CN111793260A - PE (polyethylene) gas pipe and preparation method thereof - Google Patents
PE (polyethylene) gas pipe and preparation method thereof Download PDFInfo
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- CN111793260A CN111793260A CN201910276194.0A CN201910276194A CN111793260A CN 111793260 A CN111793260 A CN 111793260A CN 201910276194 A CN201910276194 A CN 201910276194A CN 111793260 A CN111793260 A CN 111793260A
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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
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K2201/00—Specific properties of additives
- C08K2201/011—Nanostructured additives
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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
- C08L2205/02—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group
- C08L2205/025—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group containing two or more polymers of the same hierarchy C08L, and differing only in parameters such as density, comonomer content, molecular weight, structure
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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
- C08L2310/00—Masterbatches
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- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Extrusion Moulding Of Plastics Or The Like (AREA)
Abstract
The invention discloses a PE (polyethylene) gas pipe, which comprises 93-96% of PE resin powder, 2-3% of black color master batch, 1-2% of antioxidant, 0.5-1% of brightener, 0.5-1.5% of hindered amine light stabilizer and 1-2% of nano composite material. Also disclosed is a method of preparation, comprising the steps of: batching, batching detection, drying, extrusion, molding, shaping, cooling, code spraying, cutting, recovery and warehousing. The PE gas pipe produced by the invention has the beneficial effects that the PE gas pipe is combined with the ingredients and the production process, the PE gas pipe has the characteristics of prolonged service life, strong corrosion resistance, better toughness and rigidity, better light stability, oxidation resistance, thermal stability and aging resistance, the performance of preventing aging and cracking and the like is enhanced, the production process is reasonable in design, the yield is higher, and the production efficiency is improved.
Description
Technical Field
The invention relates to a PE gas pipe and a preparation method thereof, which are mainly applied to a production process of a polyethylene pipe.
Background
The gas pipe is a special pipeline for conveying combustible gas, is a rubber hose with a metal gas pipe hose instead of a traditional buckle mode, and can overcome the defects that the rubber hose is easy to fall off, age and bite insects and has short service life.
The gas pipe has the characteristics of convenient installation, reliable connection, corrosion resistance, no gas blockage, good flexibility, long service life, capability of being bent at will without deformation, no gas blockage and the like. The surface soft protective layer material has the characteristics of safety, easier cleaning and attractive appearance, and the service life of the stainless steel threaded connection metal hose is 8 years. The PE gas pipe is steadily developing, the PE gas pipe, the PP-R gas pipe and the UPVC gas pipe all occupy a place, wherein the strong development of the PE pipe is most remarkable, and the application field of the PE pipe is very wide.
Disclosure of Invention
The invention aims to provide a PE gas pipe and a preparation method thereof, which improve the production efficiency and the product quality.
The invention is realized by the following technical scheme.
A PE gas pipe comprises the following materials in percentage by mass:
93-96% of PE resin powder, 2-3% of black color master batch, 1-2% of antioxidant, 0.5-1% of brightener, 0.5-1.5% of hindered amine light stabilizer and 1-2% of nano composite material.
Further, the nanocomposite is a clay nanocomposite.
Further, the brightener is polyethylene wax.
Further, the antioxidant is a hindered phenol type antioxidant.
A production method of a PE (polyethylene) gas pipe comprises the following steps:
(1) 93-96% of PE resin powder, 2-3% of black color master batch, 1-2% of antioxidant, 0.5-1% of brightener, 0.5-1.5% of hindered amine light stabilizer and 1-2% of nano composite material are stirred and dried to form PE mixed material, and the PE mixed material is detected to detect whether the PE mixed material is doped with impurities;
(2) drying the PE mixed material, wherein the drying temperature is not more than 80 ℃;
(3) feeding the PE mixed material into an extruder for plasticizing extrusion, and controlling the temperature of the extruder at 190-220 ℃;
(4) feeding the extruded material into a mould for forming;
(5) sending the mixture into a vacuum sizing box for sizing, wherein the water temperature of the vacuum sizing box is controlled to be 25-30 ℃, and the vacuum degree is controlled to be 0.02-0.06 Mpa;
(6) sending the mixture into a spray water tank for cooling;
(7) spraying code identification on the shaped pipe;
(8) carrying out traction cutting on the pipe;
(9) cutting and trimming the cut product;
(10) recycling the cut and trimmed leftover materials, and adding the leftover materials into the next production raw material;
(11) and inspecting, packaging and warehousing the finished product.
Further, the host is turned on with a 5% turn-on rate or 5% throughput, and then the turn-on rate is gradually increased to 40% at the same time.
Further, preheating a machine barrel of the extruder, wherein the preheating of the machine barrel is divided into three stages, the temperature is respectively controlled to be 100-120 ℃, 140-160 ℃ and 140-160 ℃, the temperature is gradually increased, and the time is respectively controlled to be more than 40min, 25-35min and 25-35 min.
Further, preheating a die head of the die, wherein the preheating of the die head is divided into three stages, the temperature is respectively controlled to be 100-120 ℃, 140-160 ℃ and 140-160 ℃, and the temperature is gradually increased, and the time is respectively controlled to be more than 40min, 25-35min and 25-35 min.
Further, the temperature of the die is controlled to be 180-220 ℃.
Further, the water temperature of the spray water tank is controlled to be 15-35 ℃.
The invention has the beneficial effects that:
the produced PE gas pipe combines the ingredients and the production process, has the characteristics of prolonged service life, strong corrosion resistance, better toughness and rigidity, better light stability, oxidation resistance, thermal stability and aging resistance, enhanced aging and cracking prevention and other properties, reasonable design of the production process, higher yield and improved production efficiency.
Detailed Description
The present invention will be described in further detail with reference to examples.
A PE gas pipe comprises the following materials in percentage by mass:
93-96% of PE resin powder, 2-3% of black color master batch, 1-2% of antioxidant, 0.5-1% of brightener, 0.5-1.5% of hindered amine light stabilizer and 1-2% of nano composite material.
Further, the nanocomposite is a clay nanocomposite.
Further, the brightener is polyethylene wax.
Further, the antioxidant is a hindered phenol type antioxidant.
Before production, preparation of raw materials:
selecting raw materials:
a. the supply part is responsible for selecting raw materials and auxiliary materials used for production;
b. the raw material is selected from qualified suppliers according to a production operation plan;
c. selecting raw materials according to the requirements of customers with special requirements;
d. the selection of raw materials needs to comprehensively balance the quantity of stocks and orders;
e. an operator should strictly check the raw materials entering a workshop to ensure that the packaging bag is not damaged and the raw materials have no impurities;
f. checking whether the raw materials are normal at any time in the feeding process, and taking measures to adjust in time when abnormal conditions, such as material moisture, impurities and the like, occur;
g. the residual raw materials after production should be sealed tightly to prevent impurities from entering, and marked. The dried raw materials are placed for a long time and then used after being dried again.
Selection of recycled materials:
the clean recycled material produced when the pipe is produced according to the standard can be mixed into the same new material in a small amount for use. The recycled materials with the same grade as the raw materials or similar performance and components are selected, the proportion of the recycled materials is expressed by weight percent of the main raw materials, and the produced pipe material meets the standard requirement.
The production method of the PE gas pipe comprises the following steps:
(1) 93-96% of PE resin powder, 2-3% of black color master batch, 1-2% of antioxidant, 0.5-1% of brightener, 0.5-1.5% of hindered amine light stabilizer and 1-2% of nano composite material are stirred and dried to form PE mixed material, and the PE mixed material is detected to detect whether the PE mixed material is doped with impurities.
The material loading personnel should get into the raw materials in workshop and carry out strict inspection, ensure that the wrapping bag is not damaged, no impurity in the raw materials to carefully inspect whether the raw materials trade mark on the wrapping bag is unanimous with the appointed raw materials on the technology card, prevent with wrong material.
The feeding personnel should take samples for inspection 1-2 hours before the raw materials are put into use, and the inspection item is the moisture content of the raw materials. Before the inspection result comes out, the batch of raw materials cannot be used in principle, and when the batch of raw materials is used in advance, drying treatment is required.
The raw material package should be complete, and for the damaged package, the damaged package should be qualified again by the quality inspection part and can be put into use after no impurity pollution is ensured, and the damaged gas fuel of package is used as the water pipe raw material after being qualified by inspection.
The recycled materials are clean and are added according to the proportion of the technological requirements strictly.
The inspection work before starting is enhanced, and a feeding worker cleans a hopper, a dryer and a magnetic frame at the hopper of a feeding system before starting, so that the magnetic frame is clean and free of impurities and can be put into use; the hopper of the feeding system and the magnetic frame of the dryer are cleaned once when one pipe specification is changed (namely, each time the dryer is started up); the magnetic frame at the hopper is cleaned for at least four times per shift.
(2) And (3) drying the PE mixed material, wherein the drying temperature is not more than 80 ℃.
And when the inspection result shows that the moisture content exceeds the standard requirement, drying the raw materials. When the water content of the raw material meets the standard requirement, the raw material can be directly put into use without drying treatment.
(3) And (3) feeding the PE mixed material into an extruder for plasticizing extrusion, and controlling the temperature of the extruder at 190-220 ℃.
Preheating a machine barrel of the extruder, wherein the preheating of the machine barrel is divided into three stages, the temperature is respectively controlled to be 100-120 ℃, 140-160 ℃ and 140-160 ℃, the temperature is gradually increased, and the time is respectively controlled to be more than 40min, 25-35min and 25-35 min.
The main machine is started with the 5 percent of opening rate or 5 percent of output, if the color bars need to be co-extruded, the co-extruder is started at a low speed before the main machine is started, the color seasonings are prevented from being pressed into the main material, the color bars are ensured to appear as early as possible, then the opening rate is gradually increased to 40 percent, and the excessive cooling or the sagging of the material blank are prevented. And meanwhile, the change of each parameter in the starting process is closely concerned.
(4) And (3) feeding the extruded material into a mold for molding, wherein the temperature of the mold is controlled to be 180-220 ℃.
Preheating a die head of the die, wherein the preheating of the die head is divided into three stages, the temperature is respectively controlled to be 100-120 ℃, 140-160 ℃ and 140-160 ℃, and the temperature is gradually increased, and the time is respectively controlled to be more than 40min, 25-35min and 25-35 min.
When the die head of the die needs to be replaced, only the die head area and the heating area close to the die head can be heated to the third stage, the rest areas are heated to the second stage, and the die head area is ensured to be fully preheated. After the die change is finished, if the machine is started for production, preheating the die head and the machine barrel according to the specification, setting the temperature to be 160 ℃, and after the temperature of the die opening part is raised to be 160 ℃ and is kept for a certain time, simultaneously heating all the heating areas section by section to the process temperature.
Die head replacement and die gap adjustment
The effect of die gap adjustment on tube wall thickness is also evident. Whether the pipe is a thick-wall pipe or a thin-wall pipe, the adjustment of the die gap is in accordance with the principle that the upper part is larger than the lower part (the pipes below phi 200 can be equal up and down), and when the die head is selected, the standard configuration die head of the pipe with higher specification is preferably selected; the size can be changed within a proper range, and the size is strictly forbidden.
(5) And (3) sending the mixture into a vacuum sizing box for sizing, wherein the water temperature of the vacuum sizing box is controlled to be 25-30 ℃, and the vacuum degree is controlled to be 0.02-0.06 Mpa.
(6) And sending the mixture into a spray water tank for cooling.
The existing common pipe extrusion production method comprises vacuum sizing and spray water cooling. Because the wall thickness of the polyethylene pipe is generally thicker, the cooling and setting speed is slow, and a longer production line is needed. The temperature of the spray cooling water is kept within a certain range, the cooling time and speed can be reduced when the temperature is too high, the time that the molten raw material is at high temperature is prolonged (particularly the inner side of the wall thickness of the pipe), so that the decomposition of additives such as antioxidant in the raw material is increased, the ageing resistance of the pipe is reduced, and the shaping of the pipe is also adversely affected. On the contrary, if the water temperature of the vacuum sizing is too low, the cooling crystallization speed of the outer surface of the molten polyethylene pipe is too high, so that the temperature difference between the inner surface and the outer surface of the pipe is too large, the pipe generates large internal stress after being shaped, and the physical and mechanical properties of the pipe are reduced. In order to ensure the production of stable and qualified pipes, the following steps are carried out:
when the starting-up connector enters the sizing sleeve and the vacuum degree begins to rise, the speed is increased slightly, and after the pipe enters the second vacuum groove, the speed is increased to the set yield of the process card.
After the machine is started, the vacuum degree needs to be adjusted in time, a large amount of data are summarized and embodied in a process card for the production of the standard pipe, and the standard pipe can be used in reference according to actual conditions (including ambient temperature, water temperature and the like) in production. The water temperature of the vacuum sizing box is generally 25-30 ℃, and the water temperature of the spraying groove is generally 15-25 ℃.
And (4) measuring the outer diameter of the pipe in time after the pipe is discharged from the vacuum tank, and adjusting the vacuum degree in time if the pipe is not suitable. Starting the machine until the production is stable and normal, insisting on measuring the outer diameter of the pipe and properly adjusting the vacuum degree until the outer diameter of the pipe is stable and qualified.
The vacuum degree is a main factor influencing the outer diameter of the pipe, no ready data can be used for reference, and only continuous accumulation is relied on. In principle, if the average outer diameter is larger, the degree of vacuum is decreased, and if the average outer diameter is smaller, the degree of vacuum is increased. The specific adjustment amplitude is determined according to the specification of the pipe and the sizing sleeve used.
For the production of pipes with all specifications, record summarizing work should be done, and the main record contents include: vacuum degree, water temperature, outer diameter after vacuum groove, outer diameter of cutting off line and outer diameter when cooling to room temperature.
(7) And (5) carrying out code spraying identification on the shaped pipe.
The permanent mark is sprayed on the pipe, and the content of the permanent mark comprises the following steps: manufacturer name, trademark, TS mark, use PE gas pipe, specification size, SDR (standard definition standard), material grade (PE80, PE100) brand, product batch number, production date and time, execution standard (GB15558.1-2003), production team.
Code spraying control elements:
and A, frequently checking and cleaning the nozzle to prevent blockage.
B notes the dilution concentration.
C, keeping the distance between the nozzle and the pipe to be basically consistent, and preferably enabling the characters to be sprayed to be 6-8 mm.
(8) And (5) carrying out traction cutting on the pipe.
The influence of traction on the wall thickness of the pipe is obvious, and the production of all pipes ensures the stability of traction speed and cannot have a slipping phenomenon. Slipping occurs mainly in the production of thick-walled and thin-walled pipes, for which the only way is to increase the traction pressure. For thin-walled tubes, the main reason for slippage is that the tube is flattened due to excessive pressure, the effective contact area between the caterpillar and the tube is small, and therefore the traction pressure should be adjusted to a proper value during the production of the thin-walled tube. If the pipe is flattened due to excessive pressure, the machine can only be stopped and the traction pipe can be passed through again. In short, when the thin-wall pipe is produced, attention should be paid to the pressure value of the tractor and the change of the pipe, so that the situations of slipping and flattening of the pipe are prevented.
The cutting of the pipe is the last link of the production of the pipe, and the end face of the pipe is ensured to be flat and free of burrs. The overall moving speed of the cutting saw is consistent with the pipe traction speed, and the cutting saw is easy to damage due to too high or too low speed. If the outer diameter of the pipe is smaller than the standard size, the saw blade is most easily damaged during cutting, and a thin sheet or other flexible articles of the pipe are padded between the pipe and the slips during cutting, so that the slips can clamp the pipe; the wall thickness is measured in time after the pipe is off-line, and the wall thickness deviation is improved by adjusting the gap of the sizing sleeve or the neck mold. The principle of adjusting the sizing sleeve is that the sizing sleeve is moved towards the direction of the thickness of the opposite wall; the principle of adjusting the die is as follows: the die is moved in the direction opposite to the thickness of the wall.
(9) Cutting and trimming the cut product;
(10) recycling the cut and trimmed leftover materials, and adding the leftover materials into the next production raw material;
(11) and inspecting, packaging and warehousing the finished product.
The PE gas pipe produced by the production method has the advantages of prolonged service life, strong corrosion resistance, good toughness and rigidity, good light stability, oxidation resistance, thermal stability and aging resistance, enhanced aging cracking prevention performance and the like, reasonable production process design, high yield and improved production efficiency.
The above embodiments are merely illustrative of the technical ideas and features of the present invention, and the purpose thereof is to enable those skilled in the art to understand the contents of the present invention and implement the present invention, and not to limit the protection scope of the present invention. All equivalent changes and modifications made according to the spirit of the present invention should be covered within the protection scope of the present invention.
Claims (11)
1. The PE gas pipe is characterized by comprising the following materials in percentage by mass:
93-96% of PE resin powder, 2-3% of black color master batch, 1-2% of antioxidant, 0.5-1% of brightener, 0.5-1.5% of hindered amine light stabilizer and 1-2% of nano composite material.
2. The PE gas pipe of claim 1, wherein the nanocomposite is a clay nanocomposite.
3. The PE gas pipe according to claim 1, characterized in that the brightener is polyethylene wax.
4. The PE gas pipe according to claim 1, characterized in that the antioxidant is a hindered phenol type antioxidant.
5. A production method for preparing the PE gas pipe material of any of claims 1 to 3, characterized by comprising the steps of:
(1) 93-96% of PE resin powder, 2-3% of black color master batch, 1-2% of antioxidant, 0.5-1% of brightener, 0.5-1.5% of hindered amine light stabilizer and 1-2% of nano composite material are stirred and dried to form PE mixed material, and the PE mixed material is detected to detect whether the PE mixed material is doped with impurities;
(2) drying the PE mixed material, wherein the drying temperature is not more than 80 ℃;
(3) feeding the PE mixed material into an extruder for plasticizing extrusion, and controlling the temperature of the extruder at 190-220 ℃;
(4) feeding the extruded material into a mould for forming;
(5) sending the mixture into a vacuum sizing box for sizing, wherein the water temperature of the vacuum sizing box is controlled to be 25-30 ℃, and the vacuum degree is controlled to be 0.02-0.06 Mpa;
(6) sending the mixture into a spray water tank for cooling;
(7) spraying code identification on the shaped pipe;
(8) carrying out traction cutting on the pipe;
(9) cutting and trimming the cut product;
(10) recycling the cut and trimmed leftover materials, and adding the leftover materials into the next production raw material;
(11) and inspecting, packaging and warehousing the finished product.
6. The method for producing a PE gas pipe according to claim 4, wherein the nanocomposite is a clay nanocomposite.
7. The method as claimed in claim 4, wherein the host is turned on at 5% on-time or 5% output, and then the on-time is gradually increased to 40%.
8. The production method of the PE gas pipe material as claimed in claim 4, wherein the barrel of the extruder is preheated, the preheating of the barrel is divided into three stages, the temperature is controlled to be 100-120 ℃, 140-160 ℃, and gradually increased, and the time is controlled to be more than 40min, 25-35min, and 25-35 min.
9. The production method of the PE gas pipe material as claimed in claim 4, wherein the die head of the die is preheated, the preheating of the die head is divided into three stages, the temperature is respectively controlled at 100-120 ℃, 140-160 ℃ and 140-160 ℃, and the temperature is gradually increased, and the time is respectively controlled at more than 40min, 25-35min and 25-35 min.
10. The production method of the PE gas pipe material as claimed in claim 4, wherein the temperature of the mold is controlled to be 180-220 ℃.
11. The production method of the PE gas pipe material as claimed in claim 4, wherein the temperature of the water in the spray water tank is controlled to be 15-35 ℃.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910276194.0A CN111793260A (en) | 2019-04-08 | 2019-04-08 | PE (polyethylene) gas pipe and preparation method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910276194.0A CN111793260A (en) | 2019-04-08 | 2019-04-08 | PE (polyethylene) gas pipe and preparation method thereof |
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| CN111793260A true CN111793260A (en) | 2020-10-20 |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105128374A (en) * | 2015-08-24 | 2015-12-09 | 江苏洁润管业有限公司 | PE pipe production technology |
| CN107189172A (en) * | 2017-07-14 | 2017-09-22 | 长兴佳能高分子材料有限公司 | A kind of PE tubing production technology |
| CN109206710A (en) * | 2018-08-27 | 2019-01-15 | 四川省海维塑胶有限公司 | A kind of production technology of buried combustion gas PE tubing |
-
2019
- 2019-04-08 CN CN201910276194.0A patent/CN111793260A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105128374A (en) * | 2015-08-24 | 2015-12-09 | 江苏洁润管业有限公司 | PE pipe production technology |
| CN107189172A (en) * | 2017-07-14 | 2017-09-22 | 长兴佳能高分子材料有限公司 | A kind of PE tubing production technology |
| CN109206710A (en) * | 2018-08-27 | 2019-01-15 | 四川省海维塑胶有限公司 | A kind of production technology of buried combustion gas PE tubing |
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