CN1138150A

CN1138150A - Ethylene-vinyl acetate copolymer modified polyethylene plastic pipe

Info

Publication number: CN1138150A
Application number: CN 95106355
Authority: CN
Inventors: 王远声
Original assignee: Individual
Current assignee: Individual
Priority date: 1995-06-13
Filing date: 1995-06-13
Publication date: 1996-12-18
Anticipated expiration: 2015-06-13
Also published as: CN1042855C

Abstract

The invention relates to an ethylene-vinyl acetate polymer modified polyethylene plastic hose, which comprises 70-85% of linear low-density high-pressure polyethylene, 5-15% of low-density high-pressure polyethylene and 5-20% of ethylene-vinyl acetate copolymer, and appropriate amount of filler and pigment can be added, and the strength and physical properties of the product are superior to those of all other rubber and plastic pipes.

Description

Ethene---vinyl acetate copolymer modified polyethylene plastic pipe

The present invention is a kind of ethene---the vinyl acetate copolymer modified polyethylene plastic flexible pipe belongs to the plastic article class.

The existing tubing that covers has PVC (PVC) flexible pipe at present, the ledger line polyvinyl chloride hose, canvas hose, wireless rubber pipe, ledger line rubber pipe, and flexible plastic tube, the polyethylene from high pressure process flexible pipe, though these tubing have good practicability, chemical resistance, ageing resistance, low temperature resistant, high warm nature is poor, compressive strength is low, except that the multilayer ledger line rubber pipe of special processing, other covers the tubing compressive strength all below 0.2-0.4Mpa.

All good polyethylene from high pressure process material fat (PE) is main raw material to the objective of the invention is to select to adopt mechanical property and physical property, dose with it and dissolve each other, (EVA) modification of the ethene of performance complement---acetate ethylene copolymer and enhancing, make have extremely strong tear strength, tensile strength and good toughness, elasticity, superelevation compressive strength and excellent environmental stress resistance cracking, the product of resistance to chemical attack.

Of the present invention theing contents are as follows:

Its fundamental composition formula rate is as follows:

Linear paper density polyethylene from high pressure process (L-LDPE) 70-85%

Low-density high-pressure polyethylene (LDPE) 5-15%

Ethene---acetate ethylene copolymer (EVA) 5-20%

Can add the calcium bicarbonate or the calcium carbonate powder that account for gross weight 0-30% for reducing cost is bulking agent; In order to make product have specific color, can add certain colorant.

Used linea low density polyethylene from high pressure process in the above-mentioned batching, available kind is a lot of, as commercially available GF-0218-D, FW1290, HMLL-240A, LPXT, F32F etc.; Employed low-density high-pressure polyethylene has LTA-002, PS8018, LPX-81, YK30, PE-1028 etc.

Take by weighing raw material by above-mentioned formula range, add in the extrusion press, 110 °-150 ℃ heating 3-5 minute, make its plasticizing, extruding is then stretched with the mouth die drawing of trombone slide, cooling, and calendering, the traction moulding is coiled then, is packaged as finished product.Shown in its technological process accompanying drawing 1, employed equipment is the extruding unit of knowing altogether in the plastics industry.Use different trombone slide mouth moulds can produce the flexible pipe of different size, there are two kinds of texture type, smooth types on its surface, surface texture does not have actual influence to the hose technology performance, the transparency height of smooth type, this product wall thickness is 0.2-1.2mm, diameter 20-370mm, length can be carried into random lengths as required, hydraulic pressure resistance intensity can reach 1,5Mpa, low temperature resistant reaching-70 ℃, the fracture rate elongation is 600-950%, more than the tensile strength 34-42Mpa, more than the characteristic tear strength 400KN/m, impact strength is 105-150Ml/m ², its technical performance is better than other rubber and plastic tubing.

Advantage of the present invention is:

(1) the thin weight of wall is low, light, and it is bundled to roll over flat coiling, transportation and keeping are convenient, especially the above-mentioned technical performance of tool: can be widely used in agricultural, industry, civilian water delivery, carry soda acid and lightweight oils, discharge of industrial wastes and wind send light material, mine drainage underground, ventilation etc.

Because this kind product goods is light, raw materials consumption is few, product cost reduces significantly, have the extremely strong market competitiveness, be used for agricultural drainage and irrigation and can reduce farm investment, economize on water, save land, improve crop yield, promote agricultural development, it is few to develop this technological investment, can adopt small-sized extrusion molding unit to go into operation, kind and model that raw material can Gong be selected for use are many, can guarantee raw material supply.

Embodiment, as shown in table 1,

Table 1

Sequence number	The PE model	Melt index	Density	The PE model	Melt index	Density	The EVA resin	The cooperation ratio	Products characteristics
Sequence number	The PE model	Melt index	Density	The PE model	Melt index	Density	The EVA resin	The cooperation ratio	Products characteristics	1	?GF-0218-D	2.0	??0.918	??LJA-002	??0.3	??0.912	??EVA14/5	??85∶5∶10	Intensity is good
2	?FW1290	1.0	??0.99	??PS8018	??1.0	??0.98	??EVA14/5	??85∶5∶10	Cost is low relatively	1	?GF-0218-D	2.0	??0.918	??LJA-002	??0.3	??0.912	??EVA14/5	??85∶5∶10	Intensity is good
2	?FW1290	1.0	??0.99	??PS8018	??1.0	??0.98	??EVA14/5	??85∶5∶10	Cost is low relatively	3	?HMLL-240A	1.0	??0.919	??LPX-81	??1.0	??0.98	??EVA14/5	??70∶15∶15	The transparency height, low temperature resistant degree anti-corrosion property can be good
4	?LP×1	1.0	??0.918	??YK30	??4.0	??0.920	??EVA14/5	??70∶15∶15	The transparency height, low temperature resistant degree anti-corrosion property can be good	3	?HMLL-240A	1.0	??0.919	??LPX-81	??1.0	??0.98	??EVA14/5	??70∶15∶15
4	?LP×1	1.0	??0.918	??YK30	??4.0	??0.920	??EVA14/5	??70∶15∶15		5	?F32F	1.0	??0.918	??PE-1028	??2.0	??0.98	??EVA14/5	??80∶5∶18	The transparency height, low temperature resistant degree anti-corrosion property can be good

High strength PE flexible pipe flow

Fig. 1

Claims

1, a kind of ethene---vinyl acetate copolymer modified polyethylene plastic flexible pipe is characterized in that the fundamental composition proportioning is as follows:

Linea low density polyethylene from high pressure process 70-85%

Low-density high-pressure polyethylene 5-15%

Ethene---acetate ethylene copolymer 5-20%.

2, ethene according to claim 1---vinyl acetate copolymer modified polyethylene plastic flexible pipe is characterized in that still can adding in the described batching appropriate amount calcium bicarbonate or light calcium carbonate powder as bulking agent.

3, ethene according to claim 1---vinyl acetate copolymer modified polyethylene plastic flexible pipe, it is characterized in that can be according to using needs to dose the colorant of suitable kind and quantity in the described batching.