Showing papers in "Leather and Chemicals in 1999"

The Utilization of Chromed Leather Wastes in the Research of Leather Chemicals

Abstract: The utilization of chromed leather wastes in developing leather chemicals was biefly summarized. Chrome compounds recovered through incineration,oxidation or hydrolysis of the waste could be reused as tanning agent. Peptied separated from the hydrolysate of the waste was a kind of raw material in developing retanning agents,finishes and fatliqours and the mixture of chrome and peptide,with some modification,could be directly used in tanning process.

Investigation of Relation between Composition of Multi_vinyl Polymer Tanning Agent and Properties

Abstract: In the preceding study,the two_power regression orthogonal design is determined to probe into the relation between composition of vinyl polymer tanning agent and properties. Six monomers (AN-acrylonitrile,AM-acrylic amide,MAA-methyl acrylic acid,MMA-methyl methacrylate,VAc-vinyl acetate,EA-ethyl acrylate) are chosen to copolymerize with acrylic acid(AA) to form bipolymers. Using these bipolymers as tanning agents,detecting ten proper indexes of retanning leather samples,e.g. thickness increment ratio,shrinking temperature increment,phy_mech properties,compressible factor,etc.,and regressing the data,the experimental cognitive equations related properties with composition are gotten. The form is y p=ax 2+bx+c(p,a,b and c are regressing parameters). In this paper,the hexapolymers composed with five monomers (AN,AM,MAA,MMA,VAc,EA) and acrylic acid are investigated. To nine indexes,nine equations are got,and the form is:y p=b 0+∑5i=1b ix i+∑5i=1,ijb ij x ix j+∑5i=1b ii x 2 i. And further discussions are also given.

Preparation of Acrylic Amphiphilic Retanning Fatliquoring Agent

Abstract: Methacrylate and dodecanol, in the proportion of 1.1-1.21 (on mol) are reacted at 120 for 2.5h to prepare methacrylic dodecanol ester and at (811) dropped by a certain amount of dodecyl sulfonate sodium and sulfated castor oil, followed by the redox reaction of initiator. The aqueous acrylic monomer is added, as many as 9 times, at the speed of 1 drop/3-5s. The obtained retanning fatliquor has better stabilities and electrolyte stabilities.

Comparison between Main Properties of Polyurethane Dispersions Based on DMBA and DMPA

Abstract: Anionic PU dispersions with different COOH contents and NCO/OH rations were synthesised from polyols,toluene diisocyanate (TDI)dimethylolbutyric acid (DMBA) or dimethylolpropionic acid (DMPA)and chain extenders Physical and mechanical properties of the PU dispersions have been compared in this paper The results show the advantages by using DMBA versus DMPA in the parperation of anionic PU dispersion

Investigation of Relation betweenComposition of Vinyl Polymer Tanning Agent and Properties

Abstract: In this study,the two_power regression orthogonal design is determined to probe into the relation between composition of vinyl polymer tanning agent and properties. Six monomers (AN-acrylonitrile,AM-acrylic amide,MAA-methyl acrylic acid,MMA-methyl methacrylate,VAc-vinyl acetate,EA-ethyl acrylate) are chosen to copolymerize with acrylic acid(AA) to form bipolymers. Using these bipolymers as tanning agents,detecting ten proper indexes of retanning leather samples e.g. thickness increment ratio,shrinking temperature increment,phy_mech properties,compressible factor ,etc.,and regressing the data,the experimental cognitive equations related properties with composition are gotten. The form is yp=ax2+bx+c (p,a,b,c is regressing parameter). The influence of retanning agent composed with different comonomers on the property indexes of leather samples are also discussed.