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Preparation method of high-strength polyurethane-based composite film

A composite film and polyurethane technology, applied in chemical instruments and methods, lamination, coating, etc., can solve the problems of uneven mixing of two phases, limited force between layers, and inability to adjust the number of continuous deposition layers, etc., to achieve The effect of structural controllability

Inactive Publication Date: 2016-02-03
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The present invention aims to solve the problem that the existing traditional solvent casting method for preparing polyurethane-based composite materials has uneven mixing of two phases, and the reinforcing agent has no obvious effect on improving the mechanical properties of polyurethane-based composite materials, and the materials prepared by the traditional layer-by-layer self-assembly method The structure is single, the manufacturability is poor, the number of continuous deposition layers of each substance cannot be adjusted, and the force between layers is limited, and the problem of lack of curing technology is provided. A method for preparing a high-strength polyurethane-based composite film is provided

Method used

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  • Preparation method of high-strength polyurethane-based composite film
  • Preparation method of high-strength polyurethane-based composite film
  • Preparation method of high-strength polyurethane-based composite film

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specific Embodiment approach 1

[0030] Embodiment 1: The preparation method of a high-strength polyurethane-based composite film described in this embodiment is specifically carried out according to the following steps:

[0031] 1. Preparation of Kevlar nanofiber solution: Cut Kevlar fiber into pieces and dry to obtain Kevlar fiber with a length of 2cm to 5cm, add sodium hydroxide and Kevlar fiber with a length of 2cm to 5cm In an autoclave equipped with a dimethyl sulfoxide solution, and then place the autoclave at a temperature of 120°C to 150°C to react for 3 days to 5 days to obtain a Kevlar nanofiber solution;

[0032] The mass ratio of the Kevlar fiber to sodium hydroxide is 1:(1~3); the volume ratio of the quality of the Kevlar fiber to the dimethyl sulfoxide solution is 1g:(400~600) mL;

[0033] 2. Preparation of a mixed solution containing polyurethane: Dissolve polyurethane in ethyl acetate solution, then add 1-hydroxycyclohexyl phenyl ketone to obtain a mixed solution, stir the mixed solution mag...

specific Embodiment approach 2

[0051] Embodiment 2: The difference between this embodiment and Embodiment 1 is that the negatively charged glass sheet described in step 3 is specifically prepared according to the following steps: the glass substrate is placed in ethanol and ultrasonicated for 20min to 30min to obtain The glass substrate after ultrasonic treatment, then immerse the glass substrate after ultrasonic treatment in the treatment liquid, treat for 2h to 3h, and rinse it with deionized water after treatment to obtain a negatively charged glass sheet; the treatment liquid is prepared by It is obtained by mixing concentrated sulfuric acid with a mass percentage of 98% and hydrogen peroxide with a mass percentage of 30%, and the mass ratio of the concentrated sulfuric acid to hydrogen peroxide is 3:1. Others are the same as in the first embodiment.

specific Embodiment approach 3

[0052] Embodiment 3: This embodiment is different from Embodiment 1 or Embodiment 2 in that: the mass ratio of Kevlar fiber to sodium hydroxide described in step 1 is 1:2. Others are the same as in the first or second embodiment.

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Abstract

The invention provides a preparation method of a high-strength polyurethane-based composite film, and the invention relates to a preparation method of the composite film. The invention solves the problems that the polyurethane-based composite material prepared by a present traditional solvent casting method has nonuniformly mixed two phases, a mechanical property improving effect of the polyurethane-based composite material due to a reinforcing agent is not obvious, the material prepared by a traditional layer upon layer self-assembly method has a single structure and bad manufacturability, continuous sedimentary deposition layer number of each substance cannot be adjusted, active forces between layers are limited, and solidification technology is lacked. The method comprises the following steps: 1, preparation of a Kevlar nanometer fiber solution; 2. preparation of a mixed solution containing polyurethane; 3. coverage with a film on a matrix surface; 4, treatment of a composite film by a stacking and hot-pressing method. The method is used for preparing the high-strength polyurethane-based composite film.

Description

technical field [0001] The invention relates to a preparation method of a composite film. Background technique [0002] Polyurethane stands out in the field of composite materials because of its good toughness, excellent impact resistance, oil resistance and abrasion resistance. The traditional solvent casting method to prepare polyurethane-based composites has problems such as uneven mixing of the two phases and weak bonding between substances. It shows that the effect of reinforcing agent on improving the mechanical properties of polyurethane-based composites is not obvious. [0003] As a high-performance aramid fiber material, Kevlar has outstanding mechanical properties such as high strength and high modulus. The newly synthesized Kevlar nanofibers in 2010 inherited the excellent properties of macroscopic fibers, and there are a large number of hydrogen bonds and conjugation between molecules, which are very easy to attract each other with other molecules, showing pote...

Claims

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Application Information

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IPC IPC(8): B32B17/06B32B37/06B32B37/10C08J7/04
CPCB32B17/06B32B37/06B32B37/10B32B2255/00B32B2255/26C08J7/042C08J2339/00C08J2475/04C08J2477/10
Inventor 杨明齐小东邝青霞曹文鑫岳明丽侯莹
Owner HARBIN INST OF TECH
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