CN112708183A - Easily-degradable light high-strength PE + EPP mixed foaming material and preparation method thereof - Google Patents
Easily-degradable light high-strength PE + EPP mixed foaming material and preparation method thereof Download PDFInfo
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Abstract
The invention discloses an easily degradable light high-strength PE + EPP mixed foaming material which comprises the following components in parts by weight: random copolymerized polypropylene: 60-80 parts of low-density polyethylene: 50-100 parts of ethylene propylene diene monomer: 20-40 parts of titanium dioxide: 2-4 parts of modified foaming agent: 1-5 parts; the invention also provides a preparation method of the easily degradable light high-strength PE + EPP mixed foaming material, which comprises the following steps: s1, preparing materials: preparing corresponding raw materials, screening the raw materials to obtain qualified raw materials, and weighing the corresponding raw materials according to parts by weight. The product improves the rigidity and the strength of the product through improving the formula of the existing common PE foaming material, prolongs the service life of the product, facilitates the degradation and antistatic capability of the product, overcomes the defect that the common foaming material cannot be degraded, and improves the application range and the environmental protection performance of the product, thereby improving the competitive capacity of the product.
Description
Technical Field
The invention relates to the technical field of foaming materials, in particular to an easily degradable light high-strength PE + EPP mixed foaming material and a preparation method thereof.
Background
The soft foaming material is prepared by adding auxiliary materials such as a catalyst, a foam stabilizer, a foaming agent and the like into raw materials such as plastics (PE, EVA and the like) and rubber (SBR, CR and the like), and foaming through physical foaming or crosslinking, so that a large amount of fine foams appear in the plastics and the rubber, the volume is increased, the density is reduced, the soft foaming material is light in weight and good in softness, and has the functions of buffering, sound absorption, shock absorption, heat preservation, filtration and the like.
Polyethylene (PE) foam is an important foam material and is widely applied to the fields of household appliances, mechanical accessories, office supplies, communication equipment and the like. The PE foam has the advantages of light weight, no toxicity, no odor, good water absorption and the like.
The common PE foaming material has poor rigidity and strength, cannot be quickly degraded and limits the use of the common PE foaming material, so that an easily-degradable light high-strength PE + EPP mixed foaming material and a preparation method thereof are provided for solving the problems.
Disclosure of Invention
The invention aims to solve the defects in the prior art, and provides an easily degradable light high-strength PE + EPP mixed foaming material and a preparation method thereof.
In order to achieve the purpose, the invention adopts the following technical scheme:
an easily degradable light high-strength PE + EPP mixed foaming material comprises the following components in parts by weight: random copolymerized polypropylene: 60-80 parts of low-density polyethylene: 50-100 parts of ethylene propylene diene monomer: 20-40 parts of titanium dioxide: 2-4 parts of modified foaming agent: 1-5 parts of auxiliary foaming agent: 0.1-2 parts of polyethylene glycol: 2-5 parts of a toughening agent: 2-4 parts of preservative: 3-6 parts of photolysis biological enzyme mixed degradation additive: 5-10 parts of thermal oxidation degradation auxiliary agent, 5-10 parts of tasteless cross-linking agent: 0.5-0.7 part of antistatic agent: 1-2 parts of a composite antioxidant: 0.5-1.5 parts of ACR impact modifier: 3-5 parts of a stabilizer for preventing pyrolysis, 3-5 parts of a heat-resistant agent: 3-5 parts.
Preferably, the modified foaming agent is prepared by mixing 60-100 parts by weight of azodicarbonamide, 5-10 parts by weight of melamine, 5-15 parts by weight of urea and 1-3 parts by weight of cerium dioxide, and the auxiliary foaming agent adopts zinc oxide.
Preferably, the toughening agent is prepared by mixing 4-6 parts of polyamide, 4-8 parts of polyurethane, 4-6 parts of nano-scale titanium dioxide, 10-25 parts of silicone rubber and 10-15 parts of carboxyl nitrile rubber in parts by weight.
Preferably, the odorless crosslinking agent is di-tert-butylperoxyisopropyl benzene.
Preferably, the ACR impact modifier is a rigid particle.
The invention also provides a preparation method of the easily degradable light high-strength PE + EPP mixed foaming material, which comprises the following steps:
s1, preparing materials: preparing corresponding raw materials, screening the raw materials to obtain qualified raw materials, and weighing the corresponding raw materials according to parts by weight;
s2, mixing materials: mixing random copolymerization polypropylene, low-density polyethylene, ethylene propylene diene monomer, titanium dioxide, a modified foaming agent, a co-foaming agent, polyethylene glycol, a toughening agent, a preservative, a photolysis biological enzyme mixed degradation additive, a thermal oxidation degradation auxiliary agent, an odorless crosslinking agent, an antistatic agent, a composite antioxidant, an ACR impact modifier, a pyrolysis prevention stabilizer and a heat-resistant agent in an internal mixer, cooling the water in the internal mixer to 75-85 ℃, compressing the air to 0.7-0.9MPa, and discharging the materials when the material temperature is 105-110 ℃;
s3, open mixing: feeding the material discharged from the internal mixer into an open mill for open milling for 3-5 times, wherein the temperature of a front roller is 80-90 ℃, the temperature of a rear roller is 70-80 ℃, the roller spacing is 0.3-0.7 mm;
s4, discharging: feeding the milled material into a sheet discharging machine for processing to obtain a material sheet, and cooling, wherein the temperature of cooling water is less than or equal to 35 ℃;
s5, vulcanization foaming: feeding the material sheet into a flat vulcanizing machine for vulcanization foaming treatment, wherein the pressure is 0.8-0.85MPa, the vulcanization time is 10-30 minutes, and the vulcanization temperature is less than or equal to 180 ℃;
s6, cooling, forming and processing: and cooling and forming the vulcanized and foamed material sheet, and cutting to obtain a finished product.
Preferably, in the S2 mixing material, firstly, random copolymerization polypropylene, low density polyethylene, ethylene propylene diene monomer, auxiliary foaming agent, polyethylene glycol, toughening agent, preservative and tasteless crosslinking agent are added into an internal mixer to be mixed until the mixture is uniformly mixed; secondly, adding titanium dioxide, a modified foaming agent, a photolysis biological enzyme mixed degradation additive, a thermal oxidation degradation auxiliary agent, a composite antioxidant, an ACR impact modifier, an antistatic agent, a pyrolysis prevention stabilizer and a heat-resistant agent into an internal mixer for mixing, uniformly mixing and discharging materials.
Preferably, the temperature of the material mixing in the S1 is controlled to be 100-110 ℃.
Preferably, the cooling manner in S6 is water cooling.
The invention has the beneficial effects that:
1. the conventional PE foaming material can be modified by adding the random copolymerization polypropylene, the low-density polyethylene, the ethylene propylene diene monomer, the titanium dioxide, the modified foaming agent, the co-foaming agent, the antistatic agent and the composite antioxidant, so that the foaming quality is better, the color and the antistatic capability of the foaming material can be well improved, the application range of the foaming material is widened, and the service life of the foaming material is prolonged by the composite antioxidant;
2. the strength and toughness of the product can be well improved and the application range of the product can be further improved by adding ingredients such as a flexibilizer, a preservative, a photolysis biological enzyme mixed degradation additive, a thermal oxidation degradation auxiliary agent, an odorless cross-linking agent, an ACR impact modifier, a pyrolysis prevention stabilizer, a heat-resistant agent and the like, the product is convenient to degrade by using the photolysis biological enzyme mixed degradation additive, the product can be degraded into small molecules or decomposed by microorganisms for a certain time under the illumination condition, the defects that a common foaming material is difficult to decompose and rot are overcome, meanwhile, the thermal oxidation degradation auxiliary agent is used and can be decomposed under the heating condition, the degradation capability of the product is improved by matching with the photolysis biological enzyme mixed degradation additive, the cost of the product cannot be improved, the product is more environment-friendly, the competitiveness of the product is improved, the pyrolysis stabilizer and the heat-resistant agent are prevented from being added after the material mixing, the thermal stability of the finished product is prevented by densification, meanwhile, the product can be effectively degraded under a specific environmental condition, the product cannot be degraded after the use period of the product is finished, the environmental pollution is caused, the use period of the pyrolysis stabilizer and the heat-resistant agent is prevented from being 3 years, and the pyrolysis stabilizer and the heat-resistant agent are prevented from losing activity after the use period is finished, so that the product can begin to be degraded in the air by the mixed degradation additive of the thermal oxidation degradation auxiliary agent and the photolysis biological enzyme, the degradation rate can reach more than 95 within 1200 hours at the normal temperature of 18 ℃, or the degradation rate can reach 99% within 20 hours at the temperature of 60 ℃, or the degradation rate can reach more than 95% within 15 hours at the temperature of 70 ℃, and the product can be efficiently degraded after the use period is finished;
the product improves the rigidity and the strength of the product through improving the formula of the existing common PE foaming material, prolongs the service life of the product, facilitates the degradation and antistatic capability of the product, overcomes the defect that the common foaming material cannot be degraded, and improves the application range and the environmental protection performance of the product, thereby improving the competitive capacity of the product.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments.
Example 1
An easily degradable light high-strength PE + EPP mixed foaming material comprises the following components in parts by weight: random copolymerized polypropylene: 60-80 parts, the random copolymer improves the impact resistance, increases the flexibility, and reduces the melting temperature, thereby also reducing the thermal welding temperature; meanwhile, the chemical stability and the water vapor isolation performance are improved well, and the quality of a final product is improved; low density polyethylene: 50-100 parts of the polyethylene resin is the lightest variety of the polyethylene resin, has good flexibility, extensibility, electrical insulation, transparency, easy processability and certain air permeability, has good chemical stability, is alkali-resistant and resistant to common organic solvents, and can well reduce the quality of a finished product; ethylene propylene diene monomer: 20-40 parts of the coating, which has excellent ozone resistance, heat resistance, weather resistance and other aging resistance, is beneficial to prolonging the service life of the product and can well enable the product to be used in various environments; titanium dioxide: 2-4 parts, the final color of the product can be well improved.
In the present invention, the modified blowing agent: 1-5 parts of auxiliary foaming agent: 0.1-2 parts of modified foaming agent, which is prepared by mixing 60-100 parts of azodicarbonamide, 5-10 parts of melamine, 5-15 parts of urea and 1-3 parts of cerium dioxide by weight, wherein zinc oxide is adopted as the auxiliary foaming agent, the melamine and the urea can be used as foaming auxiliary agents, the decomposition conditions are completely and well controlled in the decomposition process of the azodicarbonamide, the problem of ammonia and other harmful gases remaining in the prepared material is solved, the problem that the thermal decomposition temperature range is too narrow and burst decomposition is caused to cause uneven material pore diameter in the foaming process of the azodicarbonamide is solved, the defect that the processing technology is difficult to control by using the azodicarbonamide as the foaming agent is also solved, and the foaming quality is further improved by the zinc oxide.
In the present invention, polyethylene glycol: 2-5 parts of lubricating agent, moisture retention, dispersibility, adhesive, antistatic agent and softening agent, can well improve the quality of the product and enable the product to have certain antistatic capability.
In the present invention, the toughening agent: 2-4 parts of toughening agent, wherein the toughening agent is prepared by mixing 4-6 parts of polyamide, 4-8 parts of polyurethane, 4-6 parts of nano-scale titanium dioxide, 10-25 parts of silicone rubber and 10-15 parts of carboxyl nitrile rubber in parts by weight, so that the flexibility of the product can be well improved, and the mechanical strength, the wear resistance and the better corrosion resistance of the product can be improved.
In the present invention, the preservative: 3-6 parts, the corrosion resistance is improved, the service life is prolonged, and the photolytic biological enzyme mixed degradation additive is as follows: 5-10 parts, so that the product can be rapidly degraded, and after the use period is finished, the product can be degraded into micromolecules or decomposed by microorganisms for a certain time under the illumination condition, and the defects that a common foaming material is difficult to decompose and rot are overcome, so that the environmental protection property of the product can be well improved; 5-10 parts of thermal-oxidative degradation auxiliary agent, wherein the thermal degradation agent is mainly organic peroxide, is heated and decomposed into free radicals to initiate polymer chain degradation, can quickly degrade the product after being heated to a certain temperature, and further improves the environmental protection performance of the product; odorless cross-linking agent: 0.5-0.7 part of odorless cross-linking agent which is di-tert-butylperoxyisopropyl benzene can reduce the peculiar smell of the product; antistatic agent: 1-2 parts, help to promote the antistatic ability of the product, promote its application range, compound antioxidant: 0.5-1.5 parts, the service life of the equipment is prolonged; ACR impact modifier: 3-5 parts of ACR impact modifier which is rigid particles and can further improve the strength of the product; 3-5 parts of a pyrolysis preventing stabilizer, a heat-resistant agent: 3-5 parts of heat-resistant agent, wherein the heat-resistant agent can effectively increase the thermal deformation temperature and mechanical properties of PE plastics including HDPE, LDPE, flame-retardant PE, mineral-filled PE and the like and common regenerated PE plastics, prevent the pyrolysis stabilizer from well ensuring good quality and resisting decomposition at normal temperature, ensure the pyrolysis stabilizer to be normally used within a certain time limit, decompose after exceeding the time limit, facilitate environmental protection, prevent the pyrolysis stabilizer and the heat-resistant agent from being added just after mixing and refining to prevent the finished product from being thermally stabilized, and simultaneously realize effective degradation under specific environmental conditions and after exceeding the certain time limit, so that the product cannot be degraded after the service cycle of the product is finished and causes environmental pollution.
The invention also provides a preparation method of the easily degradable light high-strength PE + EPP mixed foaming material, which comprises the following steps:
s1, preparing materials: preparing corresponding raw materials, screening the raw materials to obtain qualified raw materials, weighing the corresponding raw materials according to parts by weight, and ensuring the quality of the raw materials from the source so as to well improve the quality of products;
s2, mixing materials: mixing random copolymerization polypropylene, low-density polyethylene, ethylene propylene diene monomer, titanium dioxide, a modified foaming agent, a co-foaming agent, polyethylene glycol, a toughening agent, a preservative, a photolysis biological enzyme mixed degradation additive, a thermal oxidation degradation auxiliary agent, an odorless cross-linking agent, an antistatic agent, a composite antioxidant and an ACR impact modifier in an internal mixer, firstly adding the random copolymerization polypropylene, the low-density polyethylene, the ethylene propylene diene monomer, the co-foaming agent, the polyethylene glycol, the toughening agent, the preservative and the odorless cross-linking agent into the internal mixer, and mixing until the mixture is uniform; secondly, adding titanium dioxide, a modified foaming agent, a photolysis biological enzyme mixed degradation additive, a thermal oxidation degradation auxiliary agent, a composite antioxidant, an ACR impact modifier, an antistatic agent, a pyrolysis prevention stabilizer and a heat-resistant agent into an internal mixer for mixing, uniformly mixing, and discharging materials, wherein the temperature of the mixed materials is controlled to be 110-;
s3, open mixing: feeding the material discharged from the internal mixer into an open mill for open milling for 3-5 times, wherein the temperature of a front roller is 80-90 ℃, the temperature of a rear roller is 70-80 ℃, the roller spacing is 0.3-0.7 mm;
s4, discharging: the milled material is fed into a sheet discharging machine for processing to obtain a material sheet, and the material sheet is cooled, wherein the temperature of the cooling water is less than or equal to 35 ℃, so that the temperature of the product can be quickly reduced, and the subsequent treatment is convenient;
s5, vulcanization foaming: feeding the material sheet into a flat vulcanizing machine for vulcanization foaming treatment, wherein the pressure is 0.8-0.85MPa, the vulcanization time is 10-30 minutes, and the vulcanization temperature is less than or equal to 180 ℃;
s6, cooling, forming and processing: the tablet that will vulcanize the foaming and handle, after the cooling shaping, the cooling method is the water-cooling, enables product rapid cooling to make things convenient for follow-up staff to handle it, cutting process, installation specification is cut apart it, and guarantees cutting apart the level and smooth of face, gets the finished product, conveniently stores and operates, and the staff of being convenient for uses.
Example 2
An easily degradable light high-strength PE + EPP mixed foaming material comprises the following components in parts by weight: random copolymerized polypropylene: 65-75 parts of random copolymer, the impact resistance is improved, the flexibility is increased, and the melting temperature is reduced, so that the heat welding temperature is also reduced; meanwhile, the chemical stability and the water vapor isolation performance are improved well, and the quality of a final product is improved; low density polyethylene: 70-80 parts of the polyethylene resin is the lightest variety of the polyethylene resin, has good flexibility, extensibility, electrical insulation, transparency, easy processability and certain air permeability, has good chemical stability, is alkali-resistant and resistant to common organic solvents, and can well reduce the quality of a finished product; ethylene propylene diene monomer: 25-35 parts of the coating, which has excellent ozone resistance, heat resistance, weather resistance and other aging resistance, is beneficial to prolonging the service life of the product and can well enable the product to be used in various environments; titanium dioxide: 2.5 to 3.5 portions, and can well improve the final color of the product.
In the present invention, the modified blowing agent: 3-4 parts of a co-foaming agent: 1.2-1.4 parts, wherein the modified foaming agent is prepared by mixing 75-80 parts of azodicarbonamide, 7-8 parts of melamine, 10-11 parts of urea and 1.5-2.5 parts of cerium dioxide by weight, the auxiliary foaming agent adopts zinc oxide, the melamine and the urea can be used as foaming auxiliary agents, the decomposition conditions are completely and well controlled in the decomposition process of the azodicarbonamide, the problem of ammonia and other harmful gases remaining in the prepared material is solved, the problem that the thermal decomposition temperature range is too narrow and burst decomposition is caused to cause uneven pore diameter of the material is solved in the foaming process of the azodicarbonamide, the defect that the processing process is difficult to control by using the azodicarbonamide as the foaming agent is also solved, and the foaming quality is further improved by the zinc oxide.
In the present invention, polyethylene glycol: 3-4 parts of lubricating agent, moisture retention, dispersibility, adhesive, antistatic agent and softening agent, can well improve the quality of the product and enable the product to have certain antistatic capability.
In the present invention, the toughening agent: 2.5-3.5 parts of toughening agent, wherein the toughening agent is prepared by mixing 4.5-5.5 parts of polyamide, 5-7 parts of polyurethane, 4.5-5.5 parts of nano-scale titanium dioxide, 18-22 parts of silicone rubber and 12-14 parts of carboxyl nitrile rubber in parts by weight, so that the flexibility of the product can be well improved, and the mechanical strength, the wear resistance and the corrosion resistance of the product can be improved.
In the present invention, the preservative: 4-5.5 parts, the corrosion resistance is improved, the service life is prolonged, and the photolysis biological enzyme mixed degradation additive: 7-8 parts, so that the product can be rapidly degraded, and after the use period is finished, the product can be degraded into micromolecules or decomposed by microorganisms for a certain time under the illumination condition, and the defects that a common foaming material is difficult to decompose and rot are overcome, so that the environmental protection property of the product can be well improved; 7-8 parts of thermal-oxidative degradation auxiliary agent, wherein the thermal degradation agent is mainly organic peroxide, is heated and decomposed into free radicals to initiate polymer chain degradation, can quickly degrade the product after being heated to a certain temperature, and further improves the environmental protection performance of the product; odorless cross-linking agent: 0.5-0.7 part of odorless cross-linking agent which is di-tert-butylperoxyisopropyl benzene can reduce the peculiar smell of the product; antistatic agent: 1-2 parts, help to promote the antistatic ability of the product, promote its application range, compound antioxidant: 0.5-1.5 parts, the service life of the equipment is prolonged; ACR impact modifier: 3-5 parts of ACR impact modifier which is rigid particles can further improve the strength of the product, reduce the range of parts by weight and accurately match, thereby being beneficial to improving the quality of the product; 3-5 parts of a pyrolysis preventing stabilizer, a heat-resistant agent: 3-5 parts of heat-resistant agent, wherein the heat-resistant agent can effectively increase the thermal deformation temperature and mechanical properties of PE plastics including HDPE, LDPE, flame-retardant PE, mineral-filled PE and the like and common regenerated PE plastics, prevent the pyrolysis stabilizer from well ensuring good quality and resisting decomposition at normal temperature, ensure the pyrolysis stabilizer to be normally used within a certain time limit, decompose after exceeding the time limit, facilitate environmental protection, prevent the pyrolysis stabilizer and the heat-resistant agent from being added just after mixing and refining to prevent the finished product from being thermally stabilized, and simultaneously realize effective degradation under specific environmental conditions and after exceeding the certain time limit, so that the product cannot be degraded after the service cycle of the product is finished and causes environmental pollution.
The invention also provides a preparation method of the easily degradable light high-strength PE + EPP mixed foaming material, which comprises the following steps:
s1, preparing materials: preparing corresponding raw materials, screening the raw materials to obtain qualified raw materials, weighing the corresponding raw materials according to parts by weight, and ensuring the quality of the raw materials from the source so as to well improve the quality of products;
s2, mixing materials: mixing random copolymerization polypropylene, low-density polyethylene, ethylene propylene diene monomer, titanium dioxide, a modified foaming agent, a co-foaming agent, polyethylene glycol, a toughening agent, a preservative, a photolysis biological enzyme mixed degradation additive, a thermal oxidation degradation auxiliary agent, an odorless cross-linking agent, an antistatic agent, a composite antioxidant and an ACR impact modifier in an internal mixer, firstly adding the random copolymerization polypropylene, the low-density polyethylene, the ethylene propylene diene monomer, the co-foaming agent, the polyethylene glycol, the toughening agent, the preservative and the odorless cross-linking agent into the internal mixer, and mixing until the mixture is uniform; secondly, adding titanium dioxide, a modified foaming agent, a photolysis biological enzyme mixed degradation additive, a thermal oxidation degradation auxiliary agent, a composite antioxidant, an ACR impact modifier, an antistatic agent, a pyrolysis prevention stabilizer and a heat-resistant agent into an internal mixer for mixing, uniformly mixing, and discharging materials, wherein the temperature of the mixed materials is controlled to be 110-;
s3, open mixing: feeding the material discharged from the internal mixer into an open mill for open milling for 3-5 times, wherein the temperature of a front roller is 80-90 ℃, the temperature of a rear roller is 70-80 ℃, the roller spacing is 0.3-0.7 mm;
s4, discharging: the milled material is fed into a sheet discharging machine for processing to obtain a material sheet, and the material sheet is cooled, wherein the temperature of the cooling water is less than or equal to 35 ℃, so that the temperature of the product can be quickly reduced, and the subsequent treatment is convenient;
s5, vulcanization foaming: feeding the material sheet into a flat vulcanizing machine for vulcanization foaming treatment, wherein the pressure is 0.8-0.85MPa, the vulcanization time is 10-30 minutes, and the vulcanization temperature is less than or equal to 180 ℃;
s6, cooling, forming and processing: the tablet that will vulcanize the foaming and handle, after the cooling shaping, the cooling method is the water-cooling, enables product rapid cooling to make things convenient for follow-up staff to handle it, cutting process, installation specification is cut apart it, and guarantees cutting apart the level and smooth of face, gets the finished product, conveniently stores and operates, and the staff of being convenient for uses. Compared with the embodiment 1, the embodiment reduces the quality range of the product, further defines the mass fraction of each material, and is beneficial to improving the quality of the product.
Example 3
An easily degradable light high-strength PE + EPP mixed foaming material comprises the following components in parts by weight: random copolymerized polypropylene: 70 parts of random copolymer improves the shock resistance, increases the flexibility and reduces the melting temperature, thereby also reducing the thermal welding temperature; meanwhile, the chemical stability and the water vapor isolation performance are improved well, and the quality of a final product is improved; low density polyethylene: 75 parts of the polyethylene resin is the lightest variety in the polyethylene resin, has good flexibility, extensibility, electrical insulation, transparency, easy processability and certain air permeability, has good chemical stability, is alkali-resistant and resistant to common organic solvents, and can well reduce the quality of a finished product; ethylene propylene diene monomer: 30 parts of the modified polypropylene material has excellent ozone resistance, heat resistance, weather resistance and other aging resistance, is beneficial to prolonging the service life of the product, and can well enable the product to be used in various environments; titanium dioxide: 3 parts, the final color of the product can be well improved.
In the present invention, the modified blowing agent: 3.5 parts of auxiliary foaming agent: 1.3 parts of modified foaming agent, wherein the modified foaming agent is prepared by mixing 78 parts of azodicarbonamide, 7.5 parts of melamine, 10.5 parts of urea and 2 parts of cerium dioxide by weight, zinc oxide is adopted as the auxiliary foaming agent, the melamine and the urea can be used as foaming auxiliary agents, the decomposition conditions are completely and well controlled in the decomposition process of the azodicarbonamide, the problem of residual ammonia and other harmful gases in the prepared material is solved, the problem that the thermal decomposition temperature range is too narrow and the material pore diameter is not uniform due to sudden decomposition is solved in the foaming process of the azodicarbonamide, the problem is solved, the defect that the processing process is difficult to control by using the azodicarbonamide as the foaming agent is overcome, and the foaming quality is further improved by the zinc oxide.
In the present invention, polyethylene glycol: 3.5 parts of the antistatic agent has excellent lubricating property, moisture retention property, dispersibility, adhesive, antistatic agent and softening agent, can well improve the quality of products, and enables the products to have certain antistatic capability.
In the present invention, the toughening agent: 3 parts of toughening agent, namely mixing 5 parts of polyamide, 6 parts of polyurethane, 5 parts of nano-titanium dioxide, 20 parts of silicone rubber and 13 parts of carboxyl nitrile rubber in parts by weight, so that the flexibility of the product can be well improved, and the mechanical strength, the wear resistance and the corrosion resistance of the product can be improved.
In the present invention, the preservative: 5 parts, promote the anticorrosive ability, increase of service life, photolysis biological enzyme mixed degradation additive: 7.5 parts, so that the product can be rapidly degraded, and after the use period is finished, the product can be degraded into micromolecules or decomposed by microorganisms for a certain time under the illumination condition, and the defects that a common foaming material is difficult to decompose and rot are overcome, so that the environmental protection property of the product can be well improved; 7.5 parts of thermal-oxidative degradation auxiliary agent, wherein the thermal degradation agent is mainly organic peroxide, is heated and decomposed into free radicals to initiate polymer chain degradation, can quickly degrade the product after being heated to a certain temperature, and further improves the environmental protection performance of the product; odorless cross-linking agent: 0.6 part of odorless cross-linking agent is bis-tert-butylperoxyisopropyl benzene, so that the peculiar smell of the product can be reduced; antistatic agent: 1.5 parts of the antioxidant, which is helpful for improving the antistatic capability of the product and the application range of the product, the composite antioxidant is as follows: 1 part, the service life of the equipment is prolonged; ACR impact modifier: 4 parts of ACR impact modifier which is rigid particles can further improve the strength of the product, and the parts by weight are accurate, so that workers can determine and weigh the parts by weight accurately, and the quality of the product is ensured; 4 parts of a pyrolysis preventing stabilizer, a heat-resistant agent: 4 parts of heat-resistant agent, under the condition of small usage amount, the heat distortion temperature and mechanical property of PE plastics including HDPE, LDPE, flame-retardant PE, mineral filled PE and the like and common regenerated PE plastics can be effectively increased, the pyrolysis stabilizer can be prevented from being well guaranteed to have good quality and resist decomposition under the normal temperature condition, the pyrolysis stabilizer can be guaranteed to be normally used within a certain time limit, and can be decomposed after exceeding the time limit, so that the environment is protected, the pyrolysis stabilizer and the heat-resistant agent are prevented from being added just after mixing materials are densely refined, so that the thermal stability of finished products can be prevented from being densely achieved, meanwhile, the products can be effectively degraded under the specific environmental condition and after exceeding the certain time limit, and the phenomena that the products cannot be degraded after the use period is finished and the environmental pollution is caused.
The invention also provides a preparation method of the easily degradable light high-strength PE + EPP mixed foaming material, which comprises the following steps:
s1, preparing materials: preparing corresponding raw materials, screening the raw materials to obtain qualified raw materials, weighing the corresponding raw materials according to parts by weight, and ensuring the quality of the raw materials from the source so as to well improve the quality of products;
s2, mixing materials: mixing random copolymerization polypropylene, low-density polyethylene, ethylene propylene diene monomer, titanium dioxide, a modified foaming agent, a co-foaming agent, polyethylene glycol, a toughening agent, a preservative, a photolysis biological enzyme mixed degradation additive, a thermal oxidation degradation auxiliary agent, an odorless cross-linking agent, an antistatic agent, a composite antioxidant and an ACR impact modifier in an internal mixer, firstly adding the random copolymerization polypropylene, the low-density polyethylene, the ethylene propylene diene monomer, the co-foaming agent, the polyethylene glycol, the toughening agent, the preservative and the odorless cross-linking agent into the internal mixer, and mixing until the mixture is uniform; secondly, adding titanium dioxide, a modified foaming agent, a photolysis biological enzyme mixed degradation additive, a thermal oxidation degradation auxiliary agent, a composite antioxidant, an ACR impact modifier, an antistatic agent, a pyrolysis prevention stabilizer and a heat-resistant agent into an internal mixer, mixing uniformly, and discharging materials, wherein the temperature of the mixed materials is controlled to be 105 ℃, the temperature of cooling water in the internal mixer is 80 ℃, the pressure of compressed air is 0.8MPa, and the materials are discharged when the temperature of the materials is 108 ℃;
s3, open mixing: feeding the materials discharged from the internal mixer into an open mill for open milling, wherein the temperature of a front roller is 85 ℃, the temperature of a rear roller is 75 ℃, the roller spacing is 0.5mm, and the additional milling is carried out for 4 times;
s4, discharging: the milled material is fed into a sheet discharging machine for processing to obtain a material sheet, and the material sheet is cooled, wherein the temperature of the cooling water is less than or equal to 35 ℃, so that the temperature of the product can be quickly reduced, and the subsequent treatment is convenient;
s5, vulcanization foaming: feeding the material sheet into a flat vulcanizing machine for vulcanization foaming treatment, wherein the pressure is 0.8MPa, the vulcanization time is 20 minutes, and the vulcanization temperature is less than or equal to 180 ℃;
s6, cooling, forming and processing: the tablet that will vulcanize foaming processing, after the cooling shaping, the cooling method is the water-cooling, enables product rapid cooling to make things convenient for follow-up staff to handle it, cutting process, the installation specification is cut apart it, and guarantee cutting apart the level and smooth of face, get the finished product, conveniently save and function, the staff of being convenient for uses, each data index in the strict definite production, makes the staff strictly produce according to the index, the quality of promotion product that can be fine.
Compared with the embodiments 1 and 2, the embodiment defines the mass parts of the materials, also defines the required conditions for material treatment, facilitates the operation and control of workers according to numerical values, helps to ensure the stable production of products, and obtains the products by operating the workers according to the embodiment 3, and tests the products to obtain the following results:
combining the tests, the hardness of the foaming material is higher, and the heating size change and the bending test result of the foaming material both meet the use requirements, and the product can well realize normal temperature degradation under the coordination of a thermal oxidation degradation auxiliary agent, a photolysis biological enzyme mixed degradation additive, a pyrolysis prevention stabilizer, a heat-resistant agent and the like through a degradation test, the service cycle of the pyrolysis prevention stabilizer and the heat-resistant agent is prevented from being 3 years, when the service cycle is over, the pyrolysis stabilizer and the heat-resistant agent are prevented from losing activity, so that the thermal-oxidative degradation auxiliary agent and the photolytic biological enzyme mixed degradation additive can start to degrade in the air in the product, the degradation rate can reach more than 95 within 1200 hours at the normal temperature of 18 ℃, or the degradation rate reaches 99% in 20 hours at 60 ℃, or the degradation rate reaches more than 95% in 15 hours at 70 ℃, so that the product can be degraded efficiently after the use period is finished.
In the invention, corresponding raw materials are prepared according to a formula, the raw materials are screened to obtain qualified raw materials, the raw materials with corresponding parts by weight are weighed according to parts by weight, the temperature in the internal mixer is raised to 110 ℃ plus 100 ℃, the cooling water temperature in the internal mixer is controlled to be 75-85 ℃, the compressed air pressure is 0.7-0.9MPa, workers firstly add random copolymerization polypropylene, low-density polyethylene, ethylene propylene diene monomer, foaming aid, polyethylene glycol, toughening agent, preservative and tasteless cross-linking agent into the internal mixer for mixing until the mixture is uniform, then add titanium dioxide, modified foaming agent, photolysis biological enzyme mixed degradation additive, thermal oxidation degradation auxiliary agent, composite antioxidant, ACR impact modifier and antistatic agent into the internal mixer for mixing until the mixture is uniform, discharge the materials when the temperature of the materials is 105 ℃ plus 110 ℃, send the materials into an open mill for mixing, the front roller temperature is 80-90 ℃, the rear roller temperature is 70-80 ℃, the roller spacing is 0.3-0.7mm, the refining is carried out for 3-5 times, the milled material is sent to a sheet discharging machine for processing to obtain a material sheet, the cooling water temperature is less than or equal to 35 ℃, the material sheet is sent to a flat vulcanizing machine for vulcanization foaming treatment, the pressure is 0.8-0.85MPa, the vulcanization time is 10-30 minutes, the vulcanization temperature is less than or equal to 180 ℃, the material sheet subjected to vulcanization foaming treatment is cooled, formed and cut to obtain a finished product.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.
Claims (9)
1. An easily degradable light high-strength PE + EPP mixed foaming material is characterized by comprising the following components in parts by weight: random copolymerized polypropylene: 60-80 parts of low-density polyethylene: 50-100 parts of ethylene propylene diene monomer: 20-40 parts of titanium dioxide: 2-4 parts of modified foaming agent: 1-5 parts of auxiliary foaming agent: 0.1-2 parts of polyethylene glycol: 2-5 parts of a toughening agent: 2-4 parts of preservative: 3-6 parts of photolysis biological enzyme mixed degradation additive: 5-10 parts of thermal oxidation degradation auxiliary agent, 5-10 parts of tasteless cross-linking agent: 0.5-0.7 part of antistatic agent: 1-2 parts of a composite antioxidant: 0.5-1.5 parts of ACR impact modifier: 3-5 parts of a stabilizer for preventing pyrolysis, 3-5 parts of a heat-resistant agent: 3-5 parts.
2. The degradable lightweight high-strength PE + EPP hybrid foam material as claimed in claim 1, wherein: the modified foaming agent is prepared by mixing 60-100 parts by weight of azodicarbonamide, 5-10 parts by weight of melamine, 5-15 parts by weight of urea and 1-3 parts by weight of cerium dioxide, and the assistant foaming agent adopts zinc oxide.
3. The degradable lightweight high-strength PE + EPP hybrid foam material as claimed in claim 1, wherein: the toughening agent is prepared by mixing 4-6 parts of polyamide, 4-8 parts of polyurethane, 4-6 parts of nano-scale titanium dioxide, 10-25 parts of silicone rubber and 10-15 parts of carboxyl nitrile rubber in parts by weight.
4. The degradable lightweight high-strength PE + EPP hybrid foam material as claimed in claim 1, wherein: the odorless cross-linking agent is bis-tert-butylperoxyisopropyl benzene.
5. The degradable lightweight high-strength PE + EPP hybrid foam material as claimed in claim 1, wherein: the ACR impact modifier is a rigid particle.
6. The preparation method of the easily degradable light high-strength PE + EPP mixed foaming material is characterized by comprising the following steps of:
s1, preparing materials: preparing corresponding raw materials, screening the raw materials to obtain qualified raw materials, and weighing the corresponding raw materials according to parts by weight;
s2, mixing materials: mixing random copolymerization polypropylene, low-density polyethylene, ethylene propylene diene monomer, titanium dioxide, a modified foaming agent, a co-foaming agent, polyethylene glycol, a toughening agent, a preservative, a photolysis biological enzyme mixed degradation additive, a thermal oxidation degradation auxiliary agent, an odorless crosslinking agent, an antistatic agent, a composite antioxidant, an ACR impact modifier, a pyrolysis prevention stabilizer and a heat-resistant agent in an internal mixer, cooling the water in the internal mixer to 75-85 ℃, compressing the air to 0.7-0.9MPa, and discharging the materials when the material temperature is 105-110 ℃;
s3, open mixing: feeding the material discharged from the internal mixer into an open mill for open milling for 3-5 times, wherein the temperature of a front roller is 80-90 ℃, the temperature of a rear roller is 70-80 ℃, the roller spacing is 0.3-0.7 mm;
s4, discharging: feeding the milled material into a sheet discharging machine for processing to obtain a material sheet, and cooling, wherein the temperature of cooling water is less than or equal to 35 ℃;
s5, vulcanization foaming: feeding the material sheet into a flat vulcanizing machine for vulcanization foaming treatment, wherein the pressure is 0.8-0.85MPa, the vulcanization time is 10-30 minutes, and the vulcanization temperature is less than or equal to 180 ℃;
s6, cooling, forming and processing: and cooling and forming the vulcanized and foamed material sheet, and cutting to obtain a finished product.
7. The preparation method of the easily degradable light weight high strength PE + EPP mixed foaming material according to claim 6, is characterized in that: in the S2 mixing, firstly, random copolymerization polypropylene, low density polyethylene, ethylene propylene diene monomer, auxiliary foaming agent, polyethylene glycol, toughening agent, preservative and tasteless crosslinking agent are added into an internal mixer to be mixed until the mixture is uniformly mixed; secondly, adding titanium dioxide, a modified foaming agent, a photolysis biological enzyme mixed degradation additive, a thermal oxidation degradation auxiliary agent, a composite antioxidant, an ACR impact modifier, an antistatic agent, a pyrolysis prevention stabilizer and a heat-resistant agent into an internal mixer for mixing, uniformly mixing and discharging materials.
8. The preparation method of the easily degradable light weight high strength PE + EPP mixed foaming material according to claim 6, is characterized in that: the temperature of the mixed material in the S1 is controlled to be 100-110 ℃.
9. The preparation method of the easily degradable light weight high strength PE + EPP mixed foaming material according to claim 6, is characterized in that: the cooling manner in S6 is water cooling.
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| CN108467535A (en) * | 2018-05-29 | 2018-08-31 | 佛山市正道中印包装印刷有限公司 | A kind of degradable PE cotton printed apcksging materials |
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