Preparation method of epichlorohydrin toughened high ortho phenolic fiber
An epichlorohydrin and phenolic fiber technology, applied in the chemical characteristics of fibers, melt spinning, textiles and papermaking, etc., can solve the problems of poor toughness and low tensile strength of phenolic fibers, and achieve regular structure and fast cross-linking rate. , the effect of fast curing rate
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Embodiment 1
[0015] Embodiment 1: a preparation method of epichlorohydrin toughened high ortho phenolic fiber, comprising the following steps: (1) heating epichlorohydrin, phenol, formaldehyde, zinc acetate to boiling, and reacting; (2 ) add concentrated sulfuric acid to continue the boiling reaction, wash with high temperature water, cool down, and then continue to heat up in decompression dehydration, remove the water and impurities in the solution and the reaction, and obtain epichlorohydrin toughened high-ortho-position phenolic resin; (3) Obtain The epichlorohydrin toughened phenolic resin is melt-spun and drawn to obtain high-ortho-position phenolic fiber precursors. The high-ortho-position phenolic fiber precursors are cured and cross-linked in a coagulation bath containing formaldehyde and HCl to obtain epoxy chlorine Propane toughened high ortho phenolic fibers.
Embodiment 2
[0016] Embodiment 2: A preparation method of epichlorohydrin toughened high-ortho phenolic fiber, wherein the mass ratio of phenol: formaldehyde (according to 100% formaldehyde content) is 1: 0.24 ~ 0.30, the mass ratio of phenol: zinc acetate The ratio is 1:0.005~0.04, and the mass ratio of phenol: epichlorohydrin is 1:0.05~0.4. , The mass ratio of phenol:concentrated sulfuric acid is 1:0.001~0.01.
[0017] Others are the same as embodiment 1.
Embodiment 3
[0018] Embodiment 3: A kind of preparation method of epoxy chlorohydrin toughened high ortho-position phenolic fiber, comprises the following steps: (1) phenol, formaldehyde, zinc acetate are heated to boiling, react, add epoxy chlorine after reaction finishes Propane; (2) add concentrated sulfuric acid to continue the boiling reaction, wash with high temperature water, cool down, and then continue to heat up in decompression dehydration, remove the water and impurities in the solution and the reaction, and obtain epichlorohydrin toughened high ortho phenolic resin; (3) The obtained epichlorohydrin toughened phenolic resin is melt-spun and drawn to obtain high-ortho-position phenolic fiber precursors, and the high-ortho-position phenolic fiber precursors are cured and crosslinked in a coagulation bath containing formaldehyde and HCl. Obtain epichlorohydrin toughened high ortho phenolic fiber.
[0019] Among them, the mass ratio of phenol: formaldehyde (based on 100% formaldehy...
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