tailieunhanh - Ebook Chemistry of the textile industry: Part 2

(BQ) Part 2 book "Chemistry of the textile industry" has contents: Easy care, machine washable knitwear – production routes, coated and laminated fabrics, scouring, enzymes and softeners, the colouring of textiles, the environmental impact of the textiles industry. | 5 Easy care . HEYWOOD Introduction Amino resin finishing commenced in the early 1920s when Tootal Broadhurst Lee took patents out on the manufacture of simple urea-formaldehyde resins for the production of crease-resistant fabrics Foulds et al. 1926 . Those original patents also included phenol formaldehyde as well as urea the phenol formaldehyde could be discounted due to its colour. But Tootal Broadhurst Lee commercialised on their patent and built up a world wide licensing organisation where companies licensed the process and when they produced the required standards of crease resistance and tensile strength were granted the Tebilized Registered Trade Mark label. The general formulation for production of the resin was as follows. The product itself would have a limited shelf life dependent on local conditions pH conditions and temperature. NH2 c X Xsnh2 nhch2oh HCHO cc NH2 Monomethylol urea nhch2oh cof fH2 nhch2oh HCHO- CC NHCH2OH Dimethylol urea The process required an acid catalyst together with a drying and curing schedule which is still practised in modern resin finishing. The manufacture of own-made resin was still prevalent in the UK until 1993 when the last two companies producing their own-made precondensate ceased production and went over to a manufactured precondensate. After urea a full range of products was developed each one containing formaldehyde such as the following Figure . 1. Urea-formaldehyde 2. Highly condensed urea-formaldehyde 3. Methylated urea-formaldehyde 4. Melamine-formaldehyde 5. Methylated melamine-formaldehyde 174 CHEMISTRY OF THE TEXTILES INDUSTRY NHCH2CH HOHjCHN-C C-NHCH2CH N Trimethylol melamine H2C----CHj HOHjC N N CH OH xcoz Dimethylolethyỉene urea HO HC------CH OH . J. ì Í . HOHjC N N CH OH xcoz Dimethyloldihydroxyethylene urea DMDHEU HjC CH 1 I HOHj c N N CH2OH xcoz o HjC CH2 I I HjCOHj c N CH2 XH Dimethylolpropylene urea Dimethoxymethyl uron Figure Examples of major resins used in the industry and their .

• Hoá học
• The colouring of textiles
• Chemistry of the textile industry
• The textile industry
• Easy care
• Machine washable knitwear
• Laminated fabrics