Today's article is difficult to understand. It is a professional term. In fact, it just wants to explain the influence of vulcanization pressure on tear strength and compression set rate of sealing gasket of plate heat exchanger.

Through the joint research and experiment of our engineers and technical team, it is found that with the increase of curing pressure, the distance between macromolecular chains in the compound of sealing gasket of plate heat exchanger gradually decreases, resulting in the improvement of curing crosslinking efficiency, resulting in the increase of crosslinking density of compound, which leads to the gradual increase of 300% elongation stress, tensile strength and tear strength The phenomenon of gradual decrease. There are not only polysulfide bonds, but also monosulfide and disulfide bonds between vulcanizates. Because polysulfide bond has higher tear strength than single and double sulfur bond. Therefore, the tear strength of the compound increases with the increase of polysulfide bond, and decreases with the increase of monosulfide bond and disulfide bond.

In the experiment, with the increasing of curing pressure, the distance between rubber macromolecular chains decreases and the crosslinking density increases, which means that the average distance between vulcanized rubber macromolecular chains decreases. With the decrease of average distance, the number of monosulfide and disulfide bonds increased, and the decrease of polysulfide bonds led to the decrease of tear strength.

With the increase of vulcanization pressure, the compression set rate of the rubber material in the sealing gasket of plate heat exchanger also decreases, because the distance between the macromolecular chains gradually decreases, the probability of cross-linking between the double bonds of the macromolecular chains increases, and the vulcanization cross-linking efficiency increases. The results show that the crosslinking density of rubber increases and the compression set of rubber decreases significantly.

The final conclusion is that, in the molding and injection mode, the vulcanization pressure of the rubber material in the mold cavity of the sealing gasket of plate heat exchanger  always increases with the increase of time, and the vulcanization pressure finally decreases, and the vulcanization pressure increases. With the extension and extension of 30%, the vulcanization pressure increases.