阅读说明：本技术 一种橡塑绝缘发泡材料及其制备方法 (Rubber-plastic insulating foam material and preparation method thereof ) 是由 周文俊 王永林 谢春竹 于 2021-09-02 设计创作，主要内容包括：本发明提供一种橡塑绝缘发泡材料及其制备方法,涉及发泡材料加工技术领域。所述橡塑绝缘发泡材料由乙烯-醋酸乙烯共聚物、天然橡胶、三元乙丙橡胶、低密度聚乙烯、液态MQ硅树脂、异丁基三乙氧基硅烷、辛基三乙氧基硅烷、氧化石墨烯、聚二烯丙基二甲基氯化铵、碳酸二甲酯、阻燃剂、发泡剂,通过原料复合、原料改性处理、原料混合、原料密炼、发泡成型等步骤制备而成。本发明克服了现有技术的不足,具有良好的绝缘、隔热效果的同时,能够有效抗老化龟裂,提升材料的使用寿命。(The invention provides a rubber-plastic insulating foam material and a preparation method thereof, and relates to the technical field of foam material processing. The rubber-plastic insulating foaming material is prepared from ethylene-vinyl acetate copolymer, natural rubber, ethylene propylene diene monomer, low-density polyethylene, liquid MQ silicon resin, isobutyl triethoxysilane, octyl triethoxysilane, graphene oxide, polydiallyldimethylammonium chloride, dimethyl carbonate, a flame retardant and a foaming agent through the steps of raw material compounding, raw material modification treatment, raw material mixing, raw material banburying, foaming molding and the like. The invention overcomes the defects of the prior art, has good insulating and heat-insulating effects, can effectively resist aging and cracking, and prolongs the service life of the material.)

1. The rubber-plastic insulating foaming material is characterized by being prepared from the following raw materials in parts by weight: 40-60 parts of ethylene-vinyl acetate copolymer, 10-18 parts of natural rubber, 6-10 parts of ethylene propylene diene monomer, 20-25 parts of low-density polyethylene, 4-6 parts of liquid MQ silicon resin, 1-3 parts of isobutyl triethoxysilane, 2-3 parts of octyl triethoxysilane, 1-2 parts of graphene oxide, 1-4 parts of poly (diallyl dimethyl ammonium chloride), 1-3 parts of dimethyl carbonate, 2-3 parts of flame retardant and 2-6 parts of foaming agent.

2. The rubber-plastic insulating foam material according to claim 1, wherein: the flame retardant is a mixture of ammonium polyphosphate, DMMP and decabromodiphenylethane in a mass ratio of 2: 1.

3. The rubber-plastic insulating foam material according to claim 1, wherein: the foaming agent is a mixture of dichlorotetrafluoroethane, fatty alcohol-polyoxyethylene ether sodium sulfate and calcium carbonate in a mass ratio of 1: 3: 1.

4. A preparation method of a rubber-plastic insulating foaming material is characterized by comprising the following steps: the preparation method of the rubber-plastic insulating foaming material comprises the following steps:

(1) compounding raw materials: adding liquid MQ silicon resin into isobutyl triethoxysilane and octyl triethoxysilane, mixing and stirring uniformly to obtain a composite material for later use;

(2) modification treatment of raw materials: mixing ethylene-vinyl acetate copolymer with low-density polyethylene and poly (diallyldimethylammonium chloride), adding graphene oxide, placing in a reaction kettle, heating to 120-150 ℃, and then mechanically stirring at high speed to obtain a modified base material for later use;

(3) mixing raw materials: mixing the foaming agent with the composite material, placing the mixture in a stirring kettle, uniformly stirring, adding dimethyl carbonate, and continuously stirring to obtain a mixture for later use;

(4) banburying of raw materials: adding the modified base stock into natural rubber, ethylene propylene diene monomer rubber and a flame retardant to carry out banburying in a banbury mixer at a multi-section temperature, adding the mixture to carry out banburying continuously for 15-20min, and then extruding and granulating to obtain master batches for later use;

(5) foaming and forming: and placing the master batch in a mold, heating, primarily foaming, then sending into a flat vulcanizing machine for vulcanization foaming treatment, and cooling to obtain the rubber-plastic insulating foaming material.

5. The preparation method of the rubber-plastic insulating foaming material according to claim 4, characterized in that: the mixing and stirring temperature in the step (1) is 55-65 ℃, the stirring speed is 400-600r/min, and the stirring time is 25-35 min.

6. The preparation method of the rubber-plastic insulating foaming material according to claim 4, characterized in that: the rotating speed of the high-speed mechanical stirring in the step (2) is 1200-1600r/min, and the stirring time is 20-30 min.

7. The preparation method of the rubber-plastic insulating foaming material according to claim 4, characterized in that: the stirring speed in the reaction kettle in the step (3) is 500-800r/min, and the temperature in the reaction kettle is 45-55 ℃.

8. The preparation method of the rubber-plastic insulating foaming material according to claim 4, characterized in that: the multi-stage temperature banburying in the step (4) is to banbury for 40-50min at the temperature of 130-.

9. The preparation method of the rubber-plastic insulating foaming material according to claim 4, characterized in that: the temperature of the primary foaming in the step (5) is 170-180 ℃, the foaming time is 2-4min, the steam pressure of the vulcanization foaming treatment is 0.7-0.75MPa, and the vulcanization time is 12-15 min.

Technical Field

The invention relates to the technical field of processing of foam materials, in particular to a rubber-plastic insulating foam material and a preparation method thereof.

Background

The traditional rubber and plastic foaming material has the characteristics of low density, closed bubble mechanism, flex resistance, heat conductivity coefficient, water vapor transmittance, low water absorption rate and the like, is rich in flexibility, convenient to construct and environment-friendly, is widely applied to the field of heat preservation and heat insulation, and is usually applied to heat preservation and heat insulation of various water vapor pipelines in the industries such as central air-conditioning refrigeration machine rooms, buildings, ships, vehicles and the like due to the excellent property of the rubber and plastic material. Can also be processed into fitness equipment, medical appliances, daily necessities handle sleeve, expanding sleeve and the like.

The rubber-plastic foaming material is a high-quality heat-insulating energy-saving material, so that no pollutant harmful to human bodies is generated in installation and application; the insulating material has excellent insulating property, low heat conductivity coefficient and good fireproof performance; because the foam-closed structure is adopted, water in the outside air is difficult to permeate into the material, and the material has excellent water vapor permeation resistance. Generally, the rubber-plastic foaming material is easy to age and accelerate along with the change of temperature when in use, and is easy to crack after long-term use, thereby seriously affecting the use effect of the product and shortening the service life.

Disclosure of Invention

Aiming at the defects of the prior art, the invention provides the rubber-plastic insulating foaming material and the preparation method thereof, which have good insulating and heat-insulating effects, can effectively resist aging and cracking, and prolong the service life of the material.

In order to achieve the above purpose, the technical scheme of the invention is realized by the following technical scheme:

the rubber-plastic insulating foaming material is prepared from the following raw materials in parts by weight: 40-60 parts of ethylene-vinyl acetate copolymer, 10-18 parts of natural rubber, 6-10 parts of ethylene propylene diene monomer, 20-25 parts of low-density polyethylene, 4-6 parts of liquid MQ silicon resin, 1-3 parts of isobutyl triethoxysilane, 2-3 parts of octyl triethoxysilane, 1-2 parts of graphene oxide, 1-4 parts of poly (diallyl dimethyl ammonium chloride), 1-3 parts of dimethyl carbonate, 2-3 parts of flame retardant and 2-6 parts of foaming agent.

Preferably, the flame retardant is a mixture of ammonium polyphosphate, DMMP and decabromodiphenylethane in a mass ratio of 2: 1.

Preferably, the foaming agent is a mixture of dichlorotetrafluoroethane, fatty alcohol-polyoxyethylene ether sodium sulfate and calcium carbonate in a mass ratio of 1: 3: 1.

The preparation method of the rubber-plastic insulating foaming material comprises the following steps:

(1) compounding raw materials: adding liquid MQ silicon resin into isobutyl triethoxysilane and octyl triethoxysilane, mixing and stirring uniformly to obtain a composite material for later use;

(2) modification treatment of raw materials: mixing ethylene-vinyl acetate copolymer with low-density polyethylene and poly (diallyldimethylammonium chloride), adding graphene oxide, placing in a reaction kettle, heating to 120-150 ℃, and then mechanically stirring at high speed to obtain a modified base material for later use;

(3) mixing raw materials: mixing the foaming agent with the composite material, placing the mixture in a stirring kettle, uniformly stirring, adding dimethyl carbonate, and continuously stirring to obtain a mixture for later use;

(4) banburying of raw materials: adding the modified base stock into natural rubber, ethylene propylene diene monomer rubber and a flame retardant to carry out banburying in a banbury mixer at a multi-section temperature, adding the mixture to carry out banburying continuously for 15-20min, and then extruding and granulating to obtain master batches for later use;

(5) foaming and forming: and placing the master batch in a mold, heating, primarily foaming, then sending into a flat vulcanizing machine for vulcanization foaming treatment, and cooling to obtain the rubber-plastic insulating foaming material.

Preferably, the mixing and stirring temperature in the step (1) is 55-65 ℃, the stirring speed is 400-600r/min, and the stirring time is 25-35 min.

Preferably, the rotation speed of the high-speed mechanical stirring in the step (2) is 1200-1600r/min, and the stirring time is 20-30 min.

Preferably, the rotation speed of stirring in the reaction kettle in the step (3) is 500-.

Preferably, the multi-stage temperature banburying in the step (4) is to banbury for 40-50min at the temperature of 130-.

Preferably, the temperature of the primary foaming in the step (5) is 170-180 ℃, the foaming time is 2-4min, the steam pressure of the vulcanization foaming treatment is 0.7-0.75MPa, and the vulcanization time is 12-15 min.

The invention provides a rubber-plastic insulating foaming material and a preparation method thereof, and compared with the prior art, the rubber-plastic insulating foaming material has the advantages that:

(1) according to the application, the MQ silicon resin is mixed with the isobutyl triethoxysilane and the octyl triethoxysilane, so that the anti-aging performance of the raw materials at the later stage is effectively improved, and the uniformity of the raw material mixing is improved;

(2) according to the method, the graphene oxide mixed by the ethylene-vinyl acetate copolymer, the low-density polyethylene and the poly (diallyldimethylammonium chloride) is modified, so that the mechanical property of the raw materials is improved, and the subsequent heat insulation effect is enhanced;

(3) the invention adopts multi-section temperature banburying and secondary foaming, effectively improves the mixing uniformity of the raw materials, improves the stability of the raw materials, and simultaneously ensures the effects of sound insulation, heat insulation, shock resistance, electric insulation, heat resistance, cold resistance and the like of the raw materials.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention are clearly and completely described below in conjunction with the embodiments of the present invention, and it is obvious that the described embodiments are some embodiments of the present invention, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Example 1:

the rubber-plastic insulating foaming material is prepared from the following raw materials in parts by weight: 40 parts of ethylene-vinyl acetate copolymer, 10 parts of natural rubber, 6 parts of ethylene propylene diene monomer, 20 parts of low-density polyethylene, 4 parts of liquid MQ silicon resin, 1 part of isobutyl triethoxysilane, 2 parts of octyl triethoxysilane, 1 part of graphene oxide, 1 part of polydiallyl dimethyl ammonium chloride, 1 part of dimethyl carbonate, 2 parts of flame retardant and 2 parts of foaming agent.

Wherein the flame retardant is a mixture of ammonium polyphosphate, DMMP and decabromodiphenylethane in a mass ratio of 2: 1; the foaming agent is a mixture of dichlorotetrafluoroethane, fatty alcohol-polyoxyethylene ether sodium sulfate and calcium carbonate in a mass ratio of 1: 3: 1.

The preparation method of the rubber-plastic insulating foaming material comprises the following steps:

(1) compounding raw materials: adding liquid MQ silicon resin into isobutyl triethoxysilane and octyl triethoxysilane, mixing and stirring at a rotation speed of 400r/min for 25min at 55 deg.C to obtain composite material;

(2) modification treatment of raw materials: mixing ethylene-vinyl acetate copolymer with low-density polyethylene and poly (diallyldimethylammonium chloride), adding graphene oxide, heating to 120 deg.C in a reaction kettle, mechanically stirring at high speed for 20min at a rotation speed of 1200r/min to obtain modified base material;

(3) mixing raw materials: mixing the foaming agent with the composite material, placing the mixture in a stirring kettle, uniformly stirring at the temperature of 45 ℃ at the rotating speed of 500r/min, adding dimethyl carbonate, and continuously stirring to obtain a mixture for later use;

(4) banburying of raw materials: adding the natural rubber, the ethylene propylene diene monomer rubber and the flame retardant into the modified base material, banburying in an internal mixer at the temperature of 130 ℃ for 40min, then adjusting the temperature to 130 ℃, continuing to banbury for 20min, then adjusting the temperature to 120 ℃, banburying for 50min, then banburying at the temperature of 130 ℃ for 20min, then adding the mixture, continuing to banbury for 15min at the temperature of 120 ℃, extruding and granulating to obtain master batches for later use;

(5) foaming and forming: and placing the master batch in a mold, heating to 170 ℃, primarily foaming for 2min, then sending into a flat vulcanizing machine for vulcanization foaming treatment at the steam pressure of 0.7MPa for 12min, and cooling to obtain the rubber-plastic insulating foaming material.

Example 2:

the rubber-plastic insulating foaming material is prepared from the following raw materials in parts by weight: 60 parts of ethylene-vinyl acetate copolymer, 18 parts of natural rubber, 10 parts of ethylene propylene diene monomer, 25 parts of low-density polyethylene, 6 parts of liquid MQ silicon resin, 3 parts of isobutyl triethoxysilane, 3 parts of octyl triethoxysilane, 2 parts of graphene oxide, 4 parts of poly (diallyl) dimethyl ammonium chloride, 3 parts of dimethyl carbonate, 3 parts of flame retardant and 6 parts of foaming agent.

Wherein the flame retardant is a mixture of ammonium polyphosphate, DMMP and decabromodiphenylethane in a mass ratio of 2: 1; the foaming agent is a mixture of dichlorotetrafluoroethane, fatty alcohol-polyoxyethylene ether sodium sulfate and calcium carbonate in a mass ratio of 1: 3: 1.

The preparation method of the rubber-plastic insulating foaming material comprises the following steps:

(1) compounding raw materials: adding liquid MQ silicon resin into isobutyl triethoxysilane and octyl triethoxysilane, mixing and stirring at 65 deg.C and 600r/min for 35min to obtain composite material;

(2) modification treatment of raw materials: mixing ethylene-vinyl acetate copolymer with low-density polyethylene and poly (diallyldimethylammonium chloride), adding graphene oxide, heating to 150 deg.C in a reaction kettle, and mechanically stirring at high speed for 30min at a rotation speed of 1600r/min to obtain modified base material;

(3) mixing raw materials: mixing the foaming agent with the composite material, placing the mixture in a stirring kettle, uniformly stirring at the temperature of 55 ℃ at the rotating speed of 800r/min, adding dimethyl carbonate, and continuously stirring to obtain a mixture for later use;

(4) banburying of raw materials: adding the natural rubber, the ethylene propylene diene monomer rubber and the flame retardant into the modified base material, carrying out banburying in an internal mixer at the temperature of 140 ℃ for 50min, then adjusting the temperature to 140 ℃, continuing to carry out banburying for 30min, then adjusting the temperature to 130 ℃, carrying out banburying for 80min, then carrying out banburying at the temperature of 150 ℃ for 30min, then adding the mixture, carrying out banburying at the temperature of 130 ℃ for 20min, and then extruding and granulating to obtain master batches for later use;

(5) foaming and forming: placing the master batch in a mold, heating to 180 ℃, primarily foaming for 4min, then sending into a flat vulcanizing machine for vulcanization foaming treatment at the steam pressure of 0.75MPa for 15min, and cooling to obtain the rubber-plastic insulating foaming material.

Example 3:

the rubber-plastic insulating foaming material is prepared from the following raw materials in parts by weight: 50 parts of ethylene-vinyl acetate copolymer, 14 parts of natural rubber, 8 parts of ethylene propylene diene monomer, 23 parts of low-density polyethylene, 5 parts of liquid MQ silicon resin, 2 parts of isobutyl triethoxysilane, 2.5 parts of octyl triethoxysilane, 1.5 parts of graphene oxide, 2 parts of poly (diallyldimethylammonium chloride), 2 parts of dimethyl carbonate, 2.5 parts of flame retardant and 4 parts of foaming agent.

Wherein the flame retardant is a mixture of ammonium polyphosphate, DMMP and decabromodiphenylethane in a mass ratio of 2: 1; the foaming agent is a mixture of dichlorotetrafluoroethane, fatty alcohol-polyoxyethylene ether sodium sulfate and calcium carbonate in a mass ratio of 1: 3: 1.

The preparation method of the rubber-plastic insulating foaming material comprises the following steps:

(1) compounding raw materials: adding liquid MQ silicon resin into isobutyl triethoxysilane and octyl triethoxysilane, mixing and stirring at 60 deg.C and 500r/min for 30min to obtain composite material;

(2) modification treatment of raw materials: mixing ethylene-vinyl acetate copolymer with low-density polyethylene and poly (diallyldimethylammonium chloride), adding graphene oxide, heating to 140 deg.C in a reaction kettle, and mechanically stirring at high speed of 1400r/min for 25min to obtain modified base material;

(3) mixing raw materials: mixing the foaming agent with the composite material, placing the mixture in a stirring kettle, uniformly stirring at the temperature of 50 ℃ at the rotating speed of 650r/min, adding dimethyl carbonate, and continuously stirring to obtain a mixture for later use;

(4) banburying of raw materials: adding the natural rubber, the ethylene propylene diene monomer rubber and the flame retardant into the modified base material, banburying for 45min at the temperature of 135 ℃ in an internal mixer, then adjusting the temperature to 135 ℃, continuing to banbury for 25min, then adjusting the temperature to 125 ℃, banburying for 65min, then banburying for 25min at the temperature of 140 ℃, then adding the mixture, continuing to banbury for 18min at the temperature of 125 ℃, and extruding and granulating to obtain master batches for later use;

(5) foaming and forming: and (3) placing the master batch in a mold, heating to 175 ℃, primarily foaming for 3min, then sending into a flat vulcanizing machine for vulcanization foaming treatment at the steam pressure of 0.75MPa for 13min, and cooling to obtain the rubber-plastic insulating foaming material.

Comparative example 1:

the rubber-plastic insulating foaming material is prepared from the following raw materials in parts by weight: 60 parts of natural rubber, 8 parts of ethylene propylene diene monomer, 23 parts of low-density polyethylene, 5 parts of liquid MQ silicon resin, 2 parts of isobutyl triethoxysilane, 2.5 parts of octyl triethoxysilane, 2 parts of polydiallyl dimethyl ammonium chloride, 2 parts of dimethyl carbonate, 2.5 parts of a flame retardant and 4 parts of a foaming agent.

Wherein the flame retardant is a mixture of ammonium polyphosphate, DMMP and decabromodiphenylethane in a mass ratio of 2: 1; the foaming agent is a mixture of dichlorotetrafluoroethane, fatty alcohol-polyoxyethylene ether sodium sulfate and calcium carbonate in a mass ratio of 1: 3: 1.

The preparation method of the rubber-plastic insulating foaming material comprises the following steps:

(1) compounding raw materials: adding liquid MQ silicon resin into isobutyl triethoxysilane and octyl triethoxysilane, mixing and stirring at 60 deg.C and 500r/min for 30min to obtain composite material;

(2) modification treatment of raw materials: placing low-density polyethylene and polydiallyldimethylammonium chloride in a reaction kettle, heating to 140 ℃, and mechanically stirring at a high speed of 1400r/min for 25min to obtain a base material for later use;

(3) mixing raw materials: mixing the foaming agent with the composite material, placing the mixture in a stirring kettle, uniformly stirring at the temperature of 50 ℃ at the rotating speed of 650r/min, adding dimethyl carbonate, and continuously stirring to obtain a mixture for later use;

(4) banburying of raw materials: adding the natural rubber, the ethylene propylene diene monomer rubber and the flame retardant into the base material, banburying for 45min at the temperature of 135 ℃ in an internal mixer, then adjusting the temperature to 135 ℃, continuing to banbury for 25min, then adjusting the temperature to 125 ℃, banburying for 65min, then banburying for 25min at the temperature of 140 ℃, then adding the mixture, continuing to banbury for 18min at the temperature of 125 ℃, extruding and granulating to obtain master batches for later use;

(5) foaming and forming: and (3) placing the master batch in a mold, heating to 175 ℃, primarily foaming for 3min, then sending into a flat vulcanizing machine for vulcanization foaming treatment at the steam pressure of 0.75MPa for 13min, and cooling to obtain the rubber-plastic insulating foaming material.

Comparative example 2:

the rubber-plastic insulating foaming material is prepared from the following raw materials in parts by weight: 50 parts of ethylene-vinyl acetate copolymer, 14 parts of natural rubber, 8 parts of ethylene propylene diene monomer, 23 parts of low-density polyethylene, 1.5 parts of graphene oxide, 2 parts of poly (diallyldimethylammonium chloride), 2 parts of dimethyl carbonate, 2.5 parts of flame retardant and 4 parts of foaming agent.

Wherein the flame retardant is a mixture of ammonium polyphosphate, DMMP and decabromodiphenylethane in a mass ratio of 2: 1; the foaming agent is a mixture of dichlorotetrafluoroethane, fatty alcohol-polyoxyethylene ether sodium sulfate and calcium carbonate in a mass ratio of 1: 3: 1.

The preparation method of the rubber-plastic insulating foaming material comprises the following steps:

(1) modification treatment of raw materials: mixing ethylene-vinyl acetate copolymer with low-density polyethylene and poly (diallyldimethylammonium chloride), adding graphene oxide, heating to 140 deg.C in a reaction kettle, and mechanically stirring at high speed of 1400r/min for 25min to obtain modified base material;

(2) mixing raw materials: mixing the foaming agent with the composite material, placing the mixture in a stirring kettle, uniformly stirring at the temperature of 50 ℃ at the rotating speed of 650r/min, adding dimethyl carbonate, and continuously stirring to obtain a mixture for later use;

(3) banburying of raw materials: adding the natural rubber, the ethylene propylene diene monomer rubber and the flame retardant into the modified base material, banburying for 45min at the temperature of 135 ℃ in an internal mixer, then adjusting the temperature to 135 ℃, continuing to banbury for 25min, then adjusting the temperature to 125 ℃, banburying for 65min, then banburying for 25min at the temperature of 140 ℃, then adding the mixture, continuing to banbury for 18min at the temperature of 125 ℃, and extruding and granulating to obtain master batches for later use;

(4) foaming and forming: and (3) placing the master batch in a mold, heating to 175 ℃, primarily foaming for 3min, then sending into a flat vulcanizing machine for vulcanization foaming treatment at the steam pressure of 0.75MPa for 13min, and cooling to obtain the rubber-plastic insulating foaming material.

Comparative example 3:

the rubber-plastic insulating foaming material is prepared from the following raw materials in parts by weight: 50 parts of ethylene-vinyl acetate copolymer, 14 parts of natural rubber, 8 parts of ethylene propylene diene monomer, 23 parts of low-density polyethylene, 5 parts of liquid MQ silicon resin, 2 parts of isobutyl triethoxysilane, 2.5 parts of octyl triethoxysilane, 1.5 parts of graphene oxide, 2.5 parts of flame retardant and 4 parts of foaming agent.

Wherein the flame retardant is a mixture of ammonium polyphosphate, DMMP and decabromodiphenylethane in a mass ratio of 2: 1; the foaming agent is a mixture of dichlorotetrafluoroethane, fatty alcohol-polyoxyethylene ether sodium sulfate and calcium carbonate in a mass ratio of 1: 3: 1.

The preparation method of the rubber-plastic insulating foaming material comprises the following steps:

(1) compounding raw materials: adding liquid MQ silicon resin into isobutyl triethoxysilane and octyl triethoxysilane, mixing and stirring at 60 deg.C and 500r/min for 30min to obtain composite material;

(2) modification treatment of raw materials: mixing ethylene-vinyl acetate copolymer with low-density polyethylene, adding graphene oxide, heating to 140 ℃ in a reaction kettle, and mechanically stirring at a high speed for 25min at a rotating speed of 1400r/min to obtain a modified base material for later use;

(3) mixing raw materials: mixing the foaming agent with the composite material, placing the mixture in a stirring kettle, and uniformly stirring at the temperature of 50 ℃ at the rotating speed of 650r/min to obtain a mixture for later use;

(4) banburying of raw materials: adding the natural rubber, the ethylene propylene diene monomer rubber and the flame retardant into the modified base material, banburying for 45min at the temperature of 135 ℃ in an internal mixer, then adjusting the temperature to 135 ℃, continuing to banbury for 25min, then adjusting the temperature to 125 ℃, banburying for 65min, then banburying for 25min at the temperature of 140 ℃, then adding the mixture, continuing to banbury for 18min at the temperature of 125 ℃, and extruding and granulating to obtain master batches for later use;

(5) foaming and forming: and (3) placing the master batch in a mold, heating to 175 ℃, primarily foaming for 3min, then sending into a flat vulcanizing machine for vulcanization foaming treatment at the steam pressure of 0.75MPa for 13min, and cooling to obtain the rubber-plastic insulating foaming material.

And (3) detection:

the specific results of the performance tests performed on the foam materials obtained in examples 1-3 and comparative examples 1-3 are shown in the following table:

as can be seen from the above table, the foam material prepared by the present application has good heat insulation and aging resistance effects.

It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.

The above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.