Regenerated polyamide composition for replacing steel with plastic and preparation method thereof

Abstract

The invention discloses a regenerated polyamide composition for replacing steel with plastic and a preparation method of the regenerated polyamide composition. The composition is prepared from the following components in parts by weight: 21.2-23.1 parts of regenerated polyamide resin, 75 parts of a reinforcing agent, 0.2-0.3 part of an antioxidant, 0.5-1 part of a lubricating agent, 1-2 parts of organic black masterbatch and 0.2-0.5 part of a fluidity improving agent. According to the polyamide composition disclosed by the invention, the polyamide regenerated resin is used as a main raw material, the fluidity improver and the organic black master batch are used for modifying the polyamide regenerated resin, the glass fiber is used as a reinforcing agent for reinforcing and modifying the polyamide regenerated resin, and the fluidity improver and the organic black master batch are added, so that the crystallization temperature of a polyamide material is reduced, and the fluidity of the material is improved; the problems of appearance and fluidity of the high glass fiber reinforced regenerated polyamide material are solved.

Description

Technical Field

[0001] The invention relates to the field of thermoplastic recycled polyamide compositions, in particular to a recycled polyamide composition for replacing steel with plastic and a preparation method thereof. Background Art

[0002] "Plastics instead of steel" refers to the use of plastic materials to replace traditional steel in manufacturing. This trend is becoming more and more common in many industries, especially in the fields of automobiles, electronics and electrical, smart homes, photovoltaics, etc. As a high-performance plastic material, polyamide compositions play an important role in "plastics instead of steel" products due to their excellent mechanical properties, durability, corrosion resistance, heat resistance and other characteristics.

[0003] In plastic products that replace steel with plastic, reinforcing agents are usually used to significantly improve the mechanical properties of polyamide products by increasing the rigidity and strength of the material. However, the compatibility of reinforcing agents with the matrix is ​​poor, which will lead to appearance problems such as increased roughness, reduced gloss, deformation and warping of the products. How to optimize the formula and process of polyamide compositions to improve their appearance is a problem that needs to be solved urgently. Summary of the invention

[0004] In view of this, the present invention provides a recycled polyamide composition for replacing steel with plastic and a preparation method thereof to solve the problems raised in the above-mentioned background technology, and improves the fluidity of the material and reduces the crystallinity through organic black masterbatch and fluidity improver to ensure that the material has a better appearance.

[0005] To achieve the above object, the present invention provides the following technical solutions:

[0006] In one aspect, the present invention discloses a recycled polyamide composition for replacing steel with plastic, which is prepared from the following components in parts by weight:

[0007]

[0008] Flowability improver 0.2-0.5 parts.

[0009] As a further solution of the present invention: the polyamide recycled resin is poly(hexamethylene adipate) recycled resin.

[0010] As a further solution of the present invention: the reinforcing agent is chopped glass fiber.

[0011] As a further embodiment of the present invention: the antioxidant is 4,4'-bis(α.α-dimethylbenzyl)diphenylamine.

[0012] As a further solution of the present invention: the lubricant is at least one of pentaerythritol stearate and acidified polyethylene wax.

[0013] As a further solution of the present invention: the organic black masterbatch is an aniline black masterbatch with PA6 resin as a carrier, wherein the aniline black content is 40w%.

[0014] As a further solution of the present invention: the fluidity improver is a hydroxyl-terminated polyester.

[0015] On the other hand, the present invention discloses a method for preparing the above-mentioned polyamide composition for replacing steel with plastic, comprising the following steps:

[0016] S1. Evenly mix the polyamide recycled resin, antioxidant, lubricant, fluidity improver and organic black masterbatch to obtain a mixed material;

[0017] S2, adding the mixed material into the main feeding hopper of the twin-screw extruder, and adding a reinforcing agent into the side feed, and obtaining a polyamide composition through melting, extrusion and pelletizing.

[0018] As a further solution of the present invention: the temperature of each zone of the twin-screw extruder is 230-280°C, the main engine speed is 300-500 rpm, and the vacuum degree is ≤-0.06MPa.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] The polyamide composition of the present invention uses polyamide recycled resin as the main raw material, modifies the polyamide resin by using a fluidity improver and an organic black masterbatch, and uses glass fiber as a reinforcing agent to enhance and modify the polyamide resin. The addition of the fluidity improver and the organic black masterbatch reduces the crystallization temperature of the polyamide material, improves the fluidity of the material, and solves the problems of appearance and fluidity of the high-glass fiber reinforced recycled polyamide material. DETAILED DESCRIPTION

[0021] For ease of understanding of the present invention, the present invention will be described more fully below in conjunction with specific embodiments. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present invention more thoroughly understood.

[0022] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used in the specification of the present invention herein are only for the purpose of describing specific embodiments and are not intended to limit the present invention.

[0023] The specific information of the raw materials used in the following examples and comparative examples is as follows:

[0024] Poly(hexamethylene adipate) recycled resin (PA66), relative viscosity 3.2;

[0025] Chopped glass fiber, 10 μm in diameter and 3 mm in length, purchased from Chongqing International Composite Materials Co., Ltd.;

[0026] The lubricant is stearate purchased from Struktol, Germany, with the trade name TR044.

[0027] The antioxidant was 1098, purchased from BASF, Germany;

[0028] Organic black masterbatch N54 / 1033, purchased from Colloids, UK;

[0029] Flow improver C100 was purchased from Zhuhai Chenyuan Polymer.

[0030] It is to be understood that the above raw materials and reagents are only examples of some specific embodiments of the present invention, so that the technical solution of the present invention is clearer, and it does not mean that the present invention can only use the above reagents, and the specific scope in the claims shall prevail. In addition, the "parts" described in the examples and comparative examples, unless otherwise specified, refer to parts by weight.

[0031] Any range described in the present invention includes the end value and any numerical value between the end values ​​and any sub-range formed by the end value or any numerical value between the end values.

[0032] Example 1

[0033] S1, adding 23.1 parts of PA66 recycled resin, 0.2 parts of antioxidant, 0.5 parts of lubricant, 0.2 parts of fluidity improver and 1 part of organic black masterbatch into a drum mixer and premixing for 10 minutes to obtain a mixed material;

[0034] S2, adding the mixed material into a twin-screw extruder through a main feeding hopper, and adding 75 parts of chopped glass fibers at a side feeding point, and obtaining a recycled polyamide composition with good appearance for replacing steel through melting, extrusion and pelletizing.

[0035] Among them: the temperatures of the barrel zones of the twin-screw extruder are 230°C, 250°C, 260°C, 280°C, 275°C, 265°C, 265°C, 265°C, 275°C. The main engine speed is 400 rpm, and the vacuum degree is ≤-0.06MPa.

[0036] Example 2

[0037] S1, adding 22.1 parts of PA66 recycled resin, 0.2 parts of antioxidant, 0.5 parts of lubricant, 0.2 parts of fluidity improver and 2 parts of organic black masterbatch into a drum mixer and premixing for 10 minutes to obtain a mixed material;

[0038] S2, adding the mixed material into a twin-screw extruder through a main feeding hopper, and adding 75 parts of chopped glass fibers at a side feeding point, and obtaining a recycled polyamide composition with good appearance for replacing steel through melting, extrusion and pelletizing.

[0039] Among them: the temperatures of the barrel zones of the twin-screw extruder are 230°C, 250°C, 260°C, 280°C, 275°C, 265°C, 265°C, 265°C, 275°C. The main engine speed is 400 rpm, and the vacuum degree is ≤-0.06MPa.

[0040] Example 3

[0041] S1, adding 23 parts of PA66 recycled resin, 0.2 parts of antioxidant, 0.5 parts of lubricant, 0.3 parts of fluidity improver and 1 part of organic black masterbatch into a drum mixer and premixing for 10 minutes to obtain a mixed material;

[0042] S2, adding the mixed material into a twin-screw extruder through a main feeding hopper, and adding 75 parts of chopped glass fibers at a side feeding point, and obtaining a recycled polyamide composition with good appearance for replacing steel through melting, extrusion and pelletizing.

[0043] Among them: the temperatures of the barrel zones of the twin-screw extruder are 230°C, 250°C, 260°C, 280°C, 275°C, 265°C, 265°C, 265°C, 275°C. The main engine speed is 400 rpm, and the vacuum degree is ≤-0.06MPa.

[0044] Example 4

[0045] S1, adding 21.3 parts of PA66 recycled resin, 0.3 parts of antioxidant, 1 part of lubricant, 0.3 parts of fluidity improver and 2 parts of organic black masterbatch into a drum mixer and premixing for 10 minutes to obtain a mixed material;

[0046] S2, adding the mixed material into a twin-screw extruder through a main feeding hopper, and adding 75 parts of chopped glass fibers at a side feeding point, and obtaining a recycled polyamide composition with good appearance for replacing steel through melting, extrusion and pelletizing.

[0047] Among them: the temperatures of the barrel zones of the twin-screw extruder are 230°C, 250°C, 260°C, 280°C, 275°C, 265°C, 265°C, 265°C, 275°C. The main engine speed is 400 rpm, and the vacuum degree is ≤-0.06MPa.

[0048] Example 5

[0049] S1, adding 21.7 parts of PA66 recycled resin, 0.3 parts of antioxidant, 0.5 parts of lubricant, 0.4 parts of fluidity improver and 2 parts of organic black masterbatch into a drum mixer and premixing for 10 minutes to obtain a mixed material;

[0050] S2, adding the mixed material into a twin-screw extruder through a main feeding hopper, and adding 75 parts of chopped glass fibers at a side feeding point, and obtaining a recycled polyamide composition with good appearance for replacing steel through melting, extrusion and pelletizing.

[0051] Among them: the temperatures of the barrel zones of the twin-screw extruder are 230°C, 250°C, 260°C, 280°C, 275°C, 265°C, 265°C, 265°C, 275°C. The main engine speed is 400 rpm, and the vacuum degree is ≤-0.06MPa.

[0052] Comparative Example 1

[0053] S1, adding 23.1 parts of PA66 recycled resin, 0.2 parts of antioxidant, 0.5 parts of lubricant and 1.2 parts of organic black masterbatch into a drum mixer and premixing for 10 minutes to obtain a mixed material;

[0054] S2, adding the mixed material into a twin-screw extruder through a main feeding hopper, and adding 75 parts of chopped glass fibers at a side feeding point, and obtaining a recycled polyamide composition for plastic-substituting steel through melting, extrusion and pelletizing.

[0055] Among them: the temperatures of the barrel zones of the twin-screw extruder are 230°C, 250°C, 260°C, 280°C, 275°C, 265°C, 265°C, 265°C, 275°C. The main engine speed is 400 rpm, and the vacuum degree is ≤-0.06MPa.

[0056] Comparative Example 2

[0057] S1, adding 23.1 parts of PA66 recycled resin, 0.2 parts of antioxidant, 0.5 parts of lubricant, and 1.2 parts of fluidity improver into a drum mixer and premixing for 10 minutes to obtain a mixed material;

[0058] S2, adding the mixed material into a twin-screw extruder through a main feeding hopper, and adding 75 parts of chopped glass fibers at a side feeding point, and obtaining a recycled polyamide composition for plastic-substituting steel through melting, extrusion and pelletizing.

[0059] Among them: the temperatures of the barrel zones of the twin-screw extruder are 230°C, 250°C, 260°C, 280°C, 275°C, 265°C, 265°C, 265°C, 275°C. The main engine speed is 400 rpm, and the vacuum degree is ≤-0.06MPa.

[0060] Comparative Example 3

[0061] S1, adding 24.3 parts of PA66 recycled resin, 0.2 parts of antioxidant, and 0.5 parts of lubricant into a drum mixer and premixing for 10 minutes to obtain a mixed material;

[0062] S2, adding the mixed material into a twin-screw extruder through a main feeding hopper, and adding 75 parts of chopped glass fibers at a side feeding point, and obtaining a recycled polyamide composition for plastic-substituting steel through melting, extrusion and pelletizing.

[0063] Among them: the temperatures of the barrel zones of the twin-screw extruder are 230°C, 250°C, 260°C, 280°C, 275°C, 265°C, 265°C, 265°C, 275°C. The main engine speed is 400 rpm, and the vacuum degree is ≤-0.06MPa.

[0064] The recycled polyamide compositions obtained in the examples and comparative examples were subjected to performance tests, and the test items and results are shown in Table 1. The appearance evaluation was performed by evaluating the floating fiber exposure state through injection molding color plates, with 0-5 representing the appearance grade of the product, and the larger the value, the less floating fiber exposure; the crystallization peak temperature was detected by differential scanning calorimetry (DSC);

[0065] Table 1

[0066]

[0067] Although this specification is described according to implementation modes, not every implementation mode includes only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

[0068] Therefore, the above description is only a preferred embodiment of the present application and is not intended to limit the scope of implementation of the present application; that is, all equivalent changes made according to the scope of the claims of the present application are within the protection scope of the claims of the present application.

Claims

1. A recycled polyamide composition for replacing steel with plastic, characterized in that: It is prepared from the following components in parts by weight:

2. The recycled polyamide composition for replacing steel with plastic according to claim 1, characterized in that: The polyamide recycled resin is polyhexamethylene adipate recycled resin.

3. The recycled polyamide composition for replacing steel with plastic according to claim 1, characterized in that: The reinforcing agent is chopped glass fiber.

4. The recycled polyamide composition for replacing steel with plastic according to claim 1, characterized in that: The antioxidant is 4,4'-bis(α.α-dimethylbenzyl)diphenylamine.

5. The recycled polyamide composition for replacing steel with plastic according to claim 1, characterized in that: The lubricant is at least one of pentaerythritol stearate and acidified polyethylene wax.

6. The recycled polyamide composition for replacing steel with plastic according to claim 1, characterized in that: The organic black masterbatch is an aniline black masterbatch with PA6 resin as a carrier, wherein the aniline black content is 40w%.

7. The recycled polyamide composition for replacing steel with plastic according to claim 1, characterized in that: The fluidity improver is hydroxyl-terminated polyester.

8. A method for preparing the polyamide composition for replacing steel with plastic as claimed in any one of claims 1 to 7, characterized in that: The following steps are involved: S1. Evenly mix the polyamide recycled resin, antioxidant, lubricant, fluidity improver and organic black masterbatch to obtain a mixed material; S2, adding the mixed material into the main feeding hopper of the twin-screw extruder, and adding a reinforcing agent into the side feed, and obtaining a polyamide composition through melting, extrusion and pelletizing.

9. The preparation method according to claim 8, characterized in that: The temperature of each zone of the twin-screw extruder is 230-280° C., the main engine speed is 300-500 rpm, and the vacuum degree is ≤-0.06 MPa.

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