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Waterproof TPU thin film and preparation method thereof

A film and intermediate layer technology, applied in chemical instruments and methods, flat products, and other household appliances, etc., can solve the problems of increasing product thickness, affecting moisture permeability and hand comfort, etc., to meet the water blocking function and strong waterproof Performance and barrier performance, good moisture permeability

Inactive Publication Date: 2015-12-02
GUANGZHOU YUXIN NEW MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in order to achieve the functions of effectively waterproofing and blocking the spread of bacteria, the existing products of this type will increase the thickness of the product, affecting moisture permeability and hand comfort

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] A waterproof TPU film is composed of three layers of microporous films: an outer layer, a middle layer and an inner surface layer. The middle layer is a microporous film composed of polytetrafluoroethylene and thermoplastic polyurethane. Both the outer surface layer and the inner surface layer are polyether thermoplastic polyurethane microporous films. The weight-average molecular weight of the thermoplastic polyurethane in the middle layer is (5~10)×10 5 , the number-average molecular weight of polytetrafluoroethylene is less than 600,000; the weight-average molecular weight of polyether thermoplastic polyurethane on the outer and inner layers is (20-30)×10 5 . Wherein, the weight of polytetrafluoroethylene in the middle layer is 70% of the weight of the middle layer. The ratio of the weight of the middle layer to the weight of the outer layer is 0.5:1.

[0024] The above-mentioned waterproof TPU film is made by the following steps:

[0025] (1) Preparation of out...

Embodiment 2

[0032] A waterproof TPU film is composed of three layers of microporous films: an outer layer, a middle layer and an inner surface layer. The middle layer is a microporous film composed of polytetrafluoroethylene and thermoplastic polyurethane. Both the outer surface layer and the inner surface layer are polyether thermoplastic polyurethane microporous films. The weight-average molecular weight of the thermoplastic polyurethane in the middle layer is (5~10)×10 5 , the number-average molecular weight of polytetrafluoroethylene is less than 600,000; the weight-average molecular weight of polyether thermoplastic polyurethane on the outer and inner layers is (20-30)×10 5 . Wherein, the weight of polytetrafluoroethylene in the middle layer is 80% of the weight of the middle layer. The ratio of the weight of the middle layer to the weight of the outer layer is 1:1.

[0033] The above-mentioned waterproof TPU film is made by the following steps:

[0034] (1) Preparation of outer...

Embodiment 3

[0041] A waterproof TPU film is composed of three layers of microporous films: an outer layer, a middle layer and an inner surface layer. The middle layer is a microporous film composed of polytetrafluoroethylene and thermoplastic polyurethane. Both the outer surface layer and the inner surface layer are polyether thermoplastic polyurethane microporous films. The weight-average molecular weight of the thermoplastic polyurethane in the middle layer is (5~10)×10 5 , the number-average molecular weight of polytetrafluoroethylene is less than 600,000; the weight-average molecular weight of polyether thermoplastic polyurethane on the outer and inner layers is (20-30)×10 5. Wherein, the weight of polytetrafluoroethylene in the middle layer is 75% of the weight of the middle layer. The ratio of the weight of the middle layer to the weight of the outer layer is 0.8:1.

[0042] The above-mentioned waterproof TPU film is made by the following steps:

[0043] (1) Preparation of oute...

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Abstract

The invention discloses a waterproof TPU thin film. The water proof TPU thin film is composed of microporous thin film bodies of an outer surface layer, a middle layer and an inner surface layer which are compounded into a whole; the middle layer is the microporous thin film body which is prepared from polytetrafluoroethylene and thermoplastic polyurethane, and the outer surface layer and the inner surface layer are both polyether hermoplastic polyurethane microporous thin film bodies; the weight-average molecular weight of the thermoplastic polyurethane of the middle layer is (5-10)*105, and the number-average molecular weight of polytetrafluoroethylene of the middle layer is less than 600 thousand; the weight-average molecular weight of the polyether hermoplastic polyurethane of the outer surface layer and the inner surface layer is (20-30)*105. The invention further discloses a preparation method of the waterproof TPU think film. Compared with the prior art, the waterproof TPU thin film has a strong water proof property, barrier property and good moisture penetrability and is comfortable in hand feeling.

Description

technical field [0001] The invention relates to the technical field of TPU products, in particular to a waterproof TPU film and a preparation method thereof. The waterproof TPU film is suitable for making waterproof products, such as waterproof gloves and waterproof keyboard covers. Background technique [0002] Thermoplastic polyacid (TPU) is a kind of high polymer prepared from oligomer polyol, polyisocyanate and chain extender as the main raw materials. It plays an increasingly important role in industrial and agricultural production and develops rapidly. [0003] The sub-chain of TPU is generally composed of a hard segment and a soft segment. The soft segment is generally polyether, polyester and polyolefin with terminal hydroxyl groups, and the hard segment is generally formed by a chain extender (such as a linear short-chain diol) and isocyanate. Polyurethane (or polyurea). Due to its excellent wear resistance, high tensile strength and elongation, TPU also has low co...

Claims

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Application Information

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IPC IPC(8): B32B27/08B32B27/30B32B27/40B32B3/24B29D7/01
CPCB32B27/08B29D7/01B29D2009/00B29K2105/041B32B3/266B32B27/304B32B27/40B32B2250/03B32B2250/24B32B2305/026B32B2307/724B32B2307/7265B32B2327/18B32B2375/00B32B2437/02B32B2457/00
Inventor 徐咏春
Owner GUANGZHOU YUXIN NEW MATERIAL CO LTD
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