CN201240088Y

CN201240088Y - Polyethylene high performance rotational molding product with three-layered structure

Info

Publication number: CN201240088Y
Application number: CNU2008200878849U
Authority: CN
Inventors: 孙绍灿
Original assignee: Individual
Current assignee: Individual
Priority date: 2008-05-29
Filing date: 2008-05-29
Publication date: 2009-05-20
Anticipated expiration: 2018-05-29

Abstract

The utility model relates to a high-performance rotational molding product with a polyethylene three-layer structure, which comprises a rotational molding grade LLDPE outer layer raw material, a foaming belt crosslinking polyethylene middle layer raw material, and a crosslinking HDPE inner layer raw material. The utility model has a three-layer structure comprising three layers of different polyethylene, reaches a purpose that the three-layer advantages are complement, has the advantages of punch resistance, weather resistance, high bending rigidity resistance, and low cost and the like, and can be used in the project with temperature resistance less than 100 DEG, the pressure 0.6 M p a, and heat preservation requirement, so that the common polyethylene plastic can be engineered.

Description

A kind of polyethylene three-decker high-performance rotomoulded articles

(1) technical field

The utility model relates to a kind of rotomoulded articles.

(2) background technology

Produce hollow product small-sized, that batch is big, adopt hollow molding most economical; Adopt rotation molding most economical if produce large-scale, little in batches goods, especially produce the non-rotation molding of super-huge, baroque hollow product and do not belong to.But general rotomoulded articles is to be raw material with the polyethylene, and structure single (being non-foaming or foaming), and this goods can only be used for life or fishery owing to mechanical performance, hot property are lower.If will expand on the engineerings such as chemical industry, environmental protection, select the high engineering resin of price for use or increase wall thickness, the former resin washability is little, price is high, popularization is had any problem, the amplitude that latter's performance improves is little, and thickness is when being increased to 30mm, and not only the production cycle increases greatly, can produce the melt trickling simultaneously, cause percent defective to improve.

(3) summary of the invention

In order to overcome the above-mentioned deficiency of existing rotomoulded articles, the polyethylene three-decker high-performance rotomoulded articles that the utility model provides that a kind of moulding is simple, good combination property, cost are low, be easy to promote.

The technical scheme in the invention for solving the technical problem is: a kind of polyethylene three-decker high-performance rotomoulded articles is that skin, the raw material of rotational moulding level LLDPE is that the intermediate layer of foaming band crosslinked polyethylene, the internal layer that raw material is crosslinked HDPE constitute by raw material.

Recommend described outer field thickness to account for 1/3 of gross thickness, the thickness in described intermediate layer accounts for 1/2 of gross thickness, and described internal layer accounts for 1/6 of gross thickness.

Further, recommend described outer field thickness greater than 6mm, the thickness of described internal layer is greater than 2mm.

Skin of the present utility model is a supporting course, requires anti-impact, weather-proof and intensity, selects rotational moulding level LLDPE resin for use, guarantees certain intensity with thickness.

The intermediate layer requires good heat insulation, and has good flexural rigidity, selects polyethylene foamed for use, and its reason is: 1. the thermal conductivity factor of foamed plastics is about 0.043W/ (m.k), is 1/10 of non-foamed plastic; 2. bending stiffness is the three cubed function of wall thickness, and than the increased thickness that does not foam, it is obvious to increase bending stiffness with the resin molded foam of same weight.But other mechanical strength of foaming product will reduce, permeability will improve, and can adopt following method to remedy: 1. adopt the low foaming that adds crosslinking agent, expansion ratio is below 3 times, and it is crosslinked to improve intensity to foam; Infiltration problem by add one deck not foamed plastic (being internal layer) solve.

Internal layer requires heatproof, antiseepage, selects crosslinked high density polyethylene (HDPE) for use, and its former so resin heatproof has 100 ℃ (the LLDPE heatproof has only about 65 ℃), has solved the deficiency of foamed plastics fluid permeability again.

The beneficial effects of the utility model are: adopt three layers of different polyethylene to form three-decker, reach three layers of mutual supplement with each other's advantages, have characteristics such as anti-impact, weather-proof, the height of anti-bending stiffness the, heatproof and cost be low, can be applied to heatproof below 100 ℃, withstand voltage 0.6Mpa and have on the engineering that insulation requires, make the common polythene plastic engineeringization.

(4) description of drawings

Fig. 1 is a structural representation of the present utility model.

(5) specific embodiment

Below in conjunction with the drawings and specific embodiments the utility model is described in further detail.

With reference to Fig. 1, a kind of polyethylene three-decker high-performance rotomoulded articles is a kind of pressure vessels for the chemical industry in the present embodiment, form by skin 1, intermediate layer 2 and internal layer 3, outer 1 raw material is rotational moulding level LLDPE, and intermediate layer 2 raw materials are foaming band crosslinked polyethylenes, and internal layer 3 raw materials are crosslinked HDPE.Outer 1 thickness is 10mm, and the thickness in intermediate layer 2 is 15mm, and the thickness of internal layer 3 is 5mm.Adopt three layers of different polyethylene to form three-decker, reach three layers of mutual supplement with each other's advantages, have characteristics such as anti-impact, weather-proof, the height of anti-bending stiffness the, heatproof and cost are low, can be applied to heatproof below 100 ℃, withstand voltage 0.6Mpa and have on the engineering that insulation requires, make the common polythene plastic engineeringization.

Claims

1. polyethylene three-decker high-performance rotomoulded articles is characterized in that: by raw material is that skin, the raw material of rotational moulding level LLDPE is that the intermediate layer of foaming band crosslinked polyethylene, the internal layer that raw material is crosslinked HDPE constitute.

2. polyethylene three-decker high-performance rotomoulded articles as claimed in claim 1, it is characterized in that: described outer field thickness accounts for 1/3 of gross thickness, and the thickness in described intermediate layer accounts for 1/2 of gross thickness, and described internal layer accounts for 1/6 of gross thickness.

3. polyethylene three-decker high-performance rotomoulded articles as claimed in claim 1 or 2, it is characterized in that: described outer field thickness is greater than 6mm.

4. polyethylene three-decker high-performance rotomoulded articles as claimed in claim 1 or 2, it is characterized in that: the thickness of described internal layer is greater than 2mm.