Black pa / ABS resin composition and preparation method therefor

Abstract

Disclosed is a black PA / ABS resin composition, comprising the following components in parts by weight: 30-80 parts of PA6 resin, 10-30 parts of ABS resin, 10-30 parts of an inorganic filler, 0.1-1 part of carbon black, and 0.1-1 part of an auxiliary agent. By using the polymer composition provided by the present invention to carry out laser marking on products, images are clear, mark colors are stable, and the mark warpage is low.

Description

A black PA / ABS resin composition and preparation method thereof Technical Field

[0001] The invention belongs to the technical field of polymer materials, and in particular relates to a black PA / ABS resin composition and a preparation method thereof. Background Art

[0002] Modified plastics are widely used in various industries, including automobiles and consumer electronics. With the development trend of social informatization, the requirements for product quantification, identification, and traceability are becoming increasingly stringent. Effective product identification and marking is a key market demand.

[0003] Laser marking technology is gaining increasing popularity and application due to its clean, environmentally friendly, and efficient advantages. Black plastic products account for a significant portion of the market, creating a significant demand for laser marking on these products. Black-on-white laser marking is currently a mainstream application for modified plastics. However, current practical applications still present issues such as unclear marking, unstable color, and high warpage, necessitating optimization of these products. Summary of the Invention

[0004] An embodiment of the present invention provides a black PA / ABS resin composition, which includes the following components in parts by weight: 30 to 80 parts of PA6 resin, 10 to 30 parts of ABS resin, 10 to 30 parts of inorganic filler, 0.1 to 1 part of carbon black, and 0.1 to 1 part of additives.

[0005] Preferably, the following components are included in parts by weight: 50-60 parts of PA6 resin, 20-25 parts of ABS resin, 20-25 parts of inorganic filler, 0.4-0.6 parts of carbon black, and 0.2-0.4 parts of additives.

[0006] Specifically, the relative viscosity of PA6 resin is 2.0-3.0. For the specific viscosity test method, please refer to ISO 307-2007, wherein the solvent used for PA6 resin is 96% concentrated sulfuric acid at 25°C.

[0007] The mass percentage of the PA resin in the black PA / ABS resin composition is not less than 39%, and further, not less than 50%.

[0008] Specifically, ABS resin is an acrylonitrile-butadiene-styrene terpolymer with a melt index range of 30 to 70 g / ml, tested according to ISO 1133-2022, and tested at a temperature of 220° C. and a load of 10 kg.

[0009] Specifically, the butadiene content of the ABS resin is 16-26 wt %, preferably 18-20 wt %. The average particle size of the rubber phase in the ABS resin is 100-500 nm, preferably 150-500 nm. Applicants have discovered that the rubber phase particle size of the ABS resin specified in the present invention achieves better results in the PA6 / ABS alloy blend.

[0010] The rubber particle size test method is as follows: through injection molding specimens, the rubber phase is etched by solvent etching; then the SEM is used to observe and statistically calculate the average particle size of the pore diameters of the etched rubber phase.

[0011] Specifically, the inorganic filler is at least one of talc, calcium carbonate, kaolin, glass fiber powder, mica, or wollastonite. The addition of the inorganic filler helps improve warpage and enhance material rigidity, while also facilitating the dispersion of carbon black and enhancing the whiteness of the marking. The average particle size of the inorganic filler is in the range of 5-15 microns.

[0012] The particle size is measured by laser diffraction.

[0013] Specifically, the carbon black can be added in the form of a masterbatch, wherein the carbon black masterbatch uses polyethylene as a carrier resin and the carbon black content in the masterbatch is 40 to 60 wt %. The carbon black can be selected from at least one of lamp black, acetylene black, furnace black, and channel black.

[0014] Specifically, the auxiliary agent is an antioxidant auxiliary agent, which is one or more of hindered phenols, hindered amines, phosphites or thioethers, specifically antioxidant 1010, antioxidant 1098, antioxidant 168, and antioxidant 412S.

[0015] The present invention also provides a method for preparing the polymer composition, comprising:

[0016] The raw material components are added into a high-speed mixer according to weight and mixed evenly, and then added into a twin-screw extruder for melt mixing and traction granulation.

[0017] A black PA / ABS resin composition was prepared according to the above preparation method.

[0018] The present invention also provides the use of the laser-marked polymer composition as described above in laser marking materials, and is particularly suitable for black-on-white laser marking.

[0019] The polymer composition provided by the present invention is used to perform laser marking on products. The ABS resin and the inorganic filler can improve the laser marking effect of the composition. The image marked on the product of the composition is clear, the marking color is stable, and the product warping is low. DETAILED DESCRIPTION

[0020] In order to enable those skilled in the art to better understand the solutions of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below.

[0021] The types and types of PA6 resin, ABS resin, talcum powder, carbon black and antioxidant used in the following examples and comparative examples are as follows:

[0022] Nylon 6: PA6-1, M2000 viscosity 2.0, Xinhui Meida;

[0023] Nylon 6: PA6-2, HY2500A viscosity 2.5, Haiyang, Jiangsu;

[0024] Nylon 66: PA66, U2501, viscosity 2.1, INVISTA;

[0025] Acrylonitrile-butadiene-styrene copolymer: ABS-1D-670, butadiene content 18.5%, average particle size 150-300nm, Guoqiao Petrochemical;

[0026] Acrylonitrile-butadiene-styrene copolymer: ABS-2:745N, butadiene content 24%, average particle size 150-300nm, Kumho;

[0027] Acrylonitrile-butadiene-styrene copolymer: ABS-2: D-670, butadiene content 18.5%, average particle size 350-500nm, Guoqiao Petrochemical;

[0028] Acrylonitrile-styrene copolymer: SAN, SAN310, commercially available;

[0029] Talc: AH-1250N6, average particle size 6-10um;

[0030] Carbon black: PE2718, carbon black content 50wt%, carrier resin is polyethylene, the amount of carbon black in Table 1-2 has been converted to the weight of pure carbon black;

[0031] Additive: Antioxidant 1098, commercially available.

[0032] Example 1

[0033] The raw materials were mixed uniformly in a high-speed mixer according to the composition ratios shown in Table 1. The mixture was then added to a twin-screw extruder for melt mixing, followed by traction granulation. Color plates were injection molded and the laser marking of the plates was evaluated. The injection molded plates were 60*50*2mm in size and were marked using a TETE brand infrared laser marking device at a fixed marking height of 60cm, a marking power of 30%, a scanning speed of 1500mm / s, and a frequency of 30Hz.

[0034] In Examples 2-8 and Comparative Examples 1-3, compositions were prepared according to the component contents specified in Table 1 and the method shown in Example 1, and color plates were injection molded. The color difference and warping effects of laser marking on the color plates were evaluated.

[0035] Table 1. Components of each embodiment (parts by weight)

[0036] Table 2. Components of each comparative example (parts by weight)

[0037] In the present invention, the color difference test can be performed using a colorimeter to measure the L value after marking to determine the whiteness of the marking. The higher the L value, the whiter the marking. The warpage test can be performed on a 100*100*1.5mm injection-molded square plate to measure the warpage height. Specifically, the injection-molded square plate is placed horizontally on a table, a weight is used to press down one corner of the square plate, and a caliper is used to measure the maximum warpage distance from the opposite corner to the table.

[0038] Table 2 shows the performance test results of the injection molded plates of Examples 1-7 and Comparative Examples 1-3 after laser marking.

[0039] Table 2. Test results of various embodiments and comparative examples

[0040] According to Examples 1-8, the black PA / ABS resin composition of the present invention has excellent warping resistance, clear marking effect, a warping degree of less than 6.5 mm, and an L value of more than 26 after laser marking.

[0041] Obviously, the above embodiments are merely examples for clarity of explanation and are not intended to limit the implementation methods. Those skilled in the art will readily appreciate that other variations or modifications based on the above descriptions are possible. It is not necessary and impossible to enumerate all implementation methods here. Obvious variations or modifications arising therefrom remain within the scope of protection of the present invention.

[0042] The above descriptions are only partial embodiments of the present invention. It should be pointed out that ordinary technicians in this technical field can make several improvements and modifications without departing from the principles of the present invention. These improvements and modifications should also be regarded as within the scope of protection of the present invention.

Claims

1. A black PA / ABS resin composition, characterized in that: The composition comprises the following components in parts by weight: 30 to 80 parts of PA6 resin, 10 to 30 parts of ABS resin, 10 to 30 parts of inorganic filler, 0.1 to 1 part of carbon black and 0.1 to 1 part of auxiliary agent.

2. The black PA / ABS resin composition according to claim 1, characterized in that: The composition comprises the following components in parts by weight: 50-60 parts of PA6 resin, 20-25 parts of ABS resin, 20-25 parts of inorganic filler, 0.4-0.6 parts of carbon black and 0.2-0.4 parts of auxiliary agent.

3. The black PA / ABS resin composition according to claim 1, characterized in that: The relative viscosity of PA6 resin is 2.0-3.

0.

4. The black PA / ABS resin composition according to claim 1, characterized in that: The butadiene content in ABS resin is 16-26wt%.

5. The black PA / ABS resin composition according to claim 4, characterized in that: The average particle size of the rubber phase in the ABS resin is 100 to 500 nm.

6. The black PA / ABS resin composition according to claim 1, characterized in that: The inorganic filler is at least one of talc, calcium carbonate, kaolin, glass fiber powder, mica or wollastonite.

7. The black PA / ABS resin composition according to claim 1, characterized in that: The carbon black is added in the form of masterbatch, the carbon black masterbatch uses polyethylene as a carrier resin, and the carbon black content in the carbon black masterbatch is 40-60wt%.

8. The black PA / ABS resin composition according to claim 1, characterized in that: The auxiliary agent is an antioxidant auxiliary agent, which is one or more of hindered phenols, hindered amines, phosphites or thioethers.

9. A method for preparing the black PA / ABS resin composition as claimed in claims 1 to 8, characterized in that: include: The raw material components are added into a high-speed mixer according to weight and mixed evenly, and then added into a twin-screw extruder for melt mixing and traction granulation.

10. Use of the black PA / ABS resin composition according to claims 1 to 8 in laser marking materials.

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