A kind of modified polyvinyl alcohol non-woven fabric and its preparation method and application

Abstract

The invention discloses a modified polyvinyl alcohol nonwoven fabric, a preparation method and application thereof. The method is realized through processes and methods: after the non-modified polyvinyl alcohol non-woven fabric enters the preheating zone to fully preheat the non-woven fabric; enters the metered spray coating for double-sided coating of modifiers; Then it enters the air flotation drying tunnel for drying; the dried non-woven fabric is calendered (embossed) and roller calendered (embossed); it enters the double cooling roller to cool and shape, and is wound into a finished product. The modifier used for coating, in parts by weight, includes the following components: modified polyethylene oxide aqueous solution 100; gelatin 0.1-0.3; complexing agent 3-10; isopropanol 5-10; glycerol triacetate 1 ‑3; substrate wetting and penetrating agent 0.3‑1.0; thixotropic agent 0.5‑1.0; thermal oxygen stabilizer 0.01‑0.05. The non-woven fabric prepared by the modification of the above process can not only strengthen the mechanical and physical properties, but also enable the non-woven fabric to obtain excellent heat sealing performance.

Description

technical field [0001] The invention relates to the field of fiber composite material preparation, in particular to a modified polyvinyl alcohol nonwoven fabric and a preparation method and application thereof. Background technique [0002] As an environmentally friendly material, polyvinyl alcohol (PVA) has been rapidly developed and applied in many fields in recent years. Polyvinyl alcohol (PVA) materials have abundant sources of raw materials and relatively mature production processes, especially in the field of fiber production and application, the mature production process of vinylon fibers produced with polyvinyl alcohol as the main raw material is wet The method of spinning is the aqueous solution spinning method, and the preparation of polyvinyl alcohol non-woven fabrics is in the pre-production process of vinylon, polyvinyl alcohol (PVA) is formed by the wet spinning coagulation bath of polyvinyl alcohol fibers, not to continue The direct use of acetal treatment to...

AI Technical Summary

Problems solved by technology

[0004] As we all know, since the melting point of polyvinyl alcohol is as high as 220-230°C, under heated conditions, polyvinyl alcohol begins to be unstable and decomposes at 180°C. As the temperature continues to rise, not only the decomposition intensifies, but also crosslinking occurs; Therefore, pure polyvinyl alcohol does not have thermoplastic processing properties under normal circumstances. Therefore, under current conditions, pure polyvinyl alcohol materials cannot be compared with general thermoplastics polypropylene (PP), polyethylene (PE), Polyester (PET), nylon (PA), etc., realize melt spinning (Melt spinning) through their thermoplasticity: that is, melt extrusion spinning (Meltextruded fabric), melt blown spinning (Melt blown spinning), and melt spinning Stick (Melt spunbond) and other methods to prepare polyvinyl alcohol fibers and non-woven fabrics; even the polyvinyl alcohol fibers spun by wet (solution spinning) do not have thermoplasticity, so the polyvinyl alcohol fibers spun by wet methods The polyvinyl alcohol non-woven fabric produced by the fiber also does not have thermoplastic heat sealing performance at all; this is one of the biggest defects of polyvinyl alcohol fiber and non-woven fabric, that is, it cannot be used like non-woven fabrics prepared by other commonly used thermoplastic synthetic resins. Cloth has excellent heat-sealing performance, so that it is subject to certain restrictions in the application field. For example, the post-processing of non-woven fabrics: edge sealing, sealing, bag making, etc., can only be done by traditional manual sewing instead of automatic heat sealing. Technology Realization of Sealing Bag Processing Machinery

This leads to low processing efficiency and a sharp increase in cost.

[0005] In order to solve the defect that the above-mentioned polyvinyl alcohol non-woven fabrics do not have thermoplasticity, in recent years, thermoplasticity has also been obtained through post-processing modification of polyvinyl alcohol non-woven fabrics after molding, making them suitable for heat sealing, ultrasonic welding, etc. Methods such as edge sealing, sealing, bag making, etc., such as patents CN108221386A, CN109295726A, CN109371681A, etc., are obtained through the second processing and modification of polyvinyl alcohol non-woven fabrics, that is, padding and finishing in the later stage to obtain thermoplasticity; patent CN108729246A is also Through the second processing of the formed polyvinyl alcohol non-woven fabric, that is, the heat-sealing performance of the polyvinyl alcohol non-woven fabric is obtained by coating and compounding. The above-mentioned patented technologies use modified polyvinyl alcohol and Composite non-woven fabric

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