Easy-to-clean soft-touch PC / ABS material and preparation method thereof

Abstract

The invention provides an easy-to-clean soft-touch PC / ABS (Polycarbonate / Acrylonitrile Butadiene Styrene) material and a preparation method thereof. The easy-to-clean soft-touch PC / ABS material comprises the following components in parts by weight: 50-80 parts of PC resin, 20-50 parts of ABS resin, 5-20 parts of a surface modifier, 0.5-2 parts of a compatilizer and 0.5-2 parts of an auxiliary agent. The surface modifier is polysiloxane modified thermoplastic polyurethane; the compatilizer is polycarbonate type thermoplastic polyurethane. According to the invention, polysiloxane modified TPU is used as a surface modifier to be added into the PC / ABS material, so that the product can obtain high-quality appearance and excellent surface touch feeling, and the hydrophobicity and stain resistance of the product are improved at the same time; polycarbonate type polyurethane is used as an amphiphilic compatilizer, so that the compatibility between polysiloxane modified TPU and a PC / ABS matrix is remarkably improved, the impact strength of the material is improved, and layering is avoided.

Description

Technical Field

[0001] The invention relates to the technical field of polymer composite materials, in particular to an easy-to-clean soft-touch PC / ABS material and a preparation method thereof. Background Art

[0002] With the improvement of living standards and changes in consumption concepts, users' requirements for products are no longer limited to functionality and practicality, but also pay more attention to the use experience and sensory enjoyment. In this context, materials must not only have excellent physical properties, but also provide a comfortable touch and convenient maintenance experience. In recent years, health and hygiene awareness has received unprecedented attention worldwide, especially in the design of public spaces and personal products, people are paying more and more attention to the cleanliness and antibacterial properties of materials. Easy-to-clean surfaces can not only reduce the risk of germ transmission, but also extend the service life of products. In the field of industrial design, soft-touch materials are becoming increasingly popular due to the comfortable feel they provide. Whether it is consumer electronics or automotive interiors, designers are looking for materials that can make users feel happy and relaxed. At the same time, soft-touch materials can also cover surface defects and improve the overall texture of the product. PC / ABS (polycarbonate / acrylonitrile-butadiene-styrene copolymer) material combines the mechanical strength of PC and the good formability of ABS, making it an ideal engineering plastic. However, traditional PC / ABS materials often lack the characteristics of soft touch and easy cleaning. Therefore, developing a new material that retains the advantages of PC / ABS materials while providing easy-to-clean and soft touch has become an important topic in the field of materials science. Summary of the invention

[0003] The object of the present invention is to provide a PC / ABS material with an easy-to-clean soft touch and a preparation method thereof, so that the material has the mechanical strength of PC and the good formability of ABS, and also has the characteristics of soft touch and easy cleaning. The object of the present invention is achieved by the following technical solutions:

[0004] In a first aspect, the present invention provides an easy-to-clean soft-touch PC / ABS material, comprising the following components in parts by weight:

[0005] PC resin 50~80 parts

[0006] ABS resin 20-50 parts

[0007] Surface modifier 5-20 parts

[0008] Compatibilizer 0.5~2 parts

[0009] 0.5 to 2 parts of additives.

[0010] As some specific embodiments of the present invention, the PC resin is bisphenol A polycarbonate.

[0011] As some specific embodiments of the present invention, the ABS resin is an acrylonitrile-butadiene-styrene copolymer, wherein the acrylonitrile content is 10 to 30 wt.%, and the butadiene content is 10 to 30 wt.%.

[0012] As some specific embodiments of the present invention, the surface modifier is polysiloxane-modified thermoplastic polyurethane (polysiloxane-modified TPU), which is a thermoplastic polyurethane containing a polar functional group organic silicon copolymer.

[0013] As some specific embodiments of the present invention, the compatibilizer is polycarbonate thermoplastic polyurethane (polycarbonate TPU).

[0014] As some specific embodiments of the present invention, the auxiliary agent includes one or more of an antioxidant, a lubricant, a weathering agent, a release agent, and a color powder.

[0015] As some specific embodiments of the present invention, the antioxidant includes at least one of antioxidant 168, antioxidant 1010, and antioxidant 1076.

[0016] As some specific embodiments of the present invention, the lubricant includes at least one of polyethylene wax (PE wax), ethylene bisstearamide (EBS), and pentaerythritol stearate (PETs).

[0017] As some specific embodiments of the present invention, the weathering agent includes at least one of a benzotriazole ultraviolet absorber and a triazine ultraviolet absorber.

[0018] As some specific embodiments of the present invention, the release agent includes at least one of a hyperbranched auxiliary agent and a silicone masterbatch.

[0019] As some specific embodiments of the present invention, the toner includes a black masterbatch.

[0020] As some specific embodiments of the present invention, the auxiliary agent includes an antioxidant and a lubricant.

[0021] As some specific embodiments of the present invention, the auxiliary agent includes antioxidant 168, antioxidant 1010, and lubricant ethylene bis stearamide, and the mass ratio of the three is 1:1:3.

[0022] In a second aspect, the present invention provides a method for preparing the easy-to-clean soft-touch PC / ABS material as described in any one of the above items, comprising the following steps:

[0023] S1, weighing raw materials according to weight, and premixing them at high speed (through a high-speed mixer) to obtain a premix;

[0024] S2, melt-extrude the premix through a twin-screw extruder, and cool and granulate.

[0025] As some specific embodiments of the present invention, in step S2, the temperature of melt extrusion is 120-250°C.

[0026] As some specific embodiments of the present invention, in step S2, the screw speed of melt extrusion is 200-500r / min.

[0027] Compared with the prior art, the present invention has the following beneficial effects:

[0028] 1) Adding polysiloxane-modified TPU as a surface modifier to PC / ABS materials can give the product a high-quality appearance and excellent surface touch, while improving the product's hydrophobicity and stain resistance;

[0029] 2) As an amphiphilic compatibilizer, polycarbonate polyurethane can improve the compatibility between polysiloxane-modified TPU and PC / ABS matrix to a certain extent, avoiding the defect of stratification of the product. An appropriate amount of polycarbonate polyurethane can help polysiloxane-modified TPU migrate to the surface of PC / ABS products, making PC / ABS soft touch, hydrophobic and stain-resistant;

[0030] 3) The PC / ABS material of the present invention has a simple preparation method, excellent soft touch effect, good hydrophobicity and stain resistance, and can be used in scenes such as automotive interior decoration parts and home appliance housings. DETAILED DESCRIPTION

[0031] The present invention is described in detail below in conjunction with specific embodiments. The following embodiments will help those skilled in the art to further understand the present invention, but are not intended to limit the present invention in any form. It should be noted that, for those of ordinary skill in the art, several variations and improvements may be made without departing from the concept of the present invention. These all belong to the protection scope of the present invention.

[0032] Examples and Comparative Examples

[0033] The raw materials and sources used in each embodiment and comparative example are as follows:

[0034] PC resin: bisphenol A polycarbonate, Chimei PC-110;

[0035] ABS resin: acrylonitrile-butadiene-styrene copolymer, Chimei PA-757;

[0036] Surface modifier 1: polysiloxane-modified TPU, Jiahua PPSi-4190, is a TPU elastomer modified by a silicone copolymer containing polar functional groups;

[0037] Surface modifier 2: ordinary polyether TPU, Wanhua WHT-8285;

[0038] Surface modifier 3: SAN carrier polysiloxane masterbatch, polysiloxane content 50%, Jiahua GT-625;

[0039] Compatibilizer: polycarbonate TPU, Wanhua WHT-7190;

[0040] Other additives: antioxidant 168, antioxidant 1010, and lubricant ethylene bis stearamide in a mixture with a mass ratio of 1:1:3, all of which are commercially available; the same additives are used in both the examples and comparative examples.

[0041] The amounts (parts by weight) of the components in the examples and comparative examples are shown in Table 1.

[0042] Table 1 Amount of each component in the examples and comparative examples

[0043]

[0044]

[0045] The preparation methods of PC / ABS in various embodiments and comparative examples are as follows:

[0046] (1) Weigh the raw materials according to the weight parts in Table 1 and pre-mix them in a high-speed mixer;

[0047] (2) The premix obtained in step (1) is extruded and granulated through a twin-screw extruder, and the extrusion temperature is set to: 210-220° C. from zone 1 to zone 2, 220-240° C. from zone 3 to zone 5, and 240-250° C. from zone 6 to zone 10; the screw speed is set to 350 r / min.

[0048] Effect Example

[0049] The PC / ABS materials prepared in the examples and comparative examples were dried at 80°C for 4 hours, and then injection molded into standard specimens and color plates at 250°C, and the following performance tests were performed:

[0050] (1) IZOD notched impact strength: The strength test was conducted according to ASTM D256 plastic cantilever beam notched impact test, with a pendulum energy of 5.5 J, a specimen thickness of 3.2 mm, and a test temperature of 23°C;

[0051] (2) Dyne value: Use ACCU dyne pen to test the dyne value of the sample surface;

[0052] (3) Soft touch level: divided into 5 levels, level 1 represents the softest and level 5 represents the hardest. The judging panel consists of 5 people who evaluate the feeling after touching the sample. The average of the 5 people's evaluation results is taken as the evaluation result.

[0053] The results are shown in Table 2 below.

[0054] Table 2 Performance test results of embodiments and comparative examples

[0055]

[0056] It can be seen from the test results of Examples 1 to 6 and Comparative Example 1 that the addition of polysiloxane-modified TPU significantly reduces the dyne value of PC / ABS, that is, the surface tension of the material is reduced, which proves that the addition of polysiloxane-modified TPU improves the surface hydrophobicity of the PC / ABS material, thereby achieving an easy-to-clean effect; at the same time, the presence of polysiloxane-modified TPU makes the material surface softer and more elastic, so that the prepared PC / ABS material has an excellent surface soft-touch effect.

[0057] It can be seen from the test results of Comparative Example 2 that when only polysiloxane-modified TPU is added without adding a compatibilizer, although a lower dyne value and a better soft touch effect can be obtained, the material has obvious delamination defects, which affects actual use, and the impact strength of the material is significantly reduced.

[0058] In Comparative Example 3, an excessive amount of compatibilizer is added on the basis of Example 2, and the dyne value and soft-touch level values ​​thereof are significantly higher than those of Example 2, indicating that the excessive addition of compatibilizer has a negative effect on the migration of the surface modifier to the product surface, affecting the migration of the surface modifier to the product surface, resulting in poor self-cleaning and soft-touch effects; at the same time, its impact strength is also lower than that of Example 2, indicating that excessive addition of compatibilizer will also lead to a decrease in the impact strength of the material.

[0059] Comparative Example 4 adds ordinary polyether TPU to the system on the basis of Comparative Example 1, and it is found that a certain soft touch effect can be achieved, but its effect is far inferior to that of polysiloxane-modified TPU; and the dyne value of the material does not decrease significantly.

[0060] Comparative Example 5: Based on Comparative Example 1, polysiloxane masterbatch was added to the system. It was found that the polysiloxane masterbatch could reduce the dyne value and soft touch test results to a certain extent, but its effect was far inferior to the polysiloxane-modified TPU of the embodiment.

[0061] Comparative Example 6 adds ordinary polyether TPU and polysiloxane masterbatch to Comparative Example 1, and it is found that it can achieve a certain soft touch and hydrophobic effect. The soft touch is slightly improved compared with Comparative Example 5, but it is still far inferior to the polysiloxane-modified TPU of the embodiment.

[0062] The above describes the specific embodiments of the present invention. It should be understood that the present invention is not limited to the above specific embodiments, and those skilled in the art may make various modifications or variations within the scope of the claims, which do not affect the essence of the present invention.

Claims

1. An easy-to-clean soft-touch PC / ABS material, characterized in that: The composition comprises the following components in parts by weight: PC resin 50~80 parts ABS resin 20-50 parts Surface modifier 5-20 parts Compatibilizer 0.5~2 parts 0.5-2 parts of additives; The surface modifier is polysiloxane-modified thermoplastic polyurethane.

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

3. The PC / ABS material according to claim 1, characterized in that: The ABS resin is an acrylonitrile-butadiene-styrene copolymer, wherein the acrylonitrile content is 10-30wt.%, and the butadiene content is 10-30wt.%.

4. The PC / ABS material according to claim 1, characterized in that: The compatibilizer is polycarbonate type thermoplastic polyurethane.

5. The PC / ABS material according to claim 1, characterized in that: The auxiliary agent includes one or more of an antioxidant, a lubricant, a weathering agent, a release agent, and a toner.

6. The PC / ABS material according to claim 5, characterized in that: The antioxidant includes at least one of antioxidant 168 , antioxidant 1010 , and antioxidant 1076 .

7. The PC / ABS material according to claim 5, characterized in that: The lubricant includes at least one of polyethylene wax, ethylene bisstearamide, and pentaerythritol stearate.

8. The PC / ABS material according to claim 5, characterized in that: The weathering agent includes at least one of a benzotriazole ultraviolet absorber and a triazine ultraviolet absorber; And / or, the release agent comprises at least one of a hyperbranched auxiliary agent and a silicone masterbatch; And / or, the toner includes a black masterbatch.

9. A method for preparing an easy-to-clean soft-touch PC / ABS material as claimed in any one of claims 1 to 8, characterized in that: The steps include: S1, weighing raw materials according to weight, and premixing at high speed to obtain a premix; S2, melt-extrude the premix through a twin-screw extruder, and cool and granulate.

10. The preparation method according to claim 9, characterized in that: In step S2, the temperature of melt extrusion is 120-250°C; the screw speed of melt extrusion is 200-500r / min.

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