The influence factors of coating crosslinking agent

The influence factors of coating crosslinking agent, the crosslinking agent performance impact end hydroxyl polymer is the biggest factor and the ratio of anionic catalytic crosslinking agent, followed by the end of the molecular weight of polymer compounds and phenolic hydroxyl and the molar ratio of polyether.

In this kind of complex matches crosslinking agent, end hydroxyl polymer with anionic catalytic cross-linking reaction mechanism of crosslinking agent is different: end hydroxyl polymer mainly through end epoxy groups and hydroxyl of addition polymerization, the molecular chain gradually increased; And anionic catalytic crosslinker is through anion ACTS on the epoxy group make epoxy group open loop, form new anion, this new anion reacts with epoxy group, the recovery of the molecular chain.

Factors influencing the synthesis of phenolic epoxy resin including linear phenolic resin synthesis of phenol/formaldehyde mole ratio, reaction temperature and time, the composition of phenol, and phenolic epoxy resin synthesis of epoxy chloropropane, alkali, catalyst and the molar ratio of phenolic resin, etc.

The linear phenolic resin synthesis influence factors. In the linear phenolic resin synthesis, with the increase of ratio of bisphenol A and phenol, the softening point of the resin increases, the coating hardness and temperature resistance increased, but the softening point of the resin is too high, will make milling processing difficult.

Bisphenol A/phenol mole ratio with 1/2 ~ 1/4 advisable. With the decreasing formaldehyde/phenol molar ratio, amount of aldehyde, phenol reaction rate is low, low softening point of the resin, epoxy softening point of the resin is low, easy to agglomerate.

But high softening point of the resin is not suitable for machining, and reduced solubility, epoxidation difficult. Formaldehyde/phenol molar ratio with 3/4 ~ 4/5 advisable. Phenolic resin in the condensation reaction temperature is commonly reflow temperature (85 ~ 95 ℃), the time for 4 ~ 6 h. Reaction time is too short, inadequate; The reaction time is too long, little influence on the reaction yield increase.

The influencing factors of epoxy phenolic resin. Epoxy phenolic resin, with the increase of dosage of epoxy chloropropane, resin epoxy values increase, softening point, brittle also will increase.

Both the comprehensive performance of coating and milling machining performance, the resin epoxy value control eq in 0.11 ~ 0.11/100 g, and the matching dosage of epoxy chloropropane for 1/1.0 ~ 1/1.2 (mol/mol, hydroxyl), alkaline general control with epoxy chloropropane etc. Moore or a bit too much.

Different ratio of epoxy resin and gel time of crosslinking agent and the impact strength test. With the increase of crosslinking agent, the gel time shortened, its dosage is too high or too low, have decreased the impact strength. The reason for this is that consumption is low, incomplete crosslinking, slow reaction; Dosage is too high, a functional group is too much, will make the chain growth, molecular weight decreased, thus decreased the impact strength.

Coating performance tests. By resin, crosslinking agent = 100:25 ~ 26, plus other fillers and additives to make standard sample, carries on the mechanical properties of the coating, chemical resistance, electric performance test.

Commonly used crosslinked polymer gel system mainly include A1 system, Cr system and organic phenol class system three categories, including A1, Cr and polyacrylamide molecular carboxylic acid groups leading role, organic phenol reaction with polymer molecules of amide groups.




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The applicability of the A1 crosslinking agent gel. Aluminium citrate is the most widely used in polymer profile control A1 crosslinking agent, the aluminum ion and polymer gel has the characteristics of moderate intensity, easy to control.

However, organic aluminum crosslinking agent under the condition of high temperature generated by hydrolysis precipitation, is very unstable, and the commonly used aluminium citrate crosslinking agent only stable at low pH, under the condition of alkaline reservoir cannot be effectively formed gel. A1 reaction with polymer at room temperature quickly, so think, A1 crosslinking system is only suitable for low temperature, acid or neutral reservoir conditions.

The applicability of the Cr crosslinking agent gel Since the injection of polymer water erosion resistance is very poor, and Cr is a kind of very strong complexing agent, the gel formed by polymer with strong stability and scouring. Cr crosslinking agent is a kind of strong adaptability, low cost of crosslinking system, and it can tolerate a wide range of temperature and pH conditions, gelling time under control.

But Cr system in the temperature of 60 ℃ above, the gel is very quick, and easy to degrade, Cr is extremely strong and polymer complexation sex, practical application is not convenient, so we need Cr6, + reduction of Cr by adding a reducing agent.

Suitable for reservoir far well strip profile control, channel plugging big cracks. Studies have shown that in front of the profile control process using washing liquid cooling reservoir conditions, the Cr can be applied to reservoir conditions of up to 100 ℃, and suitable for high temperature profile near wellbore area of reservoir.

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Diethyl toluene diamine(DETDA)  http://www.yaruichem.com