 2-5 parts of maleimide and 3-7 parts of polyvinyl alcohol; the relative molecular weight of the polyvinyl alcohol is 8500, the degree of polymerization is 180, and the alcoholysis degree of the polyvinyl alcohol is 100%.

8. A method for preparing ABS plastic resistant to PP paint, characterized in that: The steps include: S1: Prepare the materials according to the proportions, mix and stir until uniform and set aside; S2: Add the mixture into the main feeding bin of the twin-screw extruder, add it into the main barrel of the extruder through the feeding screw, and melt extrude it to obtain the ABS plastic.

9. The method for preparing ABS plastic resistant to PP paint according to claim 8, characterized in that: The screw diameter of the twin-screw extruder is 35 mm, the aspect ratio L / D=36, the feeding screw speed is 25 r / min, and the twin-screw speed is 60-100 r / min.

10. The method for preparing ABS plastic resistant to PP paint according to claim 8, characterized in that: The main barrel is divided into five sections for temperature control; from the feed port to the die outlet, they are 200°C, 230°C, 250°C, 255°C, and 240°C respectively.

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