The development of biodegradable pressure sensitive adhesive

The development of biodegradable pressure-sensitive adhesives has become an important direction for the green and sustainable development of the packaging industry and adhesive industries.

At present, the adhesive industry develops rapidly, in science and technology as well as in People’s Daily production and life, adhesives are playing an important role. Pressure-sensitive adhesive, as a kind of adhesive, is a new adhesive material that can be effectively cemented on the substrate with only small pressure and is not easy to pollute the adhesive after peeling. It has been widely used in the field of packagings, such as adhesive tape, label adhesive, and medical plaster adhesive.

However, most of the traditional pressure-sensitive adhesives are made of petroleum-based synthetic polymers, and their retention in the environment is a hidden danger to environmental protection. With the enhancement of people’s awareness of environmental protection, the research and development of environment-friendly pressure-sensitive adhesives have been attached to great importance gradually, among which the degradable pressure-sensitive adhesive is the most ideal environment-friendly adhesive.

In addition, with the decrease of non-renewable petroleum resources, it has become an inevitable trend of economic and social development to strengthen the research on renewable resources and seek efficient and renewable biomass raw materials to replace non-renewable petroleum products, which also makes the development of biodegradable pressure sensitive adhesive has become an important direction for the green and sustainable development of packaging industry and adhesive industry.

The preparation method of castor oil-based decompressing sensitive adhesive includes the following steps: (1) isocyanate is added to the reaction kettle, the reaction kettle is heated to 70 ~ 85℃, stirring, holding, and condensing reflux, and then the catalyst and non-ionic hydrophilic agent are added to the reaction kettle successively for 60 ~ 180min; (2) Add the reaction system after step (1) to another reactor containing castor oil, continue to react at 70 ~ 85℃ for 60 ~ 180min, and then add isocyanate reaction for 60 ~ 180min, after the end of adding diluent, cooling, to obtain castor oil-based decompressor sensitive glue; In terms of mass parts, in step 1), the dosage of isocyanate, catalyst, and the non-ionic hydrophilic agent was 1.0-1.5, 0.01-02, and 1.5-2.5, respectively. Step 2) The amounts of castor oil, isocyanate, and diluent are 3 to 8 parts, 1 to 7 parts, and 1 to 2 parts, respectively.