Foaming mold and foaming method for plastic elastomer

Abstract

The foaming mold comprises a lower mold plate and an upper mold plate, the lower portion of the lower mold plate is connected with a feeding pipe, the upper portion of the upper mold plate is connected with an exhaust pipe, and the lower mold plate and the upper mold plate are provided with a plurality of positioning columns and a plurality of positioning holes respectively, the lower mold plate and the upper mold plate form a mold cavity for molding the plastic elastomer, the upper mold plate is provided with an exhaust hole connected to the exhaust pipe and the mold cavity, the lower mold plate is provided with a feeding hole connected with the feeding pipe, the feeding hole is provided with a plurality of feeding channels, and the feeding channels are connected with a plurality of first feeding holes and a plurality of second feeding holes which are connected to the mold cavity. The foaming effect of the plastic elastomer finished product can be guaranteed, the foaming quality of the plastic elastomer finished product can be improved, the foaming master batch and the foaming agent are subjected to temperature-resistant modification, the foaming process is suitable for a traditional injection molding machine and a foaming mold, the special injection molding machine and the foaming mold do not need to be replaced, enterprise investment is reduced, and economic benefits of enterprises are guaranteed.

Description

Technical Field

[0001] The invention relates to the technical field of foaming moulds, in particular to a foaming mould and a foaming method for a plastic elastomer. Background Art

[0002] Plastic elastomers mainly include thermoplastic elastomers (TPE), thermosetting elastomers, elastomer blends and multipolymer elastomers (TPO). Different types of plastic elastomers have their own unique characteristics and application fields, and they play an important role in modern chemical, machinery, medical, automotive and other industries. Foaming molding refers to the process of forming a honeycomb or porous structure of plastic elastomers under given temperature and pressure conditions by adding and reacting physical or chemical foaming agents. Foaming treatment of plastic elastomers can greatly reduce the density of the material, thereby reducing the use of raw materials and thus reducing production costs; and foaming treatment can improve the physical properties of plastic elastomers, such as shock absorption, heat preservation and water absorption. The pore structure inside the foamed material can absorb impact, reduce noise, and provide better insulation effect. Therefore, the foaming treatment of plastic elastomers is a very important step.

[0003] At present, the foaming methods in the plastic elastomer industry include extrusion foaming, injection molding foaming, molded foaming, calendering foaming, powder foaming and spraying foaming, etc. Among them, injection molding foaming is one of the most commonly used foaming molding methods, and plastic elastomers mainly adopt injection molding foaming molding process. However, since the injection molding foaming temperature of plastic elastomers is higher than the foaming temperature of conventional plastics, and the dispersion temperature of the foaming agent is lower, the injection molding foaming process of plastic elastomers requires a dedicated injection molding machine and a dedicated foaming mold. Since the price of a dedicated injection molding machine and a dedicated foaming mold is much higher than that of existing injection molding machines and foaming molds, this requires enterprises to make additional investments, which reduces the economic benefits of enterprises. Moreover, whether it is a dedicated foaming mold or an existing foaming mold, a single-flow feeding method is used to inject the material into the cavity of the foaming mold for molding. In this process, the single-flow feeding may cause stress concentration of the plastic elastomer in the cavity due to uneven flow rate, which in turn leads to different foaming effects of the finished plastic elastomer, affecting the foaming quality. Summary of the invention

[0004] In order to solve the technical problems in the prior art that the injection molding and foaming process of plastic elastomers requires a dedicated injection molding machine and a dedicated foaming mold due to different injection molding and foaming temperatures, which reduces the economic benefits of the enterprise, and that single-channel feeding may affect the foaming quality, the present invention provides the following technical solution.

[0005] The present invention provides a foaming mold for a plastic elastomer, comprising a lower template with a feed pipe connected to the lower part and an upper template with an exhaust pipe connected to the upper part, the lower template and the upper template are respectively provided with a plurality of positioning columns and a plurality of positioning holes that are matched and connected to each other, the lower template and the upper template form a cavity for molding the plastic elastomer, the upper template is provided with an exhaust hole connected to the exhaust pipe and the cavity, the lower template is provided with a feed hole connected to the feed pipe, the feed hole is provided with a plurality of feed channels, and the feed channels are connected with a plurality of first feed ports and a plurality of second feed ports connected to the cavity.

[0006] As a further technical solution, the feed channels are evenly distributed in the lower template, and the first feed port and the second feed port are respectively distributed in the middle position and surrounding positions below the cavity.

[0007] As a further technical solution, the inner diameters of the first feed port and the second feed port are smaller than the inner diameter of the feed hole.

[0008] As a further technical solution, the exhaust hole is connected to a plurality of exhaust channels evenly distributed in the upper template, and the exhaust channel is connected to a first exhaust hole and a second exhaust hole connected to the cavity.

[0009] As a further technical solution, the first air outlet and the second air outlet are respectively distributed at a middle position and surrounding positions above the cavity.

[0010] The present invention also includes a method for foaming a plastic elastomer, comprising the following steps:

[0011] S1: Foaming masterbatch for making plastic elastomers;

[0012] S2: Add the foaming masterbatch into the injection molding machine, and melt the foaming masterbatch through the heating barrel of the injection molding machine;

[0013] S3: injecting the molten mixture into a foaming mold, and under the low pressure in the foaming mold, the molten mixture expands and forms a foam structure;

[0014] S4: The mixture of the foam structure in the foaming mold solidifies during the cooling process to form a plastic elastomer with a honeycomb structure.

[0015] As a further technical solution, in step S3, the molten mixture enters the cavity of the foaming mold from the feed pipe through the feed hole and the feed pipe and from the first feed port and the second feed port respectively for foaming.

[0016] As a further technical solution, in step S1, the raw materials of the foaming masterbatch include the following components in parts by weight: 50-80 parts of masterbatch carrier, 2-15 parts of main foaming agent, 1-4 parts of auxiliary foaming agent, 0.5-1.5 parts of antioxidant, 0.2-1 parts of dewatering agent, 1-3 parts of nucleating agent, 0.5-5 parts of dispersant, and 0.2-2 parts of modifier.

[0017] As a further technical solution, the raw materials of the foaming masterbatch include the following components in parts by weight: 65 parts of masterbatch carrier, 8 parts of main foaming agent, 2.5 parts of auxiliary foaming agent, 1 part of antioxidant, 0.6 parts of dewatering agent, 2 parts of nucleating agent, 3 parts of dispersant, and 1.2 parts of modifier.

[0018] As a further technical solution, the preparation process of the foaming masterbatch includes mixing and stirring, banburying processing, single-screw granulation and dehydration packaging.

[0019] The beneficial effects of the present invention are as follows: the foaming mold of the present invention improves the traditional mold, adopts the method of feeding from the bottom and exhausting from the top for foaming molding, uniformly feeds from multiple parts of the cavity at the bottom of the lower template, ensures uniform feeding, and reduces the stress concentration of the plastic elastomer in the cavity; and exhausts in multiple directions at the top of the upper template, which can effectively discharge the gas inside the mold, prevent the plastic elastomer from generating bubbles or holes during the injection molding and foaming process, ensure the foaming effect of the finished plastic elastomer, and improve the foaming quality of the finished plastic elastomer. The present invention performs temperature-resistant modification on the traditional foaming masterbatch and foaming agent, so that the foaming agent can withstand high temperature with the masterbatch carrier, and the decomposition temperature of the foaming agent is increased to meet the special foaming temperature of the plastic elastomer, so that it can be applied to the traditional injection molding machine and foaming mold, and there is no need to replace the special injection molding machine and foaming mold, which reduces the investment of the enterprise and ensures the economic benefits of the enterprise. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a structural schematic diagram of a foaming mold for a plastic elastomer of the present invention;

[0021] Figure 2 It is a schematic structural diagram of the lower mold plate of the foaming mold of the plastic elastomer of the present invention;

[0022] Figure 3 It is a longitudinal cross-sectional schematic diagram of the lower mold plate of the foaming mold of the plastic elastomer of the present invention;

[0023] Figure 4 It is a structural schematic diagram of an upper mold plate of a foaming mold for a plastic elastomer of the present invention;

[0024] Figure 5 It is a longitudinal cross-sectional schematic diagram of the upper mold plate of the foaming mold of the plastic elastomer of the present invention;

[0025] Figure 6 It is a horizontal cross-sectional schematic diagram of the upper mold plate of the foaming mold of the plastic elastomer of the present invention;

[0026] In the figure: 1-upper template; 101-positioning hole; 102-exhaust hole; 103-exhaust channel; 2-lower template; 201-positioning column; 202-feed hole; 203-feed channel; 3-exhaust pipe; 4-feed pipe; 5-cavity; 6-first feed port; 7-second feed port; 8-first air outlet; 9-second air outlet; 10-plastic elastomer. DETAILED DESCRIPTION

[0027] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention. It should be noted that the embodiments of the present invention and the features in the embodiments can be combined with each other without conflict.

[0028] In the description of the present invention, it should be understood that the terms "upper" and "lower" are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", etc. are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. In the description of the present invention, unless otherwise specified, "plurality" means two or more.

[0029] like Figure 1 As shown, a foaming mold for a plastic elastomer of the present invention is improved on the existing conventional foaming mold, and includes a lower mold plate 2 and an upper mold plate 1. The lower part of the lower mold plate 2 is connected to a feed pipe 4, and the feed pipe 4 is connected to the existing injection molding machine, and is used to feed the melted foaming masterbatch between the lower mold plate 2 and the upper mold plate 1. The upper part of the upper mold plate 1 is connected to an exhaust pipe 3, and the exhaust pipe 3 is used to discharge the excess gas from foaming. The lower mold plate 2 and the upper mold plate 1 are respectively provided with a plurality of positioning columns 201 and a plurality of positioning holes 101 that are matched and connected to each other. The positioning columns 201 and the positioning holes 101 cooperate to seal and mold the lower mold plate 2 and the upper mold plate 1. The lower mold plate 2 and the upper mold plate 1 form a cavity 5 for molding the plastic elastomer 10. The shape of the plastic elastomer 10 shown in the figure takes the steering wheel as an example. In actual production, it can also be a product of other shapes, and the present invention does not specifically limit it.

[0030] like Figure 2 and Figure 3As shown, in a preferred embodiment, the lower template 2 is provided with a feed hole 202 connected to the feed pipe 4, and the feed hole 202 is provided with a plurality of feed channels 203, and the aperture of the feed channel 203 is slightly smaller than that of the feed hole 202. In this embodiment, the feed channels 203 are uniformly distributed along the radial direction of the cavity 5, and the feed channels 203 are connected with a plurality of first feed ports 6 and a plurality of second feed ports 7, and the first feed ports 6 and the second feed ports 7 are both connected to the cavity 5 for feeding the cavity 5. For the plastic elastomer 10, the first feed port 6 and the second feed port 7 are respectively distributed in the middle position and the surrounding position below the cavity 5. Of course, for plastic elastomers 10 of other shapes, the first feed port 6 and the second feed port 7 can also be located at the position where the feed of the plastic elastomer is concentrated and the remote place where the feed is dispersed, and the present invention does not make any special restrictions thereon. While ensuring uniform feeding, the stress concentration of the plastic elastomer 10 in the cavity 5 is reduced.

[0031] It should be known that the inner diameters of the first feed port 6 and the second feed port 7 are both smaller than the inner diameter of the feed hole 202 , so that the material from the feed hole 202 can flow evenly to the first feed port 6 and the second feed port 7 and enter the cavity 5 .

[0032] like Figure 4 , Figure 5 and Figure 6 As shown, in a preferred embodiment, the upper template 1 is provided with an exhaust hole 102 connected to the exhaust pipe 3 and the cavity 5, the exhaust hole 102 is connected to a plurality of exhaust channels 103 evenly distributed in the upper template 1, the exhaust channel 103 is connected to the first outlet hole 8 and the second outlet hole 9 connected to the cavity 5, the first outlet hole 8 and the second outlet hole 9 are respectively distributed in the middle position and the surrounding position above the cavity 5, at this time, the excess gas generated during the foaming molding of the plastic elastic body 10 in the cavity 5 is discharged from the first outlet hole 8 and the second outlet hole 9 to the exhaust channel 103 and the exhaust hole 102, and discharged from the exhaust pipe 3. In this way, the gas inside the cavity 5 can be effectively discharged, bubbles or holes can be prevented from being generated in the plastic elastic body 10 during the injection molding foaming process, the foaming effect of the finished plastic elastic body 10 is ensured, and the foaming quality of the finished plastic elastic body 10 is improved.

[0033] The present invention also includes a method for foaming a plastic elastomer, comprising the following steps:

[0034] S1: Foaming masterbatch for making plastic elastomers;

[0035] In this step S1, the raw materials of the foaming masterbatch include the following components in parts by weight: 50-80 parts of masterbatch carrier, 2-15 parts of main foaming agent, 1-4 parts of auxiliary foaming agent, 0.5-1.5 parts of antioxidant, 0.2-1 parts of dewatering agent, 1-3 parts of nucleating agent, 0.5-5 parts of dispersant, and 0.2-2 parts of modifier.

[0036] Preferably, the raw materials of the foaming masterbatch include the following components in parts by weight: 65 parts of masterbatch carrier, 8 parts of main foaming agent, 2.5 parts of auxiliary foaming agent, 1 part of antioxidant, 0.6 parts of dewatering agent, 2 parts of nucleating agent, 3 parts of dispersant, and 1.2 parts of modifier.

[0037] The preparation process of the proportioned foaming masterbatch includes mixing and stirring, mixing and processing, single-screw granulation and dehydration packaging. The softening point of the finished foaming masterbatch is 120°C, and the melting point of the foaming masterbatch is 200-300°C.

[0038] S2: Add the foaming masterbatch into the injection molding machine, and melt the foaming masterbatch through the heating barrel of the injection molding machine;

[0039] S3: injecting the molten mixture into a foaming mold, and under the low pressure in the foaming mold, the molten mixture expands and forms a foam structure;

[0040] In this step S3, the molten mixture enters the cavity 5 of the foaming mold from the feed pipe 4 through the feed hole 202 and the feed pipe 203 and from the first feed port 6 and the second feed port 7 respectively for foaming.

[0041] S4: The mixture of the foam structure in the foaming mold solidifies during the cooling process to form a plastic elastomer with a honeycomb structure.

[0042] Since the injection molding foaming temperature of plastic elastomers is higher than that of conventional plastics, while the dispersion temperature of foaming agents is relatively low, the present invention performs temperature-resistant modification on traditional foaming masterbatches and foaming agents, so that the foaming agent can withstand high temperatures along with the masterbatch carrier, and the decomposition temperature of the foaming agent is increased to meet the special foaming temperature of the plastic elastomer, so that it can be applied to traditional injection molding machines and foaming molds.

[0043] In the embodiment of the present invention, the masterbatch carrier is PE resin, the plastic elastomer is a thermoplastic elastomer, the main foaming agent is an environmentally friendly OBSH foaming agent, and the auxiliary foaming agent is sodium bicarbonate.

[0044] Among them, the decomposition temperature range of OBSH foaming agent is 150℃ to 165℃. It has the characteristics of uniform nucleation and fine and uniform foaming pore size. It can obtain products with good pore structure and is the preferred foaming agent for plastic elastomers. Sodium bicarbonate is used as an auxiliary foaming agent. Sodium bicarbonate completely decomposes at 270℃ and produces carbon dioxide gas when heated. It can provide a stable gas source during the foaming process. The foaming is relatively smooth. There are no special requirements for injection molding machines and foaming molds. It can form a uniform and fine pore structure, thereby achieving a foaming effect.

[0045] Antioxidants can delay or inhibit oxidation reactions and protect materials from oxidation damage, thereby extending the service life of the materials and maintaining their performance. Dehydrators can remove residual moisture in foaming masterbatches to ensure the purity and performance of foaming masterbatches. Dispersants can disperse fine particles such as pigments and fillers and evenly distribute them throughout the plastic, thereby improving the processing performance and product quality of the plastic. Modifiers are used to improve the performance of foaming masterbatches, such as improving heat resistance and cold resistance. Nucleating agents are used to accelerate the crystallization rate and increase the crystal density, and can also improve the impact toughness and fracture toughness of plastic elastomers.

[0046] The foaming method of the present invention is further described below in conjunction with examples. The raw materials and reagents used in the following examples, as well as the foaming steps not described in detail, are all conventional materials and conventional steps sold on the market known to ordinary technicians in the field unless otherwise specified.

[0047] Embodiment 1:

[0048] The foaming masterbatch for making plastic elastomers, the raw materials of the foaming masterbatch include the following components by weight: 50 parts of PE resin, 2 parts of OBSH foaming agent, 1 part of sodium bicarbonate, 0.5 parts of antioxidant, 0.2 parts of dehydrating agent, 1 part of nucleating agent, 0.5 parts of dispersant, 0.2 parts of modifier. The components of the foaming masterbatch are mixed, stirred, processed by banburying, granulated by single screw, dehydrated and packaged to obtain the finished foaming masterbatch.

[0049] Add the foaming masterbatch into a conventional injection molding machine, heat the foaming masterbatch to 200-300 degrees through the heating barrel on the injection molding machine to melt the foaming masterbatch, ensuring that the foaming masterbatch can be evenly heated and reach a molten state. Inject the molten mixture into a conventional foaming mold, and under the low pressure in the conventional foaming mold, the molten mixture expands and forms a foam structure.

[0050] The mixture of the foam structure in the foaming mold solidifies during the cooling process to form a plastic elastomer with a honeycomb structure.

[0051] Embodiment 2:

[0052] The foaming masterbatch for making plastic elastomers includes the following raw materials by weight: 65 parts of masterbatch carrier, 8 parts of OBSH foaming agent, 2.5 parts of sodium bicarbonate, 1 part of antioxidant, 0.6 parts of dehydrating agent, 2 parts of nucleating agent, 3 parts of dispersant, and 1.2 parts of modifier. The components of the foaming masterbatch are mixed, stirred, processed by banburying, granulated by single screw, dehydrated and packaged to obtain the finished foaming masterbatch.

[0053] Add the foaming masterbatch to the injection molding machine, heat it to 200-300 degrees through the heating barrel on the conventional injection molding machine to melt the foaming masterbatch, ensuring that the foaming masterbatch can be evenly heated and reach a molten state. Inject the molten mixture into a conventional foaming mold, and under the low pressure in the foaming mold, the molten mixture expands and forms a foam structure.

[0054] The mixture of the foam structure in the foaming mold solidifies during the cooling process to form a plastic elastomer with a honeycomb structure.

[0055] Embodiment 3:

[0056] The foaming masterbatch for making plastic elastomers includes the following raw materials by weight: 80 parts of masterbatch carrier, 15 parts of OBSH foaming agent, 4 parts of sodium bicarbonate, 1.5 parts of antioxidant, 1 part of dehydrating agent, 3 parts of nucleating agent, 5 parts of dispersant, and 2 parts of modifier. The components of the foaming masterbatch are mixed, stirred, processed by internal mixing, single-screw granulation, dehydrated and packaged to obtain the finished foaming masterbatch.

[0057] Add the foaming masterbatch into a conventional injection molding machine, heat it to 200-300 degrees through the heating barrel on the injection molding machine to melt the foaming masterbatch, ensuring that the foaming masterbatch can be evenly heated and reach a molten state. Inject the molten mixture into a conventional foaming mold, and under the low pressure in the foaming mold, the molten mixture expands and forms a foam structure.

[0058] The mixture of the foam structure in the foaming mold solidifies during the cooling process to form a plastic elastomer with a honeycomb structure.

[0059] Comparative Example 1:

[0060] The foaming masterbatch uses 50 parts of PE resin and 2 parts of OBSH foaming agent. Other components and steps are the same as those in Example 1.

[0061] Comparative Example 2:

[0062] The foaming masterbatch uses 65 parts of PE resin and 8 parts of OBSH foaming agent. Other components and steps are the same as those in Example 2.

[0063] Comparative Example 3:

[0064] The foaming masterbatch uses 15 parts of PE resin and 4 parts of OBSH foaming agent. Other components and steps are the same as those in Example 3.

[0065] According to GB 6675.2-2014, the mechanical and physical properties of the plastic elastomers prepared in the above-mentioned Examples 1-3 and Comparative Examples 1-3 were tested and analyzed. The mechanical and physical properties of the plastic elastomers in Examples 1-3 were all qualified, while Comparative Examples 1-3 were all unqualified. According to GB 6675.3-2014, the flammability of the plastic elastomers prepared in the above-mentioned Examples 1-3 and Comparative Examples 1-3 was tested and analyzed. The mechanical and physical properties of the plastic elastomers in Examples 1-3 were all qualified, while Comparative Examples 1-3 were all unqualified. Of course, for other specific applications of plastic elastomers, other standards can also be used for testing.

[0066] It can be seen that the traditional foaming masterbatch and foaming agent of the present invention are subjected to temperature resistance modification, and the foaming agent can withstand high temperature along with the masterbatch carrier, so that the decomposition temperature of the foaming agent is increased to meet the special foaming temperature of the plastic elastomer, making it suitable for traditional injection molding machines and foaming molds.

[0067] The preferred specific implementation modes and embodiments of the present invention are described in detail above in conjunction with the accompanying drawings, but the present invention is not limited to the above implementation modes and embodiments. Various changes or equivalent substitutions can be made within the knowledge scope of those skilled in the art without departing from the concept of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed herein, and all embodiments that fall within the scope of the claims of this application belong to the scope of protection of the present invention.

Claims

1. A foaming mold for a plastic elastomer, characterized in that: The invention comprises a lower template (2) having a feed pipe (4) connected to the lower part and an upper template (1) having an exhaust pipe (3) connected to the upper part, the lower template (2) and the upper template (1) are respectively provided with a plurality of matching mutually connected positioning columns (201) and a plurality of positioning holes (101), the lower template (2) and the upper template (1) form a cavity (5) for molding a plastic elastomer (10), the upper template (1) is provided with an exhaust hole (102) connected to the exhaust pipe (3) and the cavity (5), the lower template (2) is provided with a feed hole (202) connected to the feed pipe (4), the feed hole (202) is provided with a plurality of feed channels (203), and the feed channels (203) are connected with a plurality of first feed ports (6) and a plurality of second feed ports (7) connected to the cavity (5).

2. The foaming mold for plastic elastomer according to claim 1, characterized in that: The feed channels (203) are evenly distributed in the lower template (2), and the first feed port (6) and the second feed port (7) are respectively distributed in the middle position and the surrounding positions below the cavity (5).

3. The foaming mold for plastic elastomer according to claim 1, characterized in that: The inner diameters of the first feed port (6) and the second feed port (7) are smaller than the inner diameter of the feed hole (202).

4. The foaming mold for plastic elastomer according to claim 1, characterized in that: The exhaust hole (102) is connected to a plurality of exhaust channels (103) evenly distributed in the upper mold plate (1), and the exhaust channels (103) are connected to a first exhaust hole (8) and a second exhaust hole (9) connected to the mold cavity (5).

5. The foaming mold for plastic elastomer according to claim 4, characterized in that: The first air outlet hole (8) and the second air outlet hole (9) are respectively distributed at the middle position and the surrounding positions above the mold cavity (5).

6. A method for foaming a plastic elastomer, characterized in that: The steps include: S1: Foaming masterbatch for making plastic elastomers; S2: Add the foaming masterbatch into the injection molding machine, and melt the foaming masterbatch through the heating barrel of the injection molding machine; S3: injecting the molten mixture into a foaming mold, and under the low pressure in the foaming mold, the molten mixture expands and forms a foam structure; S4: The mixture of the foam structure in the foaming mold solidifies during the cooling process to form a plastic elastomer with a honeycomb structure.

7. The foaming method of a plastic elastomer according to claim 6, characterized in that: In step S3, the molten mixture enters the cavity (5) of the foaming mold from the feed pipe (4) through the feed hole (202) and the feed pipe (203) and from the first feed port (6) and the second feed port (7) respectively for foaming.

8. The foaming method of a plastic elastomer according to claim 6, characterized in that: In the step S1, the raw materials of the foaming masterbatch include the following components in parts by weight: 50-80 parts of masterbatch carrier, 2-15 parts of main foaming agent, 1-4 parts of auxiliary foaming agent, 0.5-1.5 parts of antioxidant, 0.2-1 parts of dewatering agent, 1-3 parts of nucleating agent, 0.5-5 parts of dispersant, and 0.2-2 parts of modifier.

9. The foaming method of a plastic elastomer according to claim 8, characterized in that: The raw materials of the foaming masterbatch include the following components in parts by weight: 65 parts of masterbatch carrier, 8 parts of main foaming agent, 2.5 parts of auxiliary foaming agent, 1 part of antioxidant, 0.6 parts of dewatering agent, 2 parts of nucleating agent, 3 parts of dispersant and 1.2 parts of modifier.

10. The foaming method of plastic elastomer according to claim 8, characterized in that: The preparation process of the foaming masterbatch includes mixing and stirring, banburying processing, single-screw granulation and dehydration packaging.

Images