CN113831626A - Preparation method of polyethylene reinforced modified plastic particles - Google Patents
Preparation method of polyethylene reinforced modified plastic particles Download PDFInfo
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- CN113831626A CN113831626A CN202111179671.5A CN202111179671A CN113831626A CN 113831626 A CN113831626 A CN 113831626A CN 202111179671 A CN202111179671 A CN 202111179671A CN 113831626 A CN113831626 A CN 113831626A
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- -1 polyethylene Polymers 0.000 title claims abstract description 64
- 239000004698 Polyethylene Substances 0.000 title claims abstract description 56
- 229920000573 polyethylene Polymers 0.000 title claims abstract description 56
- 229920003023 plastic Polymers 0.000 title claims abstract description 30
- 239000004033 plastic Substances 0.000 title claims abstract description 30
- 239000002245 particle Substances 0.000 title claims abstract description 24
- 238000002360 preparation method Methods 0.000 title claims abstract description 16
- 239000000843 powder Substances 0.000 claims abstract description 62
- 238000004898 kneading Methods 0.000 claims abstract description 46
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 31
- 239000010439 graphite Substances 0.000 claims abstract description 26
- 229910002804 graphite Inorganic materials 0.000 claims abstract description 26
- 239000010445 mica Substances 0.000 claims abstract description 26
- 229910052618 mica group Inorganic materials 0.000 claims abstract description 26
- 239000002002 slurry Substances 0.000 claims abstract description 26
- 239000011575 calcium Substances 0.000 claims abstract description 21
- 229910052791 calcium Inorganic materials 0.000 claims abstract description 21
- CJZGTCYPCWQAJB-UHFFFAOYSA-L calcium stearate Chemical compound [Ca+2].CCCCCCCCCCCCCCCCCC([O-])=O.CCCCCCCCCCCCCCCCCC([O-])=O CJZGTCYPCWQAJB-UHFFFAOYSA-L 0.000 claims abstract description 20
- 238000002156 mixing Methods 0.000 claims abstract description 19
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 claims abstract description 16
- 239000002699 waste material Substances 0.000 claims abstract description 16
- 239000008116 calcium stearate Substances 0.000 claims abstract description 14
- 239000000463 material Substances 0.000 claims abstract description 13
- 238000010438 heat treatment Methods 0.000 claims abstract description 11
- 235000013539 calcium stearate Nutrition 0.000 claims abstract description 9
- 239000002994 raw material Substances 0.000 claims abstract description 7
- XNGIFLGASWRNHJ-UHFFFAOYSA-N phthalic acid Chemical class OC(=O)C1=CC=CC=C1C(O)=O XNGIFLGASWRNHJ-UHFFFAOYSA-N 0.000 claims abstract description 5
- 238000000227 grinding Methods 0.000 claims description 20
- 238000001816 cooling Methods 0.000 claims description 19
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 15
- 238000000034 method Methods 0.000 claims description 15
- 239000000654 additive Substances 0.000 claims description 10
- 230000000996 additive effect Effects 0.000 claims description 10
- 239000012530 fluid Substances 0.000 claims description 10
- 238000001914 filtration Methods 0.000 claims description 7
- 239000000203 mixture Substances 0.000 claims description 7
- 238000005469 granulation Methods 0.000 claims description 5
- 230000003179 granulation Effects 0.000 claims description 5
- 239000008188 pellet Substances 0.000 claims description 5
- 238000005406 washing Methods 0.000 claims description 5
- BJQHLKABXJIVAM-UHFFFAOYSA-N bis(2-ethylhexyl) phthalate Chemical compound CCCCC(CC)COC(=O)C1=CC=CC=C1C(=O)OCC(CC)CCCC BJQHLKABXJIVAM-UHFFFAOYSA-N 0.000 claims description 4
- 238000007599 discharging Methods 0.000 claims description 4
- 239000013590 bulk material Substances 0.000 claims description 3
- 238000001125 extrusion Methods 0.000 claims description 2
- 230000001050 lubricating effect Effects 0.000 abstract description 2
- 238000002844 melting Methods 0.000 abstract description 2
- 230000008018 melting Effects 0.000 abstract description 2
- 230000000052 comparative effect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- RNFJDJUURJAICM-UHFFFAOYSA-N 2,2,4,4,6,6-hexaphenoxy-1,3,5-triaza-2$l^{5},4$l^{5},6$l^{5}-triphosphacyclohexa-1,3,5-triene Chemical compound N=1P(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP=1(OC=1C=CC=CC=1)OC1=CC=CC=C1 RNFJDJUURJAICM-UHFFFAOYSA-N 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 229920006351 engineering plastic Polymers 0.000 description 1
- 238000011049 filling Methods 0.000 description 1
- 239000003063 flame retardant Substances 0.000 description 1
- 229920001903 high density polyethylene Polymers 0.000 description 1
- 239000004700 high-density polyethylene Substances 0.000 description 1
- 229920001684 low density polyethylene Polymers 0.000 description 1
- 239000004702 low-density polyethylene Substances 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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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
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/02—Elements
- C08K3/04—Carbon
-
- 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
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/34—Silicon-containing compounds
-
- 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
- C08K5/00—Use of organic ingredients
- C08K5/04—Oxygen-containing compounds
- C08K5/09—Carboxylic acids; Metal salts thereof; Anhydrides thereof
- C08K5/098—Metal salts of carboxylic acids
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2201/00—Properties
- C08L2201/02—Flame or fire retardant/resistant
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- Chemical & Material Sciences (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Processes Of Treating Macromolecular Substances (AREA)
- Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
Abstract
The invention discloses a preparation method of polyethylene reinforced modified plastic particles, which comprises the following raw materials in parts by weight: 45-55 parts of polyethylene waste, 3-5 parts of phthalate compounds, 5-7 parts of calcium powder, 5-10 parts of mica powder, 1-2 parts of calcium stearate powder and 2-3 parts of graphite; the graphite is not easy to burn, has better flame retardance and friction resistance, can play a role in lubricating during material mixing, is light in weight, reduces the weight of a manufactured product, and is convenient to transport and use; the calcium stearate is prepared into slurry, so that the step of heating and melting the calcium stearate is omitted, the processing steps are reduced, and the working efficiency is improved; the graphite slurry is finally put into a high-speed kneader for kneading, because the graphite has better lubricity, the graphite can be prevented from influencing the full mixing of other slurries; the plastic particles made by mixing graphite have strong flame retardance and can also reduce the quality of products.
Description
Technical Field
The invention belongs to the technical field of manufacturing of modified plastic particles, and particularly relates to a preparation method of polyethylene reinforced modified plastic particles.
Background
Polyethylene is milky white, semitransparent and waxy when not colored, feels greasy when touched by hands, is soft and tough, can be slightly elongated, is soft in low-density polyethylene and good in transparency, is hard in high-density polyethylene, is mainly used for mulching films, hand bags, water pipes, oil drums and the like, is modified plastic, and is processed by filling, blending, reinforcing and other methods on the basis of general plastic and engineering plastic, so that the performances of the fields of flame retardance, strength, impact resistance, toughness and the like are improved.
Polyethylene plastics are generally used in daily life, and as common articles in life, safety guarantee is particularly important, and as is well known, the polyethylene plastics used in life are very easy to ignite, so that great fire safety hidden dangers are brought.
Disclosure of Invention
The invention aims to provide a preparation method of polyethylene reinforced modified plastic particles in order to solve the problems that the traditional polyethylene plastic is flammable and is easy to cause fire and the like.
The invention realizes the purpose through the following technical scheme: the invention provides a preparation method of polyethylene reinforced modified plastic particles, which comprises the following raw materials in parts by weight: 45-55 parts of polyethylene waste, 3-5 parts of phthalate compounds, 5-7 parts of calcium powder, 5-10 parts of mica powder, 1-2 parts of calcium stearate powder and 2-3 parts of graphite;
the preparation method comprises the following specific steps:
step 1: washing the polyethylene waste by using a sodium hydroxide solution, and respectively crushing the polyethylene waste, graphite and mica powder into powder by using a crusher;
step 2: filtering polyethylene powder, calcium powder, mica powder, calcium stearate powder and graphite powder by using a filter screen, wherein the filter screen is 40-60 meshes;
and step 3: grinding the filtered additive calcium powder, mica powder, calcium stearate and graphite powder by a three-roll grinder respectively to obtain corresponding slurry, adding phthalate ester compounds as grinding fluid during grinding, wherein the weight ratio of the additive to the grinding fluid is 1:2, and the fineness of the slurry is 60-80 μm;
and 4, step 4: and (3) putting the filtered polyethylene powder and the ground slurry in the step (3) into a high-speed kneader in sequence for kneading to obtain a mixed material, wherein the feeding sequence is polyethylene powder-calcium stearate slurry-mica powder slurry-calcium powder slurry-graphite slurry, the feeding interval time is 3-5min, and the kneading time is 20-25 min.
And 5: placing the kneaded mixture obtained in the step 4 into an internal mixer for internal mixing to obtain a bulk material, wherein the internal mixing time is 8-10min, the internal mixing temperature is 80-100 ℃, and the temperature of the discharged material is 140-;
step 6: and (5) putting the pellets obtained in the step (5) into an extruder for granulation to obtain the modified polyethylene plastic particles.
Furthermore, the phthalate ester compound is di (2-ethylhexyl) phthalate, so that the production cost can be reduced.
Furthermore, when the filter screen is used for filtering in the step 2, the filter screen is covered by a cover cap, so that the raw materials are prevented from being splashed and wasted, and the environment can be protected.
Further, in the step 4, the kneading time of heating kneading is 10-15min, the discharging temperature is 95-100 ℃, cooling kneading is carried out immediately after heating kneading is finished, the cooling kneading time is 5-10min, and the discharging temperature is below 50 ℃, so that the quality of plastics can be ensured, and the mixed material can be prevented from discoloring, agglomerating and even decomposing.
Furthermore, the internal mixer in the step 5 is 50L, so that the internal mixing efficiency is improved, and the time is saved.
Further, the granulator in the step 6 is a double-screw extruder, the extrusion temperature is 140-.
Has the advantages that:
1. the graphite is not easy to burn, has better flame retardance and friction resistance, can play a role in lubricating during material mixing, is light in weight, reduces the weight of a manufactured product, and is convenient to transport and use;
2. the calcium stearate is prepared into slurry, so that the step of heating and melting the calcium stearate is omitted, the processing steps are reduced, and the working efficiency is improved;
3. the graphite slurry is finally put into a high-speed kneader for kneading, because the graphite has better lubricity, the graphite can be prevented from influencing the full mixing of other slurries;
4. the plastic particles made by mixing graphite have strong flame retardance and can also reduce the quality of products.
Drawings
FIG. 1 is a process flow diagram of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. 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.
In the description of the present invention, it is to be understood that the terms "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention.
Example 1:
a preparation method of polyethylene reinforced modified plastic particles comprises the following raw materials in parts by weight: 45 parts of polyethylene waste, 3 parts of phthalate compounds, 5 parts of calcium powder, 5 parts of mica powder, 1 part of calcium stearate powder and 2 parts of graphite;
as shown in fig. 1, the preparation method comprises the following specific steps:
step 1: washing the polyethylene waste by using a sodium hydroxide solution, and respectively crushing the polyethylene waste, graphite and mica powder into powder by using a crusher;
step 2: filtering polyethylene powder, calcium powder, mica powder, calcium stearate powder and graphite powder by using a filter screen, wherein the filter screen is 40 meshes;
and step 3: grinding the filtered additive calcium powder, mica powder, calcium stearate and graphite powder by a three-roll grinder respectively to obtain corresponding slurry, adding phthalate ester compounds as grinding fluid during grinding, wherein the weight ratio of the additive to the grinding fluid is 1:2, and the fineness of the slurry is 60 mu m;
and 4, step 4: and (3) putting the filtered polyethylene powder and the ground slurry in the step (3) into a high-speed kneading machine in sequence for kneading to obtain a mixed material, wherein the feeding sequence is polyethylene powder-calcium stearate slurry-mica powder slurry-calcium powder slurry-graphite slurry, the feeding interval time is 3min, and the kneading time is 20 min.
And 5: banburying the kneaded mixture obtained in the step 4 in a banbury mixer to obtain a bulk material, wherein the banburying time is 8min, the banburying temperature is 80 ℃, and the temperature of the discharged material is 140 ℃;
step 6: and (5) putting the pellets obtained in the step (5) into an extruder for granulation to obtain the modified polyethylene plastic particles.
The method comprises the following steps of (1) heating, kneading, mixing, heating, kneading, cooling, kneading, extruding, cooling, kneading, cooling, kneading, cooling, kneading, cooling, kneading, cooling.
Example 2:
a preparation method of polyethylene reinforced modified plastic particles comprises the following raw materials in parts by weight: 50 parts of polyethylene waste, 4 parts of phthalate compound, 6 parts of calcium powder, 7 parts of mica powder, 1.5 parts of calcium stearate powder and 2.5 parts of graphite;
as shown in fig. 1, the preparation method comprises the following specific steps:
step 1: washing the polyethylene waste by using a sodium hydroxide solution, and respectively crushing the polyethylene waste, graphite and mica powder into powder by using a crusher;
step 2: filtering polyethylene powder, calcium powder, mica powder, calcium stearate powder and graphite powder by using a filter screen, wherein the filter screen is 50 meshes;
and step 3: grinding the filtered additive calcium powder, mica powder, calcium stearate and graphite powder by a three-roll grinder respectively to obtain corresponding slurry, adding a phthalate compound as grinding fluid during grinding, wherein the weight ratio of the additive to the grinding fluid is 1:2, and the fineness of the slurry is 70 mu m;
and 4, step 4: and (3) putting the filtered polyethylene powder and the ground slurry in the step (3) into a high-speed kneading machine in sequence for kneading to obtain a mixed material, wherein the feeding sequence is polyethylene powder-calcium stearate slurry-mica powder slurry-calcium powder slurry-graphite slurry, the feeding interval time is 4min, and the kneading time is 23 min.
And 5: banburying the kneaded mixture obtained in the step 4 in a banbury mixer for 9min at 90 ℃ to obtain a material mixture, wherein the temperature of the discharged material is 145 ℃;
step 6: and (5) putting the pellets obtained in the step (5) into an extruder for granulation to obtain the modified polyethylene plastic particles.
The method comprises the following steps of (1) heating, kneading, mixing, heating, kneading, cooling, kneading, extruding, cooling, kneading, cooling, kneading, cooling, kneading, cooling, kneading, cooling.
Example 3:
a preparation method of polyethylene reinforced modified plastic particles comprises the following raw materials in parts by weight: 55 parts of polyethylene waste, 5 parts of phthalate compounds, 7 parts of calcium powder, 10 parts of mica powder, 2 parts of calcium stearate powder and 3 parts of graphite;
as shown in fig. 1, the preparation method comprises the following specific steps:
step 1: washing the polyethylene waste by using a sodium hydroxide solution, and respectively crushing the polyethylene waste, graphite and mica powder into powder by using a crusher;
step 2: filtering polyethylene powder, calcium powder, mica powder, calcium stearate powder and graphite powder by using a filter screen, wherein the filter screen is 60 meshes;
and step 3: grinding the filtered additive calcium powder, mica powder, calcium stearate and graphite powder by a three-roll grinder respectively to obtain corresponding slurry, adding phthalate ester compounds as grinding fluid during grinding, wherein the weight ratio of the additive to the grinding fluid is 1:2, and the fineness of the slurry is 80 mu m;
and 4, step 4: and (3) putting the filtered polyethylene powder and the ground slurry in the step (3) into a high-speed kneading machine in sequence for kneading to obtain a mixed material, wherein the feeding sequence is polyethylene powder-calcium stearate slurry-mica powder slurry-calcium powder slurry-graphite slurry, the feeding interval time is 5min, and the kneading time is 25 min.
And 5: banburying the kneaded mixture obtained in the step 4 in a banbury mixer for 10min at 100 ℃ to obtain a material mixture, wherein the temperature of the discharged material is 150 ℃;
step 6: and (5) putting the pellets obtained in the step (5) into an extruder for granulation to obtain the modified polyethylene plastic particles.
The method comprises the following steps of (1) heating, kneading, mixing, cooling, kneading, mixing, kneading, cooling, kneading, mixing, kneading, cooling, kneading.
The preparation method of the polyethylene reinforced modified plastic particles in the first comparative example, the second comparative example and the third example is as follows:
and detecting the flame retardant effect of the prepared product, and finding that the second effect of the embodiment is optimal.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.
Claims (6)
1. A preparation method of polyethylene reinforced modified plastic particles is characterized by comprising the following steps: the feed comprises the following raw materials in parts by weight: 45-55 parts of polyethylene waste, 3-5 parts of phthalate compounds, 5-7 parts of calcium powder, 5-10 parts of mica powder, 1-2 parts of calcium stearate powder and 2-3 parts of graphite;
the preparation method comprises the following specific steps:
step 1: washing the polyethylene waste by using a sodium hydroxide solution, and respectively crushing the polyethylene waste, graphite and mica powder into powder by using a crusher;
step 2: filtering polyethylene powder, calcium powder, mica powder, calcium stearate powder and graphite powder by using a filter screen, wherein the filter screen is 40-60 meshes;
and step 3: grinding the filtered additive calcium powder, mica powder, calcium stearate and graphite powder by a three-roll grinder respectively to obtain corresponding slurry, adding phthalate ester compounds as grinding fluid during grinding, wherein the weight ratio of the additive to the grinding fluid is 1:2, and the fineness of the slurry is 60-80 μm;
and 4, step 4: putting the filtered polyethylene powder and the ground slurry obtained in the step 3 into a high-speed kneading machine in sequence for kneading to obtain mixed materials, wherein the feeding sequence is polyethylene powder-calcium stearate slurry-mica powder slurry-calcium powder slurry-graphite slurry, the feeding interval time is 3-5min, and the kneading time is 20-25 min;
and 5: placing the kneaded mixture obtained in the step 4 into an internal mixer for internal mixing to obtain a bulk material, wherein the internal mixing time is 8-10min, the internal mixing temperature is 80-100 ℃, and the temperature of the discharged material is 140-;
step 6: and (5) putting the pellets obtained in the step (5) into an extruder for granulation to obtain the modified polyethylene plastic particles.
2. The method for preparing polyethylene reinforced and modified plastic particles as claimed in claim 1, wherein the method comprises the following steps: the phthalate ester compound is di (2-ethylhexyl) phthalate.
3. The method for preparing polyethylene reinforced and modified plastic particles as claimed in claim 1, wherein the method comprises the following steps: and when the filter screen is used for filtering in the step 2, a cover is used for covering the filter screen.
4. The method for preparing polyethylene reinforced and modified plastic particles as claimed in claim 1, wherein the method comprises the following steps: the kneading time of heating kneading in the step 4 is 10-15min, the discharging temperature is 95-100 ℃, cooling kneading is carried out immediately after heating kneading is finished, the cooling kneading time is 5-10min, and the discharging temperature is below 50 ℃.
5. The method for preparing polyethylene reinforced and modified plastic particles as claimed in claim 1, wherein the method comprises the following steps: the internal mixer in the step 5 is 50L.
6. The method for preparing polyethylene reinforced and modified plastic particles as claimed in claim 1, wherein the method comprises the following steps: the granulator in the step 6 is a double-screw extruder, the extrusion temperature is 140-.
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| CN104044222A (en) * | 2013-03-11 | 2014-09-17 | 昆山宝腾橡塑胶材料科技有限公司 | Processing technology for plastic granules |
| CN106751212A (en) * | 2016-12-26 | 2017-05-31 | 张家港市大能塑料制品有限公司 | A kind of utilization waste material prepares the production technology of plastic grain |
| CN110744744A (en) * | 2019-10-28 | 2020-02-04 | 宁波万隆模塑成型有限公司 | Plastic particle production process |
| CN111688058A (en) * | 2020-07-23 | 2020-09-22 | 昆山聚亿源精密模具有限公司 | Plastic raw material preparation processing technology based on medical plastic product |
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- 2021-10-11 CN CN202111179671.5A patent/CN113831626A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104044222A (en) * | 2013-03-11 | 2014-09-17 | 昆山宝腾橡塑胶材料科技有限公司 | Processing technology for plastic granules |
| CN106751212A (en) * | 2016-12-26 | 2017-05-31 | 张家港市大能塑料制品有限公司 | A kind of utilization waste material prepares the production technology of plastic grain |
| CN110744744A (en) * | 2019-10-28 | 2020-02-04 | 宁波万隆模塑成型有限公司 | Plastic particle production process |
| CN111688058A (en) * | 2020-07-23 | 2020-09-22 | 昆山聚亿源精密模具有限公司 | Plastic raw material preparation processing technology based on medical plastic product |
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