摘要:
The fibrous material is for the preparation of a sheet material containing large amounts of inorganic fine powders or inorganic short fibers by a usual paper-making method. A raw material for forming the fibrous material is previously impregnated with a polymer flocculant of the polyacrylamide type or the like in the amount of 0.01 to 5% (dry solids). The fibrous material is adaptable for sheets which can be prepared easily by individuals at home as well as at factories. The fibrous material can be utilized for a wide range of application, for example, for various ceramic products, construction materials, papers for special use, filters and so on and for recovery of solids from waste water or the like.
摘要:
A process for improving the qualities of paper which comprises making co-exist (a) a water-soluble polymer containing hydrazide group or its adduct with a water-soluble inorganic salt of an alkaline earth metal and (b) a heavy metal ion capable of chelating with the polymer or its adduct in a pulp slurry in paper making. The use of the water-soluble polymer or its adduct in combination with the heavy metal ion improves markedly the paper strength, the retention of sizing agents and the retention of fillers at a pH value around neutrality.
摘要:
Disclosed is a novel water-soluble thermosetting resin which has the property of providing paper with a nearly constant wet and dry strength over a wide pH range according to methods of wet-end additions or surface applications.
摘要:
A fibrous product containing (a) a papermaking grade of pulp, (b) a structured particle latex having pH independent cationic groups bound at or near the particle surface and (c) a co-additive. The pulp is represented by unbleached softwood kraft. The latex is represented by a structured-particle latex having (a) a core of a copolymer of styrene and butadiene (b) an encapsulating layer of styrene, butadiene and vinylbenzyl chloride which is reacted with 2-(dimethylamino) ethanol to form quaternary ammonium groups. The co-additive is represented by a hydrolyzed polyacrylamide having a degree of polymerization of 5500. To an aqueous slurry of the pulp are added the latex and an aqueous solution of the co-additive, the resulting suspension is dewatered and dried by heating.
摘要:
A non-ionic copolymer composed of (in weight percent) 5 to 30% N-vinyl pyrrolidone, 15 to 60% acrylamide, and 30 to 70% methyl methacrylate is disclosed. The copolymer is added in minor amount to paper pulp, especially pulp containing black liquor contamination, to improve the paper making operation and the dry strength of the paper.
摘要:
A highly absorbent and fragile composite sheet normally used as a throwaway domestic wiper is quickly and easily converted to a strong and attractive colored wallcovering. Thus, a composite layer comprising a net material sandwiched between and bonded to a pair of cellulosic-fleece (wadding) layers has a carrier sheet of paper bonded thereto, has colorant applied thereto, and is impregnated with a synthetic resinous bonding medium so that the fleece layers are bonded together at the mesh openings of the net material. In a preferred construction, the carrier sheet of paper has an internal cohesion inferior to that of the composite layer so that with the covering on the wall the composite layer is peelable from the carrier sheet adhering to the wall.
摘要:
A process is shown wherein an aqueous binder composition, preferably a latex binder composition, is foamed and applied as a layer of controlled thickness on a transfer roll rotating above a moving fibrous web but out of touch with the latter while suction is applied below the web in the region of the roll to draw the foam off the roll and into the web. The web is subsequently dried. The process produces webs of improved hand because impregnation is accomplished with only the foam coming into contact with the web.
摘要:
Stable non-aqueous dispersion of water-soluble polymers of extremely high molecular weight coupled with relatively low viscosity and rapid dilutability with water to form a polymer solution are obtained by polymerization of at least one water-soluble .alpha.,.beta.-monoolefinically unsaturated monomer such as acrylamide and dimethyl aminoethyl methacrylate in water-in-oil emulsion with the aid of at least one photo-initiator and UV-light, and azeotropical distillation from water, before or after the addition of a water-soluble wetting agent, to a residual water content of less than 5% by weight, based on polymer. The dispersions are eminently suitable for the preparation of aqueous solution, as retention agents for fillers and water-removal accelerators in the production of paper.
摘要:
Cellulosic materials such as paper are internally sized by treating fibers of the cellulosic material, e.g., paper pulp, with a copolymer of an Alpha , Beta -ethylenically unsaturated hydrophobic monomer and an ammoniated Alpha , Beta ethylenically unsaturated carboxylic acid and a reaction product of epihalohydrin and ammonia. Internal sizing of the cellulosic material by this method can be carried out under acidic, neutral or basic conditions.
摘要:
WATER-SOLUBLE POLYMERS ARE PREPARED BY HOMOPOLYMERIZING 1,1-DIALLYLGUANIDINE OR BY COPOLYMERIZING 1,1DIALLYLGUANIDINE. THE RESULTING POLYMERS ARE CATIONIC AND ARE FLOCCULATING AGENTS. WHEN GLYOXYLATED (BY REACTION WITH GLYOXAL) THEY ARE WATER-SOLUBLE CATIONIC THERMOSETTING WET STRENGTH AGENTS FOR PAPER. WET STRENGTH PAPER CONTAINING THIS POLYMER RAPIDLY LOSES ITS WET STRENGTH ON NORMAL WEATHERING.