A soft touch, low gloss pc / abs resin and method of making the same

Abstract

The present application relates to a kind of soft touch, low gloss PC / ABS resin, including PC resin, ABS resin, thermoplastic polyurethane elastomer, compatibilizer, heat stabilizer, other auxiliary agent.The used compatibilizer is polycarbonate type polyurethane, can significantly improve the compatibility between thermoplastic polyurethane elastomer and PC / ABS resin, the prepared PC / ABS resin composition can obtain good soft touch and low gloss effect by ordinary injection molding, can be widely used in the field such as automobile interior, household appliance shell.

Description

Technical Field

[0001] This invention belongs to the field of polymer materials, specifically relating to a soft-touch, low-gloss PC / ABS resin and its preparation method. Background Technology

[0002] PC / ABS is a thermoplastic alloy material prepared by melt blending polycarbonate (PC) and acrylonitrile-butadiene-styrene (ABS). It combines the advantages of both PC and ABS, possessing excellent heat resistance, high and low temperature toughness, dimensional stability, and processing performance. It has wide applications in many fields such as automobiles, electronics, and office equipment. Specifically in the automotive field, PC / ABS has good post-processing properties, such as painting and electroplating, and is widely used in interior and exterior automotive parts such as dashboards, center consoles, door panels, seat backs, grilles, pillars, and spoilers.

[0003] In the automotive interior trim sector, a soft-touch feel and low gloss have always been essential goals. The former, to provide a more comfortable environment for passengers, is often achieved through leather upholstery; the latter, to reduce driver fatigue, is primarily achieved through matte paint. In recent years, with fierce market competition and increased environmental awareness, paint-free materials have gradually gained favor among designers. Although PC / ABS has been used in automotive interior and exterior trim for many years, a PC / ABS material that combines both a soft-touch feel and low gloss is currently unavailable.

[0004] In order to keep up with the trend of paint-free solutions, there is an urgent need to develop a soft-touch, low-gloss PC / ABS material. Summary of the Invention

[0005] The purpose of this invention is to address the problems existing in the prior art by providing a soft-touch, low-gloss PC / ABS resin composition and its preparation method.

[0006] The objective of this invention can be achieved through the following methods:

[0007] This invention provides a soft-touch, low-gloss PC / ABS resin (composition, material) comprising the following components in parts by weight:

[0008] 50-80 parts of PC resin

[0009] 20-50 parts of ABS resin

[0010] 5-20 parts of thermoplastic polyurethane elastomer,

[0011] Compatibilizer 0.5-2 parts,

[0012] Heat stabilizer 0.5-2 parts,

[0013] Other additives: 0.5 to 2 parts.

[0014] In one embodiment of the present invention, the PC resin is bisphenol A type polycarbonate.

[0015] In one embodiment of the present invention, the ABS resin is a core-shell acrylonitrile-butadiene-styrene copolymer with a rubber content of 10-40%.

[0016] In one embodiment of the present invention, the thermoplastic polyurethane elastomer includes one or more of polyester-type polyurethane, polyether-type polyurethane, and aliphatic polyurethane. The hardness of the thermoplastic polyurethane elastomer is Shore A 60-95. The preferred amount of thermoplastic polyurethane elastomer is 5-12 parts.

[0017] In one embodiment of the present invention, the compatibilizer is a polycarbonate-type polyurethane. The purpose of adding the compatibilizer is to improve the compatibility between the thermoplastic polyurethane elastomer and the PC / ABS matrix to a certain extent, avoiding delamination defects in the product and ensuring that some thermoplastic polyurethane elastomer migrates to the product surface. If too much compatibilizer is used, the thermoplastic polyurethane elastomer will be compatible with the matrix and will rarely migrate to the product surface, failing to achieve the soft-touch effect.

[0018] Adding a significant amount of thermoplastic polyurethane elastomer to PC / ABS resin can improve its soft-touch feel while ensuring compatibility. However, this excessive addition can significantly reduce notched impact strength. This invention addresses this issue by using a smaller amount of thermoplastic polyurethane elastomer and a suitable compatibilizer (polycarbonate-based polyurethane) to ensure partial polyurethane elastomer compatibility. This prevents delamination defects in the product, improves resin flowability, better replicates mold texture, and produces a better low-gloss effect. Simultaneously, some polyurethane elastomer migrates to the product surface, resulting in a softer surface feel without affecting internal properties and ensuring high notched impact strength.

[0019] As one embodiment of the present invention, the heat stabilizer includes one or more of styrene-acrylonitrile-glycidyl methacrylate copolymer and ADR chain extender.

[0020] In one embodiment of the present invention, the other additives are one or more selected from antioxidants, lubricants, weathering agents, release agents, and colorants. Preferably, it is a combination of antioxidants, lubricants, and colorants in a mass ratio of 2:3:5.

[0021] The antioxidant includes one or more of antioxidant 168 and antioxidant 1010. Preferably, it is a combination of antioxidant 168 and antioxidant 1010 in a mass ratio of 1:1.

[0022] Lubricants include EBS lubricant.

[0023] Weather-resistant agents include one or more of benzotriazole UV absorbers and triazole UV absorbers.

[0024] Release agents include hyperbranched resins and silicone masterbatches.

[0025] Pigments include black pigments.

[0026] The present invention also provides a method (process steps and method) for preparing the soft-touch, low-gloss PC / ABS resin (composition, material), comprising the following steps:

[0027] (1) Weigh the raw materials according to the above weight percentages and premix them using a high-speed mixer;

[0028] (2) The premix obtained in step (1) is melt-extruded through a twin-screw extruder and then cooled and granulated.

[0029] The melt extrusion temperature is 120-250℃, and the screw speed is 200-500 r / min.

[0030] Compared with the prior art, the present invention has the following beneficial effects:

[0031] (1) Thermoplastic polyurethane elastomer has low hardness and good flexibility. Its melt viscosity is lower than that of PC / ABS and its fluidity is better. It is easy to migrate to the product surface during the molding process to form a skin with a soft touch. At the same time, due to its higher fluidity, it can better replicate the mold texture and produce a better low gloss effect.

[0032] (2) The epoxy functional groups in the heat stabilizer can react with terminal hydroxyl and terminal carboxyl groups to avoid excessive degradation of thermoplastic polyurethane elastomers during high-temperature processing.

[0033] (3) The prepared PC / ABS resin composition can obtain good soft touch and low gloss effect through ordinary injection molding, and can be widely used in automotive interiors, home appliance shells and other fields. Detailed Implementation

[0034] The present invention will now be described in detail with reference to specific embodiments. The following examples are implemented under the premise of the technical solution of the present invention, providing detailed implementation methods and specific operating procedures, which will help those skilled in the art to further understand the present invention. It should be noted that the scope of protection of the present invention is not limited to the following embodiments; any adjustments and improvements made under the concept of the present invention are all within the scope of protection of the present invention.

[0035] The raw materials used in the examples and comparative examples are as follows:

[0036] PC resin (bisphenol A polycarbonate): Chi Mei PC-110;

[0037] ABS resin: Shengxi'ao ABS-275, rubber content 12%;

[0038] Thermoplastic polyurethane elastomer 1 (polyether type polyurethane): Wanhua WHT-8195, hardness Shore A 95;

[0039] Thermoplastic polyurethane elastomer 2 (polyester type polyurethane): Wanhua WHT-1560, hardness Shore A 60;

[0040] Thermoplastic polyurethane elastomer 3 (aliphatic polyurethane): Wanhua WHT-A802, hardness Shore A 80;

[0041] Compatibilizer 1 (polycarbonate type polyurethane): Wanhua WHT-7180;

[0042] Compatibilizer 2 (methacrylic acid-butadiene-styrene terpolymer): Compatibilizer EM-500;

[0043] Heat stabilizer 1 (styrene-acrylonitrile-glycidyl methacrylate copolymer): Jia Yi Rong SAG-002;

[0044] Heat stabilizer 2 (chain extender): ADR-4468;

[0045] Other additives 1: Antioxidant 168 / Antioxidant 1010 / Lubricant EBS / Black powder (mass ratio 1 / 1 / 3 / 5);

[0046] Other additives 2: Antioxidant 168 / Antioxidant 1010 / Lubricant EBS / Weather resistant agent Tinuvin 328 / Mold release agent CYD-5300 / Black powder (mass ratio 1 / 1 / 3 / 5 / 3 / 5).

[0047] Examples 1-7

[0048] This embodiment provides a soft-touch, low-gloss PC / ABS resin. The mass fractions of each component are shown in Table 1, and the preparation method steps are as follows:

[0049] (1) Weigh the raw materials according to the percentages in Table 1 and premix them using a high-speed mixer;

[0050] (2) The premix obtained in step (1) is melt-extruded through a twin-screw extruder at an extrusion temperature of 120℃ / 200℃ / 220℃ / 240℃ / 250℃ / 250℃ / 250℃ / 240℃ and a screw speed of 350r / min, and then cooled and granulated.

[0051] Table 1. Specific proportions of the examples and comparative examples

[0052]

[0053] Comparative Examples 1-5

[0054] This comparative example provides a soft-touch, low-gloss PC / ABS resin. The mass fractions of each component are shown in Table 1, and its preparation method is the same as that in the examples.

[0055] Performance testing:

[0056] Melt flow rate: Tested according to ISO 1133, 260℃*5kg;

[0057] Notched impact strength: according to ISO 180, pendulum energy 4J, test temperature 23℃;

[0058] Softness level: divided into 5 levels, with level 1 representing the softest and level 5 representing the firmest. The judging panel consists of 5 people who evaluate the feel of the sample after touching it, and the average of the 5 people's evaluations is taken as the final score.

[0059] Gloss: According to ASTM D523, the test surface is K31 leather texture, and the test angle is 60°.

[0060] The test results are shown in Table 2.

[0061] Table 2 Performance of Examples and Comparative Examples

[0062]

[0063] The test results above show that the prepared PC / ABS resin composition has good soft-touch and low-gloss effects. Furthermore, the higher the amount of thermoplastic polyurethane elastomer added, the better the soft-touch effect and the lower the gloss. Examples 2 and Comparative Examples 2-4 show that although a good soft-touch and low-gloss effect was achieved without compatibilizers and heat stabilizers, or with only one of them, the notched impact strength decreased significantly, failing to meet the standard requirements of most OEMs.

[0064] The specific embodiments of the present invention have been described above. It should be understood that the present invention is not limited to the specific embodiments described above, and those skilled in the art can make various modifications or variations within the scope of the claims, which do not affect the essence of the present invention.

Claims

1. A soft-touch, low-gloss PC / ABS resin, characterized in that, The components include the following parts by mass: 60-80 parts of PC resin, 30-50 parts of ABS resin 5-10 parts of thermoplastic polyurethane elastomer, Compatibilizer 0.5-2 parts, Heat stabilizer 0.5-2 parts, Other auxiliary agents: 0.5-5 parts; The thermoplastic polyurethane elastomer includes one or more of polyester-type polyurethane, polyether-type polyurethane, and aliphatic polyurethane; The compatibilizer is a polycarbonate-type polyurethane; The heat stabilizer includes one or more of styrene-acrylonitrile-glycidyl methacrylate copolymer and ADR chain extender.

2. The PC / ABS resin according to claim 1, characterized in that, The PC resin is bisphenol A type polycarbonate.

3. The PC / ABS resin according to claim 1, characterized in that, The ABS resin is a core-shell acrylonitrile-butadiene-styrene copolymer with a rubber content of 10-40%.

4. The PC / ABS resin according to claim 1, characterized in that, The hardness of thermoplastic polyurethane elastomers is Shore A 60~90.

5. The PC / ABS resin according to claim 1, characterized in that, The other additives are one or more of antioxidants, lubricants, weathering agents, release agents, and colorants.

6. A method for preparing a soft-touch, low-gloss PC / ABS resin as described in claim 1, characterized in that, Includes the following steps: (1) Weigh the raw materials according to the mass fractions, premix them, and obtain the premix; (2) The premixed material is melt-extruded through a twin-screw extruder, cooled and granulated.

7. The preparation method according to claim 6, characterized in that, The melt extrusion temperature is 120-250℃, and the screw speed is 200-500 r / min.

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