Optically thermoplastic polyurethane elastomer and preparation method thereof

Abstract

The invention belongs to the technical field of optical polyurethane elastomers used for composite structure safe glass, and relates to an optically thermoplastic polyurethane elastomer and a preparation method thereof. The elastomer comprises the following components in parts by weight: 60.00% to 80.00% of polyether glycol, 3.00% to 8.00% of a polyhydric alcohol micromolecular chain extender, 10%to 30% of aliphatic diisocyanate, 0.01% to 0.05% of an organic tin catalyst, 0.50% to 1.50% of an oil-solubility antioxidant and 1.00% to 2.00% of a light stabilizer, wherein polytetrahydrofuran withthe molecular weight of 600 to 2000 is selected as the polyether glycol. The polyurethane elastomer material is synthesized and prepared by using a two-step method of a reaction kettle, after the synthesized polyurethane material is pelletized and heated for curing, optical polyurethane elastomer films with different thicknesses can be prepared through the method such as direct flat plate pouringor extrusion pelletizing and then injection forming and extrusion forming. The optically thermoplastic polyurethane elastomer has a high mechanical property, optical performance and tearing strength;the tensile strength is 30 to 45 MPa, the elongation at break is 400% to 700%, the tearing strength is 30 to 50 KN / m, and the light transmittance after being compounded with 2 mm glass is 85% to 87%.

Description

technical field [0001] The invention belongs to the technical field of optical grade polyurethane elastomer for safety glass with composite structure, and relates to an optical grade thermoplastic polyurethane elastomer and a preparation method thereof. Background technique [0002] Composite structural safety glass, also known as laminated glass, is composed of two or more pieces of inorganic or organic glass bonded together by one or more layers of interlayer film. Composite structural safety glass is widely used in many fields such as architectural glass, automobile windshield glass, transparent parts of aviation structure and high-speed rail glass due to its excellent impact resistance. The interlayer film or film plays multiple functions such as bonding, energy absorption, buffering, and preventing glass fragments from splashing after impact in composite structural safety glass or laminated glass, and has become one of the key materials widely used in the field of compo...

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Problems solved by technology

[0003] PVB is an early film material used in the middle layer of safety glass, and is still widely used in architectural glass, curtain wall glass, automotive glass and other fields, but when the temperature is low (such as below zero), PVB film shows brittleness , will greatly weaken the bonding strength with organic transparent materials and inorganic glass

Moreover, the bonding performance of PVB film to plexiglass and polycarbonate (PC) is very poor, and the plasticizer in the PVB bulk phase easily erodes the surface of the PC board, and the long-term action makes the surface of the PC board foggy; and DuPont's SGP ion The type interlayer film can significantly improve the overall bending strength and impact performance of safety glass due to its high hardness, but due to its high hardness and a large difference in thermal expansion coefficient from inorganic glass, it is suitable for use in the field of curved glass and in high and low temperature environments. The application is limited; and thermoplastic polyurethane elastomer film has become a hot spot in the field of safety glass research and application due to its good environmental resistance, good bonding performance with organic and inorganic glass, and low temperature flexibility.

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