An anti-screw post cracking ABS alloy material and a preparation method thereof

Abstract

The present application relates to a kind of anti-screw post cracking ABS alloy material and its preparation method;Including 40-60 parts ABS resin, 25-55 parts PC resin, 5-10 parts glass fiber powder, 0.5-1 parts surface treatment agent, 1-2 parts compatibilizer, 0.1-1 parts other additives.Preparation, (1) glass fiber powder is mixed with surface treatment agent uniformly;(2) the remaining components are stirred uniformly and added into extruder by main feeding port;(3) the mixture of step (1) is added into extruder by side feeding, and extrusion granulation is obtained.The product is obtained.The present application is added by small size glass fiber powder, and surface modifier is reacted with glass fiber powder, and the surface of glass fiber powder is infiltrated, the bonding force of glass fiber powder and matrix is improved, the impact performance of matrix can be avoided to drop greatly, and the original impact toughness is maintained.In the process of screw post injection molding, the crosslinking effect of front glass fiber powder is greatly improved, the weld line strength is greatly improved, and the screw post cracking is effectively prevented.

Description

Technical Field

[0001] This invention belongs to the field of polymer blending and polymer molding and processing, and specifically relates to an ABS alloy material for preventing screw post cracking and its preparation method. Background Technology

[0002] ABS alloy material possesses excellent mechanical properties and is easy to paint, making it widely used in automotive interior and exterior trim, appliance housings, and other products. During use, components are typically connected using self-tapping screws or thermoplastic screws. However, screw studs, due to their relatively thin structure and the presence of weld lines, frequently crack. Therefore, ABS alloy materials that prevent screw stud cracking are in high demand in the market.

[0003] Existing anti-cracking systems for screw posts mainly address material flowability and toughening agents, but these often do not yield particularly good results. Summary of the Invention

[0004] The purpose of this invention is to address the shortcomings of the existing technology by providing an ABS alloy material for preventing screw post cracking and its preparation method.

[0005] The objective of this invention is achieved through the following technical solution:

[0006] This invention relates to an ABS alloy material for preventing screw post cracking, comprising the following components and their weight percentages:

[0007]

[0008] Furthermore, the relative molecular weight of the ABS resin is 80,000-150,000, wherein the rubber content is 5-30 wt%, the acrylonitrile content is 10-30 wt%, and the styrene content is 40-70 wt%.

[0009] Furthermore, the PC resin has a relative molecular weight of 15,000-30,000 and a glass transition temperature of 140-150°C.

[0010] Furthermore, the glass fiber powder has an aspect ratio of 10-50:1. If the aspect ratio is too low, it cannot provide physical bonding and thus cannot improve the impact resistance of the weld line in the product; if the aspect ratio is too high, it will be oriented at the flow front end and will not be able to form physical bonding, which will significantly reduce the impact resistance of the weld line in the product.

[0011] Furthermore, the surface treatment agent includes hyperbranched polyester and silane coupling agent.

[0012] Furthermore, the mass ratio of hyperbranched polyester to silane coupling agent is 1:2 to 2:1. Within this mass ratio range, it can achieve surface wetting and coupling of the filler, improving the compatibility between the filler and the substrate.

[0013] The hyperbranched polyester is a hydroxyl-terminated hyperbranched polyester with a number-average molecular weight of 500-2000. Within this molecular weight range, the high degree of molecular branching and relatively small molecular weight allow for effective wetting of the silane coupling agent-modified release fiber surface, improving the compatibility between the release fiber powder and the matrix resin.

[0014] The silane coupling agent is one or more of γ-aminopropyltrimethoxysilane (KH540), γ-aminopropyltriethoxysilane (KH550), and 3-aminopropyltrimethoxysilane (KH551). After modifying the surface of the glass fiber powder with the silane coupling agent, hyperbranched polyester is grafted onto it, resulting in better bonding between the glass fiber powder and the matrix. This allows the physical cross-bonding of the glass fiber powder generated at the flow front to continue into the matrix resin, improving the weld line strength of the material. Existing technologies, such as CN200810041484, increase the strength and toughness of the copolymer by introducing polyester components into the styrene-acrylonitrile copolymer. This toughening and reinforcement of the styrene-acrylonitrile component by the polyester component acts on the matrix portion, but does not improve the strength of the weld line portion. Furthermore, because the added glass fiber has an excessively high aspect ratio, it will orient itself at the flow front, aligning parallel to each other, failing to form physical bonds, and significantly reducing the impact resistance of the weld line in the product.

[0015] Furthermore, the compatibilizer is AS-GMA, wherein the GMA content is 0.5-2%. If the GMA content is too low, it cannot function as a compatibilizer; if the GMA content is too high, the product is prone to cross-linking and cannot be granulated.

[0016] Furthermore, the other additives include at least one of lubricants, antioxidants, and ultraviolet absorbers.

[0017] This invention also relates to a method for preparing an ABS alloy material to prevent screw post cracking, specifically including the following steps:

[0018] S1. Mix the glass fiber powder and the surface treatment agent evenly;

[0019] S2. Mix the remaining components evenly and add them to the extruder through the main feed port of the twin-screw extruder;

[0020] S3. The mixture obtained in step S1 is added to the extruder through the feed port on the side of the extruder for extrusion granulation to obtain the product.

[0021] Furthermore, the barrel temperature of the twin-screw extruder is 160-240℃, the screw speed is 200-600rpm, and the pressure is 1.5-2.5MPa.

[0022] Compared with the prior art, the present invention has the following beneficial effects:

[0023] 1) This invention incorporates small-sized glass fiber powder and a surface modifier that reacts with the glass fiber powder to wet the surface of the glass fiber powder, thereby improving the bonding strength between the glass fiber powder and the substrate. This prevents a significant decrease in the impact performance of the substrate and maintains its original impact toughness. During the injection molding process of the screw post, the cross-linking effect of the front-end glass fiber powder significantly improves the weld line strength, effectively preventing the screw post from cracking.

[0024] 2) The anti-screw post cracking ABS alloy material of the present invention can be widely used in automotive interior parts, large household appliance shells, small household appliance shells, mobile phones and other products, and has a good application prospect. Detailed Implementation

[0025] The present invention will now be described in detail with reference to specific embodiments. These embodiments will help those skilled in the art to further understand the present invention, but do not limit the invention in any way. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention. These all fall within the scope of protection of the present invention.

[0026] The raw materials used in the following examples and comparative examples are:

[0027] The ABS resin used is ABS8391, produced by Takahashi Petrochemical; the PC resin used is L-1250Y from Asahi Kasei; the glass fiber powder A is XGFA1150, with a glass fiber diameter of 11µm and an average glass fiber length of 300µm, produced by Shenzhen Xiangu High Technology Co., Ltd.; the glass fiber powder B has an aspect ratio of 5:1, produced by Chongqing International; the glass fiber powder C has an aspect ratio of 75:1, produced by Chongqing International; the surface treatment agent A is hyperbranched polyester HyPerC100: silane coupling agent KH550 in a 1:1 ratio; the compatibilizer used is SAG001, produced by Rizhisheng Fine Chemicals; other additives include antioxidant B900 (Ciba Fine Chemicals), ultraviolet absorber Tinuvins UVP (Ciba), and lubricant barium stearate, with each additive in a weight ratio of 1:1:1.

[0028] The ABS alloy materials prepared in Examples 1-4 and Comparative Examples 1-8 were dried at 80°C for 5 hours, and then injection molded into test blocks under the same injection molding conditions according to ASTM standards for physical property testing. Simultaneously, screw hole cracking tests were performed on the materials; the specific test standards and conditions are shown in Table 1.

[0029] Table 1

[0030]

[0031] The screw hole cracking experiment was conducted using an M3 self-tapping screw with a plastic screw hole inner diameter of 2.6 mm. A torque of 25 N was applied to tighten the screw, and the screw post was observed for any cracking.

[0032] Example 1

[0033] This embodiment provides an ABS alloy material for preventing screw post cracking and its preparation method. The specific steps are as follows:

[0034] (1) Weigh each component according to the weight ratio in Table 2;

[0035] (2) Mix glass fiber powder with surface treatment agent, stir evenly, and let stand for later use;

[0036] (3) Mix the remaining components evenly in the mixing tank and add them into the extruder through the main feed port of the twin-screw extruder;

[0037] (4) The mixture obtained in step (2) is added to the extruder through the side feed port of the extruder for extrusion granulation. After melt extrusion, cooling, drying and pelletizing, the sample is obtained.

[0038] The twin-screw extruder is a co-rotating twin-screw extruder with a screw length-to-diameter ratio of 40:1. The screw barrel is equipped with a vacuum extraction device and a temperature control device. The feed section temperature of the twin-screw extruder is 160℃, the plasticizing section temperature is 220℃, the homogenizing section temperature is 240℃, the screw speed is 400rpm, and the pressure is 2.5MPa.

[0039] Example 2

[0040] This embodiment provides an ABS alloy material for preventing screw post cracking and its preparation method. The weight ratio of raw materials is shown in Table 2, and the preparation method is the same as in Embodiment 1.

[0041] Example 3

[0042] This embodiment provides an ABS alloy material for preventing screw post cracking and its preparation method. The weight ratio of raw materials is shown in Table 2, and the preparation method is the same as in Embodiment 1.

[0043] Example 4

[0044] This embodiment provides an ABS alloy material for preventing screw post cracking and its preparation method. The weight ratio of raw materials is shown in Table 2, and the preparation method is the same as in Embodiment 1.

[0045] Comparative Example 1

[0046] This comparative example provides an ABS alloy material for preventing screw post cracking and its preparation method. The weight ratio of the raw materials is shown in Table 2, and the preparation method is the same as in Example 1.

[0047] Comparative Example 2

[0048] This comparative example provides an ABS alloy material for preventing screw post cracking and its preparation method. The weight ratio of the raw materials is shown in Table 2, and the preparation method is the same as in Example 1.

[0049] Comparative Example 3

[0050] This comparative example provides an ABS alloy material for preventing screw post cracking and its preparation method. The weight ratio of raw materials is shown in Table 2. The preparation method is to mix each component evenly in a mixing tank and directly add it to the extruder through the main feed port for extrusion granulation. Other processing technology is the same as in Example 1.

[0051] Comparative Examples 4-8

[0052] Comparative Examples 4-8 respectively provide an ABS alloy material for preventing screw post cracking and its preparation method. The weight ratio of raw materials is shown in Table 2, and the preparation method is the same as in Example 1.

[0053] Table 2

[0054]

[0055]

[0056] The physical properties and light resistance test results of the ABS resins in Examples 1-4 and Comparative Examples 1-8 are shown in Table 3 below.

[0057] Table 3

[0058]

[0059] The test results of Examples 1-4 and Comparative Examples 1-8 in Table 3 show that by adding surface modifier and glass fiber powder, the interaction force between the filler and the matrix is ​​improved by the cross-action of glass fiber powder on the surface modifier, so that the sample has a significant anti-screw column cracking effect.

[0060] In summary, this invention provides an ABS alloy material for preventing screw post cracking and its preparation method; comprising the following components: 40-60 parts of ABS resin, 25-55 parts of PC resin, 5-10 parts of glass fiber powder, 0.5-1 parts of surface treatment agent, 1-2 parts of compatibilizer, and 0.1-1 parts of other additives. The preparation method is as follows: (1) mix glass fiber powder and surface treatment agent, stir evenly, and let stand for later use; (2) stir the remaining components evenly in a mixing tank, and add them to the extruder through the main feed port of the twin-screw extruder; (3) add the mixture obtained in step (1) to the extruder through the side feed port of the extruder, and extrude and granulate to obtain the product. Compared with the prior art, by adding small-sized glass fiber powder and reacting the surface modifier with the glass fiber powder to wet the surface of the glass fiber powder, the bonding force between the glass fiber powder and the substrate can be improved, which can avoid a significant decrease in the impact performance of the substrate and maintain the original impact toughness. During the injection molding process of the screw stud, the cross-linking effect of the glass fiber powder at the front end significantly improves the weld line strength, effectively preventing the screw stud from cracking. This invention can be widely applied to automotive interior parts, large appliance housings, small appliance housings, mobile phones, and other products, and has broad application prospects.

[0061] This invention has many specific applications, and the above description is only a preferred embodiment. It should be noted that the above embodiments are for illustrative purposes only and are not intended to limit the scope of protection of this invention. For those skilled in the art, several improvements can be made without departing from the principle of this invention, and these improvements should also be considered within the scope of protection of this invention.

Claims

1. A composition of ABS alloy material for preventing screw post cracking, characterized in that, The components include the following parts by weight: 40-60 parts of ABS resin 25-55 parts of PC resin 5-10 parts of glass fiber powder 0.5-1 part surface treatment agent, 1-2 parts compatibilizer Other adjuvants: 0.1-1 part; The aspect ratio of the glass fiber powder is 10-50:1; The surface treatment agent comprises hyperbranched polyester and silane coupling agent in a mass ratio of 1:2 to 2:

1.

2. The ABS alloy material composition according to claim 1, characterized in that, The ABS resin has a relative molecular weight of 80,000-150,000, and contains 5-30 wt% rubber, 10-30 wt% acrylonitrile, and 40-70 wt% styrene.

3. The ABS alloy material composition according to claim 1, characterized in that, The PC resin has a relative molecular weight of 15,000-30,000 and a glass transition temperature of 140-150℃.

4. The ABS alloy material composition according to claim 1, characterized in that, The hyperbranched polyester is a hydroxyl-terminated hyperbranched polyester with a number-average molecular weight of 500-2000.

5. The ABS alloy material composition according to claim 1, characterized in that, The silane coupling agent is one or more of γ-aminopropyltrimethoxysilane and γ-aminopropyltriethoxysilane.

6. The ABS alloy material composition according to claim 1, characterized in that, The compatibilizer is AS-GMA, wherein the GMA content is 0.5-2%.

7. A method for preparing an ABS alloy material composition according to any one of claims 1-6, characterized in that, The method includes the following steps: S1. Mix the glass fiber powder and the surface treatment agent evenly; S2. Mix the remaining components evenly and add them to the extruder through the main feed port of the twin-screw extruder; S3. The mixture obtained in step S1 is added to the extruder through the feed port on the side of the extruder for extrusion granulation to obtain the product.

8. The method for preparing the ABS alloy material composition according to claim 7, characterized in that, The twin-screw extruder has a barrel temperature of 160-240℃, a screw speed of 200-600rpm, and a pressure of 1.5-2.5 MPa.

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