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Cross-linked TPU cast film and preparation method thereof

A cast film and crosslinking agent technology, applied in the field of crosslinked TPU cast film and its preparation, can solve the problems of small elongation at break, growth, limited tensile strength, etc., and achieve high tensile strength and deformation resistance ability, the effect of improving the service life

Inactive Publication Date: 2021-02-19
临沂京瑞新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the molten state or solution state, the intermolecular force weakens, and after cooling or solvent volatilization, strong intermolecular force connects together to restore the original solid performance. TPU has excellent properties such as high strength, high toughness, wear resistance, and oil resistance. Comprehensive performance, in the process of production and use of the current cast film, the tensile strength is limited, and the elongation at break is small, so there is an increasing demand for a cross-linked TPU cast film and its preparation method

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] The invention provides a technical solution:

[0027] A cross-linked TPU casting film and a preparation method thereof, comprising the preparation of an active cross-linking agent, the preparation of TPU granules and the preparation of a TPU casting film, wherein the TPU casting film base material is composed of TPU granules and active cross-linking Joint composition.

[0028] The active cross-linking agent is a polyurethane prepolymer, wherein the NCO content is 20% (percentage by weight), and the composition of the cross-linking agent is polymerized from polytetrahydrofuran diol and hydrogenated MDI.

[0029] The preparation of described reactive linking agent comprises the following steps:

[0030] Step 1: Add polytetrahydrofuran diol into the reaction kettle, raise the temperature to 110°C and vacuum dehydrate for 4 hours;

[0031] Step 2: Lower the temperature of the reactor to 60°C, add hydrogenated MDI, raise the temperature to 100°C, and keep it warm for 3 hou...

Embodiment 2

[0046] The invention provides a technical solution:

[0047] A cross-linked TPU casting film and a preparation method thereof, comprising the preparation of an active cross-linking agent, the preparation of TPU granules and the preparation of a TPU casting film, wherein the TPU casting film base material is composed of TPU granules and active cross-linking Joint composition.

[0048] The active cross-linking agent is polyurethane prepolymer, wherein the NCO content is 25% (weight percentage), and the cross-linking agent is composed of polytetrahydrofuran diol and hydrogenated MDI polymerized.

[0049] The preparation of described reactive linking agent comprises the following steps:

[0050] Step 1: Add polytetrahydrofuran diol into the reaction kettle, raise the temperature to 110°C and vacuum dehydrate for 4 hours;

[0051] Step 2: Lower the temperature of the reactor to 60°C, add hydrogenated MDI, raise the temperature to 100°C, and keep it warm for 3 hours;

[0052] Ste...

Embodiment 3

[0066] The invention provides a technical solution:

[0067] A cross-linked TPU casting film and a preparation method thereof, comprising the preparation of an active cross-linking agent, the preparation of TPU granules and the preparation of a TPU casting film, wherein the TPU casting film base material is composed of TPU granules and active cross-linking Joint composition.

[0068] The active cross-linking agent is a polyurethane prepolymer, wherein the NCO content is 30% (percentage by weight), and the composition of the cross-linking agent is polymerized from polytetrahydrofuran diol and hydrogenated MDI.

[0069] The preparation of described reactive linking agent comprises the following steps:

[0070] Step 1: Add polytetrahydrofuran diol into the reaction kettle, raise the temperature to 110°C and vacuum dehydrate for 4 hours;

[0071] Step 2: Lower the temperature of the reactor to 60°C, add hydrogenated MDI, raise the temperature to 100°C, and keep it warm for 3 hou...

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Abstract

The invention relates to the technical field of cast film preparation, and particularly relates to a cross-linked TPU cast film and a preparation method thereof. The preparation method includes preparation of an active cross-linking agent, preparation of TPU granules and preparation of the TPU cast film. A base material of the TPU cast film is composed of the TPU granules and the active cross-linking agent, the active cross-linking agent is a polyurethane prepolymer, the NCO content is 20-30%, the cross-linking agent is formed by polymerizing polytetrahydrofuran glycol and hydrogenated MDI, the hardness range of the TPU granules is 30-98 degrees, the tensile strength is greater than 10MPa, and the elongation at break is greater than 300%. The TPU cast film is prepared by the steps of firstly putting the active cross-linking agent and the TPU granules into a reaction device, then extruding the mixed material body through a double-screw extruder, drying the material body after being extruded to reduce the moisture content, adding the material body into casting equipment, and casting the material body into a film shape through the casting equipment. According to the invention, the TPUcast film has relatively high tensile strength and deformation resistance, and the service life of the cast film is prolonged.

Description

technical field [0001] The invention relates to the technical field of cast film preparation, in particular to a cross-linked TPU cast film and a preparation method thereof. Background technique [0002] Cast film is a non-stretched, non-oriented flat extrusion film produced by melt casting and quenching. There are two ways of single-layer salivation and multi-layer co-extrusion salivation. Compared with blown film, it is characterized by fast production speed, high output, excellent film transparency, gloss, thickness uniformity, etc. Thermoplastic polyurethane elastomer, also known as thermoplastic polyurethane rubber, referred to as TPU, is a kind of (AB ) n-type block linear polymer, A is a high molecular weight (1000~6000) polyester or polyether, B is a diol containing 2~12 straight chain carbon atoms, the chemical structure between the AB chain segments is diisocyanate, thermoplastic Polyurethane rubber is cross-linked by intermolecular hydrogen bonds or slightly cro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L75/06C08L75/08C08J5/18C08J3/24
CPCC08J5/18C08J3/246C08J2375/06C08J2475/08
Inventor 姜志国孙运强
Owner 临沂京瑞新材料科技有限公司