Waterproof moisture-permeable polyurethane film with environmental response function and preparation method thereof

Abstract

The invention provides a waterproof moisture-permeable polyurethane film with an environmental response function and a preparation method thereof. The waterproof moisture-permeable polyurethane film is prepared from the following raw materials in percentage by weight: 10-20% of polyhydroxypropyl methyl methacrylate, 15%-40% of diphenylmethane diisocyanate, 5%-10% of dihydric alcohol, and 45%-60% of polyethylene glycol. The preparation method comprises the following steps: mixing diphenylmethane diisocyanate and dihydric alcohol, and conducting reacting at a temperature of 75-85 DEG C for 1-2 hours; adding polyhydroxypropyl methyl methacrylate and polyethylene glycol, keeping the temperature at 75-85 DEG C, and conducting reacting for 3-4 hours; and carrying out blow molding / tape casting on the molten raw materials through a blow molding machine / tape casting machine to form a film. According to the invention, a multi-block structure of a hard segment, an environment induction zone and an amorphous zone is adopted; the amorphous zone is composed of a hydrophilic chain segment capable of moving freely, i.e., polyhydroxypropyl methyl methacrylate; the environment induction zone is composed of polyethylene glycol which is controlled by the environment and can prevent water molecules from passing through; and thus, the environment temperature response precision of the film is high, and the temperature response range of the film is wide.

Description

technical field [0001] The invention relates to the technical field of new materials, in particular to a waterproof and moisture-permeable polyurethane film with an environmental response function and a preparation method thereof. Background technique [0002] Waterproof and moisture-permeable fabric means that water does not soak into the fabric under a certain pressure, but the sweat emitted by the human body can be transmitted to the outside world through the fabric in the form of water vapor, so as to avoid sweat accumulation and condensation between the body surface and the fabric to keep the clothing comfortable It is a high-tech, unique functional fabric. In the prior art, technologies such as fabric and film lamination, coating, and high-density fabric are usually used to improve the waterproof and moisture-permeable performance of the fabric. However, the traditional film has poor waterproof and moisture permeability, and does not have the function of temperature s...

AI Technical Summary

Problems solved by technology

However, the traditional film has poor waterproof and moisture permeability, and does not have the function of temperature sensing; the coated fabric prevents a large amount of sweat from being discharged in the form of water vapor, and condensed water is formed inside the garment, which makes the human body feel uncomfortable such as stickiness and stuffiness, making it comfortable to wear Poor performance, and some thin-film coatings will cause certain environmental pollution due to the addition of solvents; although traditional thermotropic shape memory polymer materials have certain temperature responsiveness, the range of response to ambient temperature is too narrow and the response accuracy is not high. It is suitable for environments with large temperature differences; and its preparation cost is high, and its practicability is low. At the same time, because it needs to use a large amount of flammable and toxic organic solvents, it leads to low safety and great pollution to the environment.

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