| At present,sea-island fibers are widely used in the field of microfiber synthetic leather,but most of the sea-island fibers of traditional sea-island fibers are polyethylene(PE),so it is necessary to develop an environmentally friendly sea component material to prepare sea-island fibers.As a water-soluble material,polyvinyl alcohol(PVA)has good acid and alkali resistance and is widely used.However,PVA is a polyhydroxylated polymer with super-strong intermolecular hydrogen bonds.This molecular structure leads to its melting point being close to its decomposition temperature,making it difficult to process thermoplastically.If PVA melt spinning can be realized,it will bring an environmentally friendly material to the preparation of sea-island fibers,and produce certain scientific and technological significance and economic benefits.This subject adopts the method of blending and plasticizing modification to plasticize and modify PVA.The proportion of plasticizing system,the preparation process of water-soluble PVA chips and the composite spinning process with PA6 are studied in detail.And the properties of PVA/PA6 sea island fibers were analyzed,and the following conclusions were drawn:A is the main plasticizer of the modified body,B is an auxiliary plasticizer,and E is an additive.When their addition ratios are 6%,4%,and 0.4%,the thermal decomposition temperature of PVA increases,and the melt flows.Sex gets better.At this time,the melting point of PVA was 212.8 ℃,the thermal decomposition temperature was 336.9 ℃,and the melt index was 44.5 g/10 min.The granulation temperature is set to 60 ℃,100 ℃,180 ℃,200 ℃,190 ℃,190 ℃,190 ℃,200 ℃,220 ℃,230 ℃,230 ℃,the screw speed is 160 r/min,and the feeding speed is 5 Hz,The preparation process of water-soluble PVA slices is smooth,and the finished product performance is good.PVA slices are dissolved in hot water above 95 ℃.As the temperature increases,the time required for complete dissolution becomes shorter.For the convenience of industrial production,the water-dissolving temperature should be set to 100 ℃.The dissolution rate of PVA slices in hot water is the fastest within 12 min～16min,and basically unchanged after 18 min,so the dissolution time is determined to be18 min.Water-soluble PVA and PA6 sea-island composite spinning process parameter setting: the temperature of the sea component(PVA)is set to 210 ℃,220 ℃,220 ℃,230 ℃,230 ℃,230 ℃;the temperature of the island component(PA6)is set to set as230 ℃,240 ℃,250 ℃,250 ℃,250 ℃,250 ℃;spinneret temperature is 250 ℃;side air blowing is 15 ℃;The wire speed is 1000 m/min～1500 m/min.At this time,the fibers are well formed and have better strength.The "sea" components of water-soluble PVA and PA6 sea-island fibers can be removed by soaking in a water bath at 100 ℃ for at least 18 minutes,and the removal rate can reach more than 26%. |
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