A kind of preparation method of high-viscosity resin cast body

Abstract

The invention belongs to a macromolecular material evaluation technology. A resin matrix and / or a curing agent are / is dissolved or diluted through the dilution of a low-boiling-point solvent to resin and the characteristic that the low-boiling-point solvent is easy to discharge; the viscosity of a resin system at normal temperature is reduced; then heating is executed to remove the solvent and air bubbles in vacuum, including determination of initial curing temperature, dissolving and mixing, viscosity adjustment, bubble removal and curing processes. According to the method, the air bubbles formed in a high-viscosity resin casting forming process can be effectively eliminated; the non uniformity of the performance of the resin casting body, which is caused by deposition in the curing process, is prevented; the preparation method is suitable for resin systems which are liquid, semisolid and solid at the room temperature and also suitable for resin systems in which the curing agent, an accelerant and the like cannot be dissolved in main resin; the preparation method is particularly suitable for resin systems which are solid or semisolid under the room temperature and are still extremely high in viscosity after being heated to the initial curing temperature.

Description

technical field [0001] The invention belongs to the field of material technology, relates to polymer material molding technology, in particular to a high-viscosity resin evaluation technology. Background technique [0002] The preparation of resin castings has a decisive reference value for evaluating the performance of the resin system, and is the basis for comparing the performance of resins. Therefore, whether a new resin formulation casting can be correctly prepared determines whether the resin system is in production. be successfully applied. [0003] At present, the resin casting body is mainly prepared according to the method described in GB / T257-1995. The resin, curing agent and accelerator are mixed evenly according to the proportion, and then the mixed resin glue is placed in a vacuum oven to evacuate several times. Time, then slowly and continuously pour the resin into the horizontal mold coated with release agent, and cure in the blast drying oven according to t...

AI Technical Summary

Problems solved by technology

This method is mainly suitable for room temperature curing with long pot life or heat curing resin system with low viscosity at room temperature, for resin systems with high viscosity at room temperature or even solid state and high viscosity when heated to the initial curing temperature , the above method cannot effectively eliminate the air bubbles in the resin, and cannot truly characterize the mechanical properties of the resin system

[0004] In view of the above problems, Zhang Xianjun et al. ("Plastic Industry" Vol. · 26 no · 6) The method of adding active diluent to the resin system reduces the viscosity of the resin at room temperature and effectively reduces the air bubbles in the resin cast body, but this method changes the components of the original resin system and cannot accurately reflect the performance of the original resin

[0005] CN 201110288128 is aimed at phenolic resin, after pumping to a certain degree of vacuum at a certain temperature, open the vacuum valve, then evacuate to the degree of vacuum and then open the vacuum valve, so many times to eliminate the bubbles in the resin system, but this method is The effect in the specific use process is not particularly ideal, and the elimination of air bubbles is not complete, especially for resin systems that still have relatively high viscosity when the resin is close to the initial curing temperature