Humidity and heat resistant water sensitive resin and humidity and heat resistant polymer resistance type humidity sensitive film and preparation methods thereof

Abstract

The invention belongs to the field of material chemistry, and relates to humidity and heat resistant water sensitive resin and a humidity and heat resistant polymer resistance type humidity sensitive film and preparation methods thereof. Humidity and heat resistant water sensitive resin is prepared by the following steps of: performing first-step reaction on methacrylate monomers and a double bond-containing silane coupling agent in an initiator-containing solvent system and adding bromo alkane for second-step reaction; and after the second-step reaction is finished, washing a product by using ether, and drying. The humidity and heat resistant polymer resistance type humidity sensitive film is prepared by the following steps of: preparing humidity and heat resistant water sensitive resin, a solvent and a crosslinking agent into a humidity sensitive solution; and dip-coating electrodes, and baking. The preparation methods are simple and low in cost; and the prepared humidity sensitive film has wider response range, higher response sensitivity, small hysteresis, quick response, and excellent humidity and wet resistance, and can be widely applied to accurate measurement and control of humidity.

Description

technical field [0001] The invention belongs to the field of material chemistry, and relates to a heat-resistant humidity-sensitive resin, a resistance-type humidity-sensitive film of a heat-resistant high molecular weight and a preparation method thereof. The humidity-sensitive film is used for a humidity sensor. Background technique [0002] A humidity sensor is a sensor that detects the humidity of the external environment. It can convert the humidity signal of the measured environment into an electrical (or frequency) signal that is easy to process, display, and record. It is an important type of chemical sensor. It is widely used in warehousing, industrial production, process control, environmental monitoring, household appliances, meteorology, etc., such as grain storage, precision electronic component manufacturing, high-altitude weather detection, greenhouse planting, etc. Among them, the polymer resistive humidity sensor has become a research hotspot because of its ...

AI Technical Summary

Problems solved by technology

[0003] Polymer moisture-sensitive materials are usually composed of various salts (sulfonates, quaternary ammonium salts, etc.), which have strong water absorption, and are usually easily dissolved and flowed by water in continuous operation in a high-temperature and high-humidity environment, resulting in stability At present, it is reported that a series of methods such as compounding, cross-linking, and protective film are used to improve its water resistance at room temperature. However, due to ordinary cross-linking, although the film is dense, the air permeability is reduced, and the cross-linking network is uneven, which increases the part Humidity stagnation, moisture absorption and dehumidification are difficult, which reduces the electrical properties such as response speed and sensitivity. In high temperature and high humidity environment, the effect is still not ideal