Unlock instant, AI-driven research and patent intelligence for your innovation.

rotationally molded polyethylene composition

A technology of rotational molding and polyethylene, applied in the field of polyethylene composition, to achieve the effects of reduced porosity, high product yield, and high surface smoothness

Active Publication Date: 2020-09-04
PETROCHINA CO LTD
View PDF13 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

After surface modification, the added desiccant can improve its compatibility with polyethylene. During the rotational molding process, the desiccant accumulates on the inner surface and absorbs the water vapor between the accumulation spaces of polyethylene powder, which effectively solves the problem of product compatibility. Pore ​​problem at the mold

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0073] In the rotationally molded polyethylene composition, the desiccant is barium oxide, and the content is 40,000 ppm (in terms of gram of medium density polyethylene as the benchmark); the antioxidants are 2,6-di-tert-butyl-4-methylphenol and tris(1,4-di-tert-butylphenyl)phosphite, the content of which is 2500ppm (based on gram of medium density poly ethylene as a benchmark); the release agent is calcium stearate, with a content of 3000ppm (based on per gram of medium density polyethylene); the ultraviolet light absorber is UV944, with a content of 1000ppm.

[0074] Above-mentioned polyethylene composition is 6g / 10min at 2.16kg weight melt flow rate, and density is 0.933g / cm 3 . The polyethylene composition is made into a standard piece of 20cm*20cm*20cm by rotational molding, and the number of air holes on the six sides is 8 in total.

Embodiment 2

[0076] In the rotationally molded polyethylene composition, the desiccant is calcium sulfate, and after the surface modification of the coated polyethylene (the loading of the ethylene homopolymer coating is 20%), the content is 70,000 ppm (in terms of gram of medium density polyethylene as the benchmark); the antioxidants are 2,6-di-tert-butyl-4-methylphenol and β-(3,5-di-tert-butyl-4-hydroxyphenyl) octadecyl propionate, and the content is 1000ppm (based on per gram of medium density polyethylene); the release agent is calcium stearate, with a content of 4000ppm (based on per gram of medium density polyethylene); the ultraviolet light absorber is UV944, with a content of 1400ppm.

[0077] The above-mentioned polyethylene composition has a melt flow rate of 10g / 10min and a density of 0.930g / cm at a weight of 2.16kg 3 . The polyethylene composition is made into a standard piece of 20cm*20cm*20cm by rotational molding, and the number of air holes on the six sides is 15 in total...

Embodiment 3

[0079] In the rotationally molded polyethylene composition, the desiccant is phosphorus pentoxide, and the content is 20,000 ppm (in terms of medium density per gram) after the surface modification of the coated polyethylene (the loading of the ethylene homopolymer coating film is 8%). polyethylene as the benchmark); the antioxidant is 1,3,5-tris(3,5-di-tert-butyl-4-hydroxybenzyl) isocyanuric acid, with a content of 4000ppm (based on each gram of medium density polyethylene ); the release agent is calcium stearate, with a content of 100ppm (based on per gram of medium density polyethylene); the ultraviolet light absorber is 2-hydroxyl-4-methoxybenzophenone, with a content of 2000ppm.

[0080] The above-mentioned polyethylene composition has a melt flow rate of 1g / 10min and a density of 0.930g / cm at a weight of 2.16kg 3. The polyethylene composition is made into a standard piece of 20cm*20cm*20cm by rotational molding, and the number of air holes on the six sides is 38 in tota...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
particle sizeaaaaaaaaaa
densityaaaaaaaaaa
melt flow indexaaaaaaaaaa
Login to View More

Abstract

The invention relates to a rotation moulding polyethylene composition. The composition is comprised of medium-density polyethylene and an additive agent, the additive agent is prepared by compoundinga surface modification drying agent, an anti-oxidant, a releasing agent and a light absorbent, the polyethylene is covered with the surface drying agent, an ethene homopolymer is formed and the compatibility of the inorganic filling material is improved. The gas hole of the product surface can be solved by the addition of the surface modification drying agent, the processing property of the product is improved, and the products can satisfy the requirements of the rotation moulding products.

Description

technical field [0001] The present invention relates to a polyethylene composition, in particular a rotationally molded polyethylene composition. Background technique [0002] Rotational molding is to crush polyethylene and add it to the mold to heat and make it rotate continuously along two mutually perpendicular axes to form the desired shape and then cool it. Compared with injection molding and blow molding processes, rotational molding has the outstanding advantages of less investment in equipment and molds, and is suitable for the production of medium and large plastic products with complex shapes. The products have almost no internal stress and are not easy to deform. Due to the continuous improvement of the performance of special resins for rotational molding and the continuous improvement of rotational molding equipment, the rotational molding process has been developed rapidly. [0003] With the development of rotational molding process, the types of polyethylene r...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): C08L23/06C08K9/10C08K3/22C08K3/30C08K3/16C08K3/36
CPCC08K3/16C08K3/22C08K3/30C08K3/36C08K9/10C08K2003/162C08K2003/2206C08K2003/3045C08K2003/3063C08L23/06
Inventor 马丽王文燕王立娟任鹤李冬霞孙彬彬杨琦和树立张瑞王华宋磊高宇新姜进宪张德英王世华李瑞
Owner PETROCHINA CO LTD