Unlock instant, AI-driven research and patent intelligence for your innovation.

A kind of injection molding method of ultra-large size polymer glass

An injection molding, super-sized technology, which is applied in glass production, household utensils, optical components, etc., can solve the problems of reducing parts, limited thermal stress removal effect, and inability to relax molecular chains, so as to achieve simple process flow and optimized melt Effect of flow state, low stress level

Active Publication Date: 2022-05-17
AVIC BEIJING INST OF AERONAUTICAL MATERIALS
View PDF17 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

A large number of repeated tests have shown that the internal stress of the part can be reduced by post-annealing. Even if the annealing time is prolonged, only a part of the orientation stress can be reduced by molecular chain relaxation, and the effect on removing thermal stress is limited, because after the product is demoulded and cooled, Its molecular chains have been completely frozen, even if the temperature is raised and annealed again, the molecular chains cannot be completely relaxed

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • A kind of injection molding method of ultra-large size polymer glass
  • A kind of injection molding method of ultra-large size polymer glass
  • A kind of injection molding method of ultra-large size polymer glass

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Taking L×W×T=2500×1200×20mm ultra-large size, thick-walled, equal-thickness polymethyl methacrylate optical plate as an example, the specific molding steps are as follows:

[0039] Step 1. Partition heating of the mold surface: The polymer glass is a flat plate of equal thickness, and the cavity gap of the entire mold is the same. The entire mold surface is divided into the same area, and the entire mold surface is heated by means of an electric heating wire. The temperature is heated to about 150 ℃, which is higher than the glass transition temperature of polymethyl methacrylate; (attached figure 1in step A)

[0040] Step 2, low-speed, low-pressure filling: plasticized and melted polymethyl methacrylate melt at 245 ° C at an injection speed of 1 / 150 injection volume per second and 15 MPa; (attached; figure 1 in step B)

[0041] Step 3. In-situ annealing in the mold: keep the surface temperature of the mold unchanged at about 150 °C, and let the polymethyl methacrylat...

Embodiment 2

[0044] With a thickness of 14-30mm and a surface area of ​​1m 2 Taking the left and right super-sized and variable-thickness polycarbonate curved optical parts as an example, the specific molding steps are as follows:

[0045] Step 1. Partition heating of the mold surface: the polymer glass is a 14-30mm variable thickness flat plate, and the cavity gap of the entire mold is different, and the entire mold surface is divided into 4 areas (attached). figure 2 ), 14-18 mm in zone I, 18-22 mm in zone II, 22-26 mm in zone III, and 26-30 mm in zone IV. The mold surfaces of the four zones are independently heated and heated by means of electric heating wires. The temperature of the mold surface in zone I is heated to 160 °C, the temperature of the mold surface in zone II is heated to 170 °C, and the temperature of the mold surface in zone III is heated to 180 °C , the temperature of the mold surface in the IV zone is heated to 190 ° C, which is higher than the glass transition tempe...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
thicknessaaaaaaaaaa
thicknessaaaaaaaaaa
transmittivityaaaaaaaaaa
Login to View More

Abstract

The invention relates to an injection molding method of super-large-sized polymer glass. In the method, the polymer glass melt is injected into a high-temperature mold with surface zone temperature control at a relatively low injection speed and injection pressure, and then an in-mold heat preservation and annealing treatment is carried out. Significantly reduce the shear heat of the melt and the orientation of the molecular chain during the injection process to ensure the quality of the melt and low flow stress; at the same time, the method adopts a gradient cooling method in the cooling and setting stage to prevent the traditional rapid cooling from causing the product to be damaged. Uneven shrinkage and higher thermal stress appear in different thickness regions. This method not only overcomes the problems of large internal stress, uneven shrinkage and optical distortion in the rapid cooling and rapid heating injection molding method, but also solves the problems of low internal stress removal and long time in the traditional heat treatment method. The invention realizes the low stress, high optics, short cycle and high-efficiency molding and manufacturing of super-large-sized polymer glass, and has irreplaceable advantages and wide applications in the manufacture of transparent products with structural characteristics such as super-large size, super-large weight, and thick walls. prospect.

Description

technical field [0001] The invention relates to an injection molding method of super-large-sized polymer glass, which belongs to the technical field of glass molding and manufacturing. Background technique [0002] The application fields of super-large polymer glass are becoming more and more extensive, from traditional automotive glass and ordinary train glass, to windshield glass of advanced transportation systems such as aircraft and high-speed trains, and to super-thick observation window glass of deep-sea exploration submersibles Wait. Injection molding technology can form products with complex shapes and precise dimensions at one time, and the molding process is highly automated. It is widely used in polymer glass molding, but it is mostly limited to medium and small size glass parts, such as automotive glass, guide Light plates, lenses, etc. When conventional injection molding technology manufactures thick-walled polymer parts with large size, high surface quality, ...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): B29C45/00B29C45/03B29C45/78B29C45/73B29C71/02B29L11/00
CPCB29C45/0053B29C45/03B29C45/78B29C45/7312B29C45/73B29C71/02B29C2071/022B29L2011/00Y02P40/57
Inventor 葛勇郎建林王韬孙琦伟颜悦
Owner AVIC BEIJING INST OF AERONAUTICAL MATERIALS