阅读说明：本技术 一种耐低温聚乙烯塑料桶及其制备工艺 (Low-temperature-resistant polyethylene plastic barrel and preparation process thereof ) 是由 苏羽倩 钟元贤 何斌 刘理 乐红 于 2019-12-16 设计创作，主要内容包括：本发明公开了一种耐低温聚乙烯塑料桶,由包括以下重量份的原料制成：线性低密度聚乙烯40～48份、中密度聚乙烯15～20份、氧化聚乙烯8～11份、天然橡胶20～26份、甲基乙烯基苯基硅橡胶7～10份、聚苯醚10～14份、纳米二氧化硅6～8份。本发明的耐低温聚乙烯塑料桶通过精选原料组成,并优化各原料含量,各组分相容性良好,既充分发挥各自的优点,又相互补充,相互配合,起到良好的协同作用,使制得的耐低温聚乙烯塑料桶相比于普通聚乙烯材料,耐低温性能明显更优,说明其剪切应变与室温下接近,即其低温剪切性能良好,耐低温性能好。(The invention discloses a low-temperature-resistant polyethylene plastic barrel which is prepared from the following raw materials in parts by weight: 40-48 parts of linear low-density polyethylene, 15-20 parts of medium-density polyethylene, 8-11 parts of oxidized polyethylene, 20-26 parts of natural rubber, 7-10 parts of methyl vinyl phenyl silicone rubber, 10-14 parts of polyphenyl ether and 6-8 parts of nano silicon dioxide. The low-temperature resistant polyethylene plastic barrel is prepared by selecting raw materials, optimizing the content of each raw material, ensuring that the compatibility of each component is good, fully exerting the advantages of each component, complementing each other, and cooperating each other to play a good role in synergy, so that compared with the common polyethylene material, the prepared low-temperature resistant polyethylene plastic barrel has obviously better low-temperature resistance, which indicates that the shear strain is close to room temperature, namely the low-temperature shear performance is good and the low-temperature resistance is good.)

1. The low-temperature-resistant polyethylene plastic barrel is characterized by being prepared from the following raw materials in parts by weight:

40-48 parts of linear low-density polyethylene,

15-20 parts of medium density polyethylene,

8-11 parts of oxidized polyethylene

20-26 parts of natural rubber,

7-10 parts of methyl vinyl phenyl silicone rubber,

10-14 parts of polyphenyl ether,

6-8 parts of nano silicon dioxide.

2. The low temperature resistant polyethylene plastic bucket according to claim 1, wherein the low temperature resistant polyethylene plastic bucket is made of the following raw materials in parts by weight:

44 parts of linear low-density polyethylene,

17.5 parts of medium density polyethylene,

Oxidized polyethylene 9 parts

23 parts of natural rubber,

9 parts of methyl vinyl phenyl silicone rubber,

12 parts of polyphenyl ether,

And 7 parts of nano silicon dioxide.

3. The low temperature resistant polyethylene plastic bucket according to claim 1, further comprising the following raw materials in parts by weight: 2.5-4.5 parts of antioxidant.

4. The low temperature resistant polyethylene plastic tub of claim 3, wherein the antioxidant is a mixture of antioxidant 1010 and antioxidant 1076.

5. The low temperature resistant polyethylene plastic tub according to claim 4, characterized in that the mass ratio of antioxidant 1010 and antioxidant 1076 in the mixture of antioxidant 1010 and antioxidant 1076 is 1: 0.65 to 0.75.

6. The low temperature resistant polyethylene plastic bucket according to claim 1, further comprising the following raw materials in parts by weight: 3-4.5 parts of a heat stabilizer.

7. The low temperature resistant polyethylene plastic bucket of claim 6, wherein the heat stabilizer is heat stabilizer 9017A-1.

8. The low temperature resistant polyethylene plastic bucket according to claim 1, further comprising the following raw materials in parts by weight: 3.5-4.5 parts of ultraviolet absorbent.

9. The low temperature resistant polyethylene plastic tub of claim 8, wherein the ultraviolet absorber is ultraviolet absorber UV-329.

10. A process for the preparation of a low temperature resistant polyethylene plastic drum as claimed in any one of claims 1 to 9, comprising the steps of:

A. respectively weighing the raw materials of the low-temperature-resistant polyethylene plastic barrel, and uniformly mixing to obtain a mixed material;

B. feeding the mixed material into an injection molding machine for melting and mixing to obtain a mixed melt; and carrying out an injection molding process on the mixed melt to obtain the low-temperature-resistant polyethylene plastic barrel.

Technical Field

The invention relates to the technical field of high polymer materials, in particular to a low-temperature-resistant polyethylene plastic barrel and a preparation process thereof.

Background

Polyethylene (PE) is a thermoplastic resin prepared by polymerizing ethylene, and industrially also comprises a copolymer of ethylene and a small amount of α -olefin, and the polyethylene is odorless, nontoxic, has a wax-like hand feeling, has excellent low-temperature resistance (the lowest use temperature can reach-100 to-70 ℃), good chemical stability, can resist corrosion of most of acid and alkali (cannot resist acid with oxidation property), is insoluble in common solvents at normal temperature, and has small water absorption and excellent electrical insulation.

The polyethylene is classified into high density polyethylene, low density polyethylene and linear low density polyethylene according to the polymerization method, molecular weight and chain structure.

Low Density Polyethylene (LDPE), commonly known as high pressure polyethylene, is used mainly in plastic bags, agricultural films, etc. because of its relatively low density and the softest material.

High Density Polyethylene (HDPE), commonly known as low pressure polyethylene, has higher temperature resistance, oil resistance, vapor permeability resistance and environmental stress crack resistance compared with LDPE and LLDPE, has good electrical insulation, impact resistance and cold resistance, and is mainly applied to the fields of blow molding, injection molding and the like.

Linear Low Density Polyethylene (LLDPE), which is a copolymer of ethylene and a small amount of a higher α -olefin polymerized in the presence of a catalyst, is similar in appearance to LDPE, is poor in transparency, but has good surface gloss, and has the advantages of low temperature toughness, high modulus, bending and stress cracking resistance, good impact strength at low temperature, and the like.

Polyethylene can be formed by extrusion, injection, molding, blow molding, melt spinning and the like, is widely applied to industry, agriculture, packaging and daily industry, is quite widely applied in China, is the largest user of the polyethylene, consumes about 77 percent of low-density polyethylene and 18 percent of high-density polyethylene, and occupies a larger proportion in the consumption structure of injection molded products, electric wires and cables, hollow products and the like, and plays a very important role in the plastic industry.

Although the application field of polyethylene is very wide, LLDPE and HDPE are in the growth stage of the life cycle at present; LDPE gradually entered the development maturation stage at the end of the 1980 s. However, the plastic buckets currently made of PE still have the following problems:

1. the low temperature resistance is poor, and the paint is not suitable for being used in a low temperature environment;

2. the mechanical properties such as tensile strength and the like are poor, so that the comprehensive use performance is poor.

Based on the situation, the invention provides a low-temperature-resistant polyethylene plastic barrel and a preparation process thereof, and the problems can be effectively solved.

Disclosure of Invention

The invention aims to provide a low-temperature-resistant polyethylene plastic barrel and a preparation process thereof. The low-temperature resistant polyethylene plastic barrel is prepared by selecting raw materials, optimizing the content of each raw material, selecting linear low-density polyethylene, medium-density polyethylene, oxidized polyethylene, natural rubber, methyl vinyl phenyl silicone rubber, polyphenyl ether, nano silicon dioxide and the like in proper proportion, and having good compatibility of each component, fully playing respective advantages, complementing each other, and cooperating each other to play a good synergistic effect, so that the shear modulus of the prepared low-temperature resistant polyethylene plastic barrel is only slightly increased after the barrel is stored for 5 hours at the temperature of-30 ℃, and compared with a common polyethylene material, the low-temperature resistant polyethylene plastic barrel has obviously better low-temperature resistance, and shows that the shear strain is close to the room temperature, namely the low-temperature shear performance is good, and the low-temperature resistant performance is good.

In order to solve the technical problems, the technical scheme provided by the invention is as follows:

a low-temperature-resistant polyethylene plastic barrel is prepared from the following raw materials in parts by weight:

40-48 parts of linear low-density polyethylene,

15-20 parts of medium density polyethylene,

8-11 parts of oxidized polyethylene

20-26 parts of natural rubber,

7-10 parts of methyl vinyl phenyl silicone rubber,

10-14 parts of polyphenyl ether,

6-8 parts of nano silicon dioxide.

The low-temperature resistant polyethylene plastic barrel is prepared by selecting raw materials, optimizing the content of each raw material, selecting linear low-density polyethylene, medium-density polyethylene, oxidized polyethylene, natural rubber, methyl vinyl phenyl silicone rubber, polyphenyl ether, nano silicon dioxide and the like in proper proportion, and having good compatibility of each component, fully playing respective advantages, complementing each other, and cooperating each other to play a good synergistic effect, so that the shear modulus of the prepared low-temperature resistant polyethylene plastic barrel is only slightly increased after the barrel is stored for 5 hours at the temperature of-30 ℃, and compared with a common polyethylene material, the low-temperature resistant polyethylene plastic barrel has obviously better low-temperature resistance, and shows that the shear strain is close to the room temperature, namely the low-temperature shear performance is good, and the low-temperature resistant performance is good.

Preferably, the low-temperature resistant polyethylene plastic barrel is prepared from the following raw materials in parts by weight:

44 parts of linear low-density polyethylene,

17.5 parts of medium density polyethylene,

Oxidized polyethylene 9 parts

23 parts of natural rubber,

9 parts of methyl vinyl phenyl silicone rubber,

12 parts of polyphenyl ether,

And 7 parts of nano silicon dioxide.

Preferably, the low-temperature resistant polyethylene plastic barrel further comprises the following raw materials in parts by weight: 2.5-4.5 parts of antioxidant.

Preferably, the antioxidant is a mixture of antioxidant 1010 and antioxidant 1076.

Preferably, the mass ratio of the antioxidant 1010 to the antioxidant 1076 in the mixture of the antioxidant 1010 and the antioxidant 1076 is 1: 0.65 to 0.75.

Preferably, the low-temperature resistant polyethylene plastic barrel further comprises the following raw materials in parts by weight: 3-4.5 parts of a heat stabilizer.

Preferably, the heat stabilizer is heat stabilizer 9017A-1.

Preferably, the low-temperature resistant polyethylene plastic barrel further comprises the following raw materials in parts by weight: 3.5-4.5 parts of ultraviolet absorbent.

Preferably, the ultraviolet absorbent is an ultraviolet absorbent UV-329.

The invention also provides a preparation process of the low temperature resistant polyethylene plastic barrel, which comprises the following steps:

A. respectively weighing the raw materials of the low-temperature-resistant polyethylene plastic barrel, and uniformly mixing to obtain a mixed material;

B. feeding the mixed material into an injection molding machine for melting and mixing to obtain a mixed melt; and carrying out an injection molding process on the mixed melt to obtain the low-temperature-resistant polyethylene plastic barrel.

Compared with the prior art, the invention has the following advantages and beneficial effects:

the low-temperature resistant polyethylene plastic barrel is prepared by selecting raw materials, optimizing the content of each raw material, selecting linear low-density polyethylene, medium-density polyethylene, oxidized polyethylene, natural rubber, methyl vinyl phenyl silicone rubber, polyphenyl ether, nano silicon dioxide and the like in proper proportion, and having good compatibility of each component, fully playing respective advantages, complementing each other, and cooperating each other to play a good synergistic effect, so that the shear modulus of the prepared low-temperature resistant polyethylene plastic barrel is only slightly increased after the barrel is stored for 5 hours at the temperature of-30 ℃, and compared with a common polyethylene material, the low-temperature resistant polyethylene plastic barrel has obviously better low-temperature resistance, and shows that the shear strain is close to the room temperature, namely the low-temperature shear performance is good, and the low-temperature resistant performance is good.

The preparation process is simple, the operation is simple and convenient, and the manpower and equipment cost are saved.

Detailed Description

In order that those skilled in the art will better understand the technical solutions of the present invention, the following description of the preferred embodiments of the present invention is provided in connection with specific examples, which should not be construed as limiting the present patent.

The test methods or test methods described in the following examples are conventional methods unless otherwise specified; the reagents and materials, unless otherwise indicated, are conventionally obtained commercially or prepared by conventional methods.