Modified terminal hydroxyl polybutadiene liquid rubber light-heat dually-cured material and preparation method thereof

Abstract

The invention relates to a preparation method of a modified terminal hydroxyl polybutadiene liquid rubber light-heat dually-cured material. The preparation method comprises following steps: at first,placing acryloyl chloride modified terminal hydroxyl polybutadiene liquid rubber in vacuum to remove bubbles and micromolecular impurities in the system; then adding a filling material, a photo initiator, and a heat initiator, evenly mixing to obtain liquid cement, painting the liquid cement on a die, and carrying out UV curing and heat curing in sequence to prepare the light-heat dually-cured rubber material. At first, light curing is carried out to rapidly convert liquid cement into a solid film, the UV rays are utilized to trigger chain reactions to synthesize polymers, then UV cured rubberis thermally cured, the rubber is more completely cured, the molecular chains are more tightly bonded, and the comprehensive performance of the rubber material is strengthened. The prepared light-heat dually-cured rubber material has excellent mechanical properties, heatproof property, waterproof property, and acid corrosion resistant property.

Description

technical field [0001] The invention belongs to the technical field of materials, and in particular relates to a modified hydroxyl-terminated polybutadiene liquid rubber photothermal dual curing material and a preparation method thereof. Background technique [0002] Liquid rubber is a low molecular weight prepolymer, and liquid rubber exhibits good fluidity at room temperature. Therefore, there is no need to add any solvent when using liquid rubber to make products, which has the advantages of safety and environmental protection. Liquid rubber is suitable for pouring molding process. The process flow is simple, easy to operate, and convenient for continuous mechanical automatic production. This advantage provides conditions for the wide application of liquid rubber. Products made of liquid rubber are widely used in military, aerospace, scientific research, automobile, construction, medical and other fields. [0003] At present, the liquid rubber containing photosensitive ...

AI Technical Summary

Problems solved by technology

[0003] At present, the liquid rubber containing photosensitive groups obtained through chemical modification has the ability of rapid photocuring under ultraviolet radiation, but when making thick products through 3D printing, ultraviolet light cannot be irradiated deep into the product, resulting in defects between layers , products with excellent mechanical properties and mechanical properties cannot be obtained

Some researchers used acrylic-based photosensitive resin for UV curing, and bisphenol A diglycidyl ether and fatty acid anhydride were thermally cured at 150°C. The printed dual-curing polymer composite material has a relatively high tensile strength, but the photothermal dual-curing material in the above method is light-cured and thermally cured by two different resins, which has complex process procedures and poor composite effects. The problem