CN107987483B - Method for quickly manufacturing injection mold - Google Patents
Method for quickly manufacturing injection mold Download PDFInfo
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- CN107987483B CN107987483B CN201711433077.8A CN201711433077A CN107987483B CN 107987483 B CN107987483 B CN 107987483B CN 201711433077 A CN201711433077 A CN 201711433077A CN 107987483 B CN107987483 B CN 107987483B
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- injection mold
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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
- C08L63/00—Compositions of epoxy resins; Compositions of derivatives of epoxy resins
-
- 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
- B29C33/00—Moulds or cores; Details thereof or accessories therefor
- B29C33/38—Moulds or cores; Details thereof or accessories therefor characterised by the material or the manufacturing process
- B29C33/3842—Manufacturing moulds, e.g. shaping the mould surface by machining
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G59/00—Polycondensates containing more than one epoxy group per molecule; Macromolecules obtained by polymerising compounds containing more than one epoxy group per molecule using curing agents or catalysts which react with the epoxy groups
- C08G59/18—Macromolecules obtained by polymerising compounds containing more than one epoxy group per molecule using curing agents or catalysts which react with the epoxy groups ; e.g. general methods of curing
- C08G59/40—Macromolecules obtained by polymerising compounds containing more than one epoxy group per molecule using curing agents or catalysts which react with the epoxy groups ; e.g. general methods of curing characterised by the curing agents used
- C08G59/50—Amines
- C08G59/5026—Amines cycloaliphatic
-
- 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
- C08K3/08—Metals
- C08K2003/0812—Aluminium
Abstract
The invention belongs to the field of injection mold manufacturing, and particularly relates to a mixed resin for quickly manufacturing an injection mold and a method for quickly manufacturing the injection mold, wherein the mixed resin for quickly manufacturing the injection mold comprises the following components: the epoxy resin, the polyether amine and the aluminum powder, wherein the mass ratio of the epoxy resin to the polyether amine to the aluminum powder is 100 (38-45) to 500-800). The invention provides a mixed resin for quickly manufacturing an injection mold and a method for quickly manufacturing the injection mold, wherein the mixed resin is used for replacing metal to manufacture the injection mold, so that the production of the injection mold is completed in a very short time, and the production capacity of small-batch injection parts is realized.
Description
Technical Field
The invention belongs to the field of injection mold manufacturing, and particularly relates to a method for quickly manufacturing an injection mold.
Background
At present, China vigorously advocates and develops the rapid prototyping manufacturing industry, however, the existing injection molds are all made of metal, and the defects that the rapid prototyping produced prototype part cannot meet the technical requirements and the batch requirements of product parts exist.
Therefore, in view of these problems, it is important to provide a method for manufacturing an injection mold rapidly, which uses resin instead of metal to complete the production of the injection mold in an extremely short time, and which provides the production capability of small-lot injection-molded parts.
Disclosure of Invention
The invention provides a method for quickly manufacturing an injection mold, which aims to solve the technical problems in the prior art and uses resin to replace metal to manufacture the injection mold, thereby achieving the production of the injection mold in a very short time and forming the production capacity of small-batch injection parts.
The technical scheme adopted by the invention for solving the technical problems in the prior art is as follows:
a method of rapidly manufacturing an injection mold, the method of rapidly manufacturing an injection mold comprising the steps of:
the method comprises the following steps: manufacturing a prototype part, an insert matched with the prototype part, a parting surface and a metal mold frame;
step two: installing an insert, a parting surface and a prototype part in the metal mold frame;
step three: sealing the gap between the parting surface and the metal frame and the gap between the parting surface and the prototype part;
step four: first half-mold casting is performed using a hybrid resin comprising: the epoxy resin, the polyether amine and the aluminum powder, wherein the mass ratio of the epoxy resin to the polyether amine to the aluminum powder is 100 (38-45) to 500-800);
step five: cleaning the insert and the parting surface, and positioning a second half die and the first half die;
step six: and putting the two half moulds in a mould closing state together in an oven for post-curing treatment and heat treatment of epoxy resin, and carrying out demoulding and polishing treatment.
The invention can also adopt the following technical scheme:
in the above method for rapidly manufacturing an injection mold, the mass ratio of the epoxy resin, the polyetheramine and the aluminum powder is 100:41: 500.
In the method for rapidly manufacturing the injection mold, the prototype part is subjected to polishing treatment, paint spraying treatment and sand blasting treatment, wherein the paint spraying treatment adopts a spray gun to spray primer and finish paint on the surface of the prototype part; the polishing treatment adopts 150-; the grain boundary material of the sand blasting treatment is white corundum, the particle size is 0.3mm, and the air pressure is 3-5 atmospheric pressures.
In the method for rapidly manufacturing an injection mold, before the mixed resin is mixed and stirred, the epoxy resin is heated to 40 ℃, the volume of a container for stirring is more than twice of the volume of the mixed resin, the stirring is started at a low speed by a stirrer, the stirring speed is started to be 5-10 HZ, the stirring speed is gradually increased until the stirring speed is 25-30 HZ, and the stirring is continued for 10-15 minutes.
In the method for rapidly manufacturing the injection mold, further, before casting, the mixed resin is placed in a vacuum box, the mixed resin is subjected to first air exhaust, the vacuum degree of the vacuum box is gradually increased to-76 mm Hg, the air exhaust time lasts for about 20 minutes until the surface of the resin is stable, after casting, second air exhaust is performed, the vacuum degree of the vacuum box is gradually increased to-76 mm Hg, and the air exhaust time lasts for about 10 minutes.
In the method for rapidly manufacturing the injection mold, further, the metal mold frame is provided with an ejector rod for demolding, the metal mold frame is provided with an epoxy resin pouring port and an epoxy resin exhaust port, the metal mold frame is provided with a guide pillar and a guide sleeve for positioning, and the metal mold frame is provided with a cooling pipeline and a heating pipeline.
In the method for rapidly manufacturing the injection mold, further, the curing treatment in the sixth step is to place the two half molds in the mold closing state together in an oven at 60 ℃ for 2 hours, the heat treatment in the sixth step is to gradually increase the temperature at a rate of 20 ℃ for 1 hour, then to maintain the temperature for 2 hours, then to gradually increase the temperature at a rate of 20 ℃ per hour, until the temperature reaches 160 ℃ and to maintain the temperature for 2 hours, to stop heating, and to cool the mold to room temperature along with the oven.
In the method for rapidly manufacturing the injection mold, further, in the grinding treatment in the sixth step, a milling machine is used for processing the redundant epoxy resin, the rear surface of the metal frame is used as the standard of the epoxy resin, the thickness of the epoxy resin is 0.3-0.5 mm higher than that of the metal frame, and the surface of the mold cavity is ground and polished.
The invention has the advantages and positive effects that:
1. the invention uses resin to replace metal to manufacture the injection mold, uses high-temperature epoxy and aluminum powder to manufacture the mold core, and fixes the mold core on the metal injection mold frame, thereby achieving the purpose of finishing the production of the injection mold in a very short time and forming the production capacity of small-batch injection molding parts.
2. The invention can remove the air in the mixed resin by carrying out vacuum exhaust twice, and further, the second exhaust process is to exhaust the air between the original part and the mixed resin, better copy the surface of the original part and simultaneously eliminate the condition of incomplete pouring.
3. The invention uses self-developed high temperature resistant epoxy resin, and has the advantages of low viscosity and high strength compared with the prior resin.
Detailed Description
To further understand the contents, features and effects of the present invention, the following examples are illustrated:
a hybrid resin for rapid manufacturing of an injection mold, the hybrid resin for rapid manufacturing of an injection mold comprising: the epoxy resin, the polyether amine and the aluminum powder, wherein the mass ratio of the epoxy resin to the polyether amine to the aluminum powder is 100 (38-45) to 500-800).
Still further, it is also contemplated in the present invention that the mass ratio of the epoxy resin, the polyetheramine and the aluminum powder is 100:41: 500.
The special modified polyether amine for Comptost can be used, and has the advantages of low heat release, high temperature resistance and high pressure resistance.
The invention uses self-developed high temperature resistant epoxy resin, and has the advantages of low viscosity and high strength compared with the prior resin. Table 1 is a comparison of the modified epoxy resins of the present application with conventional epoxy resins of the prior art.
Table 1: comparison of the modified epoxy resins of the present application with common epoxy resins of the prior art
A method of rapidly manufacturing an injection mold, the method of rapidly manufacturing an injection mold comprising the steps of:
the method comprises the following steps: manufacturing a prototype part, an insert matched with the prototype part, a parting surface and a metal mold frame;
step two: installing an insert, a parting surface and a prototype part in the metal mold frame;
step three: sealing the gap between the parting surface and the metal frame and the gap between the parting surface and the prototype part;
step four: performing first half-mold casting by using the mixed resin of any one of the above and curing;
step five: cleaning the insert and the parting surface, and positioning a second half die and the first half die;
step six: and putting the two half moulds in a mould closing state together in an oven for post-curing treatment and heat treatment of epoxy resin, and carrying out demoulding and polishing treatment.
The invention uses resin to replace metal to manufacture the injection mold, uses high-temperature epoxy and aluminum powder to manufacture the mold core, and fixes the mold core on the metal injection mold frame, thereby achieving the purpose of finishing the production of the injection mold in a very short time and forming the production capacity of small-batch injection molding parts. Taking the opening of a front shell of a certain brand of mobile phone as an example, table 2 shows the comparison between the processing time of the resin injection mold and the processing time of the traditional machining mold in the prior art.
Table 2: comparison of processing time of resin injection mold and traditional machining mold
Further, in the present invention, it is also considered that, before the mixed resin is mixed and stirred, the epoxy resin is heated to 40 ℃ and the volume of the container for stirring is twice or more of the volume of the mixed resin, and stirring is started at a low speed by the stirrer, the stirring speed is started to be 5 to 10Hz, the stirring speed is gradually increased until the stirring speed is 25 to 30Hz, and the stirring is continued for 10 to 15 minutes.
Still further, it is also contemplated in the present invention that the mixed resin is placed in a vacuum box before casting, the mixed resin is first evacuated, the vacuum degree of the vacuum box is gradually increased to-76 mm hg, the evacuation time is continued for about 20 minutes until the surface of the resin is stabilized, and a second evacuation is performed after casting, the vacuum degree of the vacuum box is gradually increased to-76 mm hg, and the evacuation time is continued for about 10 minutes.
The invention can remove the air in the mixed resin by carrying out vacuum exhaust twice, and further, the second exhaust process is to exhaust the air between the original part and the mixed resin, better copy the surface of the original part and simultaneously eliminate the condition of incomplete pouring.
Still further, it is also contemplated in the present invention that the prototype is subjected to a polishing process, a buffing process, a painting process and a blasting process, the painting process spraying a primer and a finish to the surface of the prototype with a spray gun; the polishing treatment adopts 400-2000 sand paper treatment; the polishing treatment adopts 150-; the grain boundary material of the sand blasting treatment is white corundum, the particle size is 0.3mm, and the air pressure is 3-5 atmospheric pressures.
The metal mold frame is provided with a push rod for demolding, an epoxy resin pouring port and an epoxy resin exhaust port, a guide pillar and a guide sleeve for positioning are arranged on the metal mold frame, and a cooling pipeline and a heating pipeline are arranged on the metal mold frame.
It should be noted that, in the curing treatment in the sixth step, two half molds in a mold closing state are placed together in an oven at 60 ℃ for 2 hours, and the heat treatment in the sixth step is to gradually raise the temperature at a rate of 20 degrees for 1 hour, then to maintain the temperature for 2 hours, and then to gradually raise the temperature at a rate of 20 degrees per hour, until the temperature reaches 160 ℃ and to maintain the temperature for 2 hours, to stop heating, and to cool the mold to room temperature along with the oven.
The polishing treatment in the sixth step is to process off the excess epoxy resin by using a milling machine, take the rear surface of the metal frame as the reference of the epoxy resin, make the thickness of the epoxy resin 0.3-0.5 mm higher than that of the metal frame, and polish the surface of the die cavity.
By way of example, in this example, the following steps are performed:
the method comprises the following steps: preparing a metal mold frame, wherein the metal mold frame is used for increasing the mechanical strength and the hardness of a mold surface, accurately positioning a mold and reducing the price of the mold.
The metal mold frame should be equipped with ejector pins for demolding.
The thermal linear expansion coefficient of the metal frame should be equal to or close to that of the epoxy resin.
The metal frame should be mountable as a backing plate to the prototype parting plane.
The metal frame should provide a complete epoxy sprue and epoxy vent.
The metal frame should also have cooling and heating ducts if required.
The metal frame should ensure the safety of the mold core cavity during injection molding.
The metal frame should have a guide post and a guide sleeve for positioning.
Preferably, a standard form is selected if conditions are met.
Step two: prototype part
By way of example, in the present embodiment, the prototype can be 3D printed prototype (including SLA \ SLS \ FDM, etc.), plastic part, wood mold, CNC machined prototype.
Polishing the surface of the prototype part to obtain a high-quality part:
if it is desired to inject a filler pair into the prototype surface radius after removing the support, there are dents and some defects on the prototype surface.
And (5) painting the found and determined defects.
Spraying paint on the surface of the prototype part, and spraying primer and finish paint on the surface of the prototype part by using a spray gun.
Acceptable surface finish was accomplished with water sandpaper (sandpaper number 400-2000). If sandpaper is to be used to clean the entire surface.
And (3) carrying out acceptable polishing on the surface of the prototype by using water sand paper (the model of the sand paper is 150-2500).
The prototype was grit blasted for matte surfaces.
The grain boundary of the sand blasting machine is white corundum, and the pressure of air with the grain size of 0.3mm is 3-5 atmospheric pressures.
Step three: preparation of suitable prototype inserts, which are primarily intended for the shaping of the fine structures of injection-molded parts, also called molded inserts
Ensuring easy insertion of the metal insert into the mould by adjusting the dimensions and the diameter of the hole.
Ensuring the mounting on the parting plane.
Step four: die cavity and die core made of HE2008 epoxy resin and aluminum powder
A. Preparing to pour the first half mould
The parting plane and the prototype are closed along the parting line with a special plasticine or putty paste filling.
The prototype was placed in a mold frame. According to the positioning reference between the mould frame and the prototype.
All gaps are sealed between the parting surface and the metal frame, and only necessary air leakage holes are reserved when epoxy resin is poured.
If a cooling system is needed, the prefabricated copper pipe water channels can be fixed in the mold frame together.
For the epoxy resin to form a mold frame, the height of the mold frame should be equal to the height of the epoxy resin mold core.
The prototype surface was painted twice with 841 release agent.
The prototype is fixed and positioned in the corresponding position of the mold frame using an adhesive.
B. Casting a first mold half
The epoxy HE2008 is heated to 40 c which will minimize the resin viscosity and ensure adequate mixing of the two components.
Respectively weighing the required epoxy resin, polyether amine and aluminum powder, wherein the mass ratio of the epoxy resin, the polyether amine and the aluminum powder is 100 (38-45): 500-800), and when the mass ratio of the epoxy resin, the polyether amine and the aluminum powder is 100 (38-45): 500-800), the method can be used. In this embodiment, the ratio of the epoxy resin, the polyetheramine, and the aluminum powder is: 100 parts of epoxy resin; 41 parts of polyetheramine; 500 parts of aluminum powder.
100 parts of epoxy resin and 41 parts of solidified and 500 parts of aluminum powder are stirred, and the volume of a stirring container is more than twice of the volume of the mixed resin, so that the resin can not overflow during vacuum defoaming.
Starting to stir at a low speed by the stirrer, and gradually increasing the stirring speed for about 10-15 minutes.
The mixed resin is put into a vacuum box, and air mixed in the resin is defoamed. The vacuum in the vacuum chamber was gradually increased to-76 mm Hg. The air exhaust time lasts for about 20 minutes until the resin surface is stabilized.
After the resin is debubbled, the resin is poured into a first mold half. The prototype surface was painted with resin using a soft brush in order to obtain a better replica of the prototype surface.
The first half mold in the metal frame into which the resin has been poured is placed in a vacuum box and the second evacuation is performed just as the first evacuation. The second exhaust was continued for 10 minutes. This venting process will expel air between the prototype and the resin, better replicating the surface of the prototype. Meanwhile, the condition of incomplete pouring is eliminated;
after 12 hours of curing at room temperature, the epoxy resin is ready to be machined and the second mold half is ready for casting.
C. Casting the second half-mould
The first mold half is fixed.
And (4) cleaning the parting surface and the embedded part, and carefully avoiding damaging the prototype in the process. And if the parting surface needs to be polished, polishing the surface by using water sand paper (No. 320-800).
A cooling system is designed for the second mold half. And positioning the cooling system within the mold frame.
And (4) coating a release agent twice on the surface and the parting surface of the prototype, and polishing by using silk cloth.
And positioning the mold frame and the upper half mold frame.
And (4) continuing to cast the epoxy resin by using the step B of the step four.
D. Demoulding and heat treatment
After 12 hours of curing at room temperature, the two mold halves together (in this case the two mold halves are closed) are placed in an oven at 60 ℃ for the post-curing treatment and the epoxy resin is heat-treated.
The heat treatment is carried out by raising the temperature to 20 ℃ for 1 hour and keeping the temperature for 2 hours until the temperature reaches 160 ℃, and then the temperature is cooled to room temperature along with the furnace after the temperature is kept for 2 hours. And (5) preparing to open the mold.
By using the demoulding device with screws designed in the metal frame, the movement of the demoulding device is avoided. The prototype was removed by separating the mold halves with a wooden tool. The mold forms a mold cavity. The demolding device can be used for demolding by using a mechanical ejection device, a pneumatic ejection device or a combination of the two ejection devices. If the mold stripping device is very high, the mold stripping needs to be carried out manually. However, if the tapered surface were to be easily removed.
E. Surface polishing of die cavity and die core
The machining work is performed by a general-purpose machine.
Excess epoxy resin is machined away by a milling machine, and the reference of the epoxy resin should be the rear surface of the metal frame. The best method is that the thickness of the epoxy resin is 0.3-0.5 mm higher than that of the metal frame. And grinding and polishing the surface of the die cavity.
In summary, the present invention can provide a mixed resin for rapidly manufacturing an injection mold and a method for rapidly manufacturing an injection mold, which can achieve the production of an injection mold in an extremely short time, the production capacity of forming a small lot of injection-molded parts, by using a resin instead of a metal to manufacture an injection mold.
The present invention has been described in detail with reference to the above examples, but the description is only for the preferred examples of the present invention and should not be construed as limiting the scope of the present invention. All equivalent changes and modifications made within the scope of the present invention shall fall within the scope of the present invention.
Claims (8)
1. A method for quickly manufacturing an injection mold is characterized in that: the method for rapidly manufacturing the injection mold comprises the following steps:
the method comprises the following steps: manufacturing a prototype part, an insert matched with the prototype part, a parting surface and a metal mold frame;
step two: installing an insert, a parting surface and a prototype part in the metal mold frame;
step three: sealing the gap between the parting surface and the metal frame and the gap between the parting surface and the prototype part;
step four: first half-mold casting is performed using a hybrid resin comprising: the epoxy resin, the polyether amine and the aluminum powder, wherein the mass ratio of the epoxy resin to the polyether amine to the aluminum powder is 100 (38-45) to 500-800);
step five: cleaning the insert and the parting surface, and positioning a second half die and the first half die;
step six: and putting the two half moulds in a mould closing state together in an oven for post-curing treatment and heat treatment of epoxy resin, and carrying out demoulding and polishing treatment.
2. A method for rapid manufacturing of an injection mold according to claim 1, characterized in that: the mass ratio of the epoxy resin to the polyether amine to the aluminum powder is 100:41: 500.
3. A method for rapid manufacturing of an injection mold according to claim 1, characterized in that: before the mixed resin is mixed and stirred, the epoxy resin is heated to 40 ℃, the volume of a container for stirring is more than twice of the volume of the mixed resin, the stirring is started at a low speed by a stirrer, the initial stirring speed is 5-10 HZ, the stirring speed is gradually increased until the stirring speed is 25-30 HZ, and the continuous stirring time is 10-15 minutes.
4. A method for rapid manufacturing of an injection mold according to claim 3, characterized in that: placing the mixed resin in a vacuum box before casting, performing primary air exhaust on the mixed resin, gradually increasing the vacuum degree of the vacuum box to-76 mm Hg, keeping the air exhaust time for about 20 minutes until the surface of the resin is stable, performing secondary air exhaust after casting, gradually increasing the vacuum degree of the vacuum box to-76 mm Hg, and keeping the air exhaust time for about 10 minutes.
5. A method for rapid manufacturing of injection molds according to claim 4, characterized in that: polishing, painting and blasting the prototype, wherein the painting adopts a spray gun to spray primer and finish on the surface of the prototype; the polishing treatment adopts 400-2000 sand paper treatment; the polishing treatment adopts 150-; the grain boundary material of the sand blasting treatment is white corundum, the particle size is 0.3mm, and the air pressure is 3-5 atmospheric pressures.
6. A method for rapid manufacturing of an injection mold according to claim 1, characterized in that: the metal mold frame is provided with a push rod for demolding, an epoxy resin pouring port and an epoxy resin exhaust port, the metal mold frame is provided with a guide pillar and a guide sleeve for positioning, and the metal mold frame is provided with a cooling pipeline and a heating pipeline.
7. A method for rapid manufacturing of an injection mold according to claim 1, characterized in that: and in the curing treatment in the sixth step, the two half moulds in the mould closing state are placed in an oven at 60 ℃ for 2 hours, the temperature is gradually increased at the speed of increasing the temperature by 20 ℃ for 1 hour in the heat treatment in the sixth step, then the temperature is gradually increased at the speed of increasing the temperature by 20 ℃ per hour after the temperature is maintained for 2 hours, the temperature is stopped from being increased until the temperature reaches 160 ℃ and the temperature is maintained for 2 hours, and the mould is cooled to the room temperature along with the oven.
8. A method for rapid manufacturing of an injection mold according to claim 1, characterized in that: and in the sixth step, the grinding treatment adopts a milling machine to process off the redundant epoxy resin, the rear surface of the metal frame is taken as the standard of the epoxy resin, the thickness of the epoxy resin is 0.3-0.5 mm higher than that of the metal frame, and the surface of the die cavity is ground and polished.
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| US6939123B2 (en) * | 2002-12-26 | 2005-09-06 | 3M Innovative Properties Company | Electroformed adhesive laminated tooling surface with precision structured interfaces |
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| CN101664975A (en) * | 2008-09-04 | 2010-03-10 | 郑州宇通集团有限公司 | Method for preparing LFI-PUR reinforced injection product mold |
| CN103788582A (en) * | 2013-12-26 | 2014-05-14 | 青岛海洋新材料科技有限公司 | Pouring type epoxy composite filling material and production method thereof |
| CN106142414A (en) * | 2016-07-29 | 2016-11-23 | 柳州快速制造工程技术有限公司 | A kind of method utilizing silica gel mould manufactured parts |
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| WO2002043942A1 (en) * | 2000-11-30 | 2002-06-06 | Ceram Research Limited | Injection mould having a porous surface and method of using it |
| CN103589112A (en) * | 2013-09-24 | 2014-02-19 | 张家港市锦丰润尔发五金塑料厂 | Cured epoxy resin, injection mould and production method thereof |
| CN103589114A (en) * | 2013-10-15 | 2014-02-19 | 昆山市奋发绝缘材料有限公司 | Vacuum insulating material and preparation method thereof |
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