Flame-retardant foaming material and preparation method thereof

Abstract

The invention discloses a flame-retardant foaming material and a preparation method thereof. Comprising the following raw materials in parts by weight: 25-35 parts of nitrile rubber, 50-60 parts of polyvinyl chloride, 140-180 parts of a flame retardant, 30-40 parts of a foaming agent, 1-2 parts of butadiene rubber, 1-3 parts of carbon black, 4-6 parts of paraffin, 60-70 parts of chlorinated paraffin oil, 2-3 parts of a lubricant, 1-3 parts of epoxidized soybean oil, 0.6-1.0 part of an antioxidant, 2-5 parts of an accelerant, 0.3-0.6 part of zinc oxide and 0.4-0.8 part of a vulcanizing agent. The foaming material disclosed by the invention takes nitrile rubber, polyvinyl chloride and the flame retardant as main materials, is high in safety level and can be used for efficiently retarding flame.

Description

Technical Field

[0001] The invention belongs to the technical field of foam material preparation, and particularly relates to a flame retardant foam material and a preparation method thereof. Background Art

[0002] Rubber-plastic foam materials are polymer materials with a porous structure formed from a rubber or plastic matrix through physical, chemical, or mechanical foaming processes. Their unique cellular structure imparts excellent properties such as lightweight, thermal insulation, sound absorption, and cushioning, making them widely used in construction, automotive, packaging, and sports equipment. Common plastic-based foam materials include PE (polyethylene), PU (polyurethane), and PVC (polyvinyl chloride), while rubber-based foam materials include NBR (nitrile butadiene rubber) and EPDM (ethylene propylene diene monomer). By adjusting the formulation and process, different densities, hardnesses, and functional properties can be customized to meet diverse needs.

[0003] Rubber and plastic foam materials have many advantages: 1. Lightweight: low density (as low as 0.01g / cm 3 ), significantly reducing product weight, suitable for automotive, aerospace and other fields. 2. Excellent thermal insulation and sound insulation performance: closed-cell structure (such as XPS, PU rigid foam) has low thermal conductivity and is an ideal material for building insulation; open-cell structure (such as PU soft foam) has outstanding sound absorption effect. 3. Excellent cushioning and shock resistance: elastic foam cells can effectively absorb impact energy and are widely used in precision instrument packaging, sports protective gear, etc. 4. Chemical resistance and weather resistance: rubber-based foam materials (such as EPDM, NBR) are oil-resistant and aging-resistant, and are suitable for harsh environments. 5. Strong machinability: It can be formed through molding, extrusion, injection and other processes to meet complex shape requirements. 6. High cost-effectiveness: the raw materials of some materials (such as EPS, EPE) are easy to obtain, the production process is mature, and the cost-effectiveness is outstanding.

[0004] Rubber-plastic foam materials have low mechanical strength. Compared with solid materials, the foamed structure is easily deformed under pressure and needs to be improved through composite reinforcement (such as adding fibers). High-temperature resistance is limited. Most materials are used at temperatures below 120°C for a long time. They are easily softened or decomposed at high temperatures (such as PE and EPS) and are not fire-resistant. The uniformity of the foam cells is affected by factors such as the foaming agent, temperature, and pressure, and the yield rate must be strictly controlled. Durability challenges: Open-cell structures are prone to water absorption (such as EVA), and long-term use may lead to performance degradation. Summary of the Invention

[0005] The object of the present invention is to provide a flame retardant foam material and a preparation method thereof.

[0006] A flame retardant foaming material comprises the following raw materials in parts by weight: 25-35 parts of nitrile rubber, 50-60 parts of polyvinyl chloride, 140-180 parts of a flame retardant, 30-40 parts of a foaming agent, 1-2 parts of butadiene rubber, 1-3 parts of carbon black, 4-6 parts of paraffin wax, 60-70 parts of chlorinated paraffin oil, 2-3 parts of a lubricant, 1-3 parts of epoxidized soybean oil, 0.6-1.0 parts of an antioxidant, 2-5 parts of an accelerator, 0.3-0.6 parts of zinc oxide, and 0.4-0.8 parts of a vulcanizing agent.

[0007] The flame retardant includes the following components in parts by weight: 120 parts of aluminum hydroxide, 30 parts of decabromodiphenylethane, and 10 parts of antimony trioxide.

[0008] The flame retardant comprises the following components in parts by weight: 120 parts of aluminum hydroxide, 20 parts of 2-carboxyethylphenylphosphinic acid, and 10 parts of tetrabromobisphenol A bisallyl ether.

[0009] The foaming agent is one or more of azodicarbonamide, benzenesulfonylhydrazide, p-toluenesulfonylhydrazide and sodium bicarbonate.

[0010] The lubricant is one or more of stearic acid, zinc stearate, and 2-(pentaerythritol triisooctanoate) adipate.

[0011] The antioxidant is a mixture of Cyanox 1790 (1,3,5-tris(4-tert-butyl-3-hydroxy-2,6-dimethylbenzyl)-1,3,5-triazine-2,4,6-(1H,3H,5H)-trione) and antioxidant 300 (4,4'-thiobis(6-tert-butyl-3-methylphenol)) in a mass ratio of 1:2.

[0012] The accelerator includes the following components in parts by weight: 2.3 parts of accelerator PZ, 0.45 parts of accelerator ZBS, and 0.45 parts of accelerator DPTT.

[0013] The vulcanizing agent is one or more of tetramethylthiuram disulfide, morpholine disulfide, dicumyl peroxide, benzoyl peroxide, and hexamethylenediamine.

[0014] The preparation method of the flame retardant foam material is carried out according to the following steps:

[0015] (1) According to the weight ratio, 25-35 parts of nitrile rubber, 50-60 parts of polyvinyl chloride, 140-180 parts of flame retardant, 30-40 parts of foaming agent, 1-2 parts of butadiene rubber, 1-3 parts of carbon black, 4-6 parts of paraffin, 60-70 parts of chlorinated paraffin oil, 2-3 parts of lubricant, 1-3 parts of epoxidized soybean oil, 0.6-1.0 parts of antioxidant, and 0.3-0.6 parts of zinc oxide are added to an internal mixer and mixed at 140-180°C for 10-15 minutes;

[0016] (2) adding 2-5 parts of accelerator and 0.4-0.8 parts of vulcanizing agent to the material prepared in step (1), sending the mixture into an open mill for 5-10 minutes, cooling the mixture to room temperature, and sending the mixture into an extruder for extrusion molding;

[0017] (3) placing the molding material prepared in step (2) in an oven for continuous vulcanization and foaming;

[0018] (4) The molded foam material prepared in step (3) is cooled to room temperature, cut into finished foam materials with a length of 2-10 m, and then packaged and stored.

[0019] The head temperature of the extruder in step (2) is set to 40-60°C; the baking oven in step (3) is divided into 7 vulcanization temperature zones: zone 1 100-110°C, feeding speed 1.0-1.5 m / min; zone 2 110-120°C, feeding speed 1.5-2.0 m / min; zone 3 120-130°C, feeding speed 2.5-3.0 m / min; zone 4 130-140°C, feeding speed 3.5-4.0 m / min; zone 5 150-160°C, feeding speed 4.5-5.5 m / min; zone 6 160-170°C, feeding speed 6.5-7.5 m / min; zone 7 165-175°C, feeding speed 7.5-8.0 m / min.

[0020] The present invention has the following beneficial effects: The foam material, which comprises nitrile rubber, polyvinyl chloride, and a flame retardant as its main ingredients, has a high safety level and is highly flame-retardant. The flame retardant comprises a combination of 2-carboxyethylphenylphosphinic acid and tetrabromobisphenol A bisallyl ether, which enhances the material's flame retardancy. The antioxidant comprises a combination of Cyanox 1790 and Antioxidant 300, which enhances the material's aging resistance. DETAILED DESCRIPTION

[0021] To facilitate understanding of the present invention, the present invention will be described more fully below. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the understanding of the disclosure of the present invention more thorough and comprehensive.

[0022] Example 1

[0023] A flame-retardant foaming material comprises the following raw materials in parts by weight: 30 parts of nitrile rubber, 55 parts of polyvinyl chloride, 150 parts of a flame retardant, 35 parts of azodicarbonamide, 1.5 parts of butadiene rubber, 2 parts of carbon black, 5 parts of paraffin, 65 parts of chlorinated paraffin oil, 2.5 parts of stearic acid, 2 parts of epoxidized soybean oil, 0.8 parts of antioxidant, 3.2 parts of accelerator, 0.5 parts of zinc oxide, and 0.6 parts of tetramethylthiuram disulfide; the flame retardant comprises the following components in parts by weight: 120 parts of aluminum hydroxide, 20 parts of 2-carboxyethylphenylphosphinic acid, and 10 parts of tetrabromobisphenol A bisallyl ether; the antioxidant is a mixture of Cyanox 1790 and antioxidant 300 in a mass ratio of 1:2; and the accelerator comprises the following components in parts by weight: 2.3 parts of accelerator PZ, 0.45 parts of accelerator ZBS, and 0.45 parts of accelerator DPTT.

[0024] The preparation method of the flame retardant foam material is carried out according to the following steps:

[0025] (1) According to the weight ratio, 30 parts of nitrile rubber, 55 parts of polyvinyl chloride, 160 parts of flame retardant, 35 parts of azodicarbonamide, 1.5 parts of butadiene rubber, 2 parts of carbon black, 5 parts of paraffin, 65 parts of chlorinated paraffin oil, 2.5 parts of stearic acid, 2 parts of epoxidized soybean oil, 0.8 parts of antioxidant, and 0.5 parts of zinc oxide were added to an internal mixer and mixed at 160°C for 12 minutes;

[0026] (2) adding 3.2 parts of accelerator and 0.6 parts of tetramethylthiuram disulfide to the material prepared in step (1), sending the mixture into an open mill and refining for 8 minutes, cooling the mixture to room temperature, and sending the mixture into an extruder for extrusion molding; the head temperature of the extruder was set at 50°C;

[0027] (3) placing the molding material prepared in step (2) in an oven for continuous vulcanization and foaming; the oven is divided into 7 vulcanization temperature zones: zone 1 105°C, feeding speed 1.2 m / min; zone 2 115°C, feeding speed 1.8 m / min; zone 3 125°C, feeding speed 2.8 m / min; zone 4 135°C, feeding speed 3.8 m / min; zone 5 155°C, feeding speed 5 m / min; zone 6 165°C, feeding speed 7 m / min; zone 7 170°C, feeding speed 7.8 m / min;

[0028] (4) The molded foam material prepared in step (3) is cooled to room temperature, cut into finished foam materials with a length of 6 m, and then packaged and stored.

[0029] Example 2

[0030] A flame-retardant foaming material comprises the following raw materials in parts by weight: 25 parts of nitrile rubber, 50 parts of polyvinyl chloride, 150 parts of a flame retardant, 30 parts of benzenesulfonyl hydrazide, 1 part of butadiene rubber, 1 part of carbon black, 4 parts of paraffin, 60 parts of chlorinated paraffin oil, 2 parts of zinc stearate, 1 part of epoxidized soybean oil, 0.6 parts of an antioxidant, 2.5 parts of an accelerator, 0.3 parts of zinc oxide, and 0.4 parts of dicumyl peroxide; the antioxidant is a mixture of Cyanox 1790 and antioxidant 300 in a mass ratio of 1:2; the flame retardant comprises the following components in parts by weight: 110 parts of aluminum hydroxide, 30 parts of decabromodiphenylethane, and 10 parts of antimony trioxide; and the accelerator comprises the following components in parts by weight: 2 parts of accelerator PZ, 0.25 parts of accelerator ZBS, and 0.25 parts of accelerator DPTT.

[0031] The preparation method of the flame retardant foam material is carried out according to the following steps:

[0032] (1) According to the weight ratio, 25 parts of nitrile rubber, 50 parts of polyvinyl chloride, 150 parts of flame retardant, 30 parts of benzenesulfonyl hydrazide, 1 part of butadiene rubber, 1 part of carbon black, 4 parts of paraffin, 60 parts of chlorinated paraffin oil, 2 parts of zinc stearate, 1 part of epoxy soybean oil, 0.6 parts of antioxidant, and 0.3 parts of zinc oxide were added to an internal mixer and mixed at 150°C for 15 minutes;

[0033] (2) adding 2.5 parts of accelerator and 0.4 parts of dicumyl peroxide to the material prepared in step (1), sending the mixture into an open mill and refining for 6 minutes, cooling the mixture to room temperature, and sending the mixture into an extruder for extrusion molding; the head temperature of the extruder was set at 45°C;

[0034] (3) placing the molding material prepared in step (2) in an oven for continuous vulcanization and foaming; the oven is divided into 7 vulcanization temperature zones: zone 1 100°C, feeding speed 1.0 m / min; zone 2 110°C, feeding speed 1.5 m / min; zone 3 120°C, feeding speed 2.5 m / min; zone 4 130°C, feeding speed 3.5 m / min; zone 5 150°C, feeding speed 4.5 m / min; zone 6 160°C, feeding speed 6.5 m / min; zone 7 165°C, feeding speed 7.5 m / min;

[0035] (4) The molded foam material prepared in step (3) is cooled to room temperature, cut into finished foam materials with a length of 3 m, and then packaged and stored.

[0036] Example 3

[0037] A flame-retardant foaming material comprises the following raw materials in parts by weight: 35 parts of nitrile rubber, 60 parts of polyvinyl chloride, 180 parts of a flame retardant, 40 parts of sodium bicarbonate, 2 parts of butadiene rubber, 3 parts of carbon black, 6 parts of paraffin wax, 70 parts of chlorinated paraffin oil, 3 parts of 2-(pentaerythritol triisooctanoate) adipate, 3 parts of epoxidized soybean oil, 1.0 part of an antioxidant, 5 parts of an accelerator, 0.6 parts of zinc oxide, and 0.8 parts of morpholine disulfide; the flame retardant is a mixture of 2-carboxyethylphenylphosphinic acid and tetrabromobisphenol A bisallyl ether in a mass ratio of 2:1; the antioxidant is a mixture of Cyanox 1790 and antioxidant 300 in a mass ratio of 1:2; and the accelerator comprises the following components in parts by weight: 3 parts of accelerator PZ, 1 part of accelerator ZBS, and 1 part of accelerator DPTT.

[0038] The preparation method of the flame retardant foam material is carried out according to the following steps:

[0039] (1) According to the weight ratio, 35 parts of nitrile rubber, 60 parts of polyvinyl chloride, 180 parts of flame retardant, 40 parts of sodium bicarbonate, 2 parts of butadiene rubber, 3 parts of carbon black, 6 parts of paraffin, 70 parts of chlorinated paraffin oil, 3 parts of 2-(pentaerythritol triisooctanoate) adipate, 3 parts of epoxidized soybean oil, 1.0 part of antioxidant, and 0.6 part of zinc oxide were added to an internal mixer and mixed at 180°C for 10 minutes;

[0040] (2) adding 5 parts of accelerator and 0.8 parts of morpholine disulfide to the material prepared in step (1), sending the mixture into an open mill and refining for 10 minutes, cooling the mixture to room temperature, and sending the mixture into an extruder for extrusion molding; the head temperature of the extruder was set at 60°C;

[0041] (3) placing the molding material prepared in step (2) in an oven for continuous vulcanization and foaming; the oven is divided into 7 vulcanization temperature zones: zone 1 110°C, feeding speed 1.5 m / min; zone 2 120°C, feeding speed 2.0 m / min; zone 3 130°C, feeding speed 3.0 m / min; zone 4 140°C, feeding speed 4.0 m / min; zone 5 160°C, feeding speed 5.5 m / min; zone 6 170°C, feeding speed 7.5 m / min; zone 7 175°C, feeding speed 8.0 m / min;

[0042] (4) The molded foam material prepared in step (3) is cooled to room temperature, cut into finished foam materials with a length of 2-10 m, and then packaged and stored.

[0043] Comparative Example 1

[0044] A flame-retardant foaming material comprises the following raw materials in parts by weight: 30 parts of nitrile rubber, 55 parts of polyvinyl chloride, 150 parts of a flame retardant, 35 parts of azodicarbonamide, 1.5 parts of butadiene rubber, 2 parts of carbon black, 5 parts of paraffin, 65 parts of chlorinated paraffin oil, 2.5 parts of stearic acid, 2 parts of epoxidized soybean oil, 0.8 parts of antioxidant, 3.2 parts of accelerator, 0.5 parts of zinc oxide, and 0.6 parts of tetramethylthiuram disulfide; the flame retardant comprises the following components in parts by weight: 120 parts of aluminum hydroxide and 30 parts of 2-carboxyethylphenylphosphinic acid; the antioxidant is a mixture of Cyanox 1790 and antioxidant 300 in a mass ratio of 1:2; and the accelerator comprises the following components in parts by weight: 2.3 parts of accelerator PZ, 0.45 parts of accelerator ZBS, and 0.45 parts of accelerator DPTT.

[0045] The preparation method of the flame retardant foam material is carried out according to the following steps:

[0046] (1) According to the weight ratio, 30 parts of nitrile rubber, 55 parts of polyvinyl chloride, 150 parts of flame retardant, 35 parts of azodicarbonamide, 1.5 parts of butadiene rubber, 2 parts of carbon black, 5 parts of paraffin, 65 parts of chlorinated paraffin oil, 2.5 parts of stearic acid, 2 parts of epoxidized soybean oil, 0.8 parts of antioxidant, and 0.5 parts of zinc oxide were added to an internal mixer and mixed at 160°C for 12 minutes.

[0047] (2) adding 3.2 parts of accelerator and 0.6 parts of tetramethylthiuram disulfide to the material prepared in step (1), sending the mixture into an open mill and refining for 8 minutes, cooling the mixture to room temperature, and sending the mixture into an extruder for extrusion molding; the head temperature of the extruder was set at 50°C;

[0048] (3) placing the molding material prepared in step (2) in an oven for continuous vulcanization and foaming; the oven is divided into 7 vulcanization temperature zones: zone 1 105°C, feeding speed 1.2 m / min; zone 2 115°C, feeding speed 1.8 m / min; zone 3 125°C, feeding speed 2.8 m / min; zone 4 135°C, feeding speed 3.8 m / min; zone 5 155°C, feeding speed 5 m / min; zone 6 165°C, feeding speed 7 m / min; zone 7 170°C, feeding speed 7.8 m / min;

[0049] (4) The molded foam material prepared in step (3) is cooled to room temperature, cut into finished foam materials with a length of 6 m, and then packaged and stored.

[0050] Comparative Example 2

[0051] A flame-retardant foaming material comprises the following raw materials in parts by weight: 30 parts of nitrile rubber, 55 parts of polyvinyl chloride, 150 parts of a flame retardant, 35 parts of azodicarbonamide, 1.5 parts of butadiene rubber, 2 parts of carbon black, 5 parts of paraffin, 65 parts of chlorinated paraffin oil, 2.5 parts of stearic acid, 2 parts of epoxidized soybean oil, 0.8 parts of antioxidant, 3.2 parts of accelerator, 0.5 parts of zinc oxide, and 0.6 parts of tetramethylthiuram disulfide; the flame retardant comprises the following components in parts by weight: 120 parts of aluminum hydroxide and 30 parts of tetrabromobisphenol A bisallyl ether; the antioxidant is a mixture of Cyanox 1790 and antioxidant 300 in a mass ratio of 1:2; and the accelerator comprises the following components in parts by weight: 2.3 parts of accelerator PZ, 0.45 parts of accelerator ZBS, and 0.45 parts of accelerator DPTT.

[0052] The preparation method of the flame retardant foam material is carried out according to the following steps:

[0053] (1) According to the weight ratio, 30 parts of nitrile rubber, 55 parts of polyvinyl chloride, 150 parts of flame retardant, 35 parts of azodicarbonamide, 1.5 parts of butadiene rubber, 2 parts of carbon black, 5 parts of paraffin, 65 parts of chlorinated paraffin oil, 2.5 parts of stearic acid, 2 parts of epoxidized soybean oil, 0.8 parts of antioxidant, and 0.5 parts of zinc oxide were added to an internal mixer and mixed at 160°C for 12 minutes.

[0054] (2) adding 3.2 parts of accelerator and 0.6 parts of tetramethylthiuram disulfide to the material prepared in step (1), sending the mixture into an open mill and refining for 8 minutes, cooling the mixture to room temperature, and sending the mixture into an extruder for extrusion molding; the head temperature of the extruder was set at 50°C;

[0055] (3) placing the molding material prepared in step (2) in an oven for continuous vulcanization and foaming; the oven is divided into 7 vulcanization temperature zones: zone 1 105°C, feeding speed 1.2 m / min; zone 2 115°C, feeding speed 1.8 m / min; zone 3 125°C, feeding speed 2.8 m / min; zone 4 135°C, feeding speed 3.8 m / min; zone 5 155°C, feeding speed 5 m / min; zone 6 165°C, feeding speed 7 m / min; zone 7 170°C, feeding speed 7.8 m / min;

[0056] (4) The molded foam material prepared in step (3) is cooled to room temperature, cut into finished foam materials with a length of 6 m, and then packaged and stored.

[0057] Comparative Example 3

[0058] A flame-retardant foaming material comprises the following raw materials in parts by weight: 30 parts of nitrile rubber, 55 parts of polyvinyl chloride, 150 parts of a flame retardant, 35 parts of azodicarbonamide, 1.5 parts of butadiene rubber, 2 parts of carbon black, 5 parts of paraffin wax, 65 parts of chlorinated paraffin oil, 2.5 parts of stearic acid, 2 parts of epoxidized soybean oil, 0.8 part of Cyanox 1790, 3.2 parts of an accelerator, 0.5 part of zinc oxide, and 0.6 part of tetramethylthiuram disulfide; the flame retardant comprises the following components in parts by weight: 120 parts of aluminum hydroxide, 20 parts of 2-carboxyethylphenylphosphinic acid, and 10 parts of tetrabromobisphenol A bisallyl ether; and the accelerator comprises the following components in parts by weight: 2.3 parts of accelerator PZ, 0.45 parts of accelerator ZBS, and 0.45 parts of accelerator DPTT.

[0059] The preparation method of the flame retardant foam material is carried out according to the following steps:

[0060] (1) According to the weight ratio, 30 parts of nitrile rubber, 55 parts of polyvinyl chloride, 150 parts of flame retardant, 35 parts of azodicarbonamide, 1.5 parts of butadiene rubber, 2 parts of carbon black, 5 parts of paraffin, 65 parts of chlorinated paraffin oil, 2.5 parts of stearic acid, 2 parts of epoxidized soybean oil, 0.8 parts of Cyanox 1790, and 0.5 parts of zinc oxide were added to an internal mixer and mixed at 160°C for 12 minutes.

[0061] (2) adding 3.2 parts of accelerator and 0.6 parts of tetramethylthiuram disulfide to the material prepared in step (1), sending the mixture into an open mill and refining for 8 minutes, cooling the mixture to room temperature, and sending the mixture into an extruder for extrusion molding; the head temperature of the extruder was set at 50°C;

[0062] (3) placing the molding material prepared in step (2) in an oven for continuous vulcanization and foaming; the oven is divided into 7 vulcanization temperature zones: zone 1 105°C, feeding speed 1.2 m / min; zone 2 115°C, feeding speed 1.8 m / min; zone 3 125°C, feeding speed 2.8 m / min; zone 4 135°C, feeding speed 3.8 m / min; zone 5 155°C, feeding speed 5 m / min; zone 6 165°C, feeding speed 7 m / min; zone 7 170°C, feeding speed 7.8 m / min;

[0063] (4) The molded foam material prepared in step (3) is cooled to room temperature, cut into finished foam materials with a length of 6 m, and then packaged and stored.

[0064] Comparative Example 4

[0065] A flame-retardant foaming material comprises the following raw materials in parts by weight: 30 parts of nitrile rubber, 55 parts of polyvinyl chloride, 150 parts of a flame retardant, 35 parts of azodicarbonamide, 1.5 parts of butadiene rubber, 2 parts of carbon black, 5 parts of paraffin, 65 parts of chlorinated paraffin oil, 2.5 parts of stearic acid, 2 parts of epoxidized soybean oil, 0.8 parts of antioxidant 300, 3.2 parts of accelerator, 0.5 parts of zinc oxide, and 0.6 parts of tetramethylthiuram disulfide; the flame retardant comprises the following components in parts by weight: 120 parts of aluminum hydroxide, 20 parts of 2-carboxyethylphenylphosphinic acid, and 10 parts of tetrabromobisphenol A bisallyl ether; and the accelerator comprises the following components in parts by weight: 2.3 parts of accelerator PZ, 0.45 parts of accelerator ZBS, and 0.45 parts of accelerator DPTT.

[0066] The preparation method of the flame retardant foam material is carried out according to the following steps:

[0067] (1) According to the weight ratio, 30 parts of nitrile rubber, 55 parts of polyvinyl chloride, 150 parts of flame retardant, 35 parts of azodicarbonamide, 1.5 parts of butadiene rubber, 2 parts of carbon black, 5 parts of paraffin, 65 parts of chlorinated paraffin oil, 2.5 parts of stearic acid, 2 parts of epoxidized soybean oil, 0.8 parts of antioxidant 300, and 0.5 parts of zinc oxide were added to an internal mixer and mixed at 160°C for 12 minutes;

[0068] (2) adding 3.2 parts of accelerator and 0.6 parts of tetramethylthiuram disulfide to the material prepared in step (1), sending the mixture into an open mill and refining for 8 minutes, cooling the mixture to room temperature, and sending the mixture into an extruder for extrusion molding; the head temperature of the extruder was set at 50°C;

[0069] (3) placing the molding material prepared in step (2) in an oven for continuous vulcanization and foaming; the oven is divided into 7 vulcanization temperature zones: zone 1 105°C, feeding speed 1.2 m / min; zone 2 115°C, feeding speed 1.8 m / min; zone 3 125°C, feeding speed 2.8 m / min; zone 4 135°C, feeding speed 3.8 m / min; zone 5 155°C, feeding speed 5 m / min; zone 6 165°C, feeding speed 7 m / min; zone 7 170°C, feeding speed 7.8 m / min;

[0070] (4) The molded foam material prepared in step (3) is cooled to room temperature, cut into finished foam materials with a length of 6 m, and then packaged and stored.

[0071] Experimental example:

[0072] The oxygen index of the foaming materials prepared in Examples 1-3 and Comparative Examples 1-2 was determined according to the determination method of GB / T 2406.2-2009 "Determination of Combustion Behavior of Plastics by Oxygen Index Method". The experimental results were statistically analyzed using SPSS 24.0 software. The quantitative data were analyzed using The data were expressed as mean ± standard deviation. The Kolmogorov-Smirnov test was used for data normality test. For data that met the normal distribution, the t-test was used to compare the mean differences between the two groups. The difference was considered statistically significant when P < 0.05. The results are shown in Table 1:

[0073] Table 1

[0074]

[0075] Note: * represents P < 0.05 compared with the group in Example 1.

[0076] According to the method of DIN53424, the foam materials prepared in Examples 1-3 and Comparative Examples 3-4 were made into 40mm×40mm×20mm samples. The temperature was raised at a constant rate of 50℃ / h in a Martin heat-resistant box. The compression load mode was selected for loading and the pressure was 0.025MPa. The temperature at which the thickness of the sample decreased by 2mm was recorded as the thermal deformation temperature. The experimental results were statistically analyzed using SPSS24.0 software. The quantitative data results were used to The data were expressed as mean ± standard deviation. The Kolmogorov-Smirnov test was used for data normality test. For data that met the normal distribution, the t-test was used to compare the mean differences between the two groups. The difference was considered statistically significant when P < 0.05. The results are shown in Table 2:

[0077] Table 2

[0078]

[0079]

[0080] Note: * represents P < 0.05 compared with the group in Example 1.

[0081] The above-described embodiments merely illustrate several implementations of the present invention, and while their descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent. It should be noted that a person skilled in the art would be able to make numerous variations and improvements without departing from the spirit of the present invention, all of which fall within the scope of protection of the present invention. Therefore, the scope of protection of the patent for this invention shall be determined by the appended claims.

Claims

1. A flame retardant foam material, characterized in that: The invention comprises the following raw materials in parts by weight: 25-35 parts of nitrile rubber, 50-60 parts of polyvinyl chloride, 140-180 parts of flame retardant, 30-40 parts of foaming agent, 1-2 parts of butadiene rubber, 1-3 parts of carbon black, 4-6 parts of paraffin, 60-70 parts of chlorinated paraffin oil, 2-3 parts of lubricant, 1-3 parts of epoxidized soybean oil, 0.6-1.0 parts of antioxidant, 2-5 parts of accelerator, 0.3-0.6 parts of zinc oxide and 0.4-0.8 parts of vulcanizing agent.

2. The flame retardant foam material according to claim 1, characterized in that: The flame retardant includes the following components in parts by weight: 120 parts of aluminum hydroxide, 30 parts of decabromodiphenylethane, and 10 parts of antimony trioxide.

3. The flame retardant foam material according to claim 1, characterized in that: The flame retardant comprises the following components in parts by weight: 120 parts of aluminum hydroxide, 20 parts of 2-carboxyethylphenylphosphinic acid, and 10 parts of tetrabromobisphenol A bisallyl ether.

4. The flame retardant foam material according to claim 1, characterized in that: The foaming agent is one or more of azodicarbonamide, benzenesulfonylhydrazide, p-toluenesulfonylhydrazide and sodium bicarbonate.

5. The flame retardant foam material according to claim 1, characterized in that: The lubricant is one or more of stearic acid, zinc stearate, and 2-(pentaerythritol triisooctanoate) adipate.

6. The flame retardant foam material according to claim 1, characterized in that: The antioxidant is a mixture of Cyanox 1790 and antioxidant 300 in a mass ratio of 1:

2.

7. The flame retardant foam material according to claim 1, characterized in that: The accelerator includes the following components in parts by weight: 2.3 parts of accelerator PZ, 0.45 parts of accelerator ZBS, and 0.45 parts of accelerator DPTT.

8. The flame retardant foam material according to claim 1, characterized in that: The vulcanizing agent is one or more of tetramethylthiuram disulfide, morpholine disulfide, dicumyl peroxide, benzoyl peroxide, and hexamethylenediamine.

9. The method for preparing the flame retardant foam material according to claim 1, characterized in that: Follow these steps: (1) According to the weight ratio, 25-35 parts of nitrile rubber, 50-60 parts of polyvinyl chloride, 140-180 parts of flame retardant, 30-40 parts of foaming agent, 1-2 parts of butadiene rubber, 1-3 parts of carbon black, 4-6 parts of paraffin, 60-70 parts of chlorinated paraffin oil, 2-3 parts of lubricant, 1-3 parts of epoxidized soybean oil, 0.6-1.0 parts of antioxidant, and 0.3-0.6 parts of zinc oxide are added to an internal mixer and mixed at 140-180°C for 10-15 minutes; (2) adding 2-5 parts of accelerator and 0.4-0.8 parts of vulcanizing agent to the material prepared in step (1), sending the mixture into an open mill for 5-10 minutes, cooling the mixture to room temperature, and sending the mixture into an extruder for extrusion molding; (3) placing the molding material prepared in step (2) in an oven for continuous vulcanization and foaming; (4) The molded foam material prepared in step (3) is cooled to room temperature, cut into finished foam materials with a length of 2-10 m, and then packaged and stored.

10. The method for preparing the flame retardant foam material according to claim 9, characterized in that: The head temperature of the extruder in step (2) is set to 40-60°C; the baking oven in step (3) is divided into 7 vulcanization temperature zones: zone 1 100-110°C, feeding speed 1.0-1.5 m / min; zone 2 110-120°C, feeding speed 1.5-2.0 m / min; zone 3 120-130°C, feeding speed 2.5-3.0 m / min; zone 4 130-140°C, feeding speed 3.5-4.0 m / min; zone 5 150-160°C, feeding speed 4.5-5.5 m / min; zone 6 160-170°C, feeding speed 6.5-7.5 m / min; zone 7 165-175°C, feeding speed 7.5-8.0 m / min.

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