Injection molding method for fabricating transparent device

Patent metadata

Field	Value
Publication number	US-11820045-B2
Application number	US-201816488597-A
Country	US
Kind code	B2
Filing date	Dec 3, 2018
Priority date	Dec 4, 2017
Publication date	Nov 21, 2023
Grant date	Nov 21, 2023

Abstract

The present disclosure discloses an injection molding method for fabricating a transparent device, and belongs to the technical field of material processing. The method comprises: preparing a nano-microsphere structural polymer material from a long-chain polymer material; obtaining a glass transition temperature and a viscous flow transition temperature of the nano-microsphere structural polymer material; obtaining a processing temperature of the nano-microsphere structural polymer material according to the glass transition temperature and the viscous flow transition temperature; drying the nano-microsphere structural polymer material; plasticizing the dried nano-microsphere structural polymer material according to the processing temperature; filling the plasticized nano-microsphere structural polymer material; cooling the filled nano-microsphere structural polymer material; and demolding the cooled nano-microsphere structural polymer material to form a transparent device. With the present disclosure, the technical effect that the fabricated device has high precision and no oriented optical distortion and strain birefringence is achieved.

First claim

What is claimed is:

1. An injection molding method for fabricating a transparent device, wherein the injection molding method for fabricating the transparent device comprises:
preparing a nano-microsphere structural polymer material from a polymer material;
obtaining a glass transition temperature and a viscous flow transition temperature of the nano-microsphere structural polymer material;
obtaining a processing temperature of the nano-microsphere structural polymer material according to the glass transition temperature and the viscous flow transition temperature;
subjecting the nano-microsphere structural polymer material to freeze drying or spray drying;
plasticizing the dried nano-microsphere structural polymer material according to the processing temperature;
filling the plasticized nano-microsphere structural polymer material;
cooling the filled nano-microsphere structural polymer material; and
demolding the cooled nano-microsphere structural polymer material to form the transparent device.

2. The injection molding method for fabricating the transparent device according to claim 1 , wherein the step of preparing the nano-microsphere structural polymer material from the polymer material comprises:
preparing a non-oriented nano-microsphere structural polymer material from the polymer material by in-situ polymerization.

3. The injection molding method for fabricating the transparent device according to claim 2 , wherein the step of obtaining the glass transition temperature and the viscous flow transition temperature of the nano-microsphere structural polymer material comprises:
obtaining the glass transition temperature and the viscous flow transition temperature of the nano-microsphere structural polymer material by differential scanning calorimetry.

4. The injection molding method for fabricating the transparent device according to claim 3 , wherein the processing temperature of the nano-microsphere structural polymer material obtained according to the glass transition temperature and the viscous flow transition temperature the processing temperature is larger than or equal to the glass transition temperature.

5. The injection molding method for fabricating the transparent device according to claim 4 , characterized in that:
the processing temperature is less than or equal to the viscous flow transition temperature.

6. The injection molding method for fabricating the transparent device according to claim 5 , wherein the step of subjecting the nano-microsphere structural polymer material to freeze drying or spray drying comprises:
loading the nano-microsphere structural polymer material into a hopper, and subjecting the nano-microsphere structural polymer material loaded into the hopper to freeze drying or spray drying.

7. The injection molding method for fabricating the transparent device according to claim 6 , wherein the step of plasticizing the dried nano-microsphere structural polymer material according to the processing temperature comprises:
clamping the nano-microsphere structural polymer material loaded into the hopper; and
plasticizing the clamped nano-microsphere structural polymer material.

8. The injection molding method for fabricating the transparent device according to claim 7 , wherein the step of filling the plasticized nano-microsphere structural polymer material comprises:
loading the plasticized nano-microsphere structural polymer material into a filling cavity, so that the filling cavity has a filling range of 80% to 90%;
subjecting the nano-microsphere structural polymer material loaded into the filling cavity to pressure holding to fill the filling cavity to 100%.

9. The injection molding method for fabricating the transparent device according to claim 8 , wherein the step of cooling the filled nano-microsphere structural polymer material comprises:
cooling the filled nano-microsphere structural polymer material according to a standard temperature,
wherein the standard temperature is greater than or equal to 30° C., and the standard temperature is less than or equal to the glass transition temperature.

10. The injection molding method for fabricating the transparent device according to claim 9 , characterized in that:
the polymer material is a non-crystalline polymer material, including polymethyl methacrylate, polycarbonate or polystyrene; and
the nano-microsphere structural polymer material is the non-crystalline polymer material with nano-sized microsphere structure, including polymethyl methacrylate, polycarbonate or polystyrene.

Assignees

• Univ Huazhong Science Tech

Inventors

• Wang Yunming
• Zhou Huamin
• Zhang Yun
• Huang Zhigao
• Li Dequn
• Chen Dan
• Fu Yue

Classifications

• B29B13/045 Primary

  of powders or pellets · CPC title

• B29B13/065 Primary

  of powder or pellets · CPC title

• B29C45/0001

  characterised by the choice of material · CPC title

• B29K2025/06

  PS, i.e. polystyrene · CPC title

• B29K2033/12

  Polymers of methacrylic acid esters, e.g. PMMA, i.e. polymethylmethacrylate · CPC title