CN110862641A - High-low temperature resistant food-grade PC pipe and preparation method thereof - Google Patents
High-low temperature resistant food-grade PC pipe and preparation method thereof Download PDFInfo
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Abstract
The invention provides a high-low temperature resistant food-grade PC pipe and a preparation method thereof, and relates to the technical field of plastic processing. The high-temperature and low-temperature resistant food-grade PC pipe is prepared from the following raw materials in parts by weight: 22-26 parts of polycarbonate, 2-4 parts of low-density polyethylene, 6-8 parts of high-density polyethylene, 5-8 parts of acrylic resin, 1-1.4 parts of nano tourmaline powder, 1.2-1.4 parts of white carbon black, 0.6-0.8 part of calcium silicate, 1-1.2 parts of aluminum silicate short fiber, 5-6 parts of phenoxyethanol, 1-1.2 parts of maleic anhydride, 2-3 parts of succinic anhydride, 1-2 parts of 3-methylthiazolidine-2-thioketone, 0.8-1.2 parts of antioxidant, 1-1.4 parts of plasticizer and 4-5 parts of mixed auxiliary agent. The invention overcomes the defects of the prior art, improves the food use safety of the PC pipe, effectively resists high and low temperature, prevents the PC pipe from deforming and aging caused by temperature change, and prolongs the service life of the PC pipe.
Description
Technical Field
The invention relates to the technical field of plastic processing, in particular to a high-temperature and low-temperature resistant food-grade PC pipe and a preparation method thereof.
Background
The plastic is one of basic materials commonly used in daily life of people at present, wherein the polycarbonate is one of common engineering plastics commonly used in daily life due to excellent properties of insulation, extension, chemical corrosion resistance, high temperature resistance, severe cold resistance, flame retardance, impact resistance and the like.
Generally, when engineering plastics are modified, the application range of the engineering plastics is required to be determined firstly, and when the plastic products are used in the food industry, the safety and the environmental protection of the formula are primarily considered in the process of compounding the components of the plastic products so as to prevent the plastic materials from influencing the safety of foods and causing certain hidden troubles to the health of people.
When the PC pipe is prepared into a wine gun (beer jar) and various food storage PC pipes, the safety of the PC pipe is particularly required to be noticed, and meanwhile, when some foods are stored at an excessively high temperature or stored at a low temperature, the traditional plastic storage device is influenced, the service life of the storage device is shortened, and in order to meet daily requirements, the development of a high-temperature and low-temperature resistant food grade PC pipe is crucial.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides the high-low temperature resistant food-grade PC pipe and the preparation method thereof, so that the food use safety of the PC pipe is improved, the high-low temperature is effectively resistant, the deformation and aging of the PC pipe caused by temperature change are prevented, and the service life of the PC pipe is prolonged.
In order to achieve the above purpose, the technical scheme of the invention is realized by the following technical scheme:
the high and low temperature resistant food grade PC pipe is prepared from the following raw materials in parts by weight: 22-26 parts of polycarbonate, 2-4 parts of low-density polyethylene, 6-8 parts of high-density polyethylene, 5-8 parts of acrylic resin, 1-1.4 parts of nano tourmaline powder, 1.2-1.4 parts of white carbon black, 0.6-0.8 part of calcium silicate, 1-1.2 parts of aluminum silicate short fiber, 5-6 parts of phenoxyethanol, 1-1.2 parts of maleic anhydride, 2-3 parts of succinic anhydride, 1-2 parts of 3-methylthiazolidine-2-thioketone, 0.8-1.2 parts of antioxidant, 1-1.4 parts of plasticizer and 4-5 parts of mixed auxiliary agent.
Preferably, the antioxidant is a mixture of 2, 6-di-tert-butyl-4-methylphenol, thiodipropionic acid and dibutyl hydroxy toluene in a mass ratio of 2: 5.
Preferably, the plasticizer is prepared by mixing one or more of citrate plasticizers.
Preferably, the mixing aid is prepared from the following raw materials in parts by weight: 16-18 parts of epoxidized soybean oil, 4-5 parts of triethanolamine, 2-4 parts of hydroxyethyl cellulose, 3-4 parts of chitosan, 1-2 parts of N, N-dimethyldecanamide, 1-1.6 parts of isocyanatopropyltriethoxysilane, 2-3 parts of gamma-aminopropyltriethoxysilane and 1-1.6 parts of benzotriazol-1-yl-oxytripyrrolidinylphosphine hexafluorophosphate; the preparation method mainly comprises the following steps:
(1) preheating epoxidized soybean oil to 50-60 ℃, adding hydroxyethyl cellulose, chitosan, isopropyltriethoxysilane isocyanate and gamma-aminopropyltriethoxysilane, and stirring for 15-20min at the rotation speed of 150r/min by using a stirrer to obtain a mixed solution for later use;
(2) uniformly mixing triethanolamine, N-dimethyldecanamide and benzotriazole-1-yl-oxytripyrrolidinyl phosphorus hexafluorophosphate, and standing at 40-50 deg.C under 15-20MPa for 2-3 hr to obtain mixture;
(3) and adding the mixture into the mixed solution, and homogenizing for 2-3 times in an ultrasonic homogenizer to obtain the mixed auxiliary agent for later use.
The preparation method of the high-temperature and low-temperature resistant food-grade PC pipe comprises the following steps:
(1) modification treatment: mixing polycarbonate and low-density polyethylene, adding maleic anhydride, boosting the pressure to 18-20MPa in a high-pressure reaction kettle, uniformly stirring at the high temperature of 190 ℃ under 180 ℃, and then carrying out heat preservation modification grafting for 60-80min to obtain a modified material for later use;
(2) mechanical mixing: mixing high-density polyethylene and acrylic resin, heating to 250-260 ℃, stirring in a stirrer at the rotating speed of 600r/min for 20-22min, adding the modified material and the mixing aid, adjusting the temperature to 230 ℃ and the rotating speed to 800-900r/min, and stirring for 2-2.5h at a constant temperature to obtain a mixed material for later use;
(3) mixing microwaves: mixing the nano tourmaline powder, the white carbon black, the succinic anhydride and the calcium silicate, adding deionized water with 2 times of volume, uniformly stirring, and treating for 3-4min in an environment with the microwave power of 100-120W and the temperature of 80-85 ℃ to obtain a mixture for later use;
(4) and (3) mixing auxiliary materials: mixing aluminum silicate short fibers, phenoxyethanol and 3-methylthiazolidine-2-thione, adding the treatment liquid and a plasticizer, heating to 60-80 ℃, uniformly stirring while keeping the temperature, freeze-drying at low temperature, and grinding into powder to obtain mixed auxiliary materials for later use;
(5) mixing and molding: mixing the mixture with the mixed auxiliary materials and the antioxidant, placing the mixture in a mixing roll, firstly carrying out heat preservation mixing within a temperature range of 180 ℃ plus materials and 190 ℃ for 20-30min, then carrying out mixing within a temperature range of 220 ℃ plus materials and 230 ℃ for 30-40min, then carrying out mixing within a temperature range of 230 ℃ plus materials and 250 ℃ for 20-30min, then carrying out mixing within a temperature range of 210 ℃ plus materials and 220 ℃ for 30-40min, and finally carrying out mixing within a temperature range of 190 ℃ plus materials and 200 ℃ for 20-25min, and placing the mixture in a forming machine for forming to obtain the high-low temperature resistant food-grade PC tube.
Preferably, the modification treatment in step (1) is performed in a nitrogen atmosphere.
Preferably, in the process of stirring for 2-2.5h under heat preservation in the step (2), standing for 25-30min for inoculation after stirring for 30min, and then continuing stirring.
Preferably, the auxiliary materials mixed in the step (4) are sieved by a 120-mesh sieve.
The invention provides a high and low temperature resistant food-grade PC pipe and a preparation method thereof, and compared with the prior art, the high and low temperature resistant food-grade PC pipe has the advantages that:
(1) according to the invention, polycarbonate, low-density polyethylene, high-density polyethylene and acrylic resin are used as main base materials, and nano tourmaline powder, white carbon black, calcium silicate and aluminum silicate short fibers are added and mixed, so that the mechanical property of the prepared PC pipe is further improved, and the impact resistance of the PC pipe is further enhanced under the condition of ensuring the high temperature resistance of the PC pipe.
(2) According to the invention, substances such as phenoxyethanol, maleic anhydride, succinic anhydride, 3-methylthiazolidine-2-thioketone, an antioxidant, a plasticizer, a mixing aid and the like are added, so that the oxidation resistance and high and low temperature resistance of the PC pipe are effectively improved, and meanwhile, the raw materials are safe and environment-friendly after being mixed, and toxic substances are generated, so that the PC pipe meets the food safety standard.
(3) According to the invention, plastic resin components are mixed and grafted, so that the stability of the raw materials is effectively improved, meanwhile, part of filler is subjected to microwave treatment and then mixed and ground, the dispersibility of the filler in the base material is effectively improved, the uniformity of substance mixing is improved, and the stress of the product is reduced and the mechanical property of the product is improved by adopting multi-stage temperature mixing.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention are clearly and completely described below in conjunction with the embodiments of the present invention, and it is obvious that the described embodiments are some embodiments of the present invention, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1:
the high and low temperature resistant food grade PC pipe is prepared from the following raw materials in parts by weight: 22 parts of polycarbonate, 2 parts of low-density polyethylene, 6 parts of high-density polyethylene, 5 parts of acrylic resin, 1 part of nano tourmaline powder, 1.2 parts of white carbon black, 0.6 part of calcium silicate, 1 part of aluminum silicate short fiber, 5 parts of phenoxyethanol, 1 part of maleic anhydride, 2 parts of succinic anhydride, 1 part of 3-methylthiazolidine-2-thione, 0.8 part of antioxidant, 1 part of plasticizer and 4 parts of mixing aid.
The antioxidant is a mixture of 2, 6-di-tert-butyl-4-methylphenol, thiodipropionic acid and dibutyl hydroxy toluene in a mass ratio of 2: 5; the plasticizer is prepared by mixing one or more of citrate plasticizers; the mixed auxiliary agent is prepared from the following raw materials in parts by weight: 16 parts of epoxidized soybean oil, 4 parts of triethanolamine, 2 parts of hydroxyethyl cellulose, 3 parts of chitosan, 1 part of N, N-dimethyldecanamide, 1 part of isocyanatopropyltriethoxysilane, 2 parts of gamma-aminopropyltriethoxysilane and 1 part of benzotriazol-1-yl-oxytripyrrolidinyl phosphorus hexafluorophosphate; the preparation method mainly comprises the following steps:
(1) preheating epoxidized soybean oil to 50-60 ℃, adding hydroxyethyl cellulose, chitosan, isopropyltriethoxysilane isocyanate and gamma-aminopropyltriethoxysilane, and stirring for 15-20min at the rotation speed of 150r/min by using a stirrer to obtain a mixed solution for later use;
(2) uniformly mixing triethanolamine, N-dimethyldecanamide and benzotriazole-1-yl-oxytripyrrolidinyl phosphorus hexafluorophosphate, and standing at 40-50 deg.C under 15-20MPa for 2-3 hr to obtain mixture;
(3) and adding the mixture into the mixed solution, and homogenizing for 2-3 times in an ultrasonic homogenizer to obtain the mixed auxiliary agent for later use.
The preparation method of the high-temperature and low-temperature resistant food-grade PC pipe comprises the following steps:
(1) modification treatment: mixing polycarbonate and low-density polyethylene, adding maleic anhydride, boosting the pressure to 18-20MPa in a high-pressure reaction kettle, uniformly stirring at the high temperature of 190 ℃ under 180 ℃, and then carrying out heat preservation modification grafting for 60-80min to obtain a modified material for later use;
(2) mechanical mixing: mixing high-density polyethylene and acrylic resin, heating to 250-260 ℃, stirring in a stirrer at the rotating speed of 600r/min for 20-22min, adding the modified material and the mixing aid, adjusting the temperature to 230 ℃ and the rotating speed to 800-900r/min, and stirring for 2-2.5h at a constant temperature to obtain a mixed material for later use;
(3) mixing microwaves: mixing the nano tourmaline powder, the white carbon black, the succinic anhydride and the calcium silicate, adding deionized water with 2 times of volume, uniformly stirring, and treating for 3-4min in an environment with the microwave power of 100-120W and the temperature of 80-85 ℃ to obtain a mixture for later use;
(4) and (3) mixing auxiliary materials: mixing aluminum silicate short fibers, phenoxyethanol and 3-methylthiazolidine-2-thione, adding the treatment liquid and a plasticizer, heating to 60-80 ℃, uniformly stirring while keeping the temperature, freeze-drying at low temperature, and grinding into powder to obtain mixed auxiliary materials for later use;
(5) mixing and molding: mixing the mixture with the mixed auxiliary materials and the antioxidant, placing the mixture in a mixing roll, firstly carrying out heat preservation mixing within a temperature range of 180 ℃ plus materials and 190 ℃ for 20-30min, then carrying out mixing within a temperature range of 220 ℃ plus materials and 230 ℃ for 30-40min, then carrying out mixing within a temperature range of 230 ℃ plus materials and 250 ℃ for 20-30min, then carrying out mixing within a temperature range of 210 ℃ plus materials and 220 ℃ for 30-40min, and finally carrying out mixing within a temperature range of 190 ℃ plus materials and 200 ℃ for 20-25min, and placing the mixture in a forming machine for forming to obtain the high-low temperature resistant food-grade PC tube.
Wherein, the modification treatment in the step (1) needs to be carried out in the atmosphere of nitrogen; in the process of stirring for 2-2.5h under heat preservation in the step (2), standing for 25-30min for inoculation after stirring for 30min, and continuing stirring; and (4) sieving the mixed auxiliary materials in the step (4) by a 120-mesh sieve.
Example 2:
the high and low temperature resistant food grade PC pipe is prepared from the following raw materials in parts by weight: 26 parts of polycarbonate, 4 parts of low-density polyethylene, 8 parts of high-density polyethylene, 8 parts of acrylic resin, 1.4 parts of nano tourmaline powder, 1.4 parts of white carbon black, 0.8 part of calcium silicate, 1.2 parts of short aluminum silicate fibers, 6 parts of phenoxyethanol, 1.2 parts of maleic anhydride, 3 parts of succinic anhydride, 2 parts of 3-methylthiazolidine-2-thione, 1.2 parts of antioxidant, 1.4 parts of plasticizer and 5 parts of mixed assistant.
The antioxidant is a mixture of 2, 6-di-tert-butyl-4-methylphenol, thiodipropionic acid and dibutyl hydroxy toluene in a mass ratio of 2: 5; the plasticizer is prepared by mixing one or more of citrate plasticizers; the mixed auxiliary agent is prepared from the following raw materials in parts by weight: 18 parts of epoxidized soybean oil, 5 parts of triethanolamine, 4 parts of hydroxyethyl cellulose, 4 parts of chitosan, 2 parts of N, N-dimethyldecanamide, 1.6 parts of isopropyltriethoxysilane isocyanate, 3 parts of gamma-aminopropyltriethoxysilane and 1.6 parts of benzotriazole-1-yl-oxytripyrrolidinylphosphine hexafluorophosphate; the preparation method mainly comprises the following steps:
(1) preheating epoxidized soybean oil to 50-60 ℃, adding hydroxyethyl cellulose, chitosan, isopropyltriethoxysilane isocyanate and gamma-aminopropyltriethoxysilane, and stirring for 15-20min at the rotation speed of 150r/min by using a stirrer to obtain a mixed solution for later use;
(2) uniformly mixing triethanolamine, N-dimethyldecanamide and benzotriazole-1-yl-oxytripyrrolidinyl phosphorus hexafluorophosphate, and standing at 40-50 deg.C under 15-20MPa for 2-3 hr to obtain mixture;
(3) and adding the mixture into the mixed solution, and homogenizing for 2-3 times in an ultrasonic homogenizer to obtain the mixed auxiliary agent for later use.
The preparation method of the high-temperature and low-temperature resistant food-grade PC pipe comprises the following steps:
(1) modification treatment: mixing polycarbonate and low-density polyethylene, adding maleic anhydride, boosting the pressure to 18-20MPa in a high-pressure reaction kettle, uniformly stirring at the high temperature of 190 ℃ under 180 ℃, and then carrying out heat preservation modification grafting for 60-80min to obtain a modified material for later use;
(2) mechanical mixing: mixing high-density polyethylene and acrylic resin, heating to 250-260 ℃, stirring in a stirrer at the rotating speed of 600r/min for 20-22min, adding the modified material and the mixing aid, adjusting the temperature to 230 ℃ and the rotating speed to 800-900r/min, and stirring for 2-2.5h at a constant temperature to obtain a mixed material for later use;
(3) mixing microwaves: mixing the nano tourmaline powder, the white carbon black, the succinic anhydride and the calcium silicate, adding deionized water with 2 times of volume, uniformly stirring, and treating for 3-4min in an environment with the microwave power of 100-120W and the temperature of 80-85 ℃ to obtain a mixture for later use;
(4) and (3) mixing auxiliary materials: mixing aluminum silicate short fibers, phenoxyethanol and 3-methylthiazolidine-2-thione, adding the treatment liquid and a plasticizer, heating to 60-80 ℃, uniformly stirring while keeping the temperature, freeze-drying at low temperature, and grinding into powder to obtain mixed auxiliary materials for later use;
(5) mixing and molding: mixing the mixture with the mixed auxiliary materials and the antioxidant, placing the mixture in a mixing roll, firstly carrying out heat preservation mixing within a temperature range of 180 ℃ plus materials and 190 ℃ for 20-30min, then carrying out mixing within a temperature range of 220 ℃ plus materials and 230 ℃ for 30-40min, then carrying out mixing within a temperature range of 230 ℃ plus materials and 250 ℃ for 20-30min, then carrying out mixing within a temperature range of 210 ℃ plus materials and 220 ℃ for 30-40min, and finally carrying out mixing within a temperature range of 190 ℃ plus materials and 200 ℃ for 20-25min, and placing the mixture in a forming machine for forming to obtain the high-low temperature resistant food-grade PC tube.
Wherein, the modification treatment in the step (1) needs to be carried out in the atmosphere of nitrogen; in the process of stirring for 2-2.5h under heat preservation in the step (2), standing for 25-30min for inoculation after stirring for 30min, and continuing stirring; and (4) sieving the mixed auxiliary materials in the step (4) by a 120-mesh sieve.
Example 3:
the high and low temperature resistant food grade PC pipe is prepared from the following raw materials in parts by weight: 24 parts of polycarbonate, 3 parts of low-density polyethylene, 7 parts of high-density polyethylene, 6.5 parts of acrylic resin, 1.2 parts of nano tourmaline powder, 1.3 parts of white carbon black, 0.7 part of calcium silicate, 1 part of short aluminum silicate fibers, 5.5 parts of phenoxyethanol, 1.1 parts of maleic anhydride, 2.5 parts of succinic anhydride, 1.5 parts of 3-methylthiazolidine-2-thioketone, 1 part of antioxidant, 1.2 parts of plasticizer and 4.5 parts of mixing aid.
The antioxidant is a mixture of 2, 6-di-tert-butyl-4-methylphenol, thiodipropionic acid and dibutyl hydroxy toluene in a mass ratio of 2: 5; the plasticizer is prepared by mixing one or more of citrate plasticizers; the mixed auxiliary agent is prepared from the following raw materials in parts by weight: 17 parts of epoxidized soybean oil, 4.5 parts of triethanolamine, 3 parts of hydroxyethyl cellulose, 3.5 parts of chitosan, 1.5 parts of N, N-dimethyldecanamide, 1.3 parts of isocyanatopropyltriethoxysilane, 2.5 parts of gamma-aminopropyltriethoxysilane and 1.3 parts of benzotriazol-1-yl-oxytripyrrolidinylphosphine hexafluorophosphate; the preparation method mainly comprises the following steps:
(1) preheating epoxidized soybean oil to 50-60 ℃, adding hydroxyethyl cellulose, chitosan, isopropyltriethoxysilane isocyanate and gamma-aminopropyltriethoxysilane, and stirring for 15-20min at the rotation speed of 150r/min by using a stirrer to obtain a mixed solution for later use;
(2) uniformly mixing triethanolamine, N-dimethyldecanamide and benzotriazole-1-yl-oxytripyrrolidinyl phosphorus hexafluorophosphate, and standing at 40-50 deg.C under 15-20MPa for 2-3 hr to obtain mixture;
(3) and adding the mixture into the mixed solution, and homogenizing for 2-3 times in an ultrasonic homogenizer to obtain the mixed auxiliary agent for later use.
The preparation method of the high-temperature and low-temperature resistant food-grade PC pipe comprises the following steps:
(1) modification treatment: mixing polycarbonate and low-density polyethylene, adding maleic anhydride, boosting the pressure to 18-20MPa in a high-pressure reaction kettle, uniformly stirring at the high temperature of 190 ℃ under 180 ℃, and then carrying out heat preservation modification grafting for 60-80min to obtain a modified material for later use;
(2) mechanical mixing: mixing high-density polyethylene and acrylic resin, heating to 250-260 ℃, stirring in a stirrer at the rotating speed of 600r/min for 20-22min, adding the modified material and the mixing aid, adjusting the temperature to 230 ℃ and the rotating speed to 800-900r/min, and stirring for 2-2.5h at a constant temperature to obtain a mixed material for later use;
(3) mixing microwaves: mixing the nano tourmaline powder, the white carbon black, the succinic anhydride and the calcium silicate, adding deionized water with 2 times of volume, uniformly stirring, and treating for 3-4min in an environment with the microwave power of 100-120W and the temperature of 80-85 ℃ to obtain a mixture for later use;
(4) and (3) mixing auxiliary materials: mixing aluminum silicate short fibers, phenoxyethanol and 3-methylthiazolidine-2-thione, adding the treatment liquid and a plasticizer, heating to 60-80 ℃, uniformly stirring while keeping the temperature, freeze-drying at low temperature, and grinding into powder to obtain mixed auxiliary materials for later use;
(5) mixing and molding: mixing the mixture with the mixed auxiliary materials and the antioxidant, placing the mixture in a mixing roll, firstly carrying out heat preservation mixing within a temperature range of 180 ℃ plus materials and 190 ℃ for 20-30min, then carrying out mixing within a temperature range of 220 ℃ plus materials and 230 ℃ for 30-40min, then carrying out mixing within a temperature range of 230 ℃ plus materials and 250 ℃ for 20-30min, then carrying out mixing within a temperature range of 210 ℃ plus materials and 220 ℃ for 30-40min, and finally carrying out mixing within a temperature range of 190 ℃ plus materials and 200 ℃ for 20-25min, and placing the mixture in a forming machine for forming to obtain the high-low temperature resistant food-grade PC tube.
Wherein, the modification treatment in the step (1) needs to be carried out in the atmosphere of nitrogen; in the process of stirring for 2-2.5h under heat preservation in the step (2), standing for 25-30min for inoculation after stirring for 30min, and continuing stirring; and (4) sieving the mixed auxiliary materials in the step (4) by a 120-mesh sieve.
Example 4:
the safety of the products obtained in the above examples 1 to 3 was checked:
the PC tubes obtained in the above examples 1 to 3 were tested according to the hygienic standards of GB 14942-:
table 1: PC tube safety detection standard
Example 5:
the PC pipes obtained in the above examples 1 to 3 were tested for their high and low temperature resistance:
(1) selecting the PC pipe obtained in the above examples 1-3 as an experimental group material, and selecting a common PC material as a control group material;
(2) the pipes of the experimental group and the control group were prepared into a plurality of specimen strips of 126X 12.7X 3.2mm according to the ASTM D256 (cantilever beam), and the impact strength of each specimen strip was measured after leaving at-20 deg.C, -10 deg.C, -25 deg.C, -60 deg.C, and 100 deg.C for 48 hours, and the results are shown in the following Table 2:
table 2: impact strength of PC pipe
The table shows that the PC pipe prepared by the invention has good cold-resistant and heat-resistant functions.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (8)
1. The high and low temperature resistant food-grade PC pipe is characterized by being prepared from the following raw materials in parts by weight: 22-26 parts of polycarbonate, 2-4 parts of low-density polyethylene, 6-8 parts of high-density polyethylene, 5-8 parts of acrylic resin, 1-1.4 parts of nano tourmaline powder, 1.2-1.4 parts of white carbon black, 0.6-0.8 part of calcium silicate, 1-1.2 parts of aluminum silicate short fiber, 5-6 parts of phenoxyethanol, 1-1.2 parts of maleic anhydride, 2-3 parts of succinic anhydride, 1-2 parts of 3-methylthiazolidine-2-thioketone, 0.8-1.2 parts of antioxidant, 1-1.4 parts of plasticizer and 4-5 parts of mixed auxiliary agent.
2. The high and low temperature resistant food grade PC pipe according to claim 1, wherein: the antioxidant is a mixture of 2, 6-di-tert-butyl-4-methylphenol, thiodipropionic acid and dibutyl hydroxy toluene in a mass ratio of 2: 5.
3. The high and low temperature resistant food grade PC pipe according to claim 1, wherein: the plasticizer is prepared by mixing one or more of citrate plasticizers.
4. The high and low temperature resistant food grade PC pipe according to claim 1, wherein the mixing aid comprises the following raw materials in parts by weight: 16-18 parts of epoxidized soybean oil, 4-5 parts of triethanolamine, 2-4 parts of hydroxyethyl cellulose, 3-4 parts of chitosan, 1-2 parts of N, N-dimethyldecanamide, 1-1.6 parts of isocyanatopropyltriethoxysilane, 2-3 parts of gamma-aminopropyltriethoxysilane and 1-1.6 parts of benzotriazol-1-yl-oxytripyrrolidinylphosphine hexafluorophosphate; the preparation method mainly comprises the following steps:
(1) preheating epoxidized soybean oil to 50-60 ℃, adding hydroxyethyl cellulose, chitosan, isopropyltriethoxysilane isocyanate and gamma-aminopropyltriethoxysilane, and stirring for 15-20min at the rotation speed of 150r/min by using a stirrer to obtain a mixed solution for later use;
(2) uniformly mixing triethanolamine, N-dimethyldecanamide and benzotriazole-1-yl-oxytripyrrolidinyl phosphorus hexafluorophosphate, and standing at 40-50 deg.C under 15-20MPa for 2-3 hr to obtain mixture;
(3) and adding the mixture into the mixed solution, and homogenizing for 2-3 times in an ultrasonic homogenizer to obtain the mixed auxiliary agent for later use.
5. A preparation method of a high-temperature and low-temperature resistant food-grade PC pipe is characterized by comprising the following steps: the preparation method of the high-temperature and low-temperature resistant food-grade PC pipe comprises the following steps:
(1) modification treatment: mixing polycarbonate and low-density polyethylene, adding maleic anhydride, boosting the pressure to 18-20MPa in a high-pressure reaction kettle, uniformly stirring at the high temperature of 190 ℃ under 180 ℃, and then carrying out heat preservation modification grafting for 60-80min to obtain a modified material for later use;
(2) mechanical mixing: mixing high-density polyethylene and acrylic resin, heating to 250-260 ℃, stirring in a stirrer at the rotating speed of 600r/min for 20-22min, adding the modified material and the mixing aid, adjusting the temperature to 230 ℃ and the rotating speed to 800-900r/min, and stirring for 2-2.5h at a constant temperature to obtain a mixed material for later use;
(3) mixing microwaves: mixing the nano tourmaline powder, the white carbon black, the succinic anhydride and the calcium silicate, adding deionized water with 2 times of volume, uniformly stirring, and treating for 3-4min in an environment with the microwave power of 100-120W and the temperature of 80-85 ℃ to obtain a mixture for later use;
(4) and (3) mixing auxiliary materials: mixing aluminum silicate short fibers, phenoxyethanol and 3-methylthiazolidine-2-thione, adding the treatment liquid and a plasticizer, heating to 60-80 ℃, uniformly stirring while keeping the temperature, freeze-drying at low temperature, and grinding into powder to obtain mixed auxiliary materials for later use;
(5) mixing and molding: mixing the mixture with the mixed auxiliary materials and the antioxidant, placing the mixture in a mixing roll, firstly carrying out heat preservation mixing within a temperature range of 180 ℃ plus materials and 190 ℃ for 20-30min, then carrying out mixing within a temperature range of 220 ℃ plus materials and 230 ℃ for 30-40min, then carrying out mixing within a temperature range of 230 ℃ plus materials and 250 ℃ for 20-30min, then carrying out mixing within a temperature range of 210 ℃ plus materials and 220 ℃ for 30-40min, and finally carrying out mixing within a temperature range of 190 ℃ plus materials and 200 ℃ for 20-25min, and placing the mixture in a forming machine for forming to obtain the high-low temperature resistant food-grade PC tube.
6. The preparation method of the high and low temperature resistant food grade PC pipe according to claim 5, characterized in that: the modification treatment in the step (1) needs to be performed in a nitrogen atmosphere.
7. The preparation method of the high and low temperature resistant food grade PC pipe according to claim 5, characterized in that: in the process of stirring for 2-2.5h under heat preservation in the step (2), standing for 25-30min for inoculation after stirring for 30min, and then continuing stirring.
8. The preparation method of the high and low temperature resistant food grade PC pipe according to claim 5, characterized in that: and (4) sieving the mixed auxiliary materials in the step (4) by a 120-mesh sieve.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN116925516A (en) * | 2023-08-17 | 2023-10-24 | 韦尔通科技股份有限公司 | High-temperature-resistant and low-temperature-resistant bio-based hot melt adhesive pipe and preparation method thereof |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN116925516A (en) * | 2023-08-17 | 2023-10-24 | 韦尔通科技股份有限公司 | High-temperature-resistant and low-temperature-resistant bio-based hot melt adhesive pipe and preparation method thereof |
| CN116925516B (en) * | 2023-08-17 | 2024-02-09 | 韦尔通科技股份有限公司 | High-temperature-resistant and low-temperature-resistant bio-based hot melt adhesive pipe and preparation method thereof |
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Application publication date: 20200306 |