Green low-smoke foaming rubber and plastic material as well as preparation method and application thereof

Abstract

The invention relates to the technical field of rubber and plastic materials, and particularly discloses a green low-smoke foaming rubber and plastic material as well as a preparation method and application thereof. The green low-smoke foaming rubber and plastic material comprises the following raw material components in parts by mass: 40-50 parts of polyhydroxyalkanoate-butadiene modified ethylene propylene diene monomer, 20-40 parts of polyisoprene rubber, 20-30 parts of waste plastics, 10-20 parts of a foaming agent, 1-7 parts of a cross-linking agent, 5-10 parts of an inorganic filling material, 1-7 parts of a plasticizer, 1-5 parts of an anti-aging agent and 5-15 parts of a vulcanizing agent. The green low-smoke foaming rubber and plastic material is endowed with excellent mechanical property and thermochemical stability by utilizing the synergistic effect of the raw material components, and the problems that the existing foaming rubber and plastic material is poor in foaming effect, so that the rubber material is poor in mechanical property and chemical stability, and the foaming rubber and plastic material is high in smoke yield and is not beneficial to environmental protection are effectively solved.

Description

Technical Field

[0001] The present invention relates to the technical field of rubber and plastic materials, and specifically discloses a green low-smoke foamed rubber and plastic material, a preparation method thereof, and an application thereof. Background Art

[0002] Foamed rubber and plastic refers to a porous material formed by introducing a large number of air bubbles into a rubber and plastic matrix. The presence of these air bubbles endows the rubber and plastic material with unique properties, making it different from ordinary rubber and plastic materials. The foaming process usually generates gas in the rubber and plastic matrix through physical or chemical methods, and these gases form a stable bubble structure during the curing process of the rubber and plastic. As an important polymer material, foamed rubber and plastic materials have many excellent properties such as light weight, good elasticity, sound insulation, heat insulation, and shock absorption, and are widely used in many fields such as industry, construction, transportation, aerospace, and daily life. With the continuous progress of technology and the increasing growth of social demands, the performance requirements for foamed rubber and plastic materials are also getting higher and higher. Therefore, in-depth research on the preparation, performance, and application of foamed rubber and plastic materials has important practical significance.

[0003] With the continuous progress of technology and the continuous expansion of application fields, the new requirements for foamed rubber and plastic materials are getting higher and higher. Especially with the enhancement of people's environmental protection awareness, it promotes the development of foamed rubber and plastic materials towards the direction of green environmental protection. It is not only necessary to reduce the environmental pollution caused by foamed rubber and plastic raw materials, develop non-toxic, harmless, and biodegradable raw materials, but also reduce energy consumption and waste emissions to achieve the sustainable development of foamed rubber and plastic. However, the existing foamed rubber and plastic materials have poor foaming effects, resulting in poor mechanical properties and low chemical stability. More importantly, the existing foamed rubber and plastic materials have a high smoke generation amount, which is not conducive to environmental protection.

[0004] Based on this, it is of great significance to develop a foamed rubber and plastic material with excellent mechanical properties and low smoke generation for the development of foamed rubber and plastic materials. Summary of the Invention

[0005] Aiming at the problems of poor foaming effect of existing foamed rubber and plastic materials, resulting in poor mechanical properties and chemical stability of rubber materials, and large smoke generation amount of foamed rubber and plastic materials, which is not conducive to environmental protection, the present invention provides a green low-smoke foamed rubber and plastic material, a preparation method thereof, and an application thereof. The present invention uses polyhydroxyalkanoate-butadiene modified ethylene propylene diene monomer rubber, polyisoprene rubber, waste plastics, foaming agents, crosslinking agents, inorganic filling materials, plasticizers, anti-aging agents, and vulcanizing agents as main raw materials to prepare a green low-smoke foamed rubber and plastic material with excellent mechanical properties and chemical stability, making up for the deficiencies of the existing technology.

[0006] To achieve the above invention purpose, the present invention provides the following technical solutions: The first aspect of the present invention provides a green low-smoke foamed rubber and plastic material, comprising the following raw material components in parts by mass: 40-50 parts of polyhydroxyalkanoate-butadiene modified ethylene propylene diene monomer rubber, 20-40 parts of polyisoprene rubber, 20-30 parts of waste plastic, 10-20 parts of foaming agent, 1-7 parts of crosslinking agent, 5-10 parts of inorganic filler, 1-7 parts of plasticizer, 1-5 parts of antioxidant and 5-15 parts of vulcanizing agent.

[0007] Polyhydroxyalkanoate has a certain rigidity and strength, and butadiene rubber has good toughness and wear resistance. When they are used to modify ethylene propylene diene monomer rubber, polyhydroxyalkanoate can improve the tensile strength and hardness of the rubber matrix, enabling the foamed rubber and plastic to better withstand external forces during use and being less prone to deformation and damage; butadiene rubber endows the foamed rubber and plastic material with better tear resistance and dynamic mechanical properties, enhancing the durability of the foamed rubber and plastic and enabling it to maintain good performance under repeated stress. Moreover, polyhydroxyalkanoate has good thermal stability, and it can, to a certain extent, increase the thermal decomposition temperature of ethylene propylene diene monomer rubber. This enables the modified foamed rubber and plastic to reduce the performance degradation caused by thermal degradation when used in a high-temperature environment and extend its service life.

[0008] Meanwhile, the addition of polyhydroxyalkanoate and butadiene can affect the nucleation and growth of bubbles during the foaming process. They can act as heterogeneous nucleating agents, increasing the nucleation points of bubbles and forming more fine and uniform bubbles during the foaming process, which helps to improve the mechanical properties, heat insulation properties and sound insulation properties of the foamed rubber and plastic. More importantly, polyhydroxyalkanoate is a biodegradable polymer material. Using it to modify ethylene propylene diene monomer rubber enables the foamed rubber and plastic to gradually degrade in the natural environment after being discarded, reducing environmental pollution.

[0009] In addition, polyhydroxyalkanoate can form a physical barrier structure in the rubber and plastic material. When the rubber and plastic material burns, polyhydroxyalkanoate will gradually form a continuous carbonized layer on the surface of the material. This carbonized layer acts like a protective film with a low thermal conductivity, which can effectively prevent heat from transferring into the material interior, reducing the energy required for further pyrolysis of the rubber and plastic material, thereby reducing the generation amount of pyrolysis products and also reducing the amount of combustible volatiles entering the gas phase to participate in combustion, and thus reducing the smoke generation amount.

[0010] Polyisoprene rubber has high elasticity and relatively low Mooney viscosity, which can endow foamed rubber and plastic with high resilience, good fluidity and plasticity. Moreover, polyisoprene rubber has certain aging resistance, which helps to extend the service life of foamed rubber and plastic materials. In addition, polyisoprene rubber itself does not contain harmful substances and will not release toxic gases or pollutants during production and use, meeting the requirements of green environmental protection. More importantly, polyisoprene rubber will undergo a certain degree of carbonization at high temperatures, forming a carbonized layer. This carbonized layer is like a protective film, covering the surface of the rubber and plastic material, preventing heat and oxygen from further contacting the interior of the material, thereby reducing the degree of thermal decomposition and combustion of the material, and further reducing the smoke generation.

[0011] In summary, the present invention uses polyhydroxyalkanoate-butadiene modified ethylene-propylene-diene monomer rubber and polyisoprene rubber as the rubber matrix, supplemented with auxiliaries such as waste plastics, blowing agents, crosslinking agents, inorganic filler materials, plasticizers, anti-aging agents and vulcanizing agents to prepare a green low-smoke foamed rubber and plastic material. The green low-smoke foamed rubber and plastic material has excellent mechanical properties and chemical stability, and the preparation raw materials are simple and easy to degrade, providing a new idea for the development of foamed rubber and plastic materials.

[0012] Preferably, the preparation method of the polyhydroxyalkanoate-butadiene modified ethylene-propylene-diene monomer rubber comprises the following steps: S1. Mix ethylene-propylene-diene monomer rubber by internal mixing to obtain pretreated ethylene-propylene-diene monomer rubber; S2. Mix the pretreated ethylene-propylene-diene monomer rubber, polyhydroxyalkanoate and butadiene evenly, add auxiliaries, and carry out mixing at 130-145°C, then press and form to obtain the polyhydroxyalkanoate-butadiene modified ethylene-propylene-diene monomer rubber.

[0013] More preferably, in S1, the temperature of the internal mixing is 80-100°C, and the time of the internal mixing is 3-5 min.

[0014] More preferably, in S2, the mass ratio of the pretreated ethylene-propylene-diene monomer rubber, polyhydroxyalkanoate and butadiene is 10:1:2-10:1.5:3.

[0015] More preferably, in S2, the auxiliaries include vulcanizing agents, accelerators, activators and anti-aging agents.

[0016] More preferably, in S2, the addition amount of the auxiliaries is 10%-12% of the mass of the pretreated ethylene-propylene-diene monomer rubber.

[0017] More preferably, in S2, the mixing time is 10-15 min.

[0018] More preferably, the auxiliary agent comprises raw material components with the following mass percentages: vulcanizing agent 25%-45%, accelerator 20%-35%, activator 15%-25% and antioxidant 15%-25%.

[0019] More preferably, the vulcanizing agent is sulfur.

[0020] More preferably, the accelerator is any one of accelerator DM or accelerator CZ.

[0021] More preferably, the activator is stearic acid.

[0022] More preferably, the antioxidant is any one of antioxidant RD or antioxidant MB.

[0023] Preferably, the inorganic filler is mica powder and titanium dioxide with a mass ratio of 1:2 - 1:3.

[0024] Mica powder has good heat resistance, insulation and chemical stability. Adding mica powder to the foamed rubber and plastic material can improve the heat resistance and electrical insulation performance of the rubber material, and at the same time enhance the rigidity and dimensional stability of the material.

[0025] Titanium dioxide can be evenly dispersed in the rubber matrix to play a reinforcing role. When the rubber is stretched or torn by external force, titanium dioxide particles can hinder the expansion of cracks and bear part of the stress, thereby improving the tensile strength and tear strength of the rubber, making the rubber product more durable, able to withstand greater external forces and extending its service life. Moreover, during the mixing process of the rubber and plastic material, titanium dioxide can be evenly dispersed in the rubber and plastic material, reducing the viscosity of the rubber and plastic material, making it easier to process and mold, and improving the quality and performance stability of the rubber and plastic material.

[0026] Preferably, the blowing agent is any one of azodicarbonamide, sodium bicarbonate or citric acid.

[0027] Preferably, the crosslinking agent is dicumyl peroxide.

[0028] Preferably, the plasticizer is citrate.

[0029] Preferably, the antioxidant is any one of antioxidant MB, antioxidant RD or antioxidant D.

[0030] Preferably, the vulcanizing agent is sulfur.

[0031] The second aspect of the present invention provides a preparation method of the green low-smoke foamed rubber and plastic material, comprising the following steps: Step 1: Weigh polyhydroxyalkanoate-butadiene modified ethylene-propylene-diene monomer rubber, polyisoprene rubber, waste plastics, inorganic filler materials, crosslinking agents, and plasticizers according to the designed ratio, and carry out mixing at 150 - 180 °C to obtain a premixed rubber compound. Step 2: Add the said premixed rubber compound to the remaining raw material components, mix evenly, carry out vulcanization and foaming, and molding to obtain the green low-smoke foamed rubber and plastic material.

[0032] Preferably, in Step 1, the mixing time is 20 - 30 min.

[0033] Preferably, in Step 2, vulcanization and foaming are carried out in a segmented vulcanization manner. Among them, the temperature of the first-stage vulcanization and foaming is 125 - 135 °C, and the time of the first-stage vulcanization and foaming is 10 - 15 min; the temperature of the second-stage vulcanization and foaming is 140 - 160 °C, and the time of the second-stage vulcanization and foaming is 5 - 10 min; the temperature of the third-stage vulcanization and foaming is 165 - 180 °C, and the time of the third-stage vulcanization and foaming is 5 - 10 min.

[0034] The third aspect of the present invention provides an application of the said green low-smoke foamed rubber and plastic material or the green low-smoke foamed rubber and plastic material prepared by using the preparation method of the said green low-smoke foamed rubber and plastic material in the field of preparing rubber and plastic products.

[0035] To sum up, the present invention uses polyhydroxyalkanoate-butadiene modified ethylene-propylene-diene monomer rubber and polyisoprene rubber as the rubber matrix, and is supplemented with waste plastics, foaming agents, crosslinking agents, inorganic filler materials, plasticizers, anti-aging agents, vulcanizing agents and other auxiliaries to prepare a green low-smoke foamed rubber and plastic material. The said green low-smoke foamed rubber and plastic material has excellent mechanical properties and chemical stability, and has a low smoke generation amount, effectively solving the problems that the existing foamed rubber and plastic materials have poor foaming effect, resulting in poor mechanical properties and chemical stability of the rubber materials, and the large smoke generation amount of the foamed rubber and plastic materials is not conducive to environmental protection. Specific Embodiments

[0036] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0037] Example 1 This example provides a green low-smoke foamed rubber and plastic material and its preparation method, which specifically includes the following content: The green low-smoke foamed rubber and plastic material comprises the following raw material components in parts by mass: 45 parts of polyhydroxyalkanoate-butadiene modified ethylene-propylene-diene monomer rubber, 30 parts of polyisoprene rubber, 15 parts of azodicarbonamide, 25 parts of waste plastics, 5 parts of dicumyl peroxide, 8 parts of inorganic filler, 5 parts of citrate, 3 parts of antioxidant MB and 10 parts of sulfur; wherein, the inorganic filler is mica powder and titanium dioxide in a mass ratio of 1:2.5.

[0038] The preparation method of the green low-smoke foamed rubber and plastic material comprises the following steps: Step 1: Weigh polyhydroxyalkanoate-butadiene modified ethylene-propylene-diene monomer rubber, polyisoprene rubber, waste plastics, inorganic filler, dicumyl peroxide and citrate according to the designed ratio, and carry out mixing for 25 min at 160 °C to obtain a premixed rubber compound. Step 2: Add the premixed rubber compound to the remaining raw material components, mix evenly, carry out the first-stage vulcanization and foaming for 12 min at 130 °C, raise the temperature to 150 °C for the second-stage vulcanization and foaming for 8 min, then raise the temperature to 175 °C for the third-stage vulcanization and foaming for 8 min, and carry out molding to obtain the green low-smoke foamed rubber and plastic material.

[0039] Wherein, the preparation method of the polyhydroxyalkanoate-butadiene modified ethylene-propylene-diene monomer rubber comprises the following contents: S1: Carry out internal mixing for 5 min at 90 °C on 500 g of ethylene-propylene-diene monomer rubber to obtain pretreated ethylene-propylene-diene monomer rubber. S2: Mix the pretreated ethylene-propylene-diene monomer rubber with 55 g of polyhydroxyalkanoate and 100 g of butadiene evenly, add 40 g of sulfur, 30 g of accelerator DM, 15 g of stearic acid and 15 g of antioxidant RD, carry out mixing for 12 min at 140 °C, and carry out press molding to obtain the polyhydroxyalkanoate-butadiene modified ethylene-propylene-diene monomer rubber.

[0040] Example 2 This example provides a green low-smoke foamed rubber and plastic material and its preparation method, which specifically comprises the following contents: The green low-smoke foamed rubber and plastic material comprises the following raw material components in parts by mass: 50 parts of polyhydroxyalkanoate-butadiene modified ethylene-propylene-diene monomer rubber, 40 parts of polyisoprene rubber, 15 parts of sodium bicarbonate, 20 parts of waste plastics, 5 parts of dicumyl peroxide, 8 parts of inorganic filler, 5 parts of citrate, 3 parts of antioxidant MB and 10 parts of sulfur; wherein, the inorganic filler is mica powder and titanium dioxide in a mass ratio of 1:2.

[0041] The preparation method of the green low-smoke foamed rubber and plastic material comprises the following steps: Step 1: Weigh polyhydroxyalkanoate-butadiene modified ethylene propylene diene monomer rubber (EPDM), polyisoprene rubber, waste plastics, inorganic filler, dicumyl peroxide and citric acid ester according to the designed ratio, and carry out mixing for 25 min at 160 °C to obtain a premixed rubber compound; Step 2: Add the premixed rubber compound to the remaining raw material components, mix evenly, carry out the first-stage vulcanization and foaming for 10 min at 135 °C, raise the temperature to 160 °C for the second-stage vulcanization and foaming for 5 min, and then raise the temperature to 180 °C for the third-stage vulcanization and foaming for 5 min, and carry out molding to obtain the green low-smoke foamed rubber and plastic material.

[0042] Among them, the preparation method of the polyhydroxyalkanoate-butadiene modified EPDM rubber includes the following contents: S1: Carry out internal mixing for 5 min at 90 °C on 500 g of EPDM rubber to obtain pretreated EPDM rubber; S2: Mix the pretreated EPDM rubber with 55 g of polyhydroxyalkanoate and 100 g of butadiene evenly, add 40 g of sulfur, 30 g of accelerator DM, 15 g of stearic acid and 15 g of antioxidant RD, carry out mixing for 12 min at 140 °C, and carry out press molding to obtain the polyhydroxyalkanoate-butadiene modified EPDM rubber.

[0043] Example 3 This example provides a green low-smoke foamed rubber and plastic material and its preparation method, which specifically includes the following contents: The green low-smoke foamed rubber and plastic material includes the following raw material components in parts by mass: 50 parts of polyhydroxyalkanoate-butadiene modified EPDM rubber, 20 parts of polyisoprene rubber, 10 parts of azodicarbonamide, 30 parts of waste plastics, 7 parts of dicumyl peroxide, 10 parts of inorganic filler, 4 parts of citric acid ester, 3 parts of antioxidant MB and 12 parts of sulfur; among them, the inorganic filler is mica powder and titanium dioxide with a mass ratio of 1:3.

[0044] The preparation method of the green low-smoke foamed rubber and plastic material includes the following steps: Step 1: Weigh polyhydroxyalkanoate-butadiene modified EPDM rubber, polyisoprene rubber, waste plastics, inorganic filler, dicumyl peroxide and citric acid ester according to the designed ratio, and carry out mixing for 25 min at 160 °C to obtain a premixed rubber compound; Step 2: Add the premixed rubber compound to the remaining raw material components, mix evenly, carry out the first-stage vulcanization and foaming for 15 min at 125 °C, raise the temperature to 140 °C for the second-stage vulcanization and foaming for 10 min, and then raise the temperature to 165 °C for the third-stage vulcanization and foaming for 10 min, and carry out molding to obtain the green low-smoke foamed rubber and plastic material.

[0045] Among them, the preparation method of the polyhydroxyalkanoate-butadiene modified ethylene-propylene-diene monomer rubber includes the following: S1. Knead 500 g of ethylene-propylene-diene monomer rubber at 90 °C for 5 min to obtain pretreated ethylene-propylene-diene monomer rubber; S2. Mix the pretreated ethylene-propylene-diene monomer rubber with 55 g of polyhydroxyalkanoate and 100 g of butadiene evenly, add 40 g of sulfur, 30 g of accelerator CZ, 15 g of stearic acid and 15 g of antioxidant MB, and knead at 135 °C for 15 min, then press and mold to obtain the polyhydroxyalkanoate-butadiene modified ethylene-propylene-diene monomer rubber.

[0046] Comparative Example 1 This comparative example provides a green low-smoke foamed rubber and plastic material and its preparation method. The difference from Example 1 is that the polyhydroxyalkanoate-butadiene modified ethylene-propylene-diene monomer rubber is replaced with an equal amount of polyhydroxyalkanoate modified ethylene-propylene-diene monomer rubber, which specifically includes the following: The green low-smoke foamed rubber and plastic material includes the following raw material components in parts by mass: 45 parts of polyhydroxyalkanoate modified ethylene-propylene-diene monomer rubber, 30 parts of polyisoprene rubber, 25 parts of waste plastic, 15 parts of azodicarbonamide, 5 parts of dicumyl peroxide, 8 parts of inorganic filler, 5 parts of citrate, 3 parts of antioxidant MB and 10 parts of sulfur; among them, the inorganic filler is mica powder and titanium dioxide with a mass ratio of 1:2.5.

[0047] The preparation method of the green low-smoke foamed rubber and plastic material includes the following steps: Step 1. Weigh polyhydroxyalkanoate modified ethylene-propylene-diene monomer rubber, polyisoprene rubber, waste plastic, inorganic filler, dicumyl peroxide and citrate according to the designed ratio, and knead at 160 °C for 25 min to obtain a premixed rubber compound; Step 2. Add the premixed rubber compound to the remaining raw material components, mix evenly, conduct the first-stage vulcanization and foaming at 130 °C for 12 min, raise the temperature to 150 °C for the second-stage vulcanization and foaming for 8 min, and then raise the temperature to 175 °C for the third-stage vulcanization and foaming for 8 min, and then mold to obtain the green low-smoke foamed rubber and plastic material.

[0048] Among them, the preparation method of the polyhydroxyalkanoate modified ethylene-propylene-diene monomer rubber includes the following: S1. Knead 500 g of ethylene-propylene-diene monomer rubber at 90 °C for 5 min to obtain pretreated ethylene-propylene-diene monomer rubber; S2. Mix the pretreated ethylene-propylene-diene monomer rubber with 55 g of polyhydroxyalkanoate evenly, add 40 g of sulfur, 30 g of accelerator DM, 15 g of stearic acid and 15 g of antioxidant RD, and knead at 140 °C for 12 min, then press and mold to obtain the polyhydroxyalkanoate modified ethylene-propylene-diene monomer rubber.

[0049] Comparative Example 2 This comparative example provides a green low-smoke foamed rubber and plastic material and its preparation method. The difference from Example 1 is that the polyhydroxyalkanoate-butadiene modified ethylene-propylene-diene monomer rubber is replaced with an equal amount of butadiene modified ethylene-propylene-diene monomer rubber, and the specific content is as follows: The green low-smoke foamed rubber and plastic material comprises the following raw material components in parts by mass: 45 parts of butadiene modified ethylene-propylene-diene monomer rubber, 30 parts of polyisoprene rubber, 25 parts of waste plastic, 15 parts of azodicarbonamide, 5 parts of dicumyl peroxide, 8 parts of inorganic filler, 5 parts of citrate, 3 parts of antioxidant MB and 10 parts of sulfur; wherein, the inorganic filler is mica powder and titanium dioxide with a mass ratio of 1:2.5.

[0050] The preparation method of the green low-smoke foamed rubber and plastic material comprises the following steps: Step 1: Weigh butadiene modified ethylene-propylene-diene monomer rubber, polyisoprene rubber, waste plastic, inorganic filler, dicumyl peroxide and citrate according to the designed ratio, and carry out mixing for 25 min at 160 °C to obtain a premixed rubber compound; Step 2: Add the premixed rubber compound to the remaining raw material components, mix evenly, carry out the first-stage vulcanization and foaming for 12 min at 130 °C, raise the temperature to 150 °C for the second-stage vulcanization and foaming for 8 min, and then raise the temperature to 175 °C for the third-stage vulcanization and foaming for 8 min, and carry out molding to obtain the green low-smoke foamed rubber and plastic material.

[0051] Among them, the preparation method of the butadiene modified ethylene-propylene-diene monomer rubber comprises the following content: S1: Carry out internal mixing for 5 min at 90 °C on 500 g of ethylene-propylene-diene monomer rubber to obtain pretreated ethylene-propylene-diene monomer rubber; S2: Mix the pretreated ethylene-propylene-diene monomer rubber and 100 g of butadiene evenly, add 40 g of sulfur, 30 g of accelerator DM, 15 g of stearic acid and 15 g of antioxidant RD, carry out mixing for 12 min at 140 °C, and carry out pressing and molding to obtain the butadiene modified ethylene-propylene-diene monomer rubber.

[0052] Comparative Example 3 This comparative example provides a green low-smoke foamed rubber and plastic material and its preparation method. The difference from Example 1 is that the polyisoprene rubber is replaced with an equal amount of polybutadiene rubber, and the specific content is as follows: The green low-smoke foamed rubber and plastic material comprises the following raw material components in parts by mass: 45 parts of polyhydroxyalkanoate-butadiene modified ethylene-propylene-diene monomer rubber, 30 parts of polybutadiene rubber, 25 parts of waste plastic, 15 parts of azodicarbonamide, 5 parts of dicumyl peroxide, 8 parts of inorganic filler, 5 parts of citrate, 3 parts of antioxidant MB and 10 parts of sulfur; wherein, the inorganic filler is mica powder and titanium dioxide in a mass ratio of 1:2.5.

[0053] The preparation method of the green low-smoke foamed rubber and plastic material comprises the following steps: Step 1: Weigh polyhydroxyalkanoate-butadiene modified ethylene-propylene-diene monomer rubber, polybutadiene rubber, waste plastic, inorganic filler, dicumyl peroxide and citrate according to the designed ratio, and carry out mixing for 25 min at 160 °C to obtain a premixed rubber compound. Step 2: Add the premixed rubber compound to the remaining raw material components, mix evenly, carry out the first-stage vulcanization and foaming for 12 min at 130 °C, raise the temperature to 150 °C for the second-stage vulcanization and foaming for 8 min, and then raise the temperature to 175 °C for the third-stage vulcanization and foaming for 8 min, and carry out molding to obtain the green low-smoke foamed rubber and plastic material.

[0054] Wherein, the preparation method of the polyhydroxyalkanoate-butadiene modified ethylene-propylene-diene monomer rubber comprises the following contents: S1: Carry out internal mixing on 500 g of ethylene-propylene-diene monomer rubber at 90 °C for 5 min to obtain pretreated ethylene-propylene-diene monomer rubber. S2: Mix the pretreated ethylene-propylene-diene monomer rubber with 55 g of polyhydroxyalkanoate and 100 g of butadiene evenly, add 40 g of sulfur, 30 g of accelerator DM, 15 g of stearic acid and 15 g of antioxidant RD, carry out mixing for 12 min at 140 °C, and carry out pressing and molding to obtain the polyhydroxyalkanoate-butadiene modified ethylene-propylene-diene monomer rubber.

[0055] In order to further reflect the technical effects of the present invention, the present invention carried out relevant performance tests on the green low-smoke foamed rubber and plastic materials obtained in Examples 1-3 and Comparative Examples 1-3. The tensile strength and elongation at break were tested with reference to the national standard GB / T 528-2009; the elasticity test was carried out in accordance with GB / T 10652-2001; a 2-mm fluororubber sheet was irradiated with a heat flux of 600 kw / m 2 for 40 s, and then the temperature rise on the back of the rubber sheet was measured; the present invention also carried out a smoke generation amount test on the green low-smoke foamed rubber and plastic materials obtained in Examples 1-3 and Comparative Examples 1-3: the smoke density was tested according to GB / T8627-2007, and the specific test results are shown in Table 1.

[0056] Table 1 Performance test results of the green low-smoke foamed rubber and plastic materials obtained in each example and comparative example

[0057] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.

Claims

1. A green low-smoke foamed rubber-plastic material, characterized by: The invention comprises the following raw material components in parts by weight: 40-50 parts of polyhydroxyalkanoate-butadiene modified ethylene propylene rubber, 20-40 parts of polyisoprene rubber, 20-30 parts of waste plastics, 10-20 parts of foaming agent, 1-7 parts of crosslinking agent, 5-10 parts of inorganic filling material, 1-7 parts of plasticizer, 1-5 parts of antioxidant and 5-15 parts of vulcanizing agent.

2. The green low-smoke foamed rubber-plastic material according to claim 1, characterized in that: The preparation method of the polyhydroxyalkanoate-butadiene modified ethylene propylene diene monomer rubber comprises the following steps: S1, mixing the EPDM rubber to obtain pretreated EPDM rubber; S2, uniformly mixing the pretreated EPDM rubber, polyhydroxyalkanoate and butadiene, adding an auxiliary agent, kneading at 130-145° C., and pressing to form the polyhydroxyalkanoate-butadiene modified EPDM rubber.

3. The green low-smoke foamed rubber-plastic material according to claim 2, characterized in that: In S1, the banburying temperature is 80-100° C., and the banburying time is 3-5 min.

4. The green low-smoke foamed rubber-plastic material according to claim 2, characterized in that: In S2, the mass ratio of the pretreated EPDM rubber, polyhydroxyalkanoate and butadiene is 10:1:2-10:1.5:3; and / or In S2, the auxiliary agent includes a vulcanizing agent, an accelerator, an activator and an antioxidant; and / or In S2, the amount of the additive added is 10%-12% of the mass of the pretreated EPDM rubber; and / or In S2, the mixing time is 10-15 minutes.

5. The green low-smoke foamed rubber-plastic material according to claim 4, characterized in that: The auxiliary agent comprises the following raw material components in percentage by weight: 25%-45% of a vulcanizing agent, 20%-35% of an accelerator, 15%-25% of an activator and 20%-25% of an antioxidant.

6. The green low-smoke foamed rubber-plastic material according to claim 1, characterized in that: The inorganic filling material is mica powder and titanium dioxide in a mass ratio of 1:2-1:3; and / or The foaming agent is any one of azodicarbonamide, sodium bicarbonate or citric acid; and / or The cross-linking agent is dicumyl peroxide.

7. The green low-smoke foamed rubber-plastic material according to claim 1, characterized in that: The plasticizer is a citrate; and / or The antioxidant is any one of antioxidant MB, antioxidant RD or antioxidant D; and / or The vulcanizing agent is sulfur.

8. The method for preparing the green low-smoke foamed rubber-plastic material according to any one of claims 1 to 7, characterized in that: The steps include: Step 1: weigh polyhydroxyalkanoate-butadiene modified ethylene propylene diene rubber, polyisoprene rubber, inorganic filler, crosslinking agent and plasticizer according to the designed ratio, and mix them at 150-180° C. to obtain a premixed rubber; Step 2: adding the premixed rubber material to the remaining raw material components, mixing evenly, vulcanizing and foaming, and molding to obtain the green low-smoke foamed rubber and plastic material.

9. The method for preparing the green low-smoke foamed rubber-plastic material according to claim 8, characterized in that: In step 1, the mixing time is 20-30 min; and / or In step 2, vulcanization and foaming are carried out by staged vulcanization, wherein the temperature of the first stage vulcanization and foaming is 125-135°C, and the time of the first stage vulcanization and foaming is 10-15min; the temperature of the second stage vulcanization and foaming is 140-160°C, and the time of the second stage vulcanization and foaming is 5-10min; the temperature of the third stage vulcanization and foaming is 165-180°C, and the time of the third stage vulcanization and foaming is 5-10min.

10. Use of the green low-smoke foamed rubber and plastic material as claimed in any one of claims 1 to 7 or the green low-smoke foamed rubber and plastic material prepared by the preparation method of the green low-smoke foamed rubber and plastic material as claimed in claim 8 or 9 in the field of preparing rubber and plastic products.

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