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Plastic runway adhesive bonding related knowledge

2013/7/16      view:

Plastic runway adhesive is by quantitative polyols, trichloroethylene, triethanolamine to join synthetic kettle, open the steam valve will be under stirring reaction material heated to 80 ℃, and then add the quantitative MDI partial kettle for synthesis reaction. Stay after the MDI plus, continue to reaction 3 h under 80 ℃, thus made, its viscosity of 2.4 Pa, s.


Plastic runway adhesive manufacturing process, the influence of the four factors on the quality of the adhesive are:


1. The reaction temperature

Reaction temperature is an important process parameters. Temperature directly affects the quality of the product, and then influence the performance of the plastic products. Under the high temperature synthesis, apparent viscosity increases, serious when, can reach half curing condition. According to the requirement of the plastic products and the application of the actual situation of the adhesive viscosity control within 2.3 ~ 2.6 Pa • s advisable. The viscosity of the product can make the plastic products with good mechanical properties and elasticity. Production practice shows that control the reaction temperature 80 ℃, the viscosity of the adhesives was 2.4 Pa, s.

2. The reaction time

The reaction time had a great influence on the quality of the adhesive. With the extension of reaction time, the viscosity increased. Appropriate reaction time to obtain the best viscosity. Figure 2 shows the relationship between reaction time and viscosity. Practice shows that the reaction time control in 3 h is advisable. When can reach half curing condition. According to the requirement of the plastic products and the application of the actual situation of the adhesive viscosity control within 2.3 ~ 2.6 Pa • s advisable. The viscosity of the product can make the plastic products with good mechanical properties and elasticity. Production practice shows that control the reaction temperature 80 ℃, the viscosity of the adhesives was 2.4 Pa, s.

3. The reaction ratio of raw materials

Reaction ratio of raw materials is the key process conditions. It is not only related to the production cost, more important is directly affect the quality of the adhesive. Second reaction ratio of raw material is the best. The MDI, polyols, trichloroethylene, triethanolamine = 15, 30, 2, 3

4. The stirring speed

Stirring speed control at the beginning of the reaction, reaction system viscosity is small, with the addition of MDI, viscosity increased. If the stirring speed too slow to make reaction heterogeneous material dispersion, reaction will occur too much local viscosity caused by uneven phenomenon. If the stirring speed too fast, easy to foam the reaction liquid, the splash, kettle wall conjunctiva, affect the heat transfer. Practice shows that mixing speed control in 100 ~ 200 r/min.