One-component polyurethane liquid adhesive

One-component PU liquid glue is easy to use and very popular with users. This type of gel is reactive and non-reactive 2 types. Reactive single-component PU adhesives mainly include moisture-curing, latent-curing, blocking, and acrylic-modified PUs for ultraviolet light, electron beam curing, and the like. Non-reactive rubbers are thermoplastic, and are generally used for PVC compounding, textiles, paper coatings, and applications where bonding is not critical.

The moisture-curable PU adhesive is cured by reaction of the terminal NCO with a trace amount of moisture, but the reaction speed is slow, and CO: is released to generate bubbles, which affects the bonding strength and the final performance. People use suds suppressor or a latent agent to make latent PU adhesive. In case of moisture or moisture, the latent agent reacts with water first to form active hydrogen compound, and then reacts with NCO group to increase the initial viscosity and prevent bubbles. IS I1 alkane and blocked diamines.

The closed type PU glue is used to seal the NCO at the end of the prepolymer with a blocking agent, and when it is used, it is deblocked by heating, and the NCO is released to immediately react and crosslink with the active hydrogen component in the component. Shanghai Lord Chemical Co., Ltd. Flock-lok 853 rubber flocking adhesive is used as a representative product when it is unsealed and cured at 204°C for 3 min.

China's single-component solvent-free (or low-solvent) moisture-cured PU rubber production unit more. The earliest production was the 717 glue of Shanghai Pen Parts Factory (now Great Wall Fine Chemicals). Yantai Huayang's HA-100 rubber can be used for the bonding of PVC and human hair. The chlorinated hydrocarbon polymer developed by Liming Chemical Institute and the improved castor oil-based one-component PU adhesive developed by Dawning Chemical Institute have good initial tackiness, softness, and good performance under high humidity conditions. Jiangsu Chemical Industry Institute and other units use a single-component non-solvent adhesive to bond rubber waste to make elastic mats and cork sticks to make cork stoppers. Shanghai Xinguang Factory's 1080 glue is used for the docking of wet gardens and can be lifted and piled up in 0.5 h. In addition, the 1021 adhesive-bonded steel test piece has a 72-hour shear strength of more than 7 MPa, and bonded hard oily mahogany in boiling water after 72 hours. Cooked 3d no change. In addition, Changchun Yinghua Institute, Jiangsu Jingjiang Adhesive Factory, etc.

MPU styrofoam produced, also known as sandwich board glue, anti-theft door door rubber, and so on, there are currently dozens of production units. When this type of adhesive is bonded, it can be micro-foamed with moisture or moisture and penetrates the gap at the same time. It is particularly suitable for the bonding of porous materials and various kinds of plates to form a composite sandwich panel for thermal insulation of buildings, vehicles, ships, etc. , sound insulation, insulation places.

The development trend of the moisture-curing one-component PU adhesive is to improve the storage stability and accelerate the curing speed; the prepolymer is developed from a single type to a composite type; and the silicone resin, epoxy resin, and acryl vinegar are used for modification, so that the cured product is concurrent With a good performance of polyurethane and modifiers. In addition, one-component wet-curable liquid adhesives can also be combined with cross-linking curing agents to form two-component fast-curing, yet another class of rubbers with good properties.