The Preparation And Performance Research Of Building Waterproof Moisture Permeability Spunlaced Nonwovens

Nonwoven material currently on the market is mainly composed of spun-bond and needle-punched process preparation,although the material has excellent performance of waterproof,Strong flexibility and breathable performance needs to be improved.Spun-lace technology as one of the fastest growing non-woven technology,the products have good strong flexibility and breathable performance,applications continue to be expanded.The application in the field of building waterproofing is developing.The topic use regenerated polyester fiber with different specifications,prepared spun-laced composite nonwoven materials after carding,then use different two-sides finishing to the materials,the materials can have excellent moisture and permeability functions.And spun-lace non-woven material in building waterproofing applications provides a reference in the field.This project references a lot of references,summarize the many practical applications experience,focus on the following aspects of the work:Firstly,compared the basic performance and the source of common fiber raw materials in building waterproofing,the fiber raw materials of the project can be determined.Microdenier layer using different lapping ways and different of spun-lace process to reinforce material,finally to determine suitable lapping way and spun-lace process parameter;secondly,compared with performance of finishing agent,used different finishing projects,changed finishing process parameter(finishing agent concentration,baking temperature,baking time),tested hydrophilic and hydrophobic effects of the material to determine suitable finishing agents,finishing project and process parameters;lastly,changed fiber specifications and area density ratio to prepared many different samples,and compared performances of samples before finishing and after finishing to determine the appropriate sample type.Based on the above three aspects of work,following main conclusions are obtained:(1)Recycled polyester fibers have high strength,heat resistance,good anti-acid character,wide source of raw materials and so on,meeting waterproofing application requirements,so it determines recycled polyester fibers as the fiber material of this project.(2)Appropriate spun-lace number is six,pre-wetting 1,positive 3,side 2,spun-lace pressure respectively is 25,60,80,100,120,80 bar.(3)The longitudinal and transverse tensile strength and tearing strength of fine denier cross layer sample are very close,the longitudinal tensile strength and tearing strength of fine denier direct layer sample is bigger than transverse tensile strength and tearing strength,and the difference is large.The moisture permeability,permeability properties,resistance to hydrostatic pressure of the two samples is approximate,so the final way of fine-denier layer is cross lapping.(4)Compared performance of agents,used bubble finishing method,spray method,impregnated method,scraping coated method respectively on sample for finishing,research finishing process parameter changes on performance effects.Finally,it determined TG-521 B as this project waterproof agent,TF-629 C as hydrophilic agent,TF-601 H as thickening agent,scraping coated method as this subject finishing project,waterproof agent TG-521 B right concentration is 100g/L,hydrophilic agent TF-629 C right concentration is 1g/L,proper baking temperature is 170 degrees,baking time is 2min.(5)Changing fiber specifications and area density ratio to prepared six different samples and compared the performance of six samples.The research showed that,six samples area density all are about 110g/m2,coefficient are within 5%,uniform of area density is good;Thickness of sample become bigger as fine denier fiber area density increase;The fiber surface becomes smooth after hydrophilic finishing,formed a hydrophilic film,contact angle becomes smaller,hydrophilic effect is enhanced;The fiber surface attaches agent and become rough after hydrophobic finishing,contact angle becomes bigger,water repellent performance is enhanced;The breathable performance,resistance static hydraulic performance of the samples is improved after finishing,the breathable performance has small range declined;The anti-wet grade is above 95 points(4 level);The stretch strength and tear strength of sample reduce as fine denier layer area density increase,elongation rate rise.The stretch strength and tearing strength improved after finishing,elongation rate has declined.Six samples performances all get improved.(6)Contrast the performance of six specimens,with the increase of fine-denier fiber density ratio,overall thickness of the sample increased,moisture permeability decreased,permeability decreased,hydrostatic pressure resistance performance enhancement,tensile strength and tear strength decreased,elongation and tear elongation increased.Sample b1 can be selected as an optimization program,its fine denier layer fiber specifications is 1.56dtex×38mm,area density is 30g/m2,rough denier layer fiber specifications is 3.33dtex×51mm,area density is 80 g/m2,sample of breathable volume is 4295.78g/(m2 ? d),breathable rate is 2456.2mm/s,anti-wet grade is 96 points,hydrophobic and hydrophilic contact angle respectively is 146.8° and 34.1°,Longitudinal and transverse tensile strength respectively is 434.42 N and 435.35 N,vertical and horizontal elongation rates are 50.82%,50.45%,vertical and horizontal tearing strength respectively is 196.73 N,198.14 N,vertical and horizontal tearing elongation rates are 52.36% and 53.85%.