CN114989530A - Anti-aging PP plastic and preparation method thereof - Google Patents
Anti-aging PP plastic and preparation method thereof Download PDFInfo
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Abstract
The invention discloses an anti-aging PP plastic and a preparation method thereof, and the anti-aging PP plastic mainly comprises the following raw materials: 80-100 parts of polypropylene, 9-13 parts of plant fiber, 4-8 parts of an antibacterial agent, 1-4 parts of a heat stabilizer, 1-5 parts of a dispersing agent, 5-7 parts of a cross-linking agent and 2-6 parts of a composite algae extract. The invention discovers that the anti-aging effect can be effectively achieved by adding the composite algae extract into the polypropylene plastic, and the decay of free radicals participating in oxidation in the plastic is hindered by the activity of the composite algae extract. Especially, when plastics are influenced by photoaging, the composite algae extract can be promoted to be converted into a substructure with a shielding and protecting function from an initial structure by illumination, and meanwhile, the stability of the composite algae extract is better than that of other natural oxidants and is not easy to degrade. Compared with the prior art, the PP plastic prepared by the formula has good ageing resistance, toughness and antibacterial activity.
Description
Technical Field
The invention relates to the technical field of plastic preparation, in particular to an anti-aging PP plastic and a preparation method thereof.
Background
Polypropylene (PP) is one of the fastest growing types of general-purpose thermoplastics, compared with other general-purpose plastics, PP has the advantages of wide raw material sources, low cost, simple forming and processing, low density and other good general-purpose properties, no toxicity, excellent processing property, good heat resistance, capability of being used for a long time at the temperature of 110-120 ℃, higher yield, tensile strength, elastic modulus, good electrical insulation property, excellent stress cracking resistance and chemical resistance, and is widely applied to the fields of chemical industry, food, packaging, building materials, medicines, automobiles and the like, and the aspect of daily life of people is covered.
Although polypropylene is widely developed and applied in many fields, the molecular chain structure of polypropylene is susceptible to yellowing and stickiness in appearance, mechanical property reduction and the like under the influence of light (ultraviolet rays), heat and oxygen, and the weather resistance and wear resistance of polypropylene are poor under low temperature conditions, so that the application range and development prospect of polypropylene are limited. Therefore, the research on the modification and the ageing resistance of the polypropylene is indispensable for expanding the application range of the polypropylene.
The aging of polypropylene is a phenomenon that chemical components and physical structures are obviously changed and performances are correspondingly weakened under the combined action of light, heat, chemical catalysis and the like in the processes of manufacturing, storing, conveying, utilizing and the like. Among them, light and heat are two factors that have a dominant effect on aging of polypropylene, which are called photo-oxidative aging and thermo-oxidative aging, respectively, and both of them can cause polypropylene to automatically undergo a catalytic oxidation reaction. The polypropylene has four main changes in aging, namely changes in appearance, physical properties, mechanical properties and electrical properties, so that the polypropylene is greatly limited to be used outdoors.
The antioxidant is a substance capable of reducing the side effect of oxygen, and can capture and neutralize free radicals, reduce subsequent damage of the free radicals and prolong the service life of the free radicals. The main mechanism of action is that the antioxidant reduces the oxygen content through reduction reaction, combines with peroxide generated by oxidation reaction before the polymer, and interrupts chain reaction. The method for improving the anti-aging capability of PP by adding the antioxidant is the most common method at present, and people carry out extensive research on the method in recent years, and the method is mainly divided into synthetic antioxidants and natural antioxidants. Researches show that the PP improves the oxidation induction time and the oxidation induction temperature after adding the hydroxytyrosol, and shows better oxidation resistance. However, chemically synthesized antioxidants have high preparation cost, and organic substances involved in the experimental process can also cause harm and pollution to human bodies and the environment.
Chinese patent CN 103881237A discloses an anti-aging polypropylene plastic, which is composed of the following raw material components in parts by weight: 100 parts of polypropylene, 10100.4-0.6 part of antioxidant, 0.1-0.3 part of light stabilizer, 0.2-0.3 part of ultraviolet absorbent, 36-40 parts of carbon black, 2-4 parts of nano titanium dioxide, 12-16 parts of epoxy resin, 15-20 parts of melamine, 0.2-0.6 part of dispersant and 0.5-0.8 part of coupling agent. The nano titanium dioxide is added into the anti-aging polypropylene plastic, and the nano titanium dioxide has good dispersibility in the polypropylene plastic; melamine is added into the anti-aging polypropylene plastic, so that the polypropylene plastic prepared by the invention has flame retardant property and meets the outdoor use requirement; the polypropylene plastic prepared by the method has good impact resistance, ageing resistance and toughness.
Chinese patent CN 104327381A discloses a novel durable anti-aging polypropylene plastic, which is prepared from 60-120 parts of polypropylene copolymer, 0.3-0.5 part of antioxidant, 10-15 parts of epoxy resin, 6-9 parts of compatilizer, 0.15-0.35 part of ultraviolet absorbent, 0.3-0.5 part of dispersant, 1.5-2.5 parts of assistant, 16-20 parts of melamine and 0.15-0.25 part of light stabilizer. The melamine is added into the novel durable anti-aging polypropylene plastic, so that the prepared polypropylene plastic has good anti-aging and flame retardant properties, and also has the advantages of good wear resistance, heat resistance, chemical resistance, environmental protection and the like; simple production process, convenient processing and forming, easily obtained materials and low cost. However, most antioxidants in the prior art cause serious environmental pollution, and part of natural antioxidants are not well compatible with polypropylene, so that it is very important to develop a green and environment-friendly PP plastic with good aging resistance.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides an anti-aging PP plastic and a preparation method thereof. The specific technical scheme is as follows:
an anti-aging PP plastic comprises the following raw materials in parts by weight:
80-100 parts of polypropylene, 9-13 parts of plant fiber, 4-8 parts of an antibacterial agent, 1-4 parts of a heat stabilizer, 1-5 parts of a dispersing agent and 5-7 parts of a cross-linking agent.
The plant fiber generally comprises 3 types of woody fiber, herbaceous fiber and vine fiber. The recovery rate of the plant fiber is low, and a lot of plant fiber can be burned, thereby not only polluting the ecological environment, but also wasting resources; on the other hand, the modern society puts forward higher requirements on plastic materials, such as cost reduction, improvement of self-insufficient performance and the like. Therefore, a limited variety of single plastics are compounded into various novel composite materials, so as to meet various requirements.
The plant fiber is one of jute fiber and corn straw fiber.
The antibacterial agent is one of N- (trichloromethylthio) phthalimide, ascorbyl stearate and butyl hydroxy anisol.
The heat stabilizer is one of propylene oxide and calcium isooctanoate.
The dispersing agent is one or more of stearic acid, polyethylene wax, liquid paraffin and polyethylene glycol.
The cross-linking agent is diethylaminopropylamine.
Further, the anti-aging PP plastic comprises the following raw materials in parts by weight:
80-100 parts of polypropylene, 9-13 parts of plant fiber, 4-8 parts of an antibacterial agent, 1-4 parts of a heat stabilizer, 1-5 parts of a dispersing agent, 5-7 parts of a cross-linking agent and 2-6 parts of a composite algae extract.
The service life of polypropylene plastics is essentially determined by their oxidation resistance, so that the addition of an oxidation protective agent is often required in the preparation of polypropylene plastics, but many natural oxidation protective agents are the focus of research in terms of environmental protection and low pollution. Algae are an important source of natural active ingredients. Scientists have long studied the biological activity of natural compounds of algae. The active ingredients of algae can be roughly divided into two categories: one class is mainly the viscous polysaccharides; the other class has small molecular weight and mainly comprises lipids, phenols, terpenes, alkaloids, carotenoids and the like. Almost all plants, including seaweeds, etc., which are photosynthesized are exposed to an environment of high light intensity and high oxygen concentration, inevitably suffer from strong oxidative stress, resulting in the formation of free radicals, but they are rarely severely oxidatively damaged in metabolism. This fact shows that there must be some protective antioxidant mechanism and the presence of natural antioxidant active ingredients in their cells.
Further, the composite algae extract is formed by mixing a sargassum henslowianum extract and spirulina platensis powder.
Preferably, the composite algae extract is prepared by mixing a sargassum henslowianum extract and spirulina platensis powder according to the mass ratio of 1: 3-6.
The sargassum henryi extract is prepared by adopting the following method: weighing 80-100 g of sargassum henslowianum dry powder according to a material-liquid ratio of 1: adding a methanol-chloroform organic phase solution into the solution of 5-8 g/mL, wherein the volume ratio of methanol to chloroform is 3: refluxing hot water at 1,100 ℃ for 2-3 times at constant temperature, each time for 50-60 min, carrying out vacuum filtration to obtain a filtrate, carrying out rotary evaporation and concentration on the filtrate to make the volume of a concentrated solution be 1/8-1/5 of the volume of the filtrate, and carrying out freeze drying at-40 to-30 ℃ for 8-10 h to obtain the gulfweed extract.
The inventor finds that the addition of the composite algae extract to the polypropylene plastic can play an effective anti-aging role, and the protection efficiency of the plastic is determined by polyphenols in the composite algae extract to a large extent. The activity of the complex algae extract hinders the decay of free radicals involved in oxidation in plastics. Especially, when plastics are influenced by photoaging, the composite algae extract can be promoted to be converted into a substructure with a shielding and protecting function from an initial structure by illumination, and meanwhile, the thermal stability of the composite algae extract is better than that of other natural oxidants and is not easy to degrade. However, the inventor finds that the biocompatibility of the composite algae extract and the polypropylene plastic matrix is insufficient in experiments, and therefore, the composite algae extract needs to be further processed.
More preferably, the composite algae extract is prepared by mixing a modified sargassum henslowianum extract and spirulina platensis powder according to a mass ratio of 1: 3-6.
Most preferably, the composite algae extract is prepared by mixing a modified sargassum henslowianum extract and spirulina platensis powder according to a mass ratio of 1: 4.
Further, the modified sargassum henslowianum extract is prepared by the following method: weighing 80-100 g of sargassum henslowianum dry powder according to a material-liquid ratio of 1: adding a methanol-chloroform organic phase solution into the solution of 5-8 g/mL, wherein the volume ratio of methanol to chloroform is 3: refluxing hot water at the constant temperature of 1,100 ℃ for 2-3 times, each time for 50-60 min, carrying out vacuum filtration to obtain a filtrate, carrying out rotary evaporation concentration on the filtrate to enable the volume of a concentrated solution to be 1/8-1/5 of the volume of the filtrate, carrying out freeze drying at the temperature of-40 to-30 ℃ for 8-10 h to obtain a sargassum henryi extract, adding 80-100 mL of water into 20-40 g of the sargassum henryi extract for uniform mixing, adjusting the pH value of a system to be 7.5-8.5 by using 0.1-0.3 mol/L of a sodium hydroxide aqueous solution, heating to 40-50 ℃, measuring 10-30 mL of a 15-20 wt% sodium hypochlorite aqueous solution, dropwise adding 3-5 g of sodium bisulfite after the reaction is finished, and carrying out reaction; and then, dropwise adding 52-68 wt% of bicyclo [2.2.2] oct-7-ene-2, 3,5, 6-tetracarboxylic dianhydride ethanol solution, reacting for 2-4 hours, adding 0.1-0.2 mol/L hydrochloric acid to adjust the pH value to 5.5-6.5, and washing, filtering and drying to obtain the modified sargassum henryi extract.
Carboxyl is introduced into the sargassum henryi extract through modification, ester carbonyl is introduced through successful esterification, steric hindrance in the sargassum henryi extract is changed, the surface of the sargassum henryi extract is rough, and the number of holes is obviously increased. Therefore, the compatibility of the sargassum henryi extract and the polypropylene matrix is facilitated, the adhesive effect of the sargassum henryi extract and the polypropylene matrix is enhanced, the protection of the composite algae extract on polypropylene plastics is enhanced, and the PP plastics have stronger anti-aging performance. Besides, the toughness of the PP plastic can be enhanced, and in addition, the composite algae extract also contains antibacterial active substances, so that the antibacterial property of the PP plastic can be enhanced.
The invention also provides a preparation method of the anti-aging PP plastic, which comprises the following steps:
s1, weighing polypropylene, plant fiber, an antibacterial agent, a heat stabilizer, a dispersing agent and a crosslinking agent according to a formula, adding the mixture into a mixer, mixing and stirring uniformly at a stirring speed of 400-600 r/min and a mixing temperature of 120-150 ℃ for 20-30 min, and mixing uniformly to obtain a mixed material;
s2, mixing the mixed material with the composite algae extract, adding the mixture into a double-screw extrusion granulator, and plasticizing and granulating at 150-160 ℃ to obtain the anti-aging PP plastic.
The composite algae extract is added in the preparation process of the polypropylene plastic, so that the heat resistance and radiation resistance of the plastic are improved, a high-concentration oxidation initiator is generated in the cracking process of the polypropylene under photo-thermal conditions, and the composite algae extract can effectively delay and slow down degradation. The sargassum henslowianum extract and the spirulina platensis powder can block the reaction of converting free radicals into peroxy structures. The sargassum henryi extract is modified to introduce carboxyl and is successfully esterified to introduce ester carbonyl, so that the steric hindrance in the sargassum henryi extract is changed, the surface of the sargassum henryi extract is rough, the number of holes is obviously increased, the compatibility of the sargassum henryi extract and a polypropylene matrix is facilitated, and the adhesive effect of the sargassum henryi extract and the polypropylene matrix is enhanced. Compared with the prior art, the composite algae extract added in the invention can endow the polypropylene plastic with the performances of ageing resistance, bacteriostasis, toughness enhancement and the like, is environment-friendly and further widens the application of the PP plastic.
Detailed Description
Introduction of raw materials in the examples:
polypropylene, PP RJ700, english plastic materials ltd, guan city;
jute fiber, 70mm in length, available from Dongguan from Shunfiwang textile Co., Ltd;
dunaliella salina powder, 100 mesh, Shanghai plain Biotech limited;
dried sargassum henslowianum powder of 120-140 meshes, Jinan Texing chemical Co., Ltd;
bicyclo [2.2.2] oct-7-ene-2, 3,5, 6-tetracarboxylic dianhydride, CAS: 1719-83-1, Shanghai Ji to Biochemical technology, Inc.
Example 1
The preparation method of the anti-aging PP plastic comprises the following steps:
s1 weighing 100kg of polypropylene, 12kg of jute fiber, 5kg of L-ascorbic acid stearate, 3kg of calcium 2-ethylhexanoate, 4kg of polyethylene glycol-1000, 6kg of diethylaminopropylamine and 4kg of composite algae extract, adding the materials into a mixer, mixing and stirring uniformly at the stirring speed of 500r/min at the mixing temperature of 140 ℃ for 30min, and mixing uniformly to obtain a mixed material;
s2, mixing the mixed material with the composite algae extract, adding the mixture into a double-screw extrusion granulator, and plasticizing and granulating at 155 ℃ to obtain the anti-aging PP plastic.
The composite algae extract is prepared by mixing a modified sargassum henslowianum extract and spirulina platensis powder according to the mass ratio of 1: 4.
The modified sargassum henryi extract is prepared by adopting the following method: weighing 100g of sargassum henslowianum dry powder according to a material-liquid ratio of 1: adding a methanol-chloroform organic phase solution into the solution at the concentration of 8g/mL, wherein the volume ratio of methanol to chloroform is 3: refluxing hot water at 1,100 ℃ for 3 times at constant temperature, each time for 60min, vacuum filtering to obtain filtrate, concentrating the filtrate by rotary evaporation to make the volume of the concentrated solution be 1/8 of the volume of the filtrate, freeze-drying at-40 ℃ for 10h to obtain an Sargassum henneri extract, adding 90mL of water into 30g of the Sargassum henneri extract, mixing uniformly, adjusting the pH value of the system to 8.5 by using 0.2mol/L sodium hydroxide aqueous solution, heating to 50 ℃, adding 20mL of 15 wt% sodium hypochlorite aqueous solution within 30min, and adding 4g of sodium bisulfite after the reaction is finished; then dripping 61 wt% of bicyclo [2.2.2] oct-7-ene-2, 3,5, 6-tetracarboxylic dianhydride ethanol solution, reacting for 4h, adding 0.1mol/L hydrochloric acid to adjust the pH value to 6.5, and washing, filtering and drying to obtain the modified sargassum henryi extract.
Example 2
The preparation method of the anti-aging PP plastic comprises the following steps:
s1 weighing 100kg of polypropylene, 12kg of jute fiber, 5kg of L-ascorbic acid stearate, 3kg of calcium 2-ethylhexanoate, 4kg of polyethylene glycol-1000, 6kg of diethylaminopropylamine and 4kg of composite algae extract, adding the materials into a mixer, mixing and stirring uniformly at the stirring speed of 500r/min at the mixing temperature of 140 ℃ for 30min, and mixing uniformly to obtain a mixed material;
s2, mixing the mixed material with the composite algae extract, adding the mixture into a double-screw extrusion granulator, and plasticizing and granulating at 155 ℃ to obtain the anti-aging PP plastic.
The composite algae extract is prepared by mixing a sargassum henslowianum extract and spirulina salt powder according to the mass ratio of 1: 4.
The sargassum henslowianum extract is prepared by the following method: weighing 100g of sargassum henslowianum dry product powder, and mixing the powder according to a material-liquid ratio of 1: adding a methanol-chloroform organic phase solution into the solution of 8g/mL, wherein the volume ratio of methanol to chloroform is 3: refluxing with hot water at 1,100 deg.C for 60min for 3 times, vacuum filtering to obtain filtrate, concentrating by rotary evaporation to obtain concentrated solution with volume of 1/8, and freeze drying at-40 deg.C for 10 hr to obtain Sargassum henryi extract.
Example 3
The preparation method of the anti-aging PP plastic comprises the following steps:
s1 weighing 100kg of polypropylene, 12kg of jute fiber, 5kg of L-ascorbic acid stearate, 3kg of 2-calcium ethylhexanoate, 10004 kg of polyethylene glycol, 6kg of diethylaminopropylamine and 4kg of sargassum henslowianum extract, adding the materials into a mixer, mixing and stirring uniformly at the stirring speed of 500r/min at the mixing temperature of 140 ℃ for 30min, and mixing uniformly to obtain a mixed material;
s2, mixing the mixed material with the sargassum henslowianum extract, adding the mixture into a double-screw extrusion granulator, and plasticizing and granulating at 155 ℃ to obtain the anti-aging PP plastic.
The sargassum henryi extract is prepared by adopting the following method: weighing 100g of sargassum henslowianum dry powder according to a material-liquid ratio of 1: adding a methanol-chloroform organic phase solution into the solution of 8g/mL, wherein the volume ratio of methanol to chloroform is 3: refluxing with hot water at 1,100 deg.C for 3 times, each for 60min, vacuum filtering to obtain filtrate, concentrating the filtrate by rotary evaporation to obtain concentrated solution with volume of 1/8, and freeze drying at-40 deg.C for 10 hr to obtain Sargassum henryi extract.
Example 4
The preparation method of the anti-aging PP plastic comprises the following steps:
s1, weighing 100kg of polypropylene, 12kg of jute fiber, 5kg of L-ascorbic acid stearate, 3kg of 2-calcium ethylhexanoate, 10004 kg of polyethylene glycol, 6kg of diethylaminopropylamine and 4kg of saline spirulina powder, adding the materials into a mixer, mixing and stirring uniformly at the stirring speed of 500r/min at the mixing temperature of 140 ℃ for 30min, and mixing uniformly to obtain a mixed material;
s2, mixing the mixed material with the salt spirulina powder, adding the mixture into a double-screw extrusion granulator, and plasticizing and granulating at 155 ℃ to obtain the anti-aging PP plastic.
Example 5
The preparation method of the anti-aging PP plastic comprises the following steps:
s1 weighing 100kg of polypropylene, 12kg of jute fiber, 5kg of L-ascorbic acid stearate, 3kg of 2-calcium ethylhexanoate, 10004 kg of polyethylene glycol, 6kg of diethylaminopropylamine and 4kg of modified sargassum henryi extract, adding the materials into a mixer, mixing and stirring uniformly at the stirring speed of 500r/min at the mixing temperature of 140 ℃ for 30min, and mixing uniformly to obtain a mixed material;
s2, mixing the mixed material with the modified sargassum henryi extract, adding the mixture into a double-screw extrusion granulator, and plasticizing and granulating at 155 ℃ to obtain the anti-aging PP plastic.
The modified sargassum henryi extract is prepared by adopting the following method: weighing 100g of sargassum henslowianum dry powder according to a material-liquid ratio of 1: adding a methanol-chloroform organic phase solution into the solution of 8g/mL, wherein the volume ratio of methanol to chloroform is 3: refluxing hot water at 1,100 ℃ for 3 times at constant temperature, each time for 60min, vacuum filtering to obtain filtrate, concentrating the filtrate by rotary evaporation to make the volume of the concentrated solution be 1/8 of the volume of the filtrate, freeze-drying at-40 ℃ for 10h to obtain an Sargassum henneri extract, adding 90mL of water into 30g of the Sargassum henneri extract, mixing uniformly, adjusting the pH value of the system to 8.5 by using 0.2mol/L sodium hydroxide aqueous solution, heating to 50 ℃, adding 20mL of 15 wt% sodium hypochlorite aqueous solution within 30min, and adding 4g of sodium bisulfite after the reaction is finished; then dripping 61 wt% of bicyclo [2.2.2] oct-7-ene-2, 3,5, 6-tetracarboxylic dianhydride ethanol solution, reacting for 4h, adding 0.1mol/L hydrochloric acid to adjust the pH value to 6.5, and washing, filtering and drying to obtain the modified sargassum henryi extract.
Comparative example 1
The preparation method of the anti-aging PP plastic comprises the following steps:
s1, weighing 100kg of polypropylene, 12kg of jute fiber, 5kg of L-ascorbic acid stearate, 3kg of calcium 2-ethylhexanoate, 10004 kg of polyethylene glycol and 6kg of diethylaminopropylamine, adding the materials into a mixer, mixing and stirring uniformly at the stirring speed of 500r/min at the mixing temperature of 140 ℃ for 30min, and mixing uniformly to obtain a mixed material;
s2, adding the mixed material into a double-screw extrusion granulator, plasticizing and granulating at 155 ℃ to obtain the anti-aging PP plastic.
Test example 1
The anti-aging PP plastics prepared in examples 1-5 and comparative example 1 are subjected to anti-aging performance test with the test standard of GB/T1040.1-2018, the tensile strength 1 of the PP plastics is detected, then the PP plastics are placed under a 500W ultraviolet lamp for irradiation for 7 days, and the tensile strength 2 is detected according to the same method, and the specific results are shown in Table 1.
TABLE 1 test result table of anti-aging property of PP plastics
As can be seen from table 1, the anti-aging performance of example 1 is the best, the addition of the composite algae extract to the polypropylene plastic provides an effective anti-aging effect, and the efficiency of protection of the plastic is largely determined by the polyphenols in the composite algae extract. The activity of the complex algae extract hinders the decay of free radicals involved in oxidation in plastics. Especially when plastics are influenced by light aging, the composite algae extract can be promoted to be converted into a substructure with a shielding protection function from an initial structure by illumination, a high-concentration oxidation initiator is generated in the cracking process of polypropylene under illumination, the composite algae extract can effectively delay and slow down degradation, and the sargassum henslowianum extract and the spirulina dunaliensis powder can block the reaction of converting free radicals into peroxy structures. Meanwhile, the stability of the composite algae extract is better than that of other natural oxidants, and the composite algae extract is not easy to degrade.
Test example 2
Impact strength tests are carried out on the anti-aging PP plastics prepared in examples 1-5 and comparative example 1, the test standard is GB/T1843-2008, and specific test results are shown in Table 2.
TABLE 2 impact Strength test results Table
| Impact strength KJ/M 2 | |
| Example 1 | 18.4 |
| Example 2 | 16.2 |
| Example 3 | 15.4 |
| Example 4 | 12.7 |
| Example 5 | 15.8 |
| Comparative example 1 | 11.1 |
It is seen from table 2 that the toughness of the polypropylene plastic is enhanced by adding the composite alga extract, and in example 1, carboxyl is introduced into the sargassum henslowianum extract through modification and ester carbonyl is introduced through esterification, so that steric hindrance inside the sargassum henslowianum extract is changed, the surface of the sargassum henslowianum extract becomes rough, and the number of holes is increased obviously, and therefore the compatibility of the sargassum henslowianum extract and the polypropylene matrix is facilitated, the adhesive effect of the sargassum henslowianum extract and the polypropylene matrix is enhanced, and the impact resistance of the PP plastic is improved.
Claims (10)
1. The anti-aging PP plastic is characterized by comprising the following raw materials in parts by weight: 80-100 parts of polypropylene, 9-13 parts of plant fiber, 4-8 parts of an antibacterial agent, 1-4 parts of a heat stabilizer, 1-5 parts of a dispersing agent, 5-7 parts of a cross-linking agent and 2-6 parts of a composite algae extract.
2. The anti-aging PP plastic of claim 1, wherein: the composite algae extract is prepared by mixing a modified sargassum henslowianum extract and spirulina platensis powder according to a mass ratio of 1: 3-6.
3. The anti-aging PP plastic of claim 2, wherein the modified Sargassum henryi extract is prepared by the following method: weighing 80-100 g of sargassum henslowianum dry powder according to a material-liquid ratio of 1: adding a methanol-chloroform organic phase mixed solution into the solution of 5-8 g/mL, and refluxing the solution for 2-3 times at constant temperature with hot water of 100 ℃ for 50-60 min each time; performing vacuum filtration to obtain filtrate, performing rotary evaporation on the filtrate, performing freeze drying to obtain a sargassum henryi extract, adding 80-100 mL of water into 20-40 g of the sargassum henryi extract, uniformly mixing, adjusting the pH value of a system to be 7.5-8.5 by using 0.1-0.3 mol/L sodium hydroxide aqueous solution, heating to 40-50 ℃, measuring 10-30 mL of 15-20 wt% sodium hypochlorite aqueous solution, dropwise adding within 20-30 min, and adding 3-5 g of sodium bisulfite after the reaction is finished; and then, dropwise adding 52-68 wt% of bicyclo [2.2.2] oct-7-ene-2, 3,5, 6-tetracarboxylic dianhydride ethanol solution, reacting for 2-4 hours, adding 0.1-0.2 mol/L hydrochloric acid to adjust the pH value to 5.5-6.5, and washing, filtering and drying to obtain the modified sargassum henryi extract.
4. The anti-aging PP plastic as claimed in claim 1, wherein: the plant fiber is one of jute fiber and corn straw fiber.
5. The anti-aging PP plastic of claim 1, wherein: the antibacterial agent is one of N- (trichloromethylthio) phthalimide, ascorbyl stearate and butyl hydroxy anisol.
6. The anti-aging PP plastic of claim 1, wherein: the heat stabilizer is one of propylene oxide and calcium isooctanoate.
7. The anti-aging PP plastic of claim 1, wherein: the dispersing agent is one or more of stearic acid, polyethylene wax, liquid paraffin and polyethylene glycol.
8. The anti-aging PP plastic of claim 1, wherein: the cross-linking agent is diethylaminopropylamine.
9. The preparation method of the anti-aging PP plastic as claimed in any one of claims 1 to 8, characterized by comprising the following steps:
s1, weighing the polypropylene, the plant fiber, the antibacterial agent, the heat stabilizer, the dispersing agent and the crosslinking agent according to the formula, adding the mixture into a mixer, mixing and stirring uniformly at the stirring speed of 400-600 r/min, and mixing uniformly to obtain a mixed material;
s2, mixing the mixed material with the composite algae extract, adding the mixture into a double-screw extrusion granulator, and plasticizing and granulating at 150-160 ℃ to obtain the anti-aging PP plastic.
10. The method for preparing the anti-aging PP plastic as claimed in claim 9, wherein: the mixing and stirring temperature in the step S1 is 120-150 ℃, and the mixing and stirring time is 20-30 min.
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| CN202210755850.7A CN114989530A (en) | 2022-06-29 | 2022-06-29 | Anti-aging PP plastic and preparation method thereof |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102961395A (en) * | 2012-11-26 | 2013-03-13 | 浙江中烟工业有限责任公司 | Sargassum henslowianum polysaccharide or sargassum henslowianum polysaccharide containing extract and applications thereof |
| CN107987401A (en) * | 2017-12-19 | 2018-05-04 | 会通新材料股份有限公司 | A kind of heat oxygen aging resistance vegetable fiber reinforced polypropylene composite material and preparation method thereof |
| CN113527813A (en) * | 2021-08-05 | 2021-10-22 | 界首市锦丰塑业有限公司 | Preparation process of polypropylene modified plastic |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102961395A (en) * | 2012-11-26 | 2013-03-13 | 浙江中烟工业有限责任公司 | Sargassum henslowianum polysaccharide or sargassum henslowianum polysaccharide containing extract and applications thereof |
| CN107987401A (en) * | 2017-12-19 | 2018-05-04 | 会通新材料股份有限公司 | A kind of heat oxygen aging resistance vegetable fiber reinforced polypropylene composite material and preparation method thereof |
| CN113527813A (en) * | 2021-08-05 | 2021-10-22 | 界首市锦丰塑业有限公司 | Preparation process of polypropylene modified plastic |
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