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Three-layer co-extruded composite film specially used for invisible correction and preparation method of composite film

A technology of three-layer co-extrusion and composite membrane, which is applied in the direction of chemical instruments and methods, layered products, synthetic resin layered products, etc., can solve the problems of poor material elasticity, low tear strength, low tensile strength, etc. Achieve the effect of improving elasticity and tear resistance, improving elasticity and tearing performance, and high biological safety

Inactive Publication Date: 2018-08-14
SUZHOU POLLY NEW MATERIAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the problem with the two is that the polymer materials produced do not have enough elastic recovery force, so that the stress generated during the orthodontic process is not enough, resulting in poor orthodontic effect
However, when the amount of TPU is less than 20%, the transparency can be guaranteed. Due to the requirement of transparency, the amount of TPU is less, so the elasticity of the material is poor
In addition, the injection molding process requires good fluidity of the material, so the overall strength of the sheet of the blend system is low, the rebound is poor, and the invisible correction effect is poor
[0004] In summary, although there are invisible orthodontic diaphragms in the prior art, these diaphragms have poor transparency, low tensile strength, poor toughness and elasticity, and low tear strength, and the therapeutic effect of the invisible aligner is not enough. ideal

Method used

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  • Three-layer co-extruded composite film specially used for invisible correction and preparation method of composite film
  • Three-layer co-extruded composite film specially used for invisible correction and preparation method of composite film

Examples

Experimental program
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Effect test

Embodiment 1

[0016] This embodiment provides a special three-layer co-extruded composite diaphragm for invisible correction, which has a three-layer structure, the surface layer A is DP9873D TPU of German Covestro (Bayer) company with a thickness of 0.25 mm and a hardness of 73D, and the middle layer is 0.3 mm thick. German Covestro (Bayer) company Makrolon 3108PC, the inner layer C is Elastollan 1195A TPU of German BASF company (BASF) with a thickness of 0.2 mm and a hardness of 95A.

[0017] The preparation process of the three-layer co-extruded composite membrane for invisible correction is as follows: figure 2 As shown, the details are as follows:

[0018] (a) Drying: Dry Elastollan 1195A TPU at 110°C for 3 hours, dry Makrolon 3108PC at 130°C for 4 hours, and dry DP9873D TPU at 120°C for 3 hours;

[0019] (b) Extrusion: Add the dried Elastollan 1195A TPU, Makrolon 3108PC, and DP9873D TPU to three twin-screw extruders and extrude at the specified temperature. The processing temperatu...

Embodiment 2

[0025] This embodiment provides a special three-layer co-extruded composite diaphragm for invisible correction, which has a three-layer structure, the surface layer A is DP9873D TPU of German Covestro (Bayer) company with a thickness of 0.15 mm and a hardness of 73D, and the middle layer B is a thickness of 0.5 mm. The German Covestro (Bayer) company Makrolon 3108PC, the inner layer C is the Elastollan 1195A TPU of the German BASF company (BASF) with a thickness of 0.1mm and a hardness of 95A.

[0026] The preparation process of the three-layer co-extruded composite membrane for invisible correction is as follows: figure 2 As shown, the details are as follows:

[0027] (a) Dry Elastollan 1195A TPU at 110°C for 3 hours, dry Makrolon3108PC at 130°C for 4 hours, and dry DP9873D TPU at 120°C for 3 hours;

[0028] (b) Extrusion: Add the dried Elastollan 1195A TPU, Makrolon 3108PC, and DP9873D TPU to three twin-screw extruders and extrude at the specified temperature. The process...

Embodiment 3

[0034] This embodiment provides a special three-layer co-extruded composite membrane for invisible correction, which has a three-layer structure, the thickness of the surface layer A is DP9873D TPU of German Covestro (Bayer) company with a hardness of 73D, and the thickness of the middle layer B is 0.3mm. Makrolon 3108PC of Covestro (Bayer) Co., Ltd. of Germany, and the inner layer C is Elastollan 1195A TPU of BASF Co., Ltd. of Germany with a thickness of 0.3mm and a hardness of 95A.

[0035] The preparation process of the three-layer co-extruded composite membrane for invisible correction is as follows: figure 2 As shown, the details are as follows:

[0036] (a) Dry Elastollan 1195A TPU at 110°C for 3 hours, dry Makrolon 3108PC at 130°C for 4 hours, and dry DP9873D TPU at 120°C for 3 hours;

[0037] (b) Extrusion: Add the dried Elastollan 1195A TPU, Makrolon 3108PC, and DP9873D TPU to three twin-screw extruders and extrude at the specified temperature. The processing tempe...

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Abstract

The invention relates to a three-layer co-extruded composite film specially used for invisible correction and a preparation method of the composite film. The composite film is divided into three layers from material components, wherein a first layer is a surface layer A and is a rigid transparent thermoplastic polyurethane (TPU) layer with a Shore hardness of 60D-90D, a second layer is a middle layer B and is a transparent polycarbonate (PC) layer, and a third layer is an inner layer C and is a flexible transparent thermoplastic polyurethane (TPU) layer with a Shore hardness of 55A-55D; and the total thickness of the three-layer co-extruded composite film is 0.15-2.0 mm, wherein the thickness of the surface layer A is 0.05-0.5 mm, the thickness of the middle layer B is 0.05-1.0 mm, and thethickness of the inner layer C is 0.05-0.5 mm. The method provided by the invention adopts the three-layer co-extrusion technology, and the prepared film specially used for the invisible correction has a high comfort degree, good transparency, high strength and a good correcting effect.

Description

technical field [0001] The invention belongs to the field of tooth invisible orthodontic materials, and in particular relates to a three-layer co-extruded composite membrane specially used for invisible orthodontics and a preparation method thereof. Background technique [0002] Orthodontics is the treatment of malocclusion through orthodontics or surgery. Malocclusion refers to the deformity of teeth, jaws and craniofacial, malocclusion and dental caries caused by congenital or acquired factors during the growth and development of children. Periodontal disease and periodontal disease are listed as the three common diseases of the oral cavity together, and its prevalence rate is as high as more than 50% of the population. Traditional orthodontics is to bond small metal pieces called "brackets" on the teeth, and then ligate the orthodontic archwires to make the teeth move, so as to achieve the purpose of orthodontics. This kind of wire bracket appliance often leaves people w...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B32B27/08B32B27/40B32B27/36A61L31/14A61L31/12A61L31/06
CPCA61L31/06A61L31/14B32B27/08B32B27/365B32B27/40C08L75/04C08L69/00
Inventor 王文斌
Owner SUZHOU POLLY NEW MATERIAL TECH CO LTD
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