Qingzhou City Dehai Fine Chemical Plant

PPE (PAV) wet strength agent is called polyamide polyepichlorohydrin resin. It is a water-soluble, cationic, thermosetting resin. It does not contain formaldehyde polymer. It is non-toxic and tasteless. It can be neutral, slightly alkaline and acidic. Under the conditions of papermaking, PH value is applicable to a wide range; PPE wet strength agent has higher reinforcing effect on wood pulp than grass waste paper. With the increase of beating degree, the surface area of ​​pulp fiber increases, and the adsorption capacity to wet strength agent becomes larger. The dry and wet strengths are correspondingly improved; the negatively charged fillers, rubber compounds and fine fibers have a strong adsorption effect, and the papermaking process has obvious retention and filtration aids; the amount of addition depends on the wet strength requirements of the paper. Excessive addition will lead to flocculation of pulp, affecting the uniformity of papermaking and the recycling of damaged paper, which will seriously stick to the sticky and sticky cylinders; the difference in paper sheets will have a certain influence on the retention rate of PPE wet strength agent; after adding PPE The wet strength of the paper sheet is only about 70%, and the wet strength should be high after 7-15 days of ripening; the PPE can increase the dry strength by 15-20%; the retention and filtration aids are obvious. Fiber retention rate can be increased from 70% to 80% Above, the clarity of white water is obviously improved; the synergistic effect on AKD can reduce the amount of AKD; the paper has improved folding resistance, surface strength and transverse expansion ratio, and it is good for reducing wet paper web breakage during paper machine operation. effect.