CN112778733A - Full-biodegradable material and injection molding process thereof - Google Patents
Full-biodegradable material and injection molding process thereof Download PDFInfo
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- CN112778733A CN112778733A CN202011596961.5A CN202011596961A CN112778733A CN 112778733 A CN112778733 A CN 112778733A CN 202011596961 A CN202011596961 A CN 202011596961A CN 112778733 A CN112778733 A CN 112778733A
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- biodegradable material
- injection molding
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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
- C08L69/00—Compositions of polycarbonates; Compositions of derivatives of polycarbonates
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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
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/0001—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor characterised by the choice of material
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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
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/17—Component parts, details or accessories; Auxiliary operations
- B29C45/76—Measuring, controlling or regulating
- B29C45/78—Measuring, controlling or regulating of temperature
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2201/00—Properties
- C08L2201/06—Biodegradable
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/02—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/03—Polymer mixtures characterised by other features containing three or more polymers in a blend
- C08L2205/035—Polymer mixtures characterised by other features containing three or more polymers in a blend containing four or more polymers in a blend
Abstract
The invention discloses a full-biodegradable material and an injection molding process thereof, wherein the full-biodegradable material comprises the following components in parts by weight: the biological resin is prepared by mixing bamboo powder, cassava powder, biological resin, PLA, PBS and talcum powder and then carrying out biological enzyme catalysis; the injection molding process of the full-biodegradable material comprises the following steps: preheating the fully biodegradable material to 50-70 ℃; heating the preheated full-biodegradable material to the temperature of 120-150 ℃ to a molten state; injecting the full-biodegradable material in a molten state into a mold cavity, and maintaining the pressure for a short time T1; after the product is injection molded, cooling the plastic mold, rapidly cooling the mold cavity from 140-160 ℃ to 10-15 ℃ in a short time T2 during injection molding, and demolding to obtain the product. The injection product produced by adopting the formula and the process has higher strength on the surface and stronger flexibility in the interior, and can meet the requirements of various use occasions; after the injection molding product is used, the product can be completely degraded in about 180 days of composting, and is green and environment-friendly.
Description
Technical Field
The invention relates to a degradable full-biological material injection molding process which is applied to the field of environmental protection.
Background
The existing products made of common biodegradable materials by injection molding, such as PLA materials and the like, are brittle and easy to break, and cannot meet a plurality of use occasions. And the PLA material is restricted by foreign countries, so that the cost of the PLA is high, and the PLA material is not beneficial to industrial application.
Disclosure of Invention
The technical problem to be solved by the invention is to overcome the defects of the prior art and provide a full-biodegradable material and an injection molding process thereof.
The technical scheme adopted by the invention for solving the technical problems is as follows: a fully biodegradable material comprising: bamboo powder, starch, biological resin, PLA, PBS and talcum powder, and the components are mixed and then catalyzed by biological enzyme to prepare the bamboo powder.
The components are as follows according to the mass ratio: 5-8 parts of bamboo powder, 10-15 parts of starch, 25-30 parts of biological resin, 15-20 parts of PLA, 5-25 parts of PBS and 10-20 parts of talcum powder.
The particle size of the bamboo powder is 800-1200 meshes.
The starch comprises: tapioca flour, sweet potato flour or potato flour.
An injection molding process of a full-biodegradable material comprises the following steps:
s1, preheating the fully biodegradable material to 50-70 ℃;
s2, heating the preheated full-biodegradable material to the temperature of 120-150 ℃ to a molten state;
s3, injecting the full-biodegradable material in a molten state into a mold cavity, and keeping the pressure for a short time T1; after the product is injection molded, cooling the plastic mold, rapidly cooling the mold cavity from 140-160 ℃ to 10-15 ℃ in a short time T2 during injection molding, and demolding to obtain the product.
Wherein the short time T1 in step S3 is 50 ms.
Wherein the short time T2 in step S3 is 1S.
All steps are completed using an injection molding machine.
Compared with the prior art, the invention has the beneficial effects that:
the injection product produced by adopting the formula and the process has higher strength on the surface and stronger flexibility in the interior, and can meet the requirements of various use occasions; after the injection product is used, the product can be completely degraded under the composting condition of about 180 days, and the microorganisms can phagocytize and digest the product and decompose the product into CO2And H2And O, the standard conforms to EN13432, does not pollute the environment, and is green and environment-friendly.
The fully biodegradable material is prepared by adding PBS on the basis of PLA, adding bamboo powder, cassava powder, biological resin and the like, mixing various materials, wherein the mixed materials are completely biodegradable materials, so that compared with the single use of PLA or PBS, the cost is greatly reduced, and the industrial application is facilitated; and the melting point of this material is lower than that of PLA.
Detailed Description
The present invention will be further described with reference to specific embodiments.
The injection molding process of the full-biodegradable material designed by the preferred embodiment of the invention mainly comprises the following steps:
s1, preheating the fully biodegradable material to 50-70 ℃;
s2, heating the preheated full-biodegradable material to the temperature of 120-150 ℃ to a molten state;
s3, injecting the full-biodegradable material in a molten state into a mold cavity, and keeping the pressure for a short time T1; after the product is injection molded, cooling water is injected into the plastic mold, so that the temperature of the mold cavity is rapidly cooled to 10-15 ℃ from 140-160 ℃ in the injection molding process in a short time T2, and the product is obtained by demolding, wherein the surface of the product has higher strength and the interior of the product has higher flexibility.
Wherein the short time T1 in step S3 is specifically 50ms, and the short time T2 is specifically 1S.
The full-biodegradable material comprises the following components in percentage by mass: 5-8 parts of bamboo powder, 10-15 parts of cassava powder, 25-30 parts of biological resin, 15-20 parts of PLA, 5-25 parts of PBS and 10-20 parts of talcum powder, and the components are mixed and then are catalyzed by biological enzymes to prepare the wood-plastic composite material. Wherein, the main component of the biological resin is PPC, namely polymethyl ethylene carbonate, PLA is polylactic acid, also called polylactide, and PBS is poly butylene succinate.
The particle size of the bamboo powder is 800-1200 meshes, the full-biodegradable material with the particle size has good fluidity in a molten state, the smaller the particle size, the better the fluidity, and the finally obtained product has good performance and excellent strength, bending modulus and elastic modulus. The cassava flour can also be replaced by sweet potato flour, potato flour and other starches.
The process adopts the segmented heating full-biodegradable material, and has the advantages that: firstly, the resistance of screw feeding can be reduced to the material under the non-melting state, and this is the structure of injection molding machine and decides, secondly can practice thrift the electric energy that the heating consumed, thirdly can prevent that the material from producing the decomposition under long-time high temperature state.
Please refer to table one:
the effect of the dwell pressure of 50ms is: and a pressure is kept during melting, solidification and shrinkage, and the molten liquid is continuously injected to fill up the shrinkage space, so that the generation of product dents is reduced or avoided, and the appearance yield is increased. The ten groups of experimental data in the table I show that the pressure is maintained in the die cavity for 50ms, and the appearance yield of the obtained product is highest. If the pressure maintaining time is increased, the increase of the appearance yield tends to be gentle, so that the pressure maintaining time of 50ms is optimal based on the consideration of cost and yield.
The purpose of rapid cooling within 1s of the temperature of the die cavity is to ensure that the surface of the product has higher strength and the interior of the product has stronger flexibility. From the ten sets of experimental data in table one, it can be seen that the bending modulus of the product exhibited the worst without rapid cooling, and that the bending modulus of the product improved somewhat when rapid cooling was performed for 3 seconds, but did not exhibit the rapid cooling within 1 second. Therefore, the time for rapidly cooling the cavity temperature is limited to 1 s.
All steps of the process are finished by using an injection molding machine, preheating, heating and injection molding cooling are carried out, and the preheating and heating steps have no specific time requirement and only can meet the temperature requirement.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention in any way, and any indirect modifications, equivalent changes and modifications made to the above embodiment according to the technical spirit of the present invention by those skilled in the art are within the technical scope of the present invention.
Claims (8)
1. A fully biodegradable material, comprising: bamboo powder, starch, biological resin, PLA, PBS and talcum powder, and the components are mixed and then catalyzed by biological enzyme to prepare the bamboo powder.
2. The completely biodegradable material according to claim 1, wherein the material comprises the following components in parts by mass: 5-8 parts of bamboo powder, 10-15 parts of starch, 25-30 parts of biological resin, 15-20 parts of PLA, 5-25 parts of PBS and 10-20 parts of talcum powder.
3. The completely biodegradable material as claimed in claim 1, wherein the particle size of the bamboo powder is 800-1200 mesh.
4. The fully biodegradable material according to claim 1, characterized in that said starch comprises: tapioca flour, sweet potato flour or potato flour.
5. An injection molding process of a full-biodegradable material is characterized by comprising the following steps:
s1, preheating the fully biodegradable material according to any one of claims 1 to 4 to 50-70 ℃;
s2, heating the preheated full-biodegradable material to the temperature of 120-150 ℃ to a molten state;
s3, injecting the full-biodegradable material in a molten state into a mold cavity, and keeping the pressure for a short time T1; after the product is injection molded, cooling the plastic mold, rapidly cooling the mold cavity from 140-160 ℃ to 10-15 ℃ in a short time T2 during injection molding, and demolding to obtain the product.
6. The injection molding process of the fully biodegradable material according to claim 5, wherein the short time T1 in step S3 is 50 ms.
7. The injection molding process of the fully biodegradable material as claimed in claim 5, wherein the short time T2 in step S3 is 1S.
8. The injection molding process of the fully biodegradable material according to claim 5, wherein all steps are performed using an injection molding machine.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202011596961.5A CN112778733A (en) | 2020-12-29 | 2020-12-29 | Full-biodegradable material and injection molding process thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011596961.5A CN112778733A (en) | 2020-12-29 | 2020-12-29 | Full-biodegradable material and injection molding process thereof |
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| CN112778733A true CN112778733A (en) | 2021-05-11 |
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| CN202011596961.5A Pending CN112778733A (en) | 2020-12-29 | 2020-12-29 | Full-biodegradable material and injection molding process thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112746515A (en) * | 2020-12-29 | 2021-05-04 | 琪恒泰新材料科技(深圳)有限公司 | Fully biodegradable material and paper laminating process thereof |
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| CN109834916A (en) * | 2017-11-24 | 2019-06-04 | 山东菏泽振华精密模具有限公司 | A kind of electric support Shooting Technique |
| CN110305456A (en) * | 2019-07-02 | 2019-10-08 | 汕头市雷氏塑化科技有限公司 | A kind of bamboo powder Biodegradable material and preparation method thereof |
| CN110343397A (en) * | 2019-07-02 | 2019-10-18 | 汕头市雷氏塑化科技有限公司 | A kind of bamboo powder full-biodegradable material and preparation method thereof |
-
2020
- 2020-12-29 CN CN202011596961.5A patent/CN112778733A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109834916A (en) * | 2017-11-24 | 2019-06-04 | 山东菏泽振华精密模具有限公司 | A kind of electric support Shooting Technique |
| CN110305456A (en) * | 2019-07-02 | 2019-10-08 | 汕头市雷氏塑化科技有限公司 | A kind of bamboo powder Biodegradable material and preparation method thereof |
| CN110343397A (en) * | 2019-07-02 | 2019-10-18 | 汕头市雷氏塑化科技有限公司 | A kind of bamboo powder full-biodegradable material and preparation method thereof |
Non-Patent Citations (1)
| Title |
|---|
| 文根保主编: "《复杂注塑模现代设计》", 31 July 2018, 金盾出版社 * |
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| CN112746515A (en) * | 2020-12-29 | 2021-05-04 | 琪恒泰新材料科技(深圳)有限公司 | Fully biodegradable material and paper laminating process thereof |
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