CN104725706B - Polyethylene pipe color marking color strip - Google Patents
Polyethylene pipe color marking color strip Download PDFInfo
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- CN104725706B CN104725706B CN201510151616.3A CN201510151616A CN104725706B CN 104725706 B CN104725706 B CN 104725706B CN 201510151616 A CN201510151616 A CN 201510151616A CN 104725706 B CN104725706 B CN 104725706B
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L23/00—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
- C08L23/02—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers not modified by chemical after-treatment
- C08L23/04—Homopolymers or copolymers of ethene
- C08L23/06—Polyethene
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2201/00—Properties
- C08L2201/08—Stabilised against heat, light or radiation or oxydation
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2203/00—Applications
- C08L2203/18—Applications used for pipes
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/03—Polymer mixtures characterised by other features containing three or more polymers in a blend
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- Chemical Kinetics & Catalysis (AREA)
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- Compositions Of Macromolecular Compounds (AREA)
- Rigid Pipes And Flexible Pipes (AREA)
Abstract
The invention discloses a polyethylene pipe color marking color strip, and belongs to the technical fields of color marking and grade differentiation of polyethylene pipes. The marking color strip comprises the following components in parts by weight: 100 parts of white polyethylene resin, 0.5-1 part of an anti-ultraviolet agent, 50-80 parts of an inorganic pigment, 0.5-2 parts of a plasticizer and 2-5 parts of a dispersing agent. Through reasonably selecting the components of the polyethylene pipe color marking color strip and optimizing the proportions of the components, the polyethylene pipe color marking color strip with good ultraviolet resistance and small melt viscosity is obtained; and the marking color strip can be prevented from fading and ageing for over two years under a perpendicular incidence condition of sunlight.
Description
Technical Field
The invention relates to the technical field of polyethylene pipe color marking and grade distinguishing, in particular to a color marking strip for polyethylene pipes.
Background
Polyethylene (PE) pipes are widely used in the fields of gas transportation, water supply and drainage, etc. because of their advantages of long service life, strong corrosion resistance, good flexibility, light weight, convenient connection, and small frictional resistance. In order to distinguish polyethylene pipes with different grades and different purposes, 6-8 color marking color strips are usually arranged on the surface of the pipe. For example, the marking color bar of the PE 80-grade gas pipe is yellow, the marking color bar of the PE 100-grade gas pipe is orange, the marking color bar of the PE 100-grade water supply pipe is blue, and the marking color bar of the PE 100-grade reclaimed water delivery pipe is green. The marking color bar is formed by extruding a marking color bar raw material on the surface of a polyethylene pipe.
In the process of implementing the invention, the inventor finds that at least the following problems exist in the prior art: the existing polyethylene pipe color marking color strip can fade after being exposed to sunlight for a long time, and the use of the polyethylene pipe is influenced.
Disclosure of Invention
In order to solve the technical problem, the invention provides a color marking color strip for a polyethylene pipe resistant to ultraviolet radiation.
Specifically, the method comprises the following technical scheme:
the color marking color strip for the polyethylene pipe comprises the following components in parts by weight:
100 parts of white polyethylene resin;
50-80 parts of inorganic pigment;
0.5-1 part of an anti-ultraviolet agent;
0.5-2 parts of a plasticizer;
2-5 parts of a dispersing agent.
Preferably, the inorganic pigment is at least one selected from the group consisting of an inorganic orange pigment, an inorganic yellow pigment, and an inorganic blue pigment.
Preferably, the inorganic orange pigment is selected from cadmium orange; the inorganic yellow pigment is selected from at least one of iron oxide yellow, lead chrome yellow, zinc chrome yellow and cadmium yellow; the inorganic blue pigment is at least one selected from iron blue, cobalt blue and ultramarine.
Preferably, the ultraviolet screening agent is at least one selected from the group consisting of polysuccinic acid (4-hydroxy-2, 2,6, 6-tetramethyl-1-piperidineethanol) ester, bis (2,2,6, 6-tetramethyl-4-piperidyl) sebacate, bis (1-octyloxy-2, 2,6, 6-tetramethyl-4-piperidyl) sebacate and 2-hydroxy-4-n-octyloxybenzophenone.
Preferably, the plasticizer is selected from at least one of dicyclohexyl phthalate, di (2-ethylhexyl) phthalate, dioctyl phthalate, dibutyl phthalate, dimethyl phthalate, and diethyl phthalate.
Preferably, the dispersant is selected from at least one of sodium polyacrylate, maleic anhydride-acrylic acid copolymer, and sulfonate.
Preferably, the white polyethylene resin is selected from PE100 resin or PE80 resin.
Preferably, the marking color bar comprises the following components in parts by weight: 100 parts of white polyethylene resin; 50-55 parts of inorganic orange pigment; 0.5-0.8 part of anti-ultraviolet agent; 0.5-0.8 part of plasticizer; 4-5 parts of a dispersing agent.
Preferably, the marking color bar comprises the following components in parts by weight: 100 parts of white polyethylene resin; 62-68 parts of inorganic yellow pigment; 0.5-0.8 part of anti-ultraviolet agent; 0.5-0.8 part of plasticizer; 4-5 parts of a dispersing agent.
Preferably, the marking color bar comprises the following components in parts by weight: 100 parts of white polyethylene resin; 30-35 parts of inorganic blue pigment; 20-25 parts of inorganic yellow pigment; 0.5-0.8 part of anti-ultraviolet agent; 0.5-0.8 part of plasticizer; 4-5 parts of a dispersing agent.
The technical scheme provided by the embodiment of the invention has the beneficial effects that:
1. according to the embodiment of the invention, the components of the polyethylene pipe color marking color strip are reasonably selected, and the proportion of the components is optimized, so that the obtained color marking color strip has good ultraviolet light resistance, and can keep no fading or aging for more than 2 years under the direct sunlight condition.
2. The plasticizer is added into the marking color bar, so that the melt viscosity of the marking color bar is effectively reduced, and the processing and molding of the marking color bar on the surface of the polyethylene pipe are facilitated. Can form uniform and smooth marking color strips on the surface of the polyethylene pipe.
Detailed Description
In order to make the technical solutions and advantages of the present invention clearer, the following describes embodiments of the present invention in further detail.
The embodiment of the invention provides a polyethylene pipe color marking color strip which comprises the following components in parts by weight:
100 parts of white polyethylene resin;
50-80 parts of inorganic pigment;
0.5-1 part of an anti-ultraviolet agent;
0.5-2 parts of a plasticizer;
2-5 parts of a dispersing agent.
In order to distinguish polyethylene pipes of different grades and different purposes, color marking color strips are usually formed on the surface of the polyethylene pipes by means of extrusion. According to the embodiment of the invention, the polyethylene pipe color marking color bar with small melt viscosity and good ultraviolet light resistance is obtained by reasonably selecting the components of the marking color bar and optimizing the proportion of the components. The marking color bar comprises the following components:
white polyethylene resin is a basic material for marking the color bar. The white polyethylene resin is the same as polyethylene resin used for polyethylene pipes. For example, the white polyethylene resin used for marking the marking color bar of the PE 100-grade polyethylene pipe should be PE 100-grade polyethylene pipe raw material resin; the white polyethylene resin used for marking the marking color strips of the PE80 grade polyethylene pipe is PE80 grade polyethylene pipe raw material resin; the white polyethylene resin used for marking the marking color bar of the PE63 grade polyethylene pipe should be PE63 grade polyethylene pipe raw material resin.
Inorganic pigment: the corresponding color is provided for the marking color bar. The inorganic pigment is selected because of its good high temperature resistance. The basic material of the marking color bar, namely white polyethylene resin, needs to be melted in the molding process, the melting point of the polyethylene resin is high, and if organic pigment is adopted, the organic pigment can be decomposed in the molding process of the marking color bar, so that the property of the finally formed marking color bar is influenced.
The anti-ultraviolet agent mainly plays a role in absorbing ultraviolet rays and preventing the color strips of the marks from fading and aging.
The plasticizer can reduce the melt viscosity of the marking color bar, improve the flow property and facilitate the molding of the marking color bar. Because the fluidity is good, when the marking color bar is extruded to the surface of the polyethylene pipe after being melted, the melt of the marking color bar can not be adhered with the die, and the finally formed marking color bar is smooth and uniform. In addition, because the melt flow property of the marking color bar is good, the marking color bar raw material remained in the extruder is easy to clean, and the molding of the marking color bar with other colors is not influenced.
The dispersing agent improves the dispersion degree of the inorganic pigment, so that the inorganic pigment is uniformly dispersed in the marking color bar, and the color of the finally formed marking color bar is uniform.
In the above-mentioned marking color bars, since the currently commonly used marking color bars are mainly a yellow marking color bar for marking a PE 80-grade gas pipe material, an orange marking color bar for marking a PE 100-grade gas pipe material, a blue marking color bar for marking a PE 100-grade water supply pipe material, and a green marking color bar for marking a PE 100-grade reclaimed water supply pipe material, the inorganic pigment is preferably at least one of an inorganic orange pigment, an inorganic yellow pigment, and an inorganic blue pigment, wherein the inorganic yellow pigment and the inorganic blue pigment are mixed to form green.
In the above-mentioned marking color bar, the specific kinds of the inorganic orange pigment, the inorganic yellow pigment and the inorganic blue pigment are not strictly limited, and those skilled in the art can select them according to the actual situation. However, in order to make the color of the obtained marking color bar more uniform and stable, the inorganic pigment should be selected to have good compatibility with the white polyethylene resin. For example, the inorganic orange pigment may be cadmium orange, the inorganic yellow pigment is at least one selected from iron oxide yellow, lead chrome yellow, zinc chrome yellow and cadmium yellow, and the inorganic blue pigment is at least one selected from iron blue, cobalt blue and ultramarine blue. In order to increase the bonding strength between the inorganic pigment and the white polyethylene resin, the inorganic pigment is modified before use. The modification can be carried out by a modification method which is conventional in the art, for example, maleic anhydride can be melted and then the inorganic pigment can be added into the maleic anhydride for soaking to obtain the maleic anhydride modified inorganic pigment.
In the above-mentioned marking color bar, the specific type of the ultraviolet inhibitor is not particularly limited, and any ultraviolet inhibitor commonly used in the art may be selected. For example, poly (4-hydroxy-2, 2,6, 6-tetramethyl-1-piperidineethanol) succinate, bis (2,2,6, 6-tetramethyl-4-piperidyl) sebacate, bis (1-octyloxy-2, 2,6, 6-tetramethyl-4-piperidyl) sebacate, 2-hydroxy-4-n-octyloxy benzophenone, UV944 and the like may be used, and each ultraviolet screening agent may be used alone or in combination of a plurality of them.
In the above-mentioned marking color bar, the specific type of the plasticizer is not strictly limited, and the plasticizer commonly used in the art may be selected, for example, dicyclohexyl phthalate (DCHP), di (2-ethylhexyl) phthalate (DEHP), dioctyl phthalate (DOP), dibutyl phthalate (DBP), dimethyl phthalate (DMP), or diethyl phthalate (DEP), and each plasticizer may be used alone or in combination of a plurality of plasticizers.
In the above-mentioned marking color bar, the specific type of the dispersant is also not particularly required, and can be selected by those skilled in the art according to the general knowledge in the art. May be an organic dispersant. Inorganic dispersants may also be used. However, from the viewpoint of compatibility with polyethylene, organic dispersants are preferable, and for example, sodium polyacrylate, maleic anhydride-acrylic acid copolymer, modified sulfonate, and the like can be selected.
In the above-mentioned marking color bar, the polyethylene pipes to be marked at present are mainly PE100 grade polyethylene pipes and PE80 grade polyethylene pipes, so the white polyethylene resin, which is the base material of the marking color bar, is PE100 resin (i.e. raw material resin for processing PE100 grade polyethylene pipes) or PE80 resin (i.e. raw material resin for processing PE80 grade polyethylene pipes).
The orange marking color strip for marking the PE100 grade gas pipe is prepared from the following components in parts by weight:
100 parts of white polyethylene resin;
50-55 parts of inorganic orange pigment;
0.5-0.8 part of anti-ultraviolet agent;
0.5-0.8 part of plasticizer;
4-5 parts of a dispersing agent.
The following is a preferred composition ratio of the yellow marking color strip for marking the PE80 grade fuel gas pipe, and the components in parts by weight are as follows:
100 parts of white polyethylene resin;
62-68 parts of inorganic yellow pigment;
0.5-0.8 part of anti-ultraviolet agent;
0.5-0.8 part of plasticizer;
4-5 parts of a dispersing agent.
The preferable composition ratio of the green marking color strip for marking the PE 100-grade reclaimed water conveying pipe is as follows, and the components in parts by weight are as follows:
100 parts of white polyethylene resin;
30-35 parts of inorganic blue pigment;
20-25 parts of inorganic yellow pigment;
0.5-0.8 part of anti-ultraviolet agent;
0.5-0.8 part of plasticizer;
4-5 parts of a dispersing agent.
The chemicals used in the following examples and comparative examples are as follows:
PE100 polyethylene pipe raw material resin: oleanolic DGGB 2480H;
raw material resin of PE80 grade polyethylene pipe: qilu petrochemical DGGB 2480;
inorganic orange pigment, Sicotan yellow K2001FG, an inorganic pigment of Basff (Ciba) Germany, available from Kyon chemical Co., Ltd;
an inorganic yellow pigment, langsheng bayer le iron oxide yellow 3920, available from shanghai kelin chemical ltd;
inorganic blue pigment, cobalt blue p.b.28, available from massecuite technologies ltd, hannan;
an anti-ultraviolet agent, poly (4-hydroxy-2, 2,6, 6-tetramethyl-1-piperidineethanol) succinate (hereinafter referred to as UV770), available from Nanjing Milan chemical Co., Ltd;
dicyclohexyl phthalate, type: OD-9201, purchased from Shenyang chemical engineering Limited, Shenzhen;
sodium polyacrylate, model 9003-04-7, available from Tianjin Centai chemical Co., Ltd.
The inorganic pigments referred to in the following examples and comparative examples were soaked with maleic anhydride for 12 hours before use. The parts by weight of the inorganic pigments in the following examples are the dry weight of the inorganic pigments.
In the following examples and comparative examples, the marked color bars were extruded onto the surface of polyethylene pipe according to the following process parameters: temperature: 200 ℃, pressure: 180bar, screw speed: 50 to 70 rpm. And then placing the polyethylene pipe outdoors, and testing the ultraviolet light aging resistance of the marked color bar under the direct sunlight condition.
Example 1
The embodiment provides an orange marking color strip for marking a PE100 grade fuel gas pipe, which comprises the following components in parts by weight:
100 parts of white PE100 resin;
0.5 part of an anti-ultraviolet agent UV 770;
50 parts of inorganic orange pigment;
0.5 part of dicyclohexyl phthalate;
5 parts of sodium polyacrylate.
The RGB values of the marking color bar in this embodiment are: 255, 172, 19; the melt mass flow rate of the marking color bar was 0.46g/10min (190 ℃, 5 Kg); the color of the marking color bar remained unchanged for 2 years under direct sunlight conditions.
Comparative example 1
The orange marking color strip for marking PE100 grade fuel gas pipes comprises the following components in parts by weight:
100 parts of white PE100 resin;
1 part of an anti-ultraviolet agent UV 770;
60 parts of inorganic orange pigment;
1.5 parts of dicyclohexyl phthalate;
2 parts of sodium polyacrylate.
The RGB values of the marking color bars of this comparative example are: 255, 114, 0; the marking color bar had a melt mass flow rate of 0.62g/10min (190 ℃, 5kg) and the color of the marking color bar remained unchanged for 1 year under direct sunlight conditions.
Example 2
The embodiment provides a yellow marking color strip for marking a PE80 grade fuel gas pipe, which comprises the following components in parts by weight:
100 parts of white PE80 resin;
0.5 part of an anti-ultraviolet agent UV 770;
65 parts of inorganic yellow pigment;
0.8 part of dicyclohexyl phthalate;
4 parts of sodium polyacrylate.
The RGB values of the marking color bar in this embodiment are: 255, 255, 24; the melt mass flow rate of the marking color bar is 1.02g/10min (190 ℃, 5kg), the marking color bar is placed outdoors, and the color of the marking color bar is kept unchanged for 2 years under the condition of direct sunlight.
Comparative example 2
The yellow marking color strip for marking PE80 grade fuel gas pipes comprises the following components in parts by weight:
100 parts of white PE80 resin;
1 part of an anti-ultraviolet agent UV 770;
60 parts of inorganic yellow pigment;
1.5 parts of dicyclohexyl phthalate;
2 parts of sodium polyacrylate.
The RGB values of the marking color bars of this comparative example are: 255, 204, 0; the melt mass flow rate of the marking color bar is 0.94g/10min, the marking color bar is placed outdoors, and the color of the marking color bar is kept unchanged for 1 year under the condition of direct sunlight.
Example 3
The embodiment provides a green marking color strip for marking a PE 100-grade reclaimed water conveying pipe, which comprises the following components in parts by weight:
100 parts of white PE100 resin;
0.5 part of an anti-ultraviolet agent UV 770;
30 parts of inorganic blue pigment;
20 parts of inorganic yellow pigment;
0.5 part of dicyclohexyl phthalate;
5 parts of sodium polyacrylate.
The RGB values of the marking color bar in this embodiment are: 16, 255, 32; the melt mass flow rate of the marking color bar is 0.45g/10min (190 ℃, 5kg), the marking color bar is placed outdoors, and the color of the marking color bar is kept unchanged for 2 years under the condition of direct sunlight.
Comparative example 3
The green marking color strip for marking the PE 100-grade reclaimed water conveying pipe comprises the following components in parts by weight:
100 parts of white PE100 resin;
1 part of an anti-ultraviolet agent UV 770;
20 parts of inorganic blue pigment;
20 parts of inorganic yellow pigment;
1 part of dicyclohexyl phthalate;
1 part of sodium polyacrylate.
The RGB values of the marking color bars of this comparative example are: 0, 255, 105; the melt mass flow rate of the marking color bar is 0.5g/10min (190 ℃, 5kg), the marking color bar is placed outdoors, and the color of the marking color bar is kept unchanged for 1 year under the condition of direct sunlight.
Comparative example 4
This comparative example compares the properties of the marking color bars of examples 1-3 with the properties of existing marking color bars.
The existing marking color bars are:
orange label bar: nordic chemical HE 3498-LS;
yellow marking bar: northern Europe chemical ME 3446;
blue marker bar: dadall XS 10H.
The main properties of the marking color bars of examples 1 to 3 and the conventional marking color bars are shown in table 1.
TABLE 1 comparison of the properties of the marking color bars of examples 1-3 with existing marking color bars
| Time to failure to fade under direct sunlight conditions | |
| Example 1 | 2 years old |
| Example 2 | 2 years old |
| Example 3 | 2 years old |
| Existing orange marking color bar | 1 year |
| Existing yellow marking color bar | 1 year |
| Existing blue marking color bar | 1 year |
In summary, the polyethylene pipe color marking color strip with good ultraviolet light resistance and low melt viscosity is obtained by reasonably selecting the components of the polyethylene pipe color marking color strip and optimizing the proportion of the components. The marking color bar can keep no fading and aging for more than 2 years under the direct sunlight condition.
The above description is only for facilitating the understanding of the technical solutions of the present invention by those skilled in the art, and is not intended to limit the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (6)
1. The polyethylene pipe color marking color bar is characterized by comprising the following components in parts by weight:
100 parts of white polyethylene resin;
50-55 parts of inorganic orange pigment;
0.5-0.8 part of anti-ultraviolet agent;
0.5-0.8 part of plasticizer;
4-5 parts of a dispersing agent;
or,
100 parts of white polyethylene resin;
62-68 parts of inorganic yellow pigment;
0.5-0.8 part of anti-ultraviolet agent;
0.5-0.8 part of plasticizer;
4-5 parts of a dispersing agent;
or,
100 parts of white polyethylene resin;
30-35 parts of inorganic blue pigment;
20-25 parts of inorganic yellow pigment;
0.5-0.8 part of anti-ultraviolet agent;
0.5-0.8 part of plasticizer;
4-5 parts of a dispersing agent.
2. The marking color bar of claim 1,
the inorganic orange pigment is selected from cadmium orange;
the inorganic yellow pigment is selected from at least one of iron oxide yellow, lead chrome yellow, zinc chrome yellow and cadmium yellow;
the inorganic blue pigment is at least one selected from iron blue, cobalt blue and ultramarine.
3. The marking color bar according to claim 1, wherein the anti-uv agent is at least one selected from the group consisting of polysuccinic acid (4-hydroxy-2, 2,6, 6-tetramethyl-1-piperidineethanol) ester, bis (2,2,6, 6-tetramethyl-4-piperidyl) sebacate, bis (1-octyloxy-2, 2,6, 6-tetramethyl-4-piperidyl) sebacate, and 2-hydroxy-4-n-octyloxybenzophenone.
4. The marking color bar according to claim 1, wherein said plasticizer is selected from at least one of dicyclohexyl phthalate, di (2-ethylhexyl) phthalate, dioctyl phthalate, dibutyl phthalate, dimethyl phthalate, and diethyl phthalate.
5. The marking color bar of claim 1, wherein the dispersant is selected from at least one of sodium polyacrylate, maleic anhydride-acrylic acid copolymer, and sulfonate.
6. The marking color bar of claim 1, wherein the white polyethylene resin is selected from the group consisting of PE100 resin and PE80 resin.
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| CN201510151616.3A CN104725706B (en) | 2015-04-01 | 2015-04-01 | Polyethylene pipe color marking color strip |
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| CN201510151616.3A CN104725706B (en) | 2015-04-01 | 2015-04-01 | Polyethylene pipe color marking color strip |
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| CN104725706B true CN104725706B (en) | 2017-03-22 |
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| CN106084137A (en) * | 2016-07-07 | 2016-11-09 | 开源塑业科技（南通）有限公司 | A kind of plastic pipe is with multi-functional graticule materials |
| CN114716891A (en) * | 2022-04-12 | 2022-07-08 | 梁燕 | Antibacterial powder, antibacterial tube and manufacturing method thereof |
| CN114973920A (en) * | 2022-05-09 | 2022-08-30 | 江苏德新管道科技有限公司 | Steel pipe marking method |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101318422A (en) * | 2007-06-08 | 2008-12-10 | 焦作市卓立烫印材料有限公司 | Plastic pipe marking belt |
| EP2053084A1 (en) * | 2007-10-25 | 2009-04-29 | Total Petrochemicals Research Feluy | Coloured pipes for transporting disinfectant-containing water. |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104151676A (en) * | 2014-08-28 | 2014-11-19 | 山东鲁燕色母粒有限公司 | Preparation method of polyethylene water supply pipe blue identification specially-use material |
| CN104175416A (en) * | 2014-08-28 | 2014-12-03 | 山东鲁燕色母粒有限公司 | Preparation method of special material for polyethylene 80-level yellow gas pipe identification line |
| CN104151677A (en) * | 2014-08-28 | 2014-11-19 | 山东鲁燕色母粒有限公司 | Preparation method of polyethylene 100 grade orange gas pipe identification line specially-use material |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101318422A (en) * | 2007-06-08 | 2008-12-10 | 焦作市卓立烫印材料有限公司 | Plastic pipe marking belt |
| EP2053084A1 (en) * | 2007-10-25 | 2009-04-29 | Total Petrochemicals Research Feluy | Coloured pipes for transporting disinfectant-containing water. |
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