CN107498816A - A kind of electric wire extrusion molding mould and preparation method thereof - Google Patents
A kind of electric wire extrusion molding mould and preparation method thereof Download PDFInfo
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- CN107498816A CN107498816A CN201710556873.4A CN201710556873A CN107498816A CN 107498816 A CN107498816 A CN 107498816A CN 201710556873 A CN201710556873 A CN 201710556873A CN 107498816 A CN107498816 A CN 107498816A
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- mould
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- external mold
- electric wire
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Classifications
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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
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/25—Component parts, details or accessories; Auxiliary operations
- B29C48/30—Extrusion nozzles or dies
-
- 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
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/25—Component parts, details or accessories; Auxiliary operations
- B29C48/30—Extrusion nozzles or dies
- B29C48/3001—Extrusion nozzles or dies characterised by the material or their manufacturing process
-
- 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
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/25—Component parts, details or accessories; Auxiliary operations
- B29C48/30—Extrusion nozzles or dies
- B29C48/3001—Extrusion nozzles or dies characterised by the material or their manufacturing process
- B29C48/3003—Materials, coating or lining therefor
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B13/00—Apparatus or processes specially adapted for manufacturing conductors or cables
- H01B13/22—Sheathing; Armouring; Screening; Applying other protective layers
- H01B13/24—Sheathing; Armouring; Screening; Applying other protective layers by extrusion
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- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Insulated Conductors (AREA)
Abstract
The invention discloses a kind of electric wire extrusion molding mould, including mould external mold and the plug being arranged inside mould external mold, sizing material runner is formed between the inwall of mould external mold and the outer wall of plug；The inwall of mould external mold is provided with the first fluoro-containing coating layer, and the outer wall of plug is provided with the second fluoro-containing coating layer.The invention also discloses a kind of preparation method of electric wire extrusion molding mould.The electric wire extrusion molding mould of the present invention have good antistick characteristic, high temperature resistant, low friction, it is corrosion-resistant good, wearability is good and use cost is low the characteristics of, suitable for accumulation in mouth model of the elimination flame-retardant electric wire and cable material high speed extrusion process.
Description
Technical field
The present invention relates to a kind of mould and preparation method thereof, more particularly to a kind of electric wire extrusion molding mould and its
Preparation method.
Background technology
In flame-retardant electric wire and cable extrusion process, because the small molecule in polymer formulators, fire retardant exist for a long time
Mouth mold punishment solution or the result of accumulation, are constantly separated out with the extension of process time, so as to form accumulation in mouth model.Accumulation in mouth model
Charing can make electric wire outer layer produce mouth mold line, accumulation excessively can with electric wire extrude be attached to shape on electric wire outer layer
Into ring so that scrapping.
In the prior art, commonly use solve accumulation in mouth model method be added in composition of raw materials the fluorine-containing processing aids of PPA or
Person's high molecular weight silicone series lubricant agent, them are made to form a layered low-surface energy film layer in mould inner surface in process, with
Reduce accumulation in mouth model.But the fluorine-containing processing aids of addition PPA or high molecular weight silicone series lubricant agent so that product per ton
Production cost rises 300-2000 members, the shortcomings that production cost height being present and be unfavorable for promoting.
The content of the invention
For overcome the deficiencies in the prior art, an object of the present invention is to provide a kind of electric wire extrusion die
Tool, the mould have good antistick characteristic, high temperature resistant, low friction, it is corrosion-resistant good, wearability is good and use cost is low the characteristics of, it is applicable
In accumulation in mouth model of the elimination flame-retardant electric wire and cable material in high speed extrusion process.
The second object of the present invention is to provide a kind of preparation method of electric wire extrusion molding mould, and it, which has, makes
Technique simple and stable, production efficiency are high, production cost is low and the characteristics of good product quality.
An object of the present invention adopts the following technical scheme that realization：
A kind of electric wire extrusion molding mould, including mould external mold and the plug that is arranged inside mould external mold, it is described
Sizing material runner is formed between the outer wall of the inwall of mould external mold and the plug；Characterized in that, the inwall of the mould external mold
The first fluoro-containing coating layer is provided with, the outer wall of the plug is provided with the second fluoro-containing coating layer.
Further, the first fluoro-containing coating layer, the thickness of the second fluoro-containing coating layer are 25-30 microns.
The second object of the present invention adopts the following technical scheme that realization：
A kind of preparation method of electric wire extrusion molding mould, it is characterised in that including：
Degreasing processing step：Degreasing processing is carried out respectively to mould external mold and plug with alkaline degreaser；
Cleaning step：After completing degreasing processing step, mould external mold and plug are cooled to room temperature respectively, with cleaning agent mould
Tool external mold and plug are cleaned respectively；
Sandblasting roughening treatment step：After completing cleaning step, with spray gun to the inwall of mould external mold and the outer wall point of plug
Carry out not sandblasting roughening treatment；
Rinse step：After completing sandblasting roughening treatment step, the outer wall of inwall and plug to mould external mold is carried out respectively
Rinsing is handled, and dries moisture；
Spraying process：After completing rinse step, fluoro-containing coating even application is formed first on the inwall of mould external mold
Fluoro-containing coating layer, fluoro-containing coating even application is formed to the second fluoro-containing coating layer on the outer wall of plug；
Sintering step：After completing spraying process, mould external mold and plug are respectively placed in 420-440 DEG C of baking oven and solidified
4-10 minutes are sintered, are made annealing treatment again after the completion of sintering, after toasting 1.5-2.5 hours at a temperature of 280-320 DEG C, are down to
Room temperature.
Further, in degreasing processing step, treatment temperature is 400 DEG C, and processing time is 3 hours.
Further, in sandblasting roughening treatment step, raw material is alumina grits used by spray gun, the pressure 7- of spray gun
8kg/cm2。
Further, in sandblasting roughening treatment step, alumina grits model 36#-60# Brown Alundums.
Further, in rinse step, comprising the following steps that for processing is rinsed：Under 60 DEG C of temperature conditionss, hydrogen is first used
Sodium hydroxide solution rinses 6 minutes；Rinsed twice with the hydrochloric acid solution of equivalent again, each rinsing time is 6 minutes；Finally with cleaning
Dried after agent rinsed clean.
Further, the cleaning agent in cleaning step and rinse step is deionized water.
Further, in rinse step, the molar concentration of sodium hydroxide solution is 0.3mol/L, hydrochloric acid solution it is mole dense
Spend for 0.3mol/L.
Further, in spraying process, more than one or both of fluoro-containing coating PTFE, FEP, PFA, ETFE, PPA
Mixing.
Further, in sintering step, sintering temperature is 430 DEG C, and sintering time is 5 minutes, and annealing baking temperature is 300
DEG C, annealing baking time is 2 hours.
The beneficial effects of the present invention are：
1st, the inwall of mould external mold of the invention is provided with the first fluoro-containing coating layer, and the outer wall of the plug is provided with second
Fluoro-containing coating layer；The coefficient of friction that the fluoro-containing coating on surface is contacted due to being sprayed on mould with material is far smaller than conventional metals
The coefficient of friction of mould, in polymer processing, it can form a layered low-surface energy between polymer and metal die
Film layer, this film layer reduces polymer melt and passes through resistance suffered during mould, so that small molecule, fire retardant etc. can not be
Accumulate to form accumulation in mouth model at mould outlet, and improve the surface quality of wire rod.Therefore, it has that antistick characteristic is good, resistance to height
Temperature, low friction, it is corrosion-resistant good, wearability is good and use cost is low the characteristics of.Through electric wire extrusion processing made of the present invention
Mould is especially suitable for low-smoke halogen-free material, fire-retardant TPU, fire-retardant TPE, fire-retardant TPV, flame-proof polyethylene, polypropylene flame redardant, high filling
The fire proofings such as elastomeric material are extruded and processed into type.
2nd, present invention optimizes processing step and parameter, without complicated processing, simultaneously as the non-stick of fluoro-containing coating,
Cleaning mold also shortens much without special purge material, clear time.Therefore, it has manufacture craft simple and stable, production effect
Rate is high, production cost is low and the characteristics of good product quality.
3rd, the method for commonly using solution accumulation in mouth model is that the fluorine-containing processing aids of PPA or high molecular weight silicone are added in formula
Series lubricant agent, them are made to form a layered low-surface energy film layer in mould inner surface in process, to reduce accumulation in mouth model.But
It is that 300~2000 yuan of material cost rising is per ton, with the mould average unit price of processing in batching of the present invention less than hundred yuan, and uses
Half a year finds no any damage, and cost advantage is obvious.
Embodiment
Below, with reference to embodiment, the present invention is described further, it is necessary to which explanation is, what is do not collided
Under the premise of, new embodiment can be formed between various embodiments described below or between each technical characteristic in any combination.Except spy
Outside very illustrating, employed in the present embodiment to material and equipment be commercially available.
A kind of electric wire extrusion molding mould, including mould external mold and the plug being arranged inside mould external mold, mould
Sizing material runner is formed between the inwall of external mold and the outer wall of plug；The inwall of mould external mold is provided with the first fluoro-containing coating layer, core
The outer wall of rod is provided with the second fluoro-containing coating layer.
As preferred embodiment, the first fluoro-containing coating layer, the thickness of the second fluoro-containing coating layer are 25-30 microns.
A kind of preparation method of electric wire extrusion molding mould, including：
Degreasing processing step：Degreasing processing is carried out respectively to mould external mold and plug with alkaline degreaser；
Cleaning step：After completing degreasing processing step, mould external mold and plug are cooled to room temperature respectively, with cleaning agent mould
Tool external mold and plug are cleaned respectively；
Sandblasting roughening treatment step：After completing cleaning step, with spray gun to the inwall of mould external mold and the outer wall point of plug
Carry out not sandblasting roughening treatment；
Rinse step：After completing sandblasting roughening treatment step, the outer wall of inwall and plug to mould external mold is carried out respectively
Rinsing is handled, and dries moisture；
Spraying process：After completing rinse step, fluoro-containing coating even application is formed first on the inwall of mould external mold
Fluoro-containing coating layer, fluoro-containing coating even application is formed to the second fluoro-containing coating layer on the outer wall of plug；
Sintering step：After completing spraying process, mould external mold and plug are respectively placed in 420-440 DEG C of baking oven and solidified
4-10 minutes are sintered, are made annealing treatment again after the completion of sintering, after toasting 1.5-2.5 hours at a temperature of 280-320 DEG C, are down to
Room temperature.
As preferred embodiment, in degreasing processing step, treatment temperature is 400 DEG C, and processing time is 3 hours.
As preferred embodiment, in sandblasting roughening treatment step, raw material is alumina grits used by spray gun, spray
The pressure 7-8kg/cm of rifle2。
As preferred embodiment, in sandblasting roughening treatment step, alumina grits model 36#-60# Brown Alundums.
As preferred embodiment, in order to handle grease, impurity that sandblasting may introduce etc., handled using soda acid rinsing
Comprise the following steps that：Under 60 DEG C of temperature conditionss, first rinsed 6 minutes with sodium hydroxide solution；It is molten with the hydrochloric acid of equivalent again
Liquid rinses (being for the first time the alkaline solution of neutralization mistake used above) twice, and each rinsing time is 6 minutes；Finally use cleaning agent
Dried after rinsed clean.
As preferred embodiment, the cleaning agent in cleaning step and rinse step is deionized water.
As preferred embodiment, in rinse step, the molar concentration of sodium hydroxide solution is 0.3mol/L, and hydrochloric acid is molten
The molar concentration of liquid is 0.3mol/L.
As preferred embodiment, in sintering step, sintering temperature is 430 DEG C, and sintering time is 5 minutes, and annealing is dried
Roasting temperature is 300 DEG C, and annealing baking time is 2 hours.
As preferred embodiment, in spraying process, fluoro-containing coating be with fluoro containing polymerses polymer (such as PTFE,
FEP, PFA, ETFE, PPA etc.) based on one or more kinds of fluoropolymers mixture coating.
Embodiment 1：
A kind of preparation method of electric wire extrusion molding mould, including：
Degreasing processing step：Degreasing processing is carried out respectively to mould external mold and plug with alkaline degreaser；
Cleaning step：After completing degreasing processing step, mould external mold and plug are cooled to room temperature respectively, with cleaning agent mould
Tool external mold and plug are cleaned respectively；
Sandblasting roughening treatment step：After completing cleaning step, with spray gun to the inwall of mould external mold and the outer wall point of plug
Carry out not sandblasting roughening treatment；Raw material is alumina grits used by spray gun, the pressure 7.5kg/cm of spray gun2.Aluminum oxide sand
Grain model 36# Brown Alundums.
Rinse step：After completing sandblasting roughening treatment step, the outer wall of inwall and plug to mould external mold is carried out respectively
Rinsing is handled；Rinsing processing comprises the following steps that：Under 60 DEG C of temperature conditionss, first rinsed 6 minutes with sodium hydroxide solution；
Again with hydrochloric acid solution rinsing twice, each rinsing time is 6 minutes；Finally use cleaning agent rinsed clean.Further, cleaning step
Cleaning agent in rapid and rinse step is deionized water.
Spraying process：After completing rinse step, fluoro-containing coating even application is formed into thickness on the inwall of mould external mold
For 30 microns of the first fluoro-containing coating layer, fluoro-containing coating even application forms on the outer wall of plug to thickness is 30 microns the
Two fluoro-containing coating layers；
Sintering step：After completing spraying process, mould external mold and plug are respectively placed in 430 DEG C of baking oven and solidify sintering
5 minutes, then after being toasted 2 hours at a temperature of 300 DEG C, it is down to room temperature.
Embodiment 2：
A kind of preparation method of electric wire extrusion molding mould, including：
Degreasing processing step：Degreasing processing is carried out respectively to mould external mold and plug with alkaline degreaser；
Cleaning step：After completing degreasing processing step, mould external mold and plug are cooled to room temperature respectively, with cleaning agent mould
Tool external mold and plug are cleaned respectively；
Sandblasting roughening treatment step：After completing cleaning step, with spray gun to the inwall of mould external mold and the outer wall point of plug
Carry out not sandblasting roughening treatment；Raw material is alumina grits used by spray gun, the pressure 7kg/cm of spray gun2.Alumina grits
Model 36# Brown Alundums.
Rinse step：After completing sandblasting roughening treatment step, the outer wall of inwall and plug to mould external mold is carried out respectively
Rinsing is handled；Rinsing processing comprises the following steps that：Under 60 DEG C of temperature conditionss, first rinsed 6 minutes with sodium hydroxide solution；
Again with hydrochloric acid solution rinsing twice, each rinsing time is 6 minutes；Finally use cleaning agent rinsed clean.Further, cleaning step
Cleaning agent in rapid and rinse step is deionized water.
Spraying process：After completing rinse step, fluoro-containing coating even application is formed into thickness on the inwall of mould external mold
For 25 microns of the first fluoro-containing coating layer, fluoro-containing coating even application forms on the outer wall of plug to thickness is 25 microns the
Two fluoro-containing coating layers；
Sintering step：After completing spraying process, mould external mold and plug are respectively placed in 420 DEG C of baking oven and solidify sintering
4 minutes, then after being toasted 1.5 hours at a temperature of 280 DEG C, it is down to room temperature.
Embodiment 3：
A kind of preparation method of electric wire extrusion molding mould, including：
Degreasing processing step：Degreasing processing is carried out respectively to mould external mold and plug with alkaline degreaser；
Cleaning step：After completing degreasing processing step, mould external mold and plug are cooled to room temperature respectively, with cleaning agent mould
Tool external mold and plug are cleaned respectively；
Sandblasting roughening treatment step：After completing cleaning step, with spray gun to the inwall of mould external mold and the outer wall point of plug
Carry out not sandblasting roughening treatment；Raw material is alumina grits used by spray gun, the pressure 8kg/cm of spray gun2.Alumina grits
Model 60# Brown Alundums.
Rinse step：After completing sandblasting roughening treatment step, the outer wall of inwall and plug to mould external mold is carried out respectively
Rinsing is handled；Rinsing processing comprises the following steps that：Under 60 DEG C of temperature conditionss, first rinsed 6 minutes with sodium hydroxide solution；
Again with hydrochloric acid solution rinsing twice, each rinsing time is 6 minutes；Finally use cleaning agent rinsed clean.Further, cleaning step
Cleaning agent in rapid and rinse step is deionized water.
Spraying process：After completing rinse step, fluoro-containing coating even application is formed into thickness on the inwall of mould external mold
For 30 microns of the first fluoro-containing coating layer, fluoro-containing coating even application forms on the outer wall of plug to thickness is 30 microns the
Two fluoro-containing coating layers.
Sintering step：After completing spraying process, mould external mold and plug are respectively placed in 440 DEG C of baking oven and solidify sintering
10 minutes, then after being toasted 2.5 hours at a temperature of 320 DEG C, it is down to room temperature.
Effect assessment
Extrusion test, wire rod processing line footpath 2.8mm, processing are carried out using embodiment 1-3 mould and common die respectively
Quantity is 1 myriametre, and fire proofing flame retardant rating is UL1581VW-1.Test result is referring to table 1.
Table 1：Using effect comparing result
Made of the present invention electric wire extrusion processing mold and high polymer material coefficient of friction 0.05-0.1 it
Between, the coefficient of friction of common metal mould and high polymer material is between 0.2-0.3, therefore, through low friction made of the present invention
Electric wire extrude processing mold especially suitable for low-smoke halogen-free material, fire-retardant TPU, fire-retardant TPE, fire-retardant TPV, flame-proof polyethylene,
The high viscosity fire proofings such as polypropylene flame redardant, high filled rubber material are extruded and processed into type.
Above-mentioned embodiment is only the preferred embodiment of the present invention, it is impossible to the scope of protection of the invention is limited with this,
The change and replacement for any unsubstantiality that those skilled in the art is done on the basis of the present invention belong to institute of the present invention
Claimed scope.
Claims (10)
1. a kind of electric wire extrusion molding mould, including mould external mold and the plug being arranged inside mould external mold, the mould
Have and sizing material runner is formed between the inwall of external mold and the outer wall of the plug；Characterized in that, on the inwall of the mould external mold
Provided with the first fluoro-containing coating layer, the outer wall of the plug is provided with the second fluoro-containing coating layer.
2. electric wire extrusion molding mould as claimed in claim 1, it is characterised in that the first fluoro-containing coating layer,
The thickness of two fluoro-containing coating layers is 25-30 microns.
3. the preparation method of electric wire extrusion molding mould as claimed in claim 1 or 2, it is characterised in that including：
Degreasing processing step：Degreasing processing is carried out respectively to mould external mold and plug with alkaline degreaser；
Cleaning step：After completing degreasing processing step, mould external mold and plug are cooled to room temperature respectively, with outside cleaning agent mould
Mould and plug are cleaned respectively；
Sandblasting roughening treatment step：After completing cleaning step, the inwall of mould external mold and the outer wall of plug are entered respectively with spray gun
Row sandblasting roughening treatment；
Rinse step：After completing sandblasting roughening treatment step, the outer wall of inwall and plug to mould external mold rinses respectively
Processing, dry moisture；
Spraying process：After completing rinse step, it is fluorine-containing that fluoro-containing coating even application is formed on the inwall of mould external mold to first
Dope layer, fluoro-containing coating even application is formed to the second fluoro-containing coating layer on the outer wall of plug；
Sintering step：After completing spraying process, mould external mold and plug are respectively placed in 420-440 DEG C of baking oven and solidify sintering
4-10 minutes, made annealing treatment again after the completion of sintering, after toasting 1.5-2.5 hours at a temperature of 280-320 DEG C, be down to room
Temperature.
4. the preparation method of electric wire extrusion molding mould as claimed in claim 3, it is characterised in that degreasing processing step
In, treatment temperature is 400 DEG C, and processing time is 3 hours.
5. the preparation method of electric wire extrusion molding mould as claimed in claim 3, it is characterised in that sandblasting roughening treatment
In step, raw material is alumina grits used by spray gun, the pressure 7-8kg/cm of spray gun2。
6. the preparation method of electric wire extrusion molding mould as claimed in claim 5, it is characterised in that sandblasting roughening treatment
In step, alumina grits model 36#-60# Brown Alundums.
7. the preparation method of electric wire extrusion molding mould as claimed in claim 3, it is characterised in that in rinse step,
Rinsing processing comprises the following steps that：Under 60 DEG C of temperature conditionss, first rinsed 6 minutes with sodium hydroxide solution；Equivalent is used again
Hydrochloric acid solution rinsing twice, each rinsing time be 6 minutes；Finally with being dried after cleaning agent rinsed clean.
8. the preparation method of electric wire extrusion molding mould as claimed in claim 7, it is characterised in that in rinse step,
The molar concentration of sodium hydroxide solution is 0.3mol/L, and the mass concentration of hydrochloric acid solution is 8%.
9. the preparation method of electric wire extrusion molding mould as claimed in claim 3, it is characterised in that in spraying process,
Fluoro-containing coating is that one or both of PTFE, FEP, PFA, ETFE, PPA are mixed above.
10. the preparation method of electric wire extrusion molding mould as claimed in claim 3, it is characterised in that in sintering step,
Sintering temperature is 430 DEG C, and sintering time is 5 minutes, and annealing baking temperature is 300 DEG C, and annealing baking time is 2 hours.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710556873.4A CN107498816A (en) | 2017-07-10 | 2017-07-10 | A kind of electric wire extrusion molding mould and preparation method thereof |
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| CN201710556873.4A CN107498816A (en) | 2017-07-10 | 2017-07-10 | A kind of electric wire extrusion molding mould and preparation method thereof |
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Cited By (5)
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| CN108428514A (en) * | 2018-04-26 | 2018-08-21 | 沈阳伊思特机器人自动化科技有限公司 | A kind of cable pulling formation system and cable pulling are molded drawing process |
| CN109501083A (en) * | 2018-12-28 | 2019-03-22 | 中国科学院上海有机化学研究所 | A kind of die surface processing method |
| CN110256772A (en) * | 2019-07-19 | 2019-09-20 | 江苏金陵奥普特高分子材料有限公司 | Low accumulation in mouth model polyolefin alloy thermoplastic elastomer (TPE) and preparation method thereof |
| CN112094461A (en) * | 2020-07-30 | 2020-12-18 | 中广核三角洲集团（苏州）特威塑胶有限公司 | Preparation method of dynamic vulcanization thermoplastic elastomer for improving die material accumulation |
| CN114055743A (en) * | 2021-11-11 | 2022-02-18 | 内蒙古久泰新材料有限公司 | Alkyd polyester and extrusion method of compound thereof |
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| CN112094461A (en) * | 2020-07-30 | 2020-12-18 | 中广核三角洲集团（苏州）特威塑胶有限公司 | Preparation method of dynamic vulcanization thermoplastic elastomer for improving die material accumulation |
| CN114055743A (en) * | 2021-11-11 | 2022-02-18 | 内蒙古久泰新材料有限公司 | Alkyd polyester and extrusion method of compound thereof |
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Application publication date: 20171222 |