1, Eliminating or inhibiting the activity of various metabolic enzymes in the mold cells.
2, Reacting with the amino or sulfhydryl groups of enzyme proteins to inhibit or destroy their functions.
3, Inhibiting the synthesis of RNA during spore germination, thus preventing spore germination.
4, Accelerating the promotion of phosphate oxidation-reduction system to destroy the function of the cell.
5, Destroy the energy release system in mycobacterial cells; inhibit the electron transfer system and transaminase system, etc.
Glycolic acid is very expensive. In China, lactic acid (2-hydroxypropionic acid) is often used instead of glycolic acid to make the corresponding chelating titanate coupling agent. The performance is also very good.
Another series is the group containing diethylene alkoxy group. Ken rich company adds the number 200 before the brand. Structural formula:
CH, OOCHi rOCH j,
It is composed of KR-238s grade of monoalkoxy titanium tripyrophosphate KR-38s plus 200. The hydrolytic stability of 100 is more stable than the 200 series, and the 200 series is more effective than the 100 series for reducing the viscosity of the system. The 200 series is coupled with pigments and fillers to produce ethylene glycol (see Figure 15-8). In the polyurethane system, if there is excess isocyanate, cross-linking polymerization will occur, basf montan wax while the 100 series will not produce cross-linking.
Chelating coupling agents have good water resistance, but most of them cannot be dissolved in water. There are three ways to disperse them in water.
Directly disperse at high speed and grind the coupling agent, water, pigment and filler together. However, before adding the pigment and filler, avoid high temperature and long-term contact between the coupling agent and water, because the chelating type has good water resistance, but high temperature And for a long time, the coupling agent may be hydrolyzed and become invalid. ②Titanate containing phosphoric acid group, pyrophosphate group and sulfonic acid group can be dissolved in water by using alkylamines and amines to generate quaternary ammonium salt. The operation method is as follows: first put the titanate coupling agent in the container, under stirring and cooling in a water bath, gradually add the amine reagents, control the internal temperature not to exceed 71 ℃, measure the pH at any time, and add it dropwise until the pH is 6~ 8 (pH can also be adjusted to about 8.5), indicating that the quaternary ammonium salt has been completed.
Leave a message
We’ll get back to you soon