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A kind of orientation strengthening method of thermoplastic resin

A thermoplastic resin and orientation technology, applied in the field of resin application, can solve problems such as small control range, complex equipment structure, and cumbersome molding process, and achieve the effects of improving mechanical properties, improving solvent resistance, and controlling costs

Active Publication Date: 2020-03-27
AVIC BEIJING INST OF AERONAUTICAL MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Patent CN106346767A discloses a method for preparing oriented polylactic acid profiles, which uses extrusion and forging to strengthen the orientation of polylactic acid profiles; patent CN105599314A discloses a continuous molding device for biaxially oriented polyvinyl chloride pipes and working method, the continuous forming device includes an outer mold, a core mold, a tube blank cooling system, and a double-orientation stretching forming system. The equipment used in the above-mentioned patent has a complex structure, a cumbersome forming process, and a small control range for the degree of material orientation, so , it is still important to explore orientation strengthening methods with a large controllable range and easy implementation

Method used

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  • A kind of orientation strengthening method of thermoplastic resin
  • A kind of orientation strengthening method of thermoplastic resin
  • A kind of orientation strengthening method of thermoplastic resin

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] The processing steps of preparing the orientation-strengthened thermoplastic resin blank are as follows:

[0025] (1) Put the pre-processed polymethyl methacrylate cylindrical blank 1 with a diameter of 20mm and a height of 30mm into a blast oven, and preheat at 130°C for 5h;

[0026] (2) Heating the reinforced mold to 130°C;

[0027] (3) The blank 1 after preheating is placed in the fixed template 2 of the strengthening mold, and the blank 1 is fixed with the positioning pin 3;

[0028] (4) Use a 2t press to press down on the movable template 4 at a rate of 50mm / min, and push the movable template 4 to move in horizontal and vertical directions at the same time until the height and thickness of the blank 1 become 10mm; realize the blank 1 Extrusion strengthening molding;

[0029] (5) Place the extruded billet in a blast oven, keep it warm at 110° C. for 3 hours, and then cool it down to room temperature naturally to obtain an orientation-strengthened polymethyl methac...

Embodiment 2

[0031] The processing steps of preparing the orientation-strengthened thermoplastic resin blank are as follows:

[0032] (1) Put the pre-processed polycarbonate cylindrical blank 1 with a diameter of 20mm and a height of 30mm into a blast oven, and preheat at 130°C for 5h;

[0033] (2) Heating the reinforced mold to 130°C;

[0034] (3) The blank 1 after preheating is placed in the fixed template 2 of the strengthening mold, and the blank 1 is fixed with the positioning pin 3;

[0035] (4) Use a 2t press to press down on the movable template 4 at a rate of 50 mm / min, and push the movable template 4 to move in horizontal and vertical directions at the same time until the height and thickness of the blank 1 become 10 mm; realize the blank 1 Extrusion strengthening molding;

[0036] (5) Place the extruded billet in a blast oven, keep it warm at 110° C. for 3 hours, and then cool it down to room temperature naturally to obtain an orientation-strengthened polycarbonate product.

Embodiment 3

[0038] The processing steps of preparing the orientation-strengthened thermoplastic resin blank are as follows:

[0039] (1) Put the pre-processed polymethyl methacrylate cylindrical blank 1 with a diameter of 20mm and a height of 30mm into a blast oven, and preheat at 130°C for 5h;

[0040] (2) Heating the reinforced mold to 130°C;

[0041] (3) The blank 1 after preheating is placed in the fixed template 2 of the strengthening mold, and the blank 1 is fixed with the positioning pin 3;

[0042] (4) Use a 2t press to press down on the movable template 4 at a rate of 100mm / min, and push the movable template 4 to move in horizontal and vertical directions at the same time until the height and thickness of the blank 1 become 10mm; realize the blank 1 Extrusion strengthening molding;

[0043] (5) Place the extruded billet in a blast oven, keep it warm at 110° C. for 3 hours, and then cool it down to room temperature naturally to obtain an orientation-strengthened polymethyl metha...

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Abstract

The invention discloses an orientation reinforcing method for thermoplastic resin. The method comprises the following orientation reinforcing steps: I, placing a blank (1) prepared by taking processedthermoplastic resin as a raw material into a blast drying oven, and heating completely at the temperature of 120 to 180 DEG C; II, heating a reinforcing mold to 60 to 140 DEG C, placing the blank (1)into the inner cavity of the reinforcing mold, placing a movable template (4) above the blank (1); placing a pressing plate (5) above the movable template (4), applying a load to the pressing plate (5) through a pressing machine to drive the movable template (4) to perform horizontal and vertical downward movement at the same time; III, down pressing the movable template (4) with the pressing machine at the speed of 5 to 300 mm / minute; IV, placing the extruded blank (1) into the blast drying oven again, after preserving heat at the temperature of 80 to 150 DEG C for 2 to 7 hours, and naturalcooling to room temperature. By adopting the method, the orientation of a molecular chain inside a polymer can be controlled directionally. An extracted part is subjected to subsequent thermal treatment, so that the internal residual stress can be effectively lowered; meanwhile, the orientation of the polymer molecular chain is kept, the mechanical performance and solvent resistance of the productare improved, and the reinforcing effect is achieved.

Description

technical field [0001] The invention relates to an orientation strengthening method of thermoplastic resin, which belongs to the technical field of resin application. Background technique [0002] When the thermoplastic resin is stretched or sheared during the molding process, the molecular chain orientation of the resin will appear. Orientation has a great influence on the performance of the resin, and can greatly improve its mechanical properties such as tensile strength, impact strength, and elongation at break in a specific direction, while accompanied by changes in thermal and optical properties. In order to obtain higher strength products, the orientation control of materials has become an important link in plastic processing. There are two main ways of molecular chain orientation of resins. One is uniaxial orientation, that is, structural units such as molecular chains or segments are arranged along the direction of force under a certain direction of force. This orie...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B29C51/42B29C71/02
CPCB29C51/42B29C71/02
Inventor 王韬王博伦颜悦葛勇相宁
Owner AVIC BEIJING INST OF AERONAUTICAL MATERIALS