CN104610656A - High and low temperature resin material for plastic coating (impregnating) of steel wire ropes - Google Patents

Abstract

The invention discloses a high and low temperature resin material for the plastic coating (impregnating) of steel wire ropes, and the high and low temperature resin material comprises the following three components in percentage by mass: 60-75% of polypropylene, 15-30% of an ethylene/alpha-olefin copolymerized elastomer and 4-10% of polyethylene, and the sum of mass percentages of the three components is 100%. The high and low temperature resin material disclosed by the invention has good high and low temperature resistance; through adding the other two chemical components in the PP, the resin material has an excellent high and low temperature performance, thereby overcoming insufficiencies and defects in the prior art and optimizing the performances of plastic-coated (plastic-impregnated) steel wire ropes.

Description

A kind of high and low temperature resin material for injection molding of steel wire rope bag

technical field

The invention belongs to the technical field of resin materials, and relates to a high-low temperature resin material for injection molding of steel wire rope bags.

Background technique

In recent years, in order to improve the service life of steel wire ropes, in the manufacturing process of steel wire ropes for open-pit mines and construction machinery, the research and development and manufacture of plastic-coated (injection) steel wire ropes have attracted greater attention from industry scientists. For the steel wire rope manufacturing industry, the development of domestic steel wire rope technology has been quite mature, and the performance of the resin used for wrapping (injection) molding has always been a bottleneck restricting the development of this type of steel wire rope. As a steel wire rope (injection) plastic resin, its performance should meet the following three points: first, it has good performance in a wide temperature range, that is, it has excellent high and low temperature performance; second, it has good impact resistance; third, it has Good toughness. At present, most of the resins used in wire rope wrapping (injection) molding can only meet the performance above 0°C, so a resin with excellent high and low temperature performance is urgently needed in the industry.

Contents of the invention

The object of the present invention is to provide a high and low temperature resin material for steel wire rope wrapping injection molding, which solves the problem in the prior art that the performance of the resin used in the steel wire rope wrapping (injection) molding only satisfies above 0°C and cannot meet the high and low temperature performance.

The technical solution adopted in the present invention is that a high and low temperature resin material for injection molding of steel wire rope bags is composed of the following three components according to its mass percentage:

Polypropylene is 60% to 75%,

Ethylene/α-olefin copolymerized elastomer is 15% to 30%,

Polyethylene is 4% to 10%,

The mass of the three components adds up to 100%.

The high and low temperature resin for steel wire rope plastic coating of the present invention is also characterized in that:

Both polypropylene and low-pressure high-density polyethylene are granular, and ethylene/α-olefin copolymer elastomers are granular translucent crystals.

The beneficial effect of the invention is that the service temperature is -45°C to 30°C, and it has good high and low temperature performance, especially good low temperature toughness. According to the different requirements of users, by adding different proportions of B and C two chemical products in component A, it can provide general formula for high and low temperature resistance, resin formula for high and low temperature wear resistance and extrusion resistance, and high and low temperature impact resistance. The high performance and high toughness formula enable the resin to better adapt to various harsh environments and increase the application field of plastic-coated (injection) steel wire ropes.

Detailed ways

The present invention will be described in detail below in combination with specific embodiments.

The high and low temperature resin material for injection molding of the steel wire rope bag of the present invention is composed of the following three components according to its mass percentage:

A component: polypropylene (referred to as PP) is 60% to 75%,

Component B: Ethylene/α-olefin copolymerized elastomer (referred to as POE) is 15% to 30%,

Component C: 4% to 10% of low-pressure high-density polyethylene (referred to as PE),

The three components of PP, POE and PE are sold publicly, and the total quality is 100%.

In the following preferred embodiments of the present invention, component A is granular, component B is granular translucent crystals, and component C is granular.

The high and low temperature resin material for injection molding of the steel wire rope bag of the present invention is prepared according to the following steps:

Step 1: Weigh the three components according to the above proportions, and mix and stir for 10 minutes to 15 minutes;

Step 2: Heat the mixture in the extruder, and the heating temperature range is 190°C to 220°C;

Step 3: Keep warm for 1h-2h to ensure that the mixture is completely melted;

Step 4: Turn on the extruder, and the extrusion speed of the host screw is 3 to 6 rpm;

Step 5: Cut the resin extrusion die (resin strip with a diameter of 2-5mm) into 3mm pellets with a pelletizer, and air-cool it to form it.

Example 1

The mass ratio of each component is: polypropylene (PP) 64%, ethylene/alpha olefin copolymerized elastomer (POE) 30%, low-pressure high-density polyethylene (PE) 6%, and the total is 100%. The high and low temperature resin formula obtained according to the above preparation method meets the injection molding performance requirements of general steel wire rope bales.

Example 2

The mass ratio of each component is: 70% of polypropylene (PP), 26% of ethylene/α-olefin copolymerized elastomer (POE), 4% of low-pressure high-density polyethylene (PE), and the total is 100%. The high-low temperature resin formula obtained according to the above-mentioned preparation method meets the performance requirements of wear resistance and extrusion resistance.

Example 3

The mass ratio of each component is: 60% of polypropylene (PP), 30% of ethylene/α-olefin copolymerized elastomer (POE), 10% of low-pressure high-density polyethylene (PE), and the total is 100%. The high and low temperature resin formula obtained according to the above preparation method meets the performance requirements of impact resistance and high toughness.

The high and low temperature resin material for injection molding of steel wire rope bags of the present invention has good high/low temperature resistance, which solves the deficiencies and defects of the prior art. By adding two other chemical components to PP, the resin has excellent high and low temperature performance. The low-temperature performance optimizes the performance of the plastic-coated (injection) steel wire rope, thereby further expanding the application field of the plastic-coated (injection) steel wire rope.

Claims (2)

1. a wireline bag injection moulding high/low temperature resin material, is characterized in that, calculates by its mass percent, is made up of following three kinds of components:

Polypropylene is 60% ~ 75%,

Ethylene/alpha-olefin copolymer elastomer is 15% ~ 30%,

Polyethylene is 4% ~ 10%,

The quality of three kinds of components adds up to 100%.

2. wireline bag injection moulding high/low temperature resin material according to claim 1, it is characterized in that: described polypropylene and polyethylene all select particulate state, ethylene/alpha-olefin copolymer elastomer selects the translucent crystal of particulate state.