A foam tape based on EPDM rubber

Abstract

The invention relates to the technical field of polymer materials, and discloses a foam tape based on EPDM rubber. The raw materials of the tape and the weight range thereof are: 80-100 parts of EPDM rubber; 15-20 parts of C5 petroleum resin; 5-9 parts of n-butyl-4,4-di-tert-butyl peroxyvalerate; 3-7 parts of kaolin; 0.5-1.5 parts of sulfur; 2-5 parts of maleic anhydride polybutadiene resin; 4.7-8 parts of ammonium polyphosphate; 5-10 parts of aluminum hydroxide; 9-11 parts of flame retardant; and 5-10 parts of auxiliary components. The flame retardant consists of expandable graphite and red phosphorus in a weight ratio of 3:1, and the auxiliary component consists of magnesium hydroxide. The finished tape product is prepared by the joint action of the above raw materials and according to specific preparation steps, so that the finished tape product does not contain halogen elements and has aging resistance, heat resistance and flame retardancy. At the same time, the invention adopts a microwave desulfurization method to recycle and reuse the vulcanized waste tape, thereby solving the problem of waste generated after the tape is used in the traditional technology.

Description

Technical Field

[0001] The invention relates to the technical field of polymer materials, in particular to a foam tape based on EPDM rubber. Background Art

[0002] The environmental shortcomings of traditional foam tapes include halogen content and waste disposal.

[0003] In terms of halogen content, traditional flame retardants often contain halogen elements such as chlorine and bromine. Although these halogen elements have good flame retardant properties, they may cause serious environmental pollution during production and use. For example, when these halogen-containing flame retardants are released into the environment, they may cause long-term negative impacts on the atmosphere, water bodies and soil. In addition, halogen elements may also pose a potential threat to human health, such as affecting the endocrine system and causing cancer. Therefore, the development of halogen-free flame retardants has become an important research direction at present. Halogen-free flame retardants can not only reduce environmental pollution, but also improve the safety of products.

[0004] In terms of waste disposal, EPDM foam tapes will generate waste during use, and if these wastes are not properly handled, they will pollute the environment. At present, most of the waste of foam tapes is treated as ordinary garbage, which not only wastes resources but also burdens the environment. How to effectively recycle and reuse these wastes is an urgent problem to be solved. Some companies have begun to develop degradable foam tapes, which can be decomposed under natural conditions after use, thereby reducing pollution to the environment. In addition, establishing a complete waste recycling and treatment system is also the key to solving this problem.

[0005] In summary, traditional foam tapes have obvious defects in environmental protection, especially in halogen content and waste disposal. In order to improve the environmental performance of foam tapes, it is necessary to start from multiple aspects such as material formulation, production process, and waste management to promote the sustainable development of the industry. Summary of the invention

[0006] 1. Technical issues to be resolved

[0007] In view of the deficiencies in the prior art, the present invention provides a foam tape based on EPDM rubber, which has the advantage of being environmentally friendly and solves the problems of excessive halogen content in the tape and generation of waste during use in the traditional technology.

[0008] (II) Technical solution

[0009] To achieve the above-mentioned purpose, the present invention provides the following technical scheme: a foam tape based on EPDM rubber, wherein the raw materials of the tape and their weight proportions are as follows: 80 to 100 parts of EPDM rubber; 15 to 20 parts of C5 petroleum resin; 5 to 9 parts of n-butyl-4,4-di-tert-butyl peroxyvalerate; 3 to 7 parts of kaolin; 0.5 to 1.5 parts of sulfur; 2 to 5 parts of maleic anhydride polybutadiene resin; 4.7 to 8 parts of ammonium polyphosphate; 5 to 10 parts of aluminum hydroxide; 9 to 11 parts of flame retardant; and 5 to 10 parts of auxiliary components.

[0010] Preferably, the flame retardant is composed of expandable graphite and red phosphorus in a weight ratio of 3:1, and the auxiliary component is composed of magnesium hydroxide.

[0011] Preferably, the raw materials of the tape and their weight parts are: 100 parts of EPDM rubber; 20 parts of C5 petroleum resin; 8 parts of n-butyl-4,4-di-tert-butyl peroxyvalerate; 5 parts of kaolin; 1.0 parts of sulfur; 2.5 parts of maleic anhydride polybutadiene resin; 6.0 parts of ammonium polyphosphate; 5.5 parts of aluminum hydroxide; 10 parts of flame retardant; and 8 parts of auxiliary components.

[0012] Preferably, the raw materials of the tape and their weight parts are: 90 parts of EPDM rubber; 16 parts of C5 petroleum resin; 6 parts of n-butyl-4,4-di-tert-butyl peroxyvalerate; 3.3 parts of kaolin; 0.9 parts of sulfur; 5 parts of maleic anhydride polybutadiene resin; 7 parts of ammonium polyphosphate; 5 parts of aluminum hydroxide; 9 parts of flame retardant; and 7 parts of auxiliary components.

[0013] Preferably, a foam tape based on EPDM rubber comprises the following steps:

[0014] Step 1, prepare raw materials: weigh EPDM rubber, C5 petroleum resin, n-butyl-4,4-di-tert-butyl peroxyvalerate, kaolin, sulfur, maleic anhydride polybutadiene resin, ammonium polyphosphate, aluminum hydroxide, expandable graphite, red phosphorus and magnesium hydroxide according to the formula weight parts;

[0015] Step 2, main raw material mixing stage: add EPDM rubber as the main raw material into an internal mixer and set mixing conditions;

[0016] Step 3, auxiliary raw material mixing stage: adding C5 petroleum resin and n-butyl-4,4-di-tert-butyl peroxyvalerate into an internal mixer, adjusting the parameters of the internal mixer, and forming a mixed material;

[0017] Step 4, vulcanization stage: transfer the mixed material to an open mill, set the mixing parameters, add kaolin, sulfur, maleic anhydride polybutadiene resin in sequence, then lower the temperature of the open mill by 20-25°C, add ammonium polyphosphate, aluminum hydroxide, magnesium hydroxide, expandable graphite and red phosphorus, and continue mixing on the open mill for 10-15 minutes;

[0018] Step 5: The formed mixture is left to stand for 5-8 hours and then transferred to a mold plate of a high-temperature vulcanizer for vulcanization;

[0019] Step 6, Foaming stage: The vulcanized mixture is foamed using a supercritical CO2 process, and a foam tape is obtained by the action of a supercritical foaming device at a temperature of 45-65°C.

[0020] Preferably, the mixing conditions of the main raw materials in step 2 are: the temperature of the internal mixer is set to 60-65° C., the speed is set to 95-100 r / min, and the mixing time is controlled between 25-30 min.

[0021] Preferably, in step 3, the parameters of the internal mixer are adjusted as follows: the temperature of the internal mixer is increased to 70-75° C., the speed is reduced to 70-85 r / min, and the duration is shortened to 10-15 min.

[0022] Preferably, the mixing parameters in step 4 are: roller distance between 0.5-2 mm, roller temperature range between 40-70° C., and mixing time between 25-30 min.

[0023] Preferably, the vulcanization conditions in step five are: the vulcanization temperature is set at 150-155° C., the pressure is set at 70-75 kn, and the vulcanization time is set at 50-55 min.

[0024] Preferably, after the foam tape is used, the vulcanized waste tape is recycled and reused by microwave desulfurization and used again as the main raw material for regenerating the foam tape.

[0025] Compared with the prior art, the present invention provides a foam tape based on EPDM rubber, which has the following beneficial effects:

[0026] 1. The present invention adopts halogen-free raw materials, including EPDM rubber, C5 petroleum resin, n-butyl-4,4-di-tert-butyl peroxyvalerate, kaolin, sulfur, maleic anhydride polybutadiene resin, ammonium polyphosphate, aluminum hydroxide, expandable graphite, red phosphorus and magnesium hydroxide. The finished tape is made by the joint action of the above raw materials and according to specific preparation steps, so that the finished tape does not contain halogen elements and has aging resistance, heat resistance and flame retardancy.

[0027] 2. The present invention adopts microwave desulfurization to recycle and reuse the vulcanized waste tape, thereby solving the problem of waste generated after the use of the tape in traditional technology. This method uses microwave desulfurization to treat the discarded EPDM rubber foam tape, so that it becomes a reusable raw material for the production of recycled foam tape. This process can not only effectively reduce the generation of waste, but also reduce environmental pollution, and at the same time realize the recycling of resources, thereby having environmental and economic benefits. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 A flow chart was prepared for the present invention. DETAILED DESCRIPTION

[0029] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0030] See also Figure 1 , a foam tape based on EPDM rubber, the raw materials of the tape and their weight ranges are: 80-100 parts of EPDM rubber; 15-20 parts of C5 petroleum resin; 5-9 parts of n-butyl-4,4-di-tert-butyl peroxyvalerate; 3-7 parts of kaolin; 0.5-1.5 parts of sulfur; 2-5 parts of maleic anhydride polybutadiene resin; 4.7-8 parts of ammonium polyphosphate; 5-10 parts of aluminum hydroxide; 9-11 parts of flame retardant (expandable graphite and red phosphorus) (increases flame retardant effect and inhibits the effect on SiO2); 5-10 parts of auxiliary ingredients (increases flame retardant effect and has environmentally friendly and easy to decompose effects).

[0031] The following is a detailed list of the raw materials and their functions in EPDM foam tape:

[0032] Table 1

[0033]

[0034]

[0035] The combined effect of the above raw materials makes the EPDM foam tape resistant to aging, heat and flame retardant.

[0036] Specifically, the flame retardant is composed of expandable graphite and red phosphorus in a weight ratio of 3:1, and the auxiliary component is composed of magnesium hydroxide.

[0037] Specifically, a foam tape based on EPDM rubber comprises the following steps:

[0038] Step 1, prepare raw materials: weigh EPDM rubber, C5 petroleum resin, n-butyl-4,4-di-tert-butyl peroxyvalerate, kaolin, sulfur, maleic anhydride polybutadiene resin, ammonium polyphosphate, aluminum hydroxide, expandable graphite, red phosphorus and magnesium hydroxide according to the formula weight parts;

[0039] Step 2, main raw material mixing stage: add EPDM as the main raw material into the internal mixer and set the mixing conditions (because it has good vulcanization characteristics and excellent weather resistance, wear resistance and aging resistance);

[0040] Step 3, auxiliary raw material mixing stage: C5 petroleum resin and n-butyl-4,4-di-tert-butyl peroxyvalerate are added to an internal mixer, and the parameters of the internal mixer are adjusted (these ingredients help to improve the processing performance and physical properties of the material) to form a mixed material;

[0041] Step 4, vulcanization stage: transfer the mixed material to an open mill, set the mixing parameters, add kaolin (adding kaolin as a filler can enhance the mechanical strength and flame retardant effect of the material), sulfur (sulfur as a vulcanizing agent, and EPDM rubber work together to form a stable cross-linked structure, thereby improving the overall performance of the material), maleic anhydride polybutadiene resin (maleic anhydride polybutadiene resin is used to improve the bonding performance of EPDM rubber and fiber, increase the durability of the material), then lower the temperature of the open mill by 20-25 ° C, add ammonium polyphosphate, aluminum hydroxide, magnesium hydroxide (they work synergistically, can form a carbon layer at high temperature, isolate oxygen and heat, thereby effectively inhibiting combustion), expandable graphite and red phosphorus (expandable graphite and red phosphorus in the flame retardant further enhance the flame retardant effect, and help to inhibit the effect of SiO2), and continue mixing on the open mill for 10-15 minutes;

[0042] Step 5: The formed mixture is left to stand for 5-8 hours and then transferred to a mold plate of a high-temperature vulcanizer for vulcanization;

[0043] Step 6, Foaming stage: The vulcanized mixture is foamed using a supercritical CO2 process, and a foam tape is obtained by the action of a supercritical foaming device at a temperature of 45-65°C.

[0044] Specifically, the mixing conditions of the main raw materials in step 2 are: the temperature of the internal mixer is set to 60-65° C., the speed is set to 95-100 r / min, and the mixing time is controlled between 25-30 min.

[0045] Specifically, in step 3, the parameters of the internal mixer are adjusted as follows: the temperature of the internal mixer is increased to 70-75° C., the speed is reduced to 70-85 r / min, and the duration is shortened to 10-15 min.

[0046] Specifically, the mixing parameters in step 4 are: roller distance between 0.5-2 mm, roller temperature range of 40-70° C., and mixing time of 25-30 min (continue mixing on the open mill to ensure uniformity before thinning the sheet).

[0047] Specifically, the vulcanization conditions in step five are: the vulcanization temperature is set to 150-155° C., the pressure is set to 70-75 kn, and the vulcanization time is set to 50-55 min.

[0048] Example 1

[0049] The raw materials of the tape and their weight parts are: 100 parts of EPDM rubber; 20 parts of C5 petroleum resin; 8 parts of n-butyl-4,4-di-tert-butyl peroxyvalerate; 5 parts of kaolin; 1.0 parts of sulfur; 2.5 parts of maleic anhydride polybutadiene resin; 6.0 parts of ammonium polyphosphate; 5.5 parts of aluminum hydroxide; 10 parts of expandable graphite and red phosphorus; and 8 parts of magnesium hydroxide.

[0050] Example 2

[0051] The raw materials of the tape and their weight parts are: 90 parts of EPDM rubber; 16 parts of C5 petroleum resin; 6 parts of n-butyl-4,4-di-tert-butyl peroxyvalerate; 3.3 parts of kaolin; 0.9 parts of sulfur; 5 parts of maleic anhydride polybutadiene resin; 7 parts of ammonium polyphosphate; 5 parts of aluminum hydroxide; 9 parts of expandable graphite and red phosphorus; and 7 parts of magnesium hydroxide.

[0052] Comparative Example 1

[0053] The raw materials of the tape and their weight parts are: 100 parts of chlorinated polyethylene; 20 parts of chlorinated paraffin; 8 parts of sulfur chloride; 5 parts of aluminum hydroxide; 1.0 part of sulfur chloride; 2.5 parts of chloroprene rubber; 6.0 parts of ammonium polyphosphate; 5.5 parts of aluminum hydroxide; 10 parts of expandable graphite and red phosphorus; and 8 parts of magnesium hydroxide.

[0054] Comparative Example 2

[0055] The raw materials of the tape and their weight parts are: 90 parts of EPDM rubber; 16 parts of C5 petroleum resin; 6 parts of n-butyl-4,4-di-tert-butyl peroxyvalerate; 3.3 parts of kaolin; 0.9 parts of sulfur; 5 parts of maleic anhydride polybutadiene resin; 7 parts of decabromodiphenyl ether; 5 parts of aluminum hydroxide; 9 parts of decabromodiphenyl ether and antimony trioxide; and 7 parts of aluminum hydroxide.

[0056] The formulations of the above examples and comparative examples were made into foam tapes, and the halogen content, aging resistance, heat resistance and flame retardancy were measured. The test results are shown in Table 2:

[0057] Table 2

[0058]

[0059]

[0060] According to Table 2, the performance of different formulations is analyzed as follows:

[0061] Halogen content determination: Example 1 and Example 2 have a low halogen content, both of which are 0.0%, indicating that the raw materials of the examples are environmentally friendly and will not cause any impact of halogen elements on the environment. However, the halogen content of Comparative Example 1 and Comparative Example 2 is relatively high, at 2.0% and 1.5% respectively, which will have a greater impact on the environment and human health.

[0062] Aging resistance: Example 1 has the best aging resistance, which can last for 500 hours, indicating that it is more stable in long-term use. Example 2 and Comparative Example 1 have the second best aging resistance, which are 450 hours and 300 hours respectively. Comparative Example 2 has the worst aging resistance, which is 350 hours.

[0063] Heat resistance: Example 1 has the best heat resistance and can withstand a high temperature of 150°C. Example 2 and Comparative Example 2 have the second best heat resistance, which are 145°C and 130°C respectively. Comparative Example 1 has the worst heat resistance, which is 120°C.

[0064] Flame retardant properties: Example 1 has the best flame retardant properties, with an oxygen index of 28%, indicating that it is less likely to burn in a fire. Example 2 has the second best flame retardant properties, with an oxygen index of 27%, while Comparative Examples 1 and 2 have poor flame retardant properties, with oxygen indexes of 20% and 22%, respectively.

[0065] Therefore, according to the analysis process of the above test result data, Example 1 performs best in terms of halogen element determination, aging resistance, heat resistance and flame retardancy, and is the best formula.

[0066] The suggestions for optimizing proportional performance are:

[0067] Reducing halogen elements: For Comparative Examples 1 and 2, the use of raw materials containing halogen elements such as chlorinated polyethylene, chlorinated paraffin and decabromodiphenyl ether is reduced to reduce the content of halogen elements and improve environmental protection.

[0068] Improve aging resistance: Improve the aging resistance of the tape by adding anti-aging agents or improving the formula.

[0069] Improve heat resistance: Improve the heat resistance of the tape by adding heat-resistant agents or selecting raw materials with better heat resistance.

[0070] Improve flame retardant properties: Improve the flame retardant properties of the tape by adding flame retardants or choosing more effective flame retardants.

[0071] Example 3

[0072] (1) After the foam tape is used, the vulcanized waste tape is treated by microwave desulfurization to obtain recycled tape, which is used as the main raw material for recycled foam tape;

[0073] (2) The raw materials of the tape and their weight parts are: 85 parts of recycled tape; 17 parts of C5 petroleum resin; 6 parts of n-butyl-4,4-di-tert-butyl peroxyvalerate; 5 parts of kaolin; 1 part of sulfur; 3 parts of maleic anhydride polybutadiene resin; 6 parts of ammonium polyphosphate; 6 parts of aluminum hydroxide; 11 parts of flame retardant; 3 parts of auxiliary ingredients;

[0074] (3) The flame retardant is composed of expandable graphite and red phosphorus in a weight ratio of 3:1, and the auxiliary component is composed of magnesium hydroxide;

[0075] (4) The above formulation is prepared according to the preparation steps of the present invention.

[0076] Comparative Example 3

[0077] (1) The raw materials of the tape and their weight parts are: 85 parts of EPDM rubber; 17 parts of C5 petroleum resin; 6 parts of n-butyl-4,4-di-tert-butyl peroxyvalerate; 5 parts of kaolin; 1 part of sulfur; 3 parts of maleic anhydride polybutadiene resin; 6 parts of ammonium polyphosphate; 6 parts of aluminum hydroxide; 11 parts of flame retardant; 3 parts of auxiliary components;

[0078] (2) the flame retardant is composed of expandable graphite and red phosphorus in a weight ratio of 3:1, and the auxiliary component is composed of magnesium hydroxide;

[0079] (3) The above formulation is prepared according to the preparation steps of the present invention.

[0080] The above embodiments and comparative examples were made into adhesive tapes, and the halogen content, aging resistance, heat resistance and flame retardancy were measured, and the environmental protection and regeneration properties were evaluated. The measurement and evaluation results are shown in Table 3 below:

[0081] Table 3

[0082]

[0083]

[0084] As can be seen from Table 3, in Example 3, the vulcanized waste tape is treated by microwave desulfurization to obtain a regenerated tape, which is used again as the main raw material for the regenerated foam tape. The results of the halogen element determination, aging resistance, heat resistance and flame retardancy of the obtained finished tape are not much different from those of the comparative example. Therefore, it can be determined that the method for treating used waste tapes of the present invention is not only environmentally friendly, but also can reduce the cost of raw materials.

[0085] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A foam tape based on EPDM rubber, characterized in that: The raw materials of the adhesive tape and their weight ranges are: 80-100 parts of EPDM rubber; 15-20 parts of C5 petroleum resin; 5-9 parts of n-butyl-4,4-di-tert-butyl peroxyvalerate; 3-7 parts of kaolin; 0.5-1.5 parts of sulfur; 2-5 parts of maleic anhydride polybutadiene resin; 4.7-8 parts of ammonium polyphosphate; 5-10 parts of aluminum hydroxide; 9-11 parts of flame retardant; and 5-10 parts of auxiliary components.

2. The EPDM-based foam tape according to claim 1, characterized in that: The flame retardant is composed of expandable graphite and red phosphorus in a weight ratio of 3:1, and the auxiliary component is composed of magnesium hydroxide.

3. The EPDM-based foam tape according to claim 1, characterized in that: The raw materials of the adhesive tape and their weight parts are: 100 parts of EPDM rubber; 20 parts of C5 petroleum resin; 8 parts of n-butyl-4,4-di-tert-butyl peroxyvalerate; 5 parts of kaolin; 1.0 part of sulfur; 2.5 parts of maleic anhydride polybutadiene resin; 6.0 parts of ammonium polyphosphate; 5.5 parts of aluminum hydroxide; 10 parts of flame retardant; and 8 parts of auxiliary components.

4. The EPDM-based foam tape according to claim 1, characterized in that: The raw materials of the adhesive tape and their weight parts are: 90 parts of EPDM rubber; 16 parts of C5 petroleum resin; 6 parts of n-butyl-4,4-di-tert-butyl peroxyvalerate; 3.3 parts of kaolin; 0.9 parts of sulfur; 5 parts of maleic anhydride polybutadiene resin; 7 parts of ammonium polyphosphate; 5 parts of aluminum hydroxide; 9 parts of flame retardant; and 7 parts of auxiliary components.

5. The EPDM-based foam tape according to claim 1, characterized in that: The following steps are involved: Step 1, prepare raw materials: weigh EPDM rubber, C5 petroleum resin, n-butyl-4,4-di-tert-butyl peroxyvalerate, kaolin, sulfur, maleic anhydride polybutadiene resin, ammonium polyphosphate, aluminum hydroxide, expandable graphite, red phosphorus and magnesium hydroxide according to the formula weight parts; Step 2, main raw material mixing stage: add EPDM rubber as the main raw material into an internal mixer and set mixing conditions; Step 3, auxiliary raw material mixing stage: adding C5 petroleum resin and n-butyl-4,4-di-tert-butyl peroxyvalerate into an internal mixer, adjusting the parameters of the internal mixer, and forming a mixed material; Step 4, vulcanization stage: transfer the mixed material to an open mill, set the mixing parameters, add kaolin, sulfur, maleic anhydride polybutadiene resin in sequence, then lower the temperature of the open mill by 20-25°C, add ammonium polyphosphate, aluminum hydroxide, magnesium hydroxide, expandable graphite and red phosphorus, and continue mixing on the open mill for 10-15 minutes; Step 5: The formed mixture is left to stand for 5-8 hours and then transferred to a mold plate of a high-temperature vulcanizer for vulcanization; Step 6, Foaming stage: The vulcanized mixture is foamed using a supercritical CO2 process, and a foam tape is obtained by the action of a supercritical foaming device at a temperature of 45-65°C.

6. The EPDM-based foam tape according to claim 5, characterized in that: The mixing conditions of the main raw materials in step 2 are: the temperature of the internal mixer is set to 60-65° C., the speed is set to 95-100 r / min, and the mixing time is controlled between 25-30 min.

7. The EPDM-based foam tape according to claim 5, characterized in that: In step 3, the parameters of the internal mixer are adjusted as follows: the temperature of the internal mixer is raised to 70-75° C., the speed is lowered to 70-85 r / min, and the duration is shortened to 10-15 min.

8. The EPDM-based foam tape according to claim 5, characterized in that: The mixing parameters in step 4 are: roller distance between 0.5-2 mm, roller temperature range between 40-70° C., and mixing time between 25-30 min.

9. The EPDM-based foam tape according to claim 5, characterized in that: The vulcanization conditions in step 5 are: the vulcanization temperature is set to 150-155° C., the pressure is set to 70-75 kn, and the vulcanization time is set to 50-55 min.

10. The EPDM-based foam tape according to claim 5, characterized in that: After the foam tape is used, the vulcanized waste tape is recycled and reused by adopting a microwave desulfurization method, and is used again as the main raw material for regenerating the foam tape.

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