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Preparation method of shape memory polyurethane coating solution

A polyurethane coating and polyurethane technology, applied in the field of polyurethane coating preparation, can solve problems such as wrinkles and wear, and achieve the effects of large adjustability, thin coating and good transparency

Active Publication Date: 2017-11-03
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to solve the problem that existing paper products are prone to wrinkle and wear during use, and to provide a method and application of shape-memory polyurethane coating

Method used

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  • Preparation method of shape memory polyurethane coating solution
  • Preparation method of shape memory polyurethane coating solution
  • Preparation method of shape memory polyurethane coating solution

Examples

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specific Embodiment approach 1

[0025] Specific embodiment one: the preparation method of the shape-memory polyurethane coating solution of this embodiment is implemented according to the following steps:

[0026] 1. Use DMF (N,N-dimethylformamide) Molecular sieves are dried to obtain dry DMF, and liquid PCL (polycaprolactone) is placed in a reaction vessel for vacuum dehydration, and then dry DMF and MDI (diphenylmethane diisocyanate) are added under the condition of argon protection, at 70 Stir and react at ~80°C for 1.5 to 2.5 hours to obtain a prepolymer;

[0027] 2. Add 1,4-BDO (1,4-butanediol) and dry DMF to the prepolymer obtained in step 1, and carry out chain extension reaction at a temperature of 70-80°C to obtain a compound with a solid content of 13 %~18% linear SMPU solution (linear shape memory polyurethane);

[0028] 3. Apply the linear SMPU solution evenly on a glass plate, place it in an oven at 70-100°C for 12-15 hours, and then place it at room temperature for 22-26 hours to obtain shap...

specific Embodiment approach 2

[0035] Embodiment 2: The difference between this embodiment and Embodiment 1 is that the liquid PCL described in step 1 is obtained by heating and melting solid PCL in a drying oven. Other steps and parameters are the same as those in Embodiment 1.

specific Embodiment approach 3

[0036] Embodiment 3: The difference between this embodiment and Embodiment 1 or 2 is that in Step 1, liquid PCL (polycaprolactone) is placed in a reaction vessel and dehydrated in a vacuum for 1 hour in a water bath at 120° C. Other steps and parameters are the same as those in Embodiment 1 or Embodiment 2.

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Abstract

The invention provides a preparation method and application of a shape memory polyurethane film laminating solution, belonging to the field of surface modification of materials. The objective of the invention is to overcome the problem that conventional paper products are prone to generation of creases and wearing during usage. The preparation method for the shape memory polyurethane film laminating solution comprises the following steps: 1, adding dry DMF and MDI into dehydrated PCL and carrying out a reaction at 70 to 80 DEG C so as to obtain a prepolymer; 2, adding 1,4-BDO and DMF into the prepolymer and carrying out a chain extension reaction at 70 to 80 DEG C so as to obtain a linear SMPU solution; 3, coating a glass plate with the linear SMPU solution and carrying out drying so as to obtain shape memory polyurethane; and 4, adding DMF so as to prepare the solution. A paper product is immersed into the shape memory polyurethane solution and then dried so as to obtain a laminated film. When a paper product coated with the film creases, the film is heated to a temperature higher than the glass-transition temperature of the polymer, so the paper product becomes smooth again.

Description

technical field [0001] The invention belongs to the field of material surface modification, and in particular relates to a preparation method and an application method of a polyurethane coating. Background technique [0002] Shape memory polymer refers to a product with an initial shape, which can be restored to its original shape after being stimulated by external conditions (such as heat, electricity, light, chemical induction, etc.) after changing its initial condition and fixing it under certain conditions. polymer materials. From the perspective of the microphase structure of the polymer, if the polymer has shape memory ability, it must contain a two-phase structure of "stationary phase" and "reversible phase". The "stationary phase" can keep the polymer in a fixed shape (original shape), "Reversible phase" is the reversible change of softening and hardening of the polymer with external conditions (such as temperature). Generally, after the shape memory polymer is mol...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08J3/11C08G18/76C08G18/66C08G18/42C08G18/10D21H17/57
CPCC08G18/10C08G18/4277C08G18/7671C08G2280/00C08J3/11C08J2375/06D21H17/57C08G18/3206
Inventor 冷劲松刘彦菊郑焓魏洪秋
Owner HARBIN INST OF TECH
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