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One-step heat preservation polypropylene random copolymer (PP-R) pipe and preparation method thereof

A PP-R and pipe technology, applied in the direction of heat preservation and protection of pipes and pipes through heat insulation, can solve the problems of short service life of heat preservation materials, no heat preservation measures, and slow secondary construction speed, and achieve color diversification, The effect of thermal insulation is remarkable and the effect of improving production efficiency

Active Publication Date: 2015-02-25
RIFENG ENTERPRISE GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Although the thermal conductivity of PP-R is 0.21w / mk, which is only 1 / 200 of that of steel pipes, it still has relatively high thermal conductivity during the long-term use of hot water pipes, especially when the pipes are long and the temperature difference is large. large heat loss
The current PP-R pipes are used for the transportation of hot water, and basically no insulation measures are taken. Even if there are insulation measures, they are still insulated by jacketing insulation materials. The secondary construction speed is slow, the process is complicated, and the service life of the insulation materials is short. , need to be replaced frequently, resulting in higher cost

Method used

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  • One-step heat preservation polypropylene random copolymer (PP-R) pipe and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Example 1: Prepare a thermal insulation PP-R pipe, PP-R inner pipe specification S2.520*3.4 (white), foamed polyethylene outer layer thickness 5mm, white.

[0032] The preparation method is as follows:

[0033] (1) Mix the low-density polyethylene and the white outer layer masterbatch according to the ratio of parts by mass of 100:2, fully stir with a high-speed mixer for 5-10 minutes, and then extrude and granulate through a twin-screw extruder. The processing temperature is controlled at Between 170-200°C, get the spare pellets for the outer layer;

[0034] (2) Mix PP-R resin and white inner tube color masterbatch according to the ratio of parts by mass of 100:2, fully stir with a high-speed mixer for 5-10 minutes, and then extrude and granulate through a twin-screw extruder. The processing temperature is controlled at Between 170-220°C, special pellets for PP-R inner tubes are obtained;

[0035] (3) Then put the special pellets for PP-R inner tube into the single-s...

Embodiment 2

[0038] Example 2: Prepare a thermal insulation PP-R pipe, the PP-R pipe specification is S3.225*3.5 (white), the thickness of foamed polyethylene is 6 mm, and it is gray.

[0039] The preparation method is as follows:

[0040] (1) Mix the low-density polyethylene and the gray outer layer masterbatch according to the mass-number ratio of 100:1.5, fully stir with a high-speed mixer for 5-10 minutes, and then extrude and granulate through a twin-screw extruder. The processing temperature is controlled at Between 170-200 °C, the outer layer of spare pellets is obtained;

[0041] (2) Mix the PP-R resin and the white inner tube color masterbatch according to the ratio of parts by mass of 100:3, fully stir with a high-speed mixer for 5-10 minutes, and then extrude and granulate through a twin-screw extruder. The processing temperature is controlled at Between 170-220°C, special pellets for PP-R inner tubes can be obtained;

[0042] (3) Then put the special pellets for PP-R inner tu...

Embodiment 3

[0045] Example 3: Prepare a thermal insulation PP-R pipe, the PP-R pipe specification is S2.532*5.4 (white), the thickness of foamed polyethylene is 8 mm, and it is green.

[0046] The preparation method is as follows:

[0047] (1) Mix the low-density polyethylene and the green outer layer masterbatch according to the mass ratio of 100:3, fully stir with a high-speed mixer for 5-10 minutes, and then extrude and granulate through a twin-screw extruder. The processing temperature is controlled at 170 Between -200°C, the spare pellets for the outer layer are obtained;

[0048] (2) Mix PP-R resin and white masterbatch according to the ratio of mass and number of parts 100:2.5, fully stir with a high-speed mixer for 5-10 minutes, and then extrude and granulate through a twin-screw extruder. The processing temperature is controlled at 170-220 Between ℃, special pellets for PP-R inner tubes are obtained;

[0049] (3) Then put special materials for PP-R pipes into the single-screw e...

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Abstract

The invention discloses a heat preservation polypropylene random copolymer (PP-R) pipe, which is divided into two layers which are a PP-R inner pipe and a foam polyethylene outer layer from inside to outside, wherein the PP-R inner pipe and the foam polyethylene outer layer are formed in one step by a coextrusion die. Foam polyethylene is obvious in heat preservation effect and high in impact resistance, so that heat loss can be reduced, and the pipe can be prevented from being impacted and cracked by outer force.

Description

technical field [0001] The invention relates to the technical field of plastic pipes, in particular to a thermal insulation PP-R pipe and a preparation method thereof. Background technique [0002] Random copolymer polypropylene (PP-R) pipe system has many advantages such as light weight, corrosion resistance, no scaling, long service life, convenient installation, reliable connection, etc. Since it was introduced into China, it has been widely used. The Ministry of Construction of my country has made PP-R pipes for hot and cold water the first of the three major new plastic pipes to be promoted. In recent years, with the rapid development of my country's economy, the consumption of PP-R pipes has also increased significantly, the market share has increased rapidly, and the development momentum has been rapid. In the field of cold and hot water transportation, the consumption of PP-R pipes occupies the first place, and the total consumption accounts for about 50% of all pla...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F16L9/12F16L59/02F16L59/04C08L23/06C08L23/12C08J9/04B29C47/92B29C47/06B29C48/04B29C48/92
CPCB29C47/92B29C48/04
Inventor 王军彭晓翊秦小梅李白千
Owner RIFENG ENTERPRISE GRP CO LTD
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