摘要:
A filter media sheet comprising fine particulate and a self-bonding matrix of cellulose fiber, the surfaces of at least one of which are modified with a polyamido-polyamine epichlorhydrin cationic resin, the matrix incorporating beaten cellulose fiber to provide a Canadian Standard Freeness of less than 600 ml.
摘要:
The invention is a fibrous, cationic cellulose pulp product and the method for preparing it. A water suspension of cellulosic fiber is treated under alkaline conditions with a condensate of epichlorohydrin and dimethylamine. Up to 30 molar percent of the DMA may be replaced by a crosslinking agent such as ammonia or a lower aliphatic diamine. The process may be carried out at room or elevated temperatures. It is practical to add the condensate at one of the later alkaline stages of a bleaching process; e.g., an alkaline extraction or peroxide stage. This is most preferably done later than any chlorination or hypochlorite stages. The product shows greatly improved retention of acid and other anionic dyes. It also shows superior retention of some pigments and latices without the need for other cationic aids. In some cases a small amount of alum appears to have a synergistic retention effect with the cationic pulp product when used with titanium dioxide and certain anionic latices.
摘要:
The invention relates to a method and treatment system for making of paper or surface ply of a multi-ply board from a fibre suspension, where at least 90 weight-% of fibres originate from chemical pulping process, chemi-thereto mechanical pulping process and/or office waste deinking pulping process. The fibre suspension further comprises inorganic mineral particles and cationic starch. A cationic copolymer of acrylamide and cationic monomers is incorporated to the fibre suspension and it is allowed to interact by flocculation with at least some of the said components of the fibre suspension. An anionic copolymer of acrylamide and more than 30 mol-% of anionic monomers is added to the fibre suspension, and fibre suspension is formed into a fibre web and drying the web to a dryness of at least 80%. An aqueous surface composition comprising polymeric binder is applied on the surface of the web.
摘要:
The present invention provides a novel cationized microfibrillated plant fiber and a method for manufacturing the same. A cationic microfibrillated plant fiber that is cationically modified with a quaternary-ammonium-group-containing compound, and that has an average diameter of 4 to 200 nm.
摘要:
Cellulose particles are described that have cationic groups in their interior. In one aspect, at least 10%, and preferably 50% or more, of the cationic groups are present within the particle interior. Also disclosed are particular combinations of such cellulose particles with certain water-soluble polymers that are well suited for use in the papermaking industry.
摘要:
A decorative base paper for decorative coating materials contains a pigment mixture of titanium dioxide and talc, wherein the talc has a particle size distribution D50 of less than approximately 3.0 nullm, and both the decorative base paper and the decorative paper have a high capacity.
摘要:
The invention is a fibrous cellulosic product, containing a uniformly dispersed polymeric material which has been deposited in an aqueous suspension from an anionic latex, and the method for its manufacture. Cellulosic fiber is first cationized by treating it in an aqueous suspension with the condensation product of epichlorohydrin and dimethylamine. Up to 30% of the dimethylamine may be replaced with a crosslinking agent which can be ammonia or an aliphatic diamine such as hexamethylene diamine. The cationized fiber, with or without small quantities of alum, will effectively retain a wide variety of anionic latices when treated in an aqueous environment.
摘要:
A ceramic sheet comprising 5 to 50 wt. % (absolute dry weight) of a cation-modified pulp having a degree of substitution of cationic group of 0.02 to 0.04 and beaten to freeness of 200 to 100 ml C.S.F. and 50 to 95 wt. % of fine inorganic particles dispersed uniformly in and supported by said cation-modified pulp. This ceramic sheet can be easily prepared from an aqueous suspension of the cation-modified pulp and the fine inorganic particles by using a paper-making treatment.
摘要:
Filter media sheets comprising particulate retention aid consisting of cellulose pulp of +100 to -100 Canadian Standard Freeness, and method of making the same.