Long-chain branched high-density polyethylene material resistant to environmental stress cracking and preparation method thereof

Abstract

The invention discloses a long-chain branched high-density polyethylene material resisting environmental stress cracking and a preparation method thereof. According to the preparation method, long-chain branched modification is conducted on high-density polyethylene by selecting a melting reaction processing method to improve the environmental stress cracking resisting property of the material, branching generation is promoted by adding two-functionality-degree graft monomers, acrylic ester double bonds are adopted to stabilize the macromolecular free radicals and improve the branching efficiency, and meanwhile an efficient free radical regulating agent is added to regulate and control the activity of the macromolecular free radicals to inhibit crosslinking side reaction; the prepared long-chain branched high-density polyethylene has the low gel fraction, and long-branch-chain high-density polyethylene of which the branch chain length meets the stress cracking resisting requirement is obtained. The long-chain branched high-density polyethylene prepared through the preparation method has the excellent environmental stress cracking resisting property and the good comprehensive mechanical property.

Description

technical field

[0001] The invention relates to the field of polymer materials, in particular to a long-chain branched high-density polyethylene material resistant to environmental stress cracking and a preparation method thereof. Background technique

[0002] High-density polyethylene is a non-polar linear thermoplastic resin with high crystallinity. It has good physical and mechanical properties, high service temperature and good weather resistance. It is widely used in various plastic processing products. Capacity and demand continue to climb every year. However, due to the simple linear molecular chain structure of high-density polyethylene, it is easy to produce environmental stress cracking under stress. This shortcoming greatly limits the application range of high-density polyethylene, because the highly crystalline unmodified The molecular chain of HDPE is a linear structure, and there are few connecting molecules between crystal grains and wafers. Under stress, it ...

Examples

Embodiment 1

[0017] Embodiment 1 of the present invention: long-chain branched high-density polyethylene material resistant to environmental stress cracking, calculated in parts by mass, including 100 parts of high-density polyethylene (brand name: HD5218EA, MFR: 20), 0.05 parts of dimethyl Zinc dithiocarbamate, 1 part of neopentyl glycol diacrylate, 0.03 part of dicumyl peroxide and 0.05 part of antioxidant B215.

[0018] The preparation method of the long-chain branched high-density polyethylene material resistant to environmental stress cracking comprises high-density polyethylene, neopentyl glycol diacrylate, zinc dimethyl dithiocarbamate, over After dicumyl oxide and antioxidant B215 are fully mixed and uniform, they are added to a Φ65 twin-screw extruder for melt blending. The main engine speed is 400r / min, the reaction time is 2min, the temperature is 170°C, and the product is granulated. Some samples were taken for performance testing, and the results are shown in Table 1.

Embodiment 2

[0019] Example 2 of the present invention: long-chain branched high-density polyethylene material resistant to environmental stress cracking, calculated in parts by mass, including 100 parts of high-density polyethylene (brand name HD5218EA, MFR: 20), 0.15 parts of diisobutylene Dithiocarbamate zinc salt, 1 part of neopentyl glycol diacrylate, 0.05 part of dicumyl peroxide and 0.1 part of antioxidant B215.

[0020] The preparation method of the long-chain branched high-density polyethylene material resistant to environmental stress cracking comprises high-density polyethylene, neopentyl glycol diacrylate, zinc diisobutyldithiocarbamate, After dicumyl peroxide and antioxidant B215 are fully mixed, they are added to a Φ60 single-screw extruder for melt blending. The main engine speed is 60r / min, the reaction time is 4min, the temperature is 180°C, and the product is granulated. Some samples were taken for performance testing, and the results are shown in Table 1.

Embodiment 3

[0021] Example 3 of the present invention: long-chain branched high-density polyethylene material resistant to environmental stress cracking, calculated in parts by mass, including 100 parts of high-density polyethylene (grade 5000S, MFR: 1.2), 0.1 part of dimethyl Zinc dithiocarbamate, 1 part of neopentyl glycol diacrylate, 0.1 part of dicumyl peroxide and 0.2 part of antioxidant 1010.

[0022] The preparation method of the long-chain branched high-density polyethylene material resistant to environmental stress cracking comprises high-density polyethylene, neopentyl glycol diacrylate, zinc dimethyl dithiocarbamate, over After dicumyl oxide and antioxidant 1010 are fully mixed and uniform, they are added to a Φ65 single-screw extruder for melt blending. The main engine speed is 80r / min, the reaction time is 3min, the temperature is 170°C, and the product is granulated. . Some samples were taken for performance testing, and the results are shown in Table 1.

technical field

[0001] The invention relates to the field of polymer materials, in particular to a long-chain branched high-density polyethylene material resistant to environmental stress cracking and a preparation method thereof. Background technique

[0002] High-density polyethylene is a non-polar linear thermoplastic resin with high crystallinity. It has good physical and mechanical properties, high service temperature and good weather resistance. It is widely used in various plastic processing products. Capacity and demand continue to climb every year. However, due to the simple linear molecular chain structure of high-density polyethylene, it is easy to produce environmental stress cracking under stress. This shortcoming greatly limits the application range of high-density polyethylene, because the highly crystalline unmodified The molecular chain of HDPE is a linear structure, and there are few connecting molecules between crystal grains and wafers. Under stress, it ...

Examples

Embodiment 1

[0017] Embodiment 1 of the present invention: long-chain branched high-density polyethylene material resistant to environmental stress cracking, calculated in parts by mass, including 100 parts of high-density polyethylene (brand name: HD5218EA, MFR: 20), 0.05 parts of dimethyl Zinc dithiocarbamate, 1 part of neopentyl glycol diacrylate, 0.03 part of dicumyl peroxide and 0.05 part of antioxidant B215.

[0018] The preparation method of the long-chain branched high-density polyethylene material resistant to environmental stress cracking comprises high-density polyethylene, neopentyl glycol diacrylate, zinc dimethyl dithiocarbamate, over After dicumyl oxide and antioxidant B215 are fully mixed and uniform, they are added to a Φ65 twin-screw extruder for melt blending. The main engine speed is 400r / min, the reaction time is 2min, the temperature is 170°C, and the product is granulated. Some samples were taken for performance testing, and the results are shown in Table 1.

Embodiment 2

[0019] Example 2 of the present invention: long-chain branched high-density polyethylene material resistant to environmental stress cracking, calculated in parts by mass, including 100 parts of high-density polyethylene (brand name HD5218EA, MFR: 20), 0.15 parts of diisobutylene Dithiocarbamate zinc salt, 1 part of neopentyl glycol diacrylate, 0.05 part of dicumyl peroxide and 0.1 part of antioxidant B215.

[0020] The preparation method of the long-chain branched high-density polyethylene material resistant to environmental stress cracking comprises high-density polyethylene, neopentyl glycol diacrylate, zinc diisobutyldithiocarbamate, After dicumyl peroxide and antioxidant B215 are fully mixed, they are added to a Φ60 single-screw extruder for melt blending. The main engine speed is 60r / min, the reaction time is 4min, the temperature is 180°C, and the product is granulated. Some samples were taken for performance testing, and the results are shown in Table 1.

Embodiment 3

[0021] Example 3 of the present invention: long-chain branched high-density polyethylene material resistant to environmental stress cracking, calculated in parts by mass, including 100 parts of high-density polyethylene (grade 5000S, MFR: 1.2), 0.1 part of dimethyl Zinc dithiocarbamate, 1 part of neopentyl glycol diacrylate, 0.1 part of dicumyl peroxide and 0.2 part of antioxidant 1010.

[0022] The preparation method of the long-chain branched high-density polyethylene material resistant to environmental stress cracking comprises high-density polyethylene, neopentyl glycol diacrylate, zinc dimethyl dithiocarbamate, over After dicumyl oxide and antioxidant 1010 are fully mixed and uniform, they are added to a Φ65 single-screw extruder for melt blending. The main engine speed is 80r / min, the reaction time is 3min, the temperature is 170°C, and the product is granulated. . Some samples were taken for performance testing, and the results are shown in Table 1.

Images