CN114891260B - Light plastic bucket and preparation method thereof - Google Patents
Light plastic bucket and preparation method thereof Download PDFInfo
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- CN114891260B CN114891260B CN202210428005.9A CN202210428005A CN114891260B CN 114891260 B CN114891260 B CN 114891260B CN 202210428005 A CN202210428005 A CN 202210428005A CN 114891260 B CN114891260 B CN 114891260B
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
- C08J9/04—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent
- C08J9/06—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent by a chemical blowing agent
- C08J9/08—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent by a chemical blowing agent developing carbon dioxide
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/16—Making multilayered or multicoloured articles
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
- B65D11/00—Containers having bodies formed by interconnecting or uniting two or more rigid, or substantially rigid, components made wholly or mainly of plastics material
- B65D11/02—Containers having bodies formed by interconnecting or uniting two or more rigid, or substantially rigid, components made wholly or mainly of plastics material of curved cross-section
- B65D11/06—Drums or barrels
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
- B65D11/00—Containers having bodies formed by interconnecting or uniting two or more rigid, or substantially rigid, components made wholly or mainly of plastics material
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- C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
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- C08J9/0023—Use of organic additives containing oxygen
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- C08J2323/00—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers
- C08J2323/02—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers not modified by chemical after treatment
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- C08J2405/00—Characterised by the use of polysaccharides or of their derivatives not provided for in groups C08J2401/00 or C08J2403/00
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Abstract
The application relates to the technical field of plastics, in particular to a lightweight plastic bucket and a preparation method thereof. A lightweight plastic bucket comprises a foaming material layer and plastic layers positioned on two sides of the foaming material layer; the foaming material layer comprises the following raw materials in parts by weight: 65-85 parts of mixed resin; 0.05-1 part of stabilizer; 1-4 parts of foaming agent; 0.3-4 parts of nucleating agent; the mixed resin is formed by mixing polypropylene resin, high-density polyethylene resin, ethylene propylene diene monomer and trimethylolpropane trimethacrylate. The light plastic bucket of this application comprises foaming material layer and double-deck plastic layer, has the characteristics of tensile strength height and light in weight, is favorable to improving the convenience of the transportation of high dangerous goods to reduce the cost of transportation of high dangerous goods.
Description
Technical Field
The application relates to the technical field of plastics, in particular to a lightweight plastic bucket and a preparation method thereof.
Background
The highly dangerous articles comprise chemical agents such as strong acid and alkali, inflammable and explosive agents, strong reduction agents and strong oxidation agents, and the highly dangerous articles easily cause serious injury to the personal and property of surrounding personnel and even serious damage to the environment. Therefore, the country has very strict regulations for the packaging, transportation and storage of such dangerous goods.
At present, high-strength sealed plastic barrels are mostly used for containing and transporting high-risk articles. In order to ensure the safety of the plastic barrels for containing and transporting high dangerous goods, the strength of the plastic barrels is required to be high. The plastic barrels in the related art are mostly made of pure plastic materials.
Aiming at the related art, the inventor finds that the plastic bucket prepared by pure plastic has larger density, so that the empty bucket of the plastic bucket has higher weight, thereby bringing inconvenience to the transportation of highly dangerous goods and increasing the transportation cost of the highly dangerous goods to a certain extent. Therefore, a plastic bucket with high strength and light weight is researched, and has very important significance.
Disclosure of Invention
In order to improve the convenience of transportation of high dangerous goods and reduce the transportation cost of the high dangerous goods, the application provides a light plastic bucket and a preparation method thereof.
In a first aspect, the present application provides a lightweight plastic bucket, which adopts the following technical scheme:
a lightweight plastic bucket comprises a foaming material layer and plastic layers positioned on two sides of the foaming material layer;
the foaming material layer comprises the following raw materials in parts by weight:
65-85 parts of mixed resin;
0.05-1 part of stabilizer;
1-4 parts of foaming agent;
0.3-4 parts of nucleating agent;
the mixed resin is formed by mixing polypropylene resin, high-density polyethylene resin, ethylene propylene diene monomer and trimethylolpropane trimethacrylate.
Through adopting above-mentioned technical scheme, this application has changed traditional pure plastic drum into the light plastic drum that comprises foaming material layer and double-deck plastic layer, owing to adopts polypropylene resin, high density polyethylene resin, the mixed resin that ethylene propylene diene monomer and trimethylolpropane trimethacrylate mix to constitute, the foaming material layer of foaming the gained has the characteristics of tensile strength height and light in weight. Therefore, the light plastic bucket can reduce the weight of the plastic bucket on the premise of ensuring the strength of the plastic bucket, is favorable for improving the convenience of transportation of high dangerous goods and reduces the transportation cost of the high dangerous goods.
In the foaming material layer, polypropylene resin, high-density polyethylene resin, ethylene propylene diene monomer and trimethylolpropane trimethacrylate are subjected to blending crosslinking. The high-density polyethylene resin can damage the regularity of the molecular chain arrangement of the polypropylene resin, and can reduce the crystallinity and the melting temperature of the polypropylene resin to a certain extent. At this time, because the ethylene propylene diene monomer rubber has higher viscosity and stronger interaction force among particles, physical entanglement points can be formed with the polypropylene resin with reduced crystallinity, thereby improving the melt strength and the tensile strength of the polypropylene resin. Therefore, under the condition that the crosslinking auxiliary agent trimethylolpropane trimethacrylate exists, the melt strength and the tensile strength of the obtained mixed resin can be improved by adopting the high-density polyethylene resin and the ethylene propylene diene monomer to be compounded together.
The melt strength and tensile strength of the resulting hybrid resin are high. Therefore, in the foaming process of the foaming material mixture composed of other raw materials such as the mixed resin, the foaming agent and the like, the foaming gas is difficult to escape, the rupture of the cell walls is inhibited, and the foaming efficiency is promoted. Meanwhile, in the process of growing the foam cells, the wall of the foam cells can be subjected to stronger tensile stress and is not easy to break and combine, the process of uniformly nucleating and growing the foam cells can be more stably completed, the obtained foam cells are uniformly distributed, the pore diameter is compact, and the broken pores are fewer, so that the tensile strength of the foaming material layer is improved, and the weight of the foaming material layer is reduced.
Therefore, the plastic barrel formed by the foaming material layer and the double-layer plastic layer has the advantages of high tensile strength and light weight compared with the plastic barrel formed by the pure plastic layer, and is beneficial to reducing the transportation cost of high dangerous goods.
Preferably, the mixed resin is formed by mixing (0.2-0.4): (0.1-0.2): (0.04-0.06) by weight ratio of polypropylene resin, high-density polyethylene resin, ethylene propylene diene monomer and trimethylolpropane trimethacrylate.
By adopting the technical scheme, the polypropylene resin, the high-density polyethylene resin, the ethylene propylene diene monomer and the trimethylolpropane trimethacrylate are mixed according to the proportion, so that the melt strength and the tensile strength of the obtained mixed resin can be further improved. Due to the improvement of the melt strength of the mixed resin, the foam cells of the obtained foam material layer are distributed more uniformly, and the pore diameter is more compact. The quality of the resulting foamed material layer and the resulting lightweight plastic bucket can be somewhat reduced. Meanwhile, the tensile strength of the mixed resin is improved, and the tensile strength of the obtained light plastic bucket is also improved to a certain extent.
Preferably, the mixed resin is formed by mixing polypropylene resin, high-density polyethylene resin, ethylene propylene diene monomer and trimethylolpropane trimethacrylate according to the weight ratio of 1:0.3:0.15:0.05.
By adopting the technical scheme, the polypropylene resin, the high-density polyethylene resin, the ethylene propylene diene monomer and the trimethylolpropane trimethacrylate are compounded according to the proportion, and the prepared light plastic bucket has the tensile strength of up to 33.8MPa and the density of down to 0.65g/cm 3 。
Preferably, the melt flow rate of the polypropylene resin is 2.5g/10min-3.5g/10min, and the detection condition is 230 ℃/2.16kg; the melt flow rate of the high-density polyethylene resin is 0.5g/10min-0.8g/10min, and the detection condition is 190 ℃/2.16kg.
By adopting the technical scheme, the light plastic bucket prepared from the polypropylene resin with the melt flow rate in the specific range and the high-density polyethylene resin has the tensile strength as high as 34.5-34.7MPa and the density as low as 0.63-0.64g/cm 3 。
Preferably, the high-density polyethylene resin is further subjected to a modification treatment, wherein the modification treatment comprises the following steps: and mixing the high-density polyethylene resin, vinyl triethoxysilane and di-tert-butyl peroxide, and extruding and granulating to obtain the modified high-density polyethylene resin.
By adopting the technical scheme, the di-tert-butyl peroxide is adopted as the initiator, so that the initiation efficiency is high, unsaturated vinyl triethoxysilane can be grafted on the high-density polyethylene resin, the molecular weight of the obtained modified high-density polyethylene resin and the acting force between polyethylene molecular chains are improved, and the melt flow index of the modified high-density polyethylene resin is reduced. Therefore, the melt strength of the modified high-density polyethylene resin is improved, the foaming of the foaming material mixture is promoted, and the weight of the obtained lightweight plastic barrel is further reduced. Meanwhile, after the high-density polyethylene resin is modified, the compatibility with the polypropylene resin is further enhanced. Therefore, when the obtained light plastic is stressed, the modified high-density polyethylene resin can be used as a stress concentration point in the light plastic to absorb a large amount of energy, so that the tensile strength of the obtained light plastic bucket is improved.
Preferably, the high-density polyethylene resin, the vinyl triethoxysilane and the di-tert-butyl peroxide are mixed according to the weight ratio of 1 (0.14-0.16) (0.012-0.016).
By adopting the technical scheme, the high-density polyethylene resin, the vinyl triethoxysilane and the di-tert-butyl peroxide are compounded according to the proportion, so that the vinyl triethoxysilane has a certain grafting rate on the high-density polyethylene resin, the modified high-density polyethylene resin has a certain melt strength, and the modified high-density polyethylene resin has good crystallinity. Therefore, the foamed material layer foamed after blending the modified high-density polyethylene resin with polypropylene resin and other raw materials with high melt strength is used for preparing the light plastic bucket, the tensile strength is as high as 35.8-36.0MPa, and the density is as low as 0.60-0.61g/cm 3 。
Preferably, in the plastic barrel, the thickness of the plastic layer is more than 0.3mm, and the total thickness of the plastic barrel is 2.8-3.2mm.
Preferably, the tensile strength of the lightweight plastic barrel is 32.2-36.0MPa, and the density is 0.6-0.7g/cm 3 。
Through adopting above-mentioned technical scheme, adopt above-mentioned light plastic drum to store high dangerous goods, be favorable to reducing the cost of transportation of high dangerous goods.
In a second aspect, the present application provides a method for manufacturing a lightweight plastic bucket, which adopts the following technical scheme:
the preparation method of the light plastic bucket comprises the following preparation steps:
s1: mixing polypropylene resin, high-density polyethylene resin, ethylene propylene diene monomer and trimethylolpropane trimethacrylate, melting, extruding and granulating to obtain mixed resin, and then mixing with a stabilizer, a foaming agent and a nucleating agent to obtain a mixed raw material of a foaming material layer;
s2: mixing the plastic layer raw materials to obtain a plastic layer mixed raw material;
s3: adding the mixed raw materials of the foaming material layer in the step S1 and the mixed raw materials of the plastic layer in the step S2 into three dies arranged side by side, and performing injection molding to obtain the light plastic bucket with the three-layer structure of the plastic layer, the foaming material layer and the plastic layer.
By adopting the technical scheme, the preparation method of the light plastic bucket is simple to operate and convenient for large-scale production.
In summary, the present application has the following beneficial effects:
1. the lightweight plastic barrel formed by the foaming layer and the double-layer plastic layer has the characteristic of light weight on the premise of considering tensile strength, is beneficial to improving the convenience of transportation of highly dangerous goods and reduces the transportation cost of the highly dangerous goods;
2. the mixed resin formed by mixing polypropylene resin, high-density polyethylene resin, ethylene propylene diene monomer and trimethylolpropane trimethacrylate has higher melt strength and tensile strength, and the foamed material layer obtained after foaming has lower density and higher compressive strength;
3. the method is simple to operate and convenient for large-scale production.
Detailed Description
The present application is described in further detail below with reference to examples.
The materials used in the examples herein are commercially available except as specifically described below.
Ethylene propylene diene monomer with the brand of 3745 is purchased from Dongguan city and plastic chemical industry limited company;
beta-cyclodextrin, product number 046, purchased from wuhan hong Yi biotechnology limited;
vinyl triethoxysilane, brand KH151, purchased from Shandong Ring chemical Co., ltd;
the tensile strength and density of the lightweight plastic bucket obtained in the embodiment of the present application and the plastic bucket obtained in the comparative example were measured as follows:
tensile strength detection: reference is made to GB-T1040.1-2006 "determination of tensile Properties of plastics";
and (3) density detection: reference is made to the liquid specific gravity bottle method in GB-T1033.1-2008 "determination of Plastic non-foam Density".
Examples
Examples 1 to 3
A lightweight plastic bucket comprises a foaming material layer and plastic layers positioned on two outer sides of the foaming material layer; the respective raw materials in the foaming material layer and the plastic layer and the weights thereof are shown in the following table.
The mixed resin is obtained by mixing polypropylene resin, high-density polyethylene resin, ethylene propylene diene monomer and trimethylolpropane trimethacrylate according to the weight ratio of 1:0.1:0.3:0.04, and then melting, extruding and granulating.
The melt flow rate of the polypropylene resin is 2.0g/10min, and the detection condition is 230 ℃/2.16kg;
the melt flow rate of the high density polyethylene resin was 0.3g/10min, and the test conditions were 190℃C/2.16 kg.
The preparation method of the lightweight plastic bucket in the embodiment is as follows:
s1: stirring and mixing polypropylene resin, high-density polyethylene resin, ethylene propylene diene monomer and trimethylolpropane trimethacrylate for 20min at 120 ℃ under 200r/min, carrying out melt extrusion granulation to obtain mixed resin, and stirring and mixing the mixed resin with a stabilizer, a foaming agent and a nucleating agent for 20min at 120 ℃ under 250r/min to obtain a foaming material layer mixed raw material;
s2: mixing polypropylene resin, glass fiber, paraffin oil, silica micropowder and antioxidant 1010 at 120deg.C under 200r/min for 20min to obtain plastic layer mixed raw material;
s3: adding the mixed raw materials of the foaming material layer in the step S1 and the mixed raw materials of the plastic layer in the step S2 into three dies arranged side by side, and performing injection molding to obtain the light plastic bucket with the three-layer structure of the plastic layer, the foaming material layer and the plastic layer.
The thickness of the plastic barrel is 3mm through detection, wherein the thickness of the plastic layer is 0.4mm, and the thickness of the foaming material layer is 2.2mm.
The lightweight plastic barrels obtained in examples 1-3 were tested for tensile strength and density, and the test results are shown in the following table.
As can be seen from the analysis of the data in the table, the lightweight plastic barrels obtained in examples 1-3 of the present application have tensile strengths as high as 32.2-32.5MPa and densities as low as 0.68-0.70g/cm 3 Has higher tensile strength and lower density, and is beneficial to reducing the transportation cost of highly dangerous goods.
Examples 4 to 7
A lightweight plastic barrel is different from example 2 in that the weight ratio of polypropylene resin, high-density polyethylene resin, ethylene propylene diene monomer and trimethylolpropane trimethacrylate in the mixed resin is different.
The weights of the polypropylene resin, the high-density polyethylene resin, the ethylene propylene diene monomer and the trimethylolpropane trimethacrylate are shown in the following table.
The lightweight plastic barrels obtained in examples 4 to 7 were subjected to tensile strength and density tests, and the test results are shown in the following table.
As can be seen from the analysis of the data in the table, the lightweight plastic barrels obtained in examples 4-6 of the present application have tensile strengths as high as 33.6-33.8MPaThe density is as low as 0.65-0.66g/cm 3 . The lightweight plastic barrel obtained in example 7 of the application has a tensile strength of up to 32.6MPa and a density of as low as 0.68g/cm 3 。
As can be seen from a comparison of examples 4-6 with examples 2 and 7, the lightweight plastic buckets obtained in examples 4-6 have significantly higher tensile strength than the lightweight plastic buckets obtained in examples 2 and 7, and the lightweight plastic buckets obtained in examples 4-6 have significantly lower density than the lightweight plastic buckets obtained in examples 2 and 7. Therefore, in the total raw materials for preparing the light plastic bucket, the mixed resin is formed by mixing (0.2-0.4): (0.1-0.2): (0.04-0.06) by weight ratio of polypropylene resin, high-density polyethylene resin, ethylene propylene diene monomer and trimethylolpropane trimethacrylate, so that the tensile strength of the obtained light plastic bucket can be improved, and the density of the light plastic bucket can be reduced.
In examples 4-6, the lightweight plastic bucket obtained in example 5 was higher in tensile strength and lower in density.
Examples 8 to 10
A lightweight plastic barrel is different from example 5 in that in the mixed resin, the melt flow rates of the polypropylene resin and the high-density polyethylene resin are different.
The melt flow rate of the polypropylene resin is detected at 230 ℃/2.16kg; the melt flow rate of the high-density polyethylene resin was measured at 190℃C/2.16 kg.
The lightweight plastic barrels of examples 8-10 were tested for tensile strength and density, and the test results are shown in the following table.
As can be seen from the analysis of the data in the table, the lightweight plastic barrels of examples 8-10 of the application have tensile strengths as high as 34.5-34.7MPa and densities as low as 0.63-0.64g/cm 3 . According to the embodiment8-10 by comparison with example 5, the lightweight plastic bucket obtained in example 8 has significantly higher tensile strength than the lightweight plastic bucket obtained in example 5, and also has a relatively lower density. Therefore, in the total raw materials for preparing the lightweight plastic bucket, the melt flow rate of the polypropylene resin is 2.5g/10min-3.5g/10min, and the melt flow rate of the high-density polyethylene resin is 0.5g/10min-0.8g/10min, so that the tensile strength of the lightweight plastic bucket can be improved to a certain extent, and the density of the lightweight plastic bucket can be reduced.
Example 11
A lightweight plastic bucket, different from example 9 in that in the mixed resin, the high-density polyethylene resin is further subjected to a modification treatment, the modification treatment steps are: 8.76kg of high-density polyethylene resin, 1.14kg of vinyl triethoxysilane and 0.11kg of di-tert-butyl peroxide are mixed, extruded and granulated at 180 ℃ under the condition of 230-240r/min, and the modified high-density polyethylene resin is obtained.
Wherein, the high-density polyethylene resin, the vinyl triethoxysilane and the di-tert-butyl peroxide are mixed according to the weight ratio of 1:0.13:0.012.
The lightweight plastic bucket obtained in example 9 was subjected to tensile strength and density tests, and the test results are shown in the following table.
As can be seen from the analysis of the data in the table, the lightweight plastic barrel obtained in example 11 of the present application has a tensile strength as high as 35.4MPa and a density as low as 0.62g/cm 3 . As can be seen from a comparison of example 9 with example 8, the lightweight plastic bucket obtained in example 9 has significantly higher tensile strength than the lightweight plastic bucket obtained in example 8, and also has a relatively lower density. Therefore, in the total raw materials for preparing the light plastic bucket, the high-density polyethylene resin is modified, so that the tensile strength of the obtained light plastic bucket is improved, and the density of the light plastic bucket is reduced.
Examples 12 to 14
A lightweight plastic barrel is different from example 11 in that in the modification treatment step of the high-density polyethylene resin, the weight ratio of the high-density polyethylene resin, vinyltriethoxysilane and di-t-butyl peroxide is different.
The weights of the high density polyethylene resin, vinyltriethoxysilane and di-t-butyl peroxide are shown in the table below.
The lightweight plastic barrels obtained in examples 12 to 14 were tested for tensile strength and density, and the test results are shown in the following table.
As can be seen from the analysis of the data in the table, the lightweight plastic barrels obtained in examples 12-14 of the present application have tensile strengths as high as 35.8-36.0MPa and densities as low as 0.60-0.61g/cm 3 . As can be seen from a comparison of examples 12-14 with example 11, the lightweight plastic buckets of examples 12-14 have significantly higher tensile strength and relatively lower density than the lightweight plastic bucket of example 11. Thus, it is shown that in the modification step of the high-density polyethylene resin, the vinyl triethoxysilane and the di-tert-butyl peroxide are mixed according to the weight ratio of 1 (0.14-0.16) to 0.012-0.016, so that the tensile strength of the obtained lightweight plastic barrel can be improved, and the density of the lightweight plastic barrel can be reduced.
Comparative example
Comparative example 1
A plastic bucket comprises the following raw materials in parts by weight:
| polypropylene resin/kg | 100 |
| Glass fibre/kg | 5 |
| Paraffin oil/kg | 3 |
| Silica micropowder/kg | 3 |
| Antioxidant 1010/kg | 0.1 |
The melt flow rate of the polypropylene resin was 2.0g/10min, and the test conditions were 230℃C/2.16 kg.
The preparation method of the plastic bucket comprises the following steps:
mixing polypropylene resin, glass fiber, paraffin oil, silica micropowder and antioxidant 1010, extruding, granulating, and injection molding to obtain plastic barrel.
The thickness of the plastic barrel is 3mm through detection.
Comparative example 2
A plastic bucket was different from example 13 in that the modified high density polyethylene resin was replaced with an equal amount of low density polyethylene having a melt flow rate of 1.8g/10min under conditions of 190 ℃/2.16kg.
Comparative example 3
A plastic bucket is different from example 13 in that an equal amount of polyolefin elastomer is used to replace ethylene propylene diene monomer rubber, wherein the polyolefin elastomer is available under the brand name 8003 from Jiaxin source plastics Inc. of Suzhou.
The plastic barrels obtained in comparative examples 1 to 3 were subjected to tensile strength and density tests, and the test results are shown in the following table.
As can be seen from the analysis of the above table data, the plastic bucket obtained in comparative example 1 had a tensile strength of 32MPa and a density of 0.95g/cm 3 The method comprises the steps of carrying out a first treatment on the surface of the The plastic barrels obtained in comparative examples 2 to 3 had tensile strengths of 30 to 30.1MPa and densities of 0.73 to 0.84g/cm 3 。
As can be seen from a comparison of example 13 with comparative example 1, the lightweight plastic bucket obtained in example 13 has a high tensile strength which is relatively improved by 12.5% and a relatively reduced density by 36.84%. Therefore, the plastic barrel has the characteristics of high tensile strength and light weight, and is favorable for reducing the transportation cost of high dangerous goods.
As can be seen from a comparison of example 13 with comparative examples 2-3, the lightweight plastic bucket obtained in example 13 has a relatively high tensile strength of 19.6-20% and a relatively low density of 17.81-28.57%. Therefore, the polypropylene resin, the high-density polyethylene resin, the ethylene propylene diene monomer and the trimethylolpropane trimethacrylate are compounded to obtain the mixed resin in the total raw materials of the light plastic bucket, and the light plastic bucket is finally prepared, so that the tensile strength is higher, and the density is lower. The reason for this analysis may be that the high-density polyethylene resin in the mixed resin and the ethylene propylene diene monomer rubber as the elastomer have a synergistic effect, and the melt strength and tensile strength of the obtained mixed resin are improved. The lightweight plastic bucket thus obtained has the advantage of high tensile strength and light weight. Therefore, after the elastomer is replaced with the polyolefin elastomer, the resulting plastic bucket has a lower tensile strength and a higher density than the lightweight plastic bucket of example 13.
The present embodiment is merely illustrative of the present application and is not intended to be limiting, and those skilled in the art, after having read the present specification, may make modifications to the present embodiment without creative contribution as required, but is protected by patent laws within the scope of the claims of the present application.
Claims (8)
1. The light plastic bucket is characterized by comprising a foaming material layer and plastic layers positioned on two sides of the foaming material layer;
the foaming material layer comprises the following raw materials in parts by weight:
65-85 parts of mixed resin;
0.05-1 part of stabilizer;
1-4 parts of foaming agent;
0.3-4 parts of nucleating agent;
the mixed resin is formed by mixing polypropylene resin, high-density polyethylene resin, ethylene propylene diene monomer rubber and trimethylolpropane trimethacrylate;
the mixed resin is formed by mixing (0.2-0.4): (0.1-0.2): (0.04-0.06) of polypropylene resin, high-density polyethylene resin, ethylene propylene diene monomer and trimethylolpropane trimethacrylate according to the weight ratio of 1 (0.2-0.4).
2. The lightweight plastic bucket of claim 1, wherein: the mixed resin is formed by mixing polypropylene resin, high-density polyethylene resin, ethylene propylene diene monomer and trimethylolpropane trimethacrylate according to the weight ratio of 1:0.3:0.15:0.05.
3. The lightweight plastic bucket of claim 1, wherein: the melt flow rate of the polypropylene resin is 2.5g/10min-3.5g/10min, and the detection condition is 230 ℃/2.16kg; the melt flow rate of the high-density polyethylene resin is 0.5g/10min-0.8g/10min, and the detection condition is 190 ℃/2.16kg.
4. The lightweight plastic bucket of claim 1, wherein: the high-density polyethylene resin is also subjected to modification treatment, wherein the modification treatment steps are as follows: and mixing the high-density polyethylene resin, vinyl triethoxysilane and di-tert-butyl peroxide, and performing melt extrusion granulation to obtain the modified high-density polyethylene resin.
5. The lightweight plastic bucket of claim 4, wherein: the high-density polyethylene resin, the vinyl triethoxysilane and the di-tert-butyl peroxide are mixed according to the weight ratio of 1 (0.14-0.16) to 0.012-0.016.
6. The lightweight plastic bucket of claim 1, wherein: the thickness of the plastic layer is more than 0.3mm, and the total thickness of the light plastic barrel is 2.8-3.2mm.
7. The lightweight plastic bucket of claim 1, wherein: the tensile strength of the lightweight plastic barrel is 32.2-36.0MPa, and the density is 0.6-0.7g/cm 3 。
8. A method for manufacturing a lightweight plastic bucket as defined in any one of claims 1-7, comprising the steps of:
s1: mixing polypropylene resin, high-density polyethylene resin, ethylene propylene diene monomer and trimethylolpropane trimethacrylate, melting, extruding and granulating to obtain mixed resin, and then mixing with a stabilizer, a foaming agent and a nucleating agent to obtain a mixed raw material of a foaming material layer;
s2: mixing the plastic layer raw materials to obtain a plastic layer mixed raw material;
s3: adding the mixed raw materials of the foaming material layer in the step S1 and the mixed raw materials of the plastic layer in the step S2 into three dies arranged side by side, and performing injection molding to obtain the light plastic bucket with the three-layer structure of the plastic layer, the foaming material layer and the plastic layer.
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| WO2002085602A1 (en) * | 2001-04-20 | 2002-10-31 | Ispa, Inc. | Extrusion molding process |
| CN101081914A (en) * | 2007-07-06 | 2007-12-05 | 天津市润生塑胶制品有限公司 | Polypropylene expanded material and method for manufacturing same |
| EP3339358B1 (en) * | 2015-08-20 | 2020-12-02 | Kaneka Corporation | Polypropylene resin foamed particles, method for producing polypropylene resin foamed particles and polypropylene resin in-mold foam-molded article |
| US10335990B2 (en) * | 2017-06-28 | 2019-07-02 | Zhejiang Kingdom Plastics Industry Co., Ltd. | Composite floor and manufacturing method thereof |
| CN111844677A (en) * | 2020-06-24 | 2020-10-30 | 四川大学 | Multilayer foamed recycled plastic and preparation method thereof |
| CN113354899A (en) * | 2021-06-21 | 2021-09-07 | 武汉理工大学 | Light micro-foaming polypropylene composite material and preparation method thereof |
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