CN111098476A - Production process of high-purity high-density polyethylene plastic barrel - Google Patents
Production process of high-purity high-density polyethylene plastic barrel Download PDFInfo
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- CN111098476A CN111098476A CN201811248787.8A CN201811248787A CN111098476A CN 111098476 A CN111098476 A CN 111098476A CN 201811248787 A CN201811248787 A CN 201811248787A CN 111098476 A CN111098476 A CN 111098476A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
- B29C49/42—Component parts, details or accessories; Auxiliary operations
- B29C49/46—Component parts, details or accessories; Auxiliary operations characterised by using particular environment or blow fluids other than air
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
- B29C49/42—Component parts, details or accessories; Auxiliary operations
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
- B29C49/42—Component parts, details or accessories; Auxiliary operations
- B29C49/46—Component parts, details or accessories; Auxiliary operations characterised by using particular environment or blow fluids other than air
- B29C2049/4602—Blowing fluids
- B29C2049/4605—Blowing fluids containing an inert gas, e.g. helium
- B29C2049/4608—Nitrogen
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- B29K2023/00—Use of polyalkenes or derivatives thereof as moulding material
- B29K2023/04—Polymers of ethylene
- B29K2023/06—PE, i.e. polyethylene
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
- B29L2031/00—Other particular articles
- B29L2031/712—Containers; Packaging elements or accessories, Packages
- B29L2031/7154—Barrels, drums, tuns, vats
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- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
- Blow-Moulding Or Thermoforming Of Plastics Or The Like (AREA)
Abstract
The invention relates to the field of production of high-purity plastic barrels, and provides a production process of a high-purity high-density polyethylene plastic barrel, which comprises the following steps: step S1; conveying high-purity nitrogen as a blowing gas source to blowing equipment; and step S2: adding polyethylene particles from a charging opening of blow molding equipment, and melting and blow molding the polyethylene particles to obtain the high-purity high-density polyethylene plastic barrel. The production process of the high-purity high-density polyethylene plastic barrel uses high-purity nitrogen to replace the traditional compressed air as a gas source, and performs blow molding on the high-purity high-density polyethylene plastic barrel so as to control the number of particles and metal ions in the barrel to meet the use requirement of a semiconductor.
Description
Technical Field
The invention relates to the field of production of high-purity plastic barrels, in particular to a production process of a high-purity high-density polyethylene plastic barrel.
Background
The plastic barrel is mainly used for storing and transporting various liquids, has good characteristics for special dangerous goods packages, has the characteristics of low probability of breakage, no rustiness, light weight and the like, has excellent oil resistance and strong corrosion resistance, is mainly used for packaging dangerous goods needing heat preservation, moisture resistance, pressure resistance and corrosion resistance, and is mainly made of polyethylene, polypropylene, polyester and the like through blow molding, injection molding, plastic sucking and rotational molding. High Density Polyethylene (HDPE) is polymerized at low pressure and is also called low pressure polyethylene. Heat resistance, boiling resistance, cold resistance, freezing resistance, moisture resistance, gas resistance, good insulating property, difficult damage and twice strength of the low density polyethylene.
The conventional production of high density polyethylene usually employs filtration of compressed air for blow molding to control the amount of particles having a particle size of 1 μm or less in the barrel after blow molding, but is very difficult to control for various reasons. In addition, in the traditional production process, the atmosphere is used as a compressed air source for blow molding, and because the fluctuation of particles with various particle sizes in the air is large, for example, PM2.5 is particles with particle sizes of more than 2.5 micrometers, the fluctuation range of the particles is often from dozens to four hundred, and the fluctuation of particles with particle sizes of less than 1 micrometer is larger, the stability of producing high-purity plastic barrels is severely limited by the traditional method for filtering the compressed air for blow molding.
Disclosure of Invention
The invention aims to provide a production process of a high-purity high-density polyethylene plastic barrel, which uses high-purity nitrogen to replace the traditional compressed air as a gas source to blow the high-purity high-density polyethylene plastic barrel so as to control the number of particles and metal ions in the barrel to meet the use requirements of semiconductors.
The technical problem to be solved by the invention is realized by adopting the following technical scheme.
The invention provides a production process of a high-purity high-density polyethylene plastic barrel, which comprises the following steps:
step S1; conveying high-purity nitrogen as a blowing gas source to blowing equipment;
and step S2: adding polyethylene particles from a charging opening of blow molding equipment, and melting and blow molding the polyethylene particles to obtain the high-purity high-density polyethylene plastic barrel.
Preferably, in the step S1, the high purity nitrogen gas is passed through a filter and then sent to a blow molding facility.
Preferably, in the step S1, the filter precision is 0.5 to 0.05 μm.
Preferably, in step S1, the high purity nitrogen gas is sent to the filter through a polishing pipe.
Preferably, in the step S1, the polishing precision of the polished pipe is 200 to 800 meshes.
Preferably, in step S1, the polished pipe is electropolished.
Preferably, in the step S1, the pressure of the high-purity nitrogen is 0.30-0.80 Mpa.
Preferably, in the step S1, the blow-molding temperature of the blow-molding equipment is 180-210 ℃.
Preferably, in the S2 step, the blow molding is performed in a clean room, and the grade of the clean room is ten-thousand.
The production process of the high-purity high-density polyethylene plastic barrel provided by the embodiment of the invention has the beneficial effects that: the production process uses high-purity nitrogen to replace the traditional compressed air as a gas source, and performs blow molding on the high-purity high-density polyethylene plastic barrel, so that the number of particles and metal ions in the plastic barrel is controlled in a lower range, and the requirements of semiconductors are met.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
FIG. 1 is a schematic structural diagram of a production system for high-purity high-density polyethylene plastic barrels according to an embodiment of the invention.
In the figure: 1-a nitrogen storage tank; 2-polishing the pipeline; 3-a filter; 4-a blow molding machine; 5-a purification room; 6-high efficiency filter of purification room; 7-a feed inlet.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below. The examples, in which specific conditions are not specified, were conducted under conventional conditions or conditions recommended by the manufacturer. The reagents or instruments used are not indicated by the manufacturer, and are all conventional products available commercially.
The following is a detailed description of the process for producing the high-purity high-density polyethylene plastic drum according to the embodiment of the present invention.
The invention provides a production process of a high-purity high-density polyethylene plastic barrel, which comprises the following steps:
step S1; conveying high-purity nitrogen as a blowing gas source to blowing equipment; the air is directly used as a compressed air source for blow molding, and particles with various particle sizes in the air greatly fluctuate, especially particles with small particle sizes, so that the particles with the particle size of less than 1 micron in a high-purity high-density polyethylene plastic barrel cannot be controlled, and further most domestic high-purity chemicals depend on foreign high-purity purification packages. With the rapid development of the semiconductor industry, the requirement on high-purity purification packaging is increasingly strict, the metal ions of a chemical product of a 12-inch semiconductor are required to be below 100ppt, the number of 0.2-micron particles is controlled to be below 30/mL, the number of 0.1-micron particles is controlled to be below 100/mL, and the requirement cannot be met by adopting high-purity nitrogen as a gas source to blow the plastic barrel. The invention adopts high-purity nitrogen as a blow molding gas source, and compared with air, the high-purity nitrogen has high purity and few micro particles, and the high-purity high-density polyethylene plastic barrel formed by blow molding has high purity, can be used as a package in the field of high-end chemicals, and can effectively avoid secondary pollution of the high-end chemicals. And high-purity nitrogen is adopted as an air source, the concentration of metal ions in the air source is low, and the concentration of the metal ions in the plastic barrel can be effectively reduced.
Further, the high purity nitrogen gas is sent to the blow molding equipment after passing through a filter. The filter can further filter particles possibly appearing in the high-purity nitrogen gas, so that the blow molding gas source is purer, and the purity of the plastic barrel obtained by blow molding is higher.
Furthermore, the precision of the filter is 0.5-0.05 micron. The particle in the high-purity high-density polyethylene plastic barrel can be effectively controlled by adjusting the precision of the filter. The particle quantity in the plastic bucket can be effectively controlled by adjusting the precision of the filter to be 0.5-0.05 microns, so that the obtained plastic bucket meets the packaging requirement in the field of semiconductors.
Further, high purity nitrogen gas is delivered to the filter through a polished pipe. The wall of polishing pipeline is smooth, and the roughness is low, can prevent effectively that fine particle from attaching to the pipeline surface, further reduces high-purity nitrogen gas and suffers the possibility of granule pollution in the transfer process for the high-purity high density polyethylene plastic drum purity that makes is high, accords with the requirement of semiconductor field to the packing. And, adopt polishing pipeline to carry out the conveying of blowing gas, can effectively reduce the metal ion concentration in the plastic drum.
Further, the polishing precision of the polishing pipeline is 200-800 meshes. Adopt polishing pipeline and ordinary pipeline to compare, polishing pipeline surface is smooth, is difficult to hide the granule, can prevent effectively that the granule from hiding in the hole of pipeline to under the blowing power of air supply, pollute the air supply, finally at the in-process of blow molding, pollute the plastic drum, consequently, use the quantity of the reduction plastic drum interior granule that polishing pipeline can. The polishing precision of 200-800 meshes can effectively ensure that high-purity nitrogen is not polluted and is more convenient to convey.
Further, the polishing pipe employs electrolytic polishing. The electrolytic polishing has high efficiency, and the polished surface can form a compact and firm oxide film without generating a processing deteriorated layer.
Further, the pressure of the high-purity nitrogen is 0.30-0.80 MPa. By adopting the pressure in the range, the concentration of metal ions in the plastic barrel can be effectively reduced.
Further, the blow molding temperature of the blow molding equipment is 180-210 ℃. When the blow molding temperature is lower, because the time that the plastic drum solidifies is short, the plastic drum can solidify fast, and when the plastic drum was polluted by the granule, the granule can be attached on the surface of plastic drum, and when the blow molding temperature was higher, the granule can be in the plastic drum, and the granule can be inside the plastic drum after solidifying, and the granule is all wrapped up by polyethylene all around promptly. Therefore, in the using process, after liquid is put into the plastic barrel, the particles are not easy to enter the liquid to pollute the liquid because the peripheries of the particles are all wrapped by the polyethylene. Therefore, the higher temperature is 180-210 ℃, the temperature is high enough to ensure that the particles are wrapped in the polyethylene, and meanwhile, the temperature is not too high to influence the molding of the plastic barrel.
And step S2: adding polyethylene particles from a charging opening of blow molding equipment, and melting and blow molding the polyethylene particles to obtain the high-purity high-density polyethylene plastic barrel.
Further, the blow molding is carried out in a clean room, and the grade of the clean room is ten thousand to ten. Blow molding is carried out in the purification room, and the possibility of pollution of particles and metal ions to the plastic barrel in the blow molding process can be effectively reduced. The purifying room is an environment with a gas environment filtered, the concentration of particles or metal ions in the surrounding environment is low, and the pollution of the particles and the metal ions to the plastic barrel in the blow molding process can be effectively avoided.
The features and properties of the present invention are described in further detail below with reference to examples.
Example 1
The present embodiment provides a production system of a high-purity high-density polyethylene plastic barrel, which is a structural diagram of the production system of the high-purity high-density polyethylene plastic barrel shown in fig. 1, and comprises a nitrogen storage tank 1, a polishing pipeline 2, a filter 3, a blow molding machine 4, a purification room 5 and a purification room high efficiency filter 6. The blow molding machine 4 is used as blow molding equipment, wherein the nitrogen storage tank 1, the polishing pipeline 2, the filter 3 and the blow molding machine 4 are connected in sequence, and high-purity nitrogen is transmitted to the blow molding machine to be used as a blow molding air source. Meanwhile, the blow molding machine 4 with the charging port 7 is disposed in the purification room 5, and the purification room high efficiency filter 6 is disposed on the purification room 5 for ensuring a clean environment in the purification room 5.
The present embodiment also provides a process for producing a high purity high density polyethylene plastic tub using the above production system for a high purity high density polyethylene plastic tub, comprising transferring high purity nitrogen gas having a pressure of 0.55Mpa in a nitrogen gas storage tank 1 to a filter 3 through a polishing pipe 2. Wherein, the polishing pipeline 2 adopts electrolytic polishing, and the polishing precision is 500 meshes; the filter 3 precision is 0.20 microns. The high purity nitrogen gas filtered by the filter 3 is sent to a blow molding machine 4 as a blow molding gas source. Polyethylene particles are added from a feed inlet 7 of a blow molding machine, and after the polyethylene particles are melted in the blow molding machine to become a casting barrel mixture, the high-purity high-density polyethylene plastic barrel is formed by blow molding at a blow molding temperature of 195 ℃ under the action of high-purity nitrogen. In order to further reduce the pollution of particles and metal ions caused by ambient gas to the high-purity high-density polyethylene plastic barrel in the blow molding process, the concentration of the particles and the metal ions in the high-purity high-density polyethylene plastic barrel is further controlled. The blow moulding machine 4 is prevented in a clean room 5 of the order of thousands. Air enters the purifying room 5 through the purifying room high-efficiency filter 6 to ensure the purifying degree in the purifying room 5.
Example 2
The embodiment provides a production process of a high-purity high-density polyethylene plastic barrel, which comprises the following steps: high purity nitrogen gas at a pressure of 0.80Mpa in the nitrogen gas tank was delivered to the filter through a polished pipe. Wherein the polishing pipeline adopts electrolytic polishing, and the polishing precision is 200 meshes; the filter accuracy was 0.50 microns. The high-purity nitrogen filtered by the filter is transmitted to a blow molding machine to be used as a blow molding air source. Adding polyethylene particles from a feeding port of a blow molding machine, melting the polyethylene particles in the blow molding machine to form a casting barrel mixed material, and blow molding the casting barrel mixed material at a blow molding temperature of 180 ℃ under the action of high-purity nitrogen to form the high-purity high-density polyethylene plastic barrel. In order to further reduce the pollution of particles and metal ions caused by ambient gas to the high-purity high-density polyethylene plastic barrel in the blow molding process, the concentration of the particles and the metal ions in the high-purity high-density polyethylene plastic barrel is further controlled. The blow molding machine is housed in a clean room of the order of ten thousand. The air enters the purifying room through the high-efficiency filter of the purifying room so as to ensure the purifying degree in the purifying room.
Example 3
The embodiment provides a production process of a high-purity high-density polyethylene plastic barrel, which comprises the following steps: high purity nitrogen gas at a pressure of 0.30Mpa in the nitrogen gas tank was delivered to the filter through a polished pipe. Wherein, the polishing pipeline adopts mechanical polishing, and the polishing precision is 800 meshes; the filter precision was 0.05 microns. The high-purity nitrogen filtered by the filter is transmitted to a blow molding machine to be used as a blow molding air source. Adding polyethylene particles from a feeding port of a blow molding machine, melting the polyethylene particles in the blow molding machine to obtain a casting barrel mixed material, and blow molding the casting barrel mixed material at a blow molding temperature of 210 ℃ under the action of high-purity nitrogen to form the high-purity high-density polyethylene plastic barrel. In order to further reduce the pollution of particles and metal ions caused by ambient gas to the high-purity high-density polyethylene plastic barrel in the blow molding process, the concentration of the particles and the metal ions in the high-purity high-density polyethylene plastic barrel is further controlled. The blow molding machine was housed in a clean room rated at ten. The air enters the purifying room through the high-efficiency filter of the purifying room so as to ensure the purifying degree in the purifying room.
Example 4
The embodiment provides a production process of a high-purity high-density polyethylene plastic barrel, which comprises the following steps: high purity nitrogen gas at a pressure of 0.50Mpa in the nitrogen storage tank was delivered to the blow molder through a polished pipe. Wherein, the polishing pipeline adopts electrolytic polishing, and the polishing precision is 500 meshes. Conveying high-purity nitrogen to a blow molding machine through a pipeline to serve as a blow molding air source, adding polyethylene particles from a feeding port of the blow molding machine, melting the polyethylene particles in the blow molding machine to form a blow molding machine, and blow molding the mixed material of the casting barrel at a blow molding temperature of 190 ℃ under the action of the high-purity nitrogen to form the high-purity high-density polyethylene plastic barrel. In order to further reduce the pollution of particles and metal ions caused by ambient gas to the high-purity high-density polyethylene plastic barrel in the blow molding process, the concentration of the particles and the metal ions in the high-purity high-density polyethylene plastic barrel is further controlled. The blow molding machine was housed in a class hundred clean room. The air enters the purifying room through the high-efficiency filter of the purifying room so as to ensure the purifying degree in the purifying room.
Example 5
The embodiment provides a production process of a high-purity high-density polyethylene plastic barrel, which comprises the following steps: high purity nitrogen gas at a pressure of 0.30Mpa in the nitrogen storage tank was transferred to the filter through a pipe. The filter accuracy was 0.50 microns. The high-purity nitrogen filtered by the filter is transmitted to a blow molding machine to be used as a blow molding air source, polyethylene particles are added from a charging opening of the blow molding machine, the polyethylene particles are melted in the blow molding machine to be changed into a casting barrel mixed material, and the casting barrel mixed material is blown at a blow molding temperature of 180 ℃ under the action of the high-purity nitrogen to form the high-purity high-density polyethylene plastic barrel. In order to further reduce the pollution of particles and metal ions caused by ambient gas to the high-purity high-density polyethylene plastic barrel in the blow molding process, the concentration of the particles and the metal ions in the high-purity high-density polyethylene plastic barrel is further controlled. The blow molding machine is housed in a clean room of the order of ten thousand. The air enters the purifying room through the high-efficiency filter of the purifying room so as to ensure the purifying degree in the purifying room.
Example 6
The embodiment provides a production process of a high-purity high-density polyethylene plastic barrel, which comprises the following steps: high purity nitrogen gas at a pressure of 0.80Mpa in the nitrogen storage tank was transferred to the blow molding machine through a pipe. High-purity nitrogen is conveyed to a blow molding machine through a pipeline to be used as a blow molding air source, polyethylene particles are added from a feeding port of the blow molding machine, the polyethylene particles are melted in the blow molding machine to be changed into a casting barrel mixed material, and the casting barrel mixed material is blown at a blow molding temperature of 210 ℃ under the action of the high-purity nitrogen to form the high-purity high-density polyethylene plastic barrel. In order to further reduce the pollution of particles and metal ions caused by ambient gas to the high-purity high-density polyethylene plastic barrel in the blow molding process, the concentration of the particles and the metal ions in the high-purity high-density polyethylene plastic barrel is further controlled. The blow molding machine was housed in a clean room rated at ten. The air enters the purifying room through the high-efficiency filter of the purifying room so as to ensure the purifying degree in the purifying room.
Comparative example
This embodiment provides another production technology of high density polyethylene plastic drum, and it includes: air with a pressure of 0.80Mpa is conveyed in the clean room through a pipeline to the blow molding machine as the blow molding air source. Adding polyethylene particles from a feeding port of a blow molding machine, melting the polyethylene particles in the blow molding machine to obtain a casting barrel mixed material, and blow molding the casting barrel mixed material at a blow molding temperature of 180 ℃ under the action of air to form the high-purity high-density polyethylene plastic barrel.
Test example 1
The particle concentrations of the high-purity high-density polyethylene plastic tanks produced in examples 1 to 6 and the high-density polyethylene plastic tank produced in the comparative example were measured by a microparticle analyzer (Liquid Sampler LS-60, LIGHT THOUSE, USA). The specific operation flow is as follows:
1. pure water was taken in the clean room, and the number of particles A (number/mL) of the pure water was measured as specified in the flow of the apparatus operation.
2. Pure water is poured into a container (namely, the high-purity high-density polyethylene plastic barrels produced in examples 1 to 6 or the high-density polyethylene plastic barrels produced in comparative examples) in a purification room, the volume of the pure water accounts for 1/3 to 1/2 of the container, and the container is fully vibrated.
3. In the clean room, B (pieces/mL) was taken as a particle of pure water in the measurement vessel.
4. Calculating the particle concentration P (pieces/mL) of the container
Calculating the formula: p = (B-A) × V2/V1
In the formula: v1= volume of container (mL); v2= volume of pure water poured into container (mL)
Test example 2
The metal ion contents of the high-purity high-density polyethylene plastic barrels produced in examples 1 to 6 and the high-density polyethylene plastic barrels produced in comparative examples were measured by an inductively coupled plasma mass spectrometer (model 7500cs, Agilent, USA). The specific operation flow is as follows:
1. taking nitric acid from a purification room, and determining the content of metal ions as A according to the related regulation of SJ/T11555-20152（ppb）。
2. In a purification room, nitric acid is poured into a container (namely, the high-purity high-density polyethylene plastic barrel produced in the examples 1-6 or the high-density polyethylene plastic barrel produced in the comparative example), the volume of the nitric acid accounts for 1/3-1/2 of the container, and the container is fully vibrated.
3. Measuring the content of metal ions of nitric acid in the container in a purification room to be B2（ppb）。
4. Calculating the Metal ion content I (ppb) of the vessel
Calculating the formula: i = (B2-A2) × V4/V3
In the formula: v3= volume of container (mL); v4= volume of nitric acid poured into container (mL)
TABLE 1 particle concentration and Metal ion content of Plastic barrels prepared in examples and comparative examples
| Test results | Example 1 | Example 2 | Example 3 | Example 4 | Example 5 | Example 6 | Comparative example |
| Ppb of silver (Ag) | 0.03 | 0.07 | 0.11 | 0.19 | 0.21 | 0.47 | 12 |
| Aluminum (Al) ppb | 0.05 | 0.09 | 0.13 | 0.20 | 0.22 | 0.53 | 15 |
| Arsenic (As) ppb | 0.05 | 0.08 | 0.14 | 0.29 | 0.31 | 0.52 | 8 |
| Boron (B) ppb | 0.40 | 0.62 | 0.62 | 0.78 | 0.81 | 1.21 | 4 |
| Calcium (Ca) ppb | 0.10 | 0.14 | 0.14 | 0.29 | 0.31 | 0.66 | 45 |
| Cadmium (Cd) ppb | 0.05 | 0.09 | 0.13 | 0.28 | 0.28 | 0.56 | 10 |
| Cobalt (Co) ppb | 0.04 | 0.08 | 0.17 | 0.33 | 0.35 | 0.54 | 12 |
| Chromium (Cr) ppb | 0.04 | 0.07 | 0.16 | 0.25 | 0.30 | 0.57 | 11 |
| Copper (Cu) ppb | 0.04 | 0.09 | 0.21 | 0.31 | 0.35 | 0.49 | 13 |
| Gallium (Ga) ppb | 0.03 | 0.06 | 0.11 | 0.14 | 0.15 | 0.22 | 8 |
| Germanium (Ge) ppb | 0.02 | 0.04 | 0.09 | 0.14 | 0.14 | 0.21 | 9 |
| Gold (Au) ppb | 0.01 | 0.02 | 0.04 | 0.07 | 0.07 | 0.10 | 3 |
| Iron (Fe) ppb | 0.10 | 0.13 | 0.19 | 0.31 | 0.35 | 0.53 | 96 |
| Potassium (K) ppb | 0.05 | 0.08 | 0.17 | 0.25 | 0.31 | 0.37 | 88 |
| Lithium (Li) ppb | 0.04 | 0.08 | 0.18 | 0.26 | 0.30 | 0.36 | 13 |
| Magnesium (Mg) ppb | 0.05 | 0.07 | 0.15 | 0.26 | 0.26 | 0.41 | 22 |
| Manganese (Mn) ppb | 0.05 | 0.08 | 0.15 | 0.23 | 0.23 | 0.38 | 11 |
| Sodium (Mn) ppb | 0.10 | 0.13 | 0.19 | 0.32 | 0.39 | 0.61 | 102 |
| Nickel (Ni) ppb | 0.03 | 0.05 | 0.06 | 0.14 | 0.15 | 0.26 | 17 |
| Pb (Pb) ppb | 0.03 | 0.05 | 0.07 | 0.12 | 0.13 | 0.28 | 14 |
| Tin (Sn) ppb | 0.05 | 0.07 | 0.10 | 0.18 | 0.21 | 0.37 | 9 |
| Strontium (Sr) ppb | 0.03 | 0.07 | 0.13 | 0.23 | 0.25 | 0.27 | 3 |
| Vanadium (V) ppb | 0.04 | 0.07 | 0.15 | 0.23 | 0.26 | 0.32 | 7 |
| Zinc (Zn) ppb | 0.02 | 0.03 | 0.06 | 0.08 | 0.09 | 0.14 | 15 |
| The particles are more than or equal to 0.5 mu m/mL | 3 | 6 | 13 | 17 | 16 | 28 | 306 |
| The particles are more than or equal to 0.2 mu m/mL | 18 | 19 | 22 | 23 | 25 | 30 | 3521 |
| The particles are more than or equal to 0.1 mu m/mL | 40 | 52 | 65 | 85 | 90 | 102 | 15392 |
The particle concentration and the metal ion content measured in test example 1 and test example 2 are shown in table 1, and it can be seen from table 1 that the particle concentration and the metal ion content of the high-purity high-density polyethylene plastic barrels produced in examples 1 to 6 are far lower than those of the high-density polyethylene plastic barrels produced in comparative examples, and it can be seen that the particle concentration and the metal ion content can be effectively controlled at lower levels by replacing air with high-purity nitrogen as a gas source for blow molding. Wherein, the particle concentration and the metal ion content of the high-purity high-density polyethylene plastic barrel produced by the method in the embodiment 1 are obviously lower than those of the embodiment 2-6. It is stated that both the particle concentration and the metal ion content can be reduced to some extent, whether by control of the blow-moulding temperature, by the use of polished tubing, or by operation in a clean room.
In summary, in the production process of the high-purity high-density polyethylene plastic barrel according to the embodiment of the invention, high-purity nitrogen gas is used to replace the conventional compressed air as a gas source to blow the high-purity high-density polyethylene plastic barrel, so that the number of particles and metal ions in the plastic barrel is controlled in a lower range, and the semiconductor requirements are met.
The embodiments described above are some, but not all embodiments of the invention. The detailed description of the embodiments of the present invention is not intended to limit the scope of the invention as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Claims (9)
1. A production process of a high-purity high-density polyethylene plastic barrel is characterized by comprising the following steps:
step S1; conveying high-purity nitrogen as a blowing gas source to blowing equipment;
and step S2: and adding polyethylene particles from a feed inlet of the blow molding equipment, and melting and blow molding the polyethylene particles to obtain the high-purity high-density polyethylene plastic barrel.
2. The process for manufacturing a highly pure high density polyethylene plastic tub as claimed in claim 1, wherein in the step of S1, the highly pure nitrogen gas is passed through a filter and then sent to the blow molding equipment.
3. The process for producing a high purity high density polyethylene plastic tub according to claim 2, wherein in the step of S1, the filter accuracy is 0.5 to 0.05 μm.
4. The process for manufacturing a highly pure HDPE plastic tub according to claim 2, wherein in step S1, the highly pure nitrogen gas is delivered to the filter through a polished pipe.
5. The process for producing a high purity high density polyethylene plastic drum according to claim 4, wherein in the step of S1, the polishing precision of the polished pipe is 200-800 mesh.
6. The process for manufacturing a high purity high density polyethylene plastic tub as claimed in claim 5, wherein in the step of S1, the polishing pipe is electropolished.
7. The process for producing high-purity high-density polyethylene plastic barrels of claim 1, wherein in the step of S1, the pressure of the high-purity nitrogen is 0.30 to 0.80 MPa.
8. The process for producing high-purity high-density polyethylene plastic barrels of claim 1, wherein in the step of S1, the blow molding temperature of the blow molding equipment is 180-210 ℃.
9. The process for manufacturing a high purity high density polyethylene plastic tub according to claim 1, wherein in the step of S2, the blow molding is performed in a clean room, and the grade of the clean room is ten thousand to ten.
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