107results about "Ageing prevention agents addition" patented technology

The present invention concerns a process for reducing the susceptibility of lignocellulosic material to unwanted yellowing, particularly yellowing caused by light and heat. According to the invention, the fibres are activated enzymatically or chemically and then contacted with a modifying agent capable of bonding to the oxidized fibre material, rendering the lignocellulosic fibre material improved resistance to brightness reversion. By means of the invention, brightness reversion caused by light or heat or a combination thereof can be retarded and even stopped.

The invention relates to a preparation method of sun-screening agent for decorative paper production, and belongs to the technical field of sun-screening agent. The sun-screening agent loaded with nanometer titania is prepared by taking kaolinite, polyethylene glycol and nanometer titania as raw materials, and mixing materials in a desalting water and forming slurry; delivering the slurry to a grinding machine to grind, wherein the grinding process includes preparation of nanometer kaolinite, , dispersion of nanometer titania, and loading of nanometer titania; realizing intercalation and modification of kaolinite by nanometer titania through a mechanical force chemical intercalation process of the kaolinite; then performing dispersing, aging, drying, breaking and other procedures to obtain the sun-screening agent. The preparation process is free from waste water, the technique device is simple and the operation is also simple; the nanometer titania is nanometer TiO2 aggregate for the SCR denitration catalyst carrier; the technical and environment protection problems of preparation of nanometer TiO2 are eliminated, the production process is simplified; the sun-screening agent for decorative paper production can improve the sun-screening and anti-aging performances of the decorative paper.

The invention belongs to the technical field of papermaking, and discloses a method for making manual watercolour paper. The method comprises the following steps that 1, pulping is carried out; 2, gluing in pulp is carried out; 3, the pulp is poured into a container, water is added, and the mixture is fully mixed to be uniform; 4, paper fishing is carried out; 5, wet paper squeezing is carried out; 6, vacuum water absorption is carried out; 7, double rollers are used for embossing; 8, drying is carried out through a drying cylinder; 9, surface gluing is carried out, wherein the surface of dried finished paper is coated with gelatin or polypropylene glue or polypropylene glue, and natural drying is carried out. The manual watercolour paper good in drawing performance, high in ageing resistance and capable of meeting the individual needs of painters is obtained.

Novel substantially odor-free polymeric thiol-containing antioxidant compounds suitable for preventing light induced brightness reversion or yellowing of pulps and papers and polymeric materials are described. The novel compounds are based on a polymeric backbone having thiolactate or thioglycolate groups grafted onto the ends thereof and are soluble in water or alcohol.

The invention discloses a method for reinforcing and deacidifying paper archives. The method comprises the steps of brushing or spraying epoxy chloropropane to to-be-processed paper archives, brushing or spraying cellulose ether stabilized nano-alkaline earth metal hydroxide alcohol-water dispersion liquid, and drying, so as to finish the reinforcement and deacidification of the paper archives; by utilizing an alkaline earth metal hydroxide, the acidy paper archives are neutralized, cross-linking reaction among epoxy chloropropane, paper fibers and cellulose ether is catalyzed under an alkaline condition, cellulose ether which is lined with chemical bonds of the paper fibers and has a cross-linked net structure is formed, and thus the paper archives are reinforced; and the cellulose ether stabilized nano-alkaline earth metal hydroxide is uniformly dispersed into the paper fibers, so that the paper archives are simultaneously reinforced and deacidified. The method has the beneficial effects that the operation is simple, the colors and prints of the acidified paper archives are not obviously influenced, the pH and mechanical strength of the paper archives are remarkably increased, and the durability of the paper archives is improved.

The invention relates to absorptive-type electromagnetic shielding paper and a preparation method thereof. The absorptive-type electromagnetic shielding paper comprises a composite absorbent component and a skeleton component, wherein the composite absorbent component is prepared from the following raw materials in percentage by mass: 12%-48% of nickel powder, 8%-32% of silicon carbide and 20%-80% of ferrite/glass fiber; and the skeleton component is a plant fiber. The absorptive-type electromagnetic shielding paper provided by the invention is capable of absorbing and suppressing secondary reflection clutter, and is high in high-frequency electromagnetic shielding effectiveness, simple in preparation technology and relatively low in cost.

The light stabilizer emulsion composition of the present invention includes: water; an emulsifier; and a light stabilizer and/or a UV absorber, in which components constituting the light stabilizer emulsion composition has an average particle size of 150 nm or less.

The invention discloses antibacterial anti-ultraviolet-ray melamine impregnated paper and a preparation method thereof. The melamine impregnated paper comprises a melamine resin layer, a first anti-ultraviolet-ray urea-formaldehyde resin layer, plain base paper or printing decoration paper, a second anti-ultraviolet-ray urea-formaldehyde resin layer and an anti-bacterial anti-ultraviolet-ray melamine resin layer, wherein the melamine resin layer, the first anti-ultraviolet-ray urea-formaldehyde resin layer, the plain base paper or printing decoration paper, the second anti-ultraviolet-ray urea-formaldehyde resin layer and the anti-bacterial anti-ultraviolet-ray melamine resin layer are sequentially arranged from bottom to top. The preparation method comprises: 1) preparing raw materials; 2) impregnating plain base paper or printing decoration paper with an anti-ultraviolet-ray urea-formaldehyde resin layer; and 3) respectively arranging a melamine resin layer and an antibacterial anti-ultraviolet-ray melamine resin layer on both surfaces of the plain base paper or printing decoration paper treated in the step 2). According to the present invention, the melamine impregnated paper has excellent anti-ultraviolet-ray and antibacterial bactericidal effects; and the decorative plate obtained by gluing the melamine impregnated paper and the substrate has characteristics of wear resistance, scratch resistance, acid resistance, alkali resistance, blanching resistance, pollution resistance, aging fading resistance, good antibacterial effect and long service life.

The invention discloses anti-mosquito environment-friendly wallpaper, made from, by weight, 20-30 parts of used clothes, 10-20 parts of waste wood, 10-20 parts of straws, 2-5 parts of nano zinc oxide, 1-2 parts of chitosan, 2-8 parts of sodium sulfate, 10-25 parts of sodium hydroxide, 5-10 parts of cassava starch, 2-5 parts of butyl acetate, 1-2 parts of titanate coupling agent, 1-3 parts of cationic polyacrylamide, 1-2 parts of sodium cocoyl glycinate, 1-2 parts of azodiisobutyronitrile, 60-100 parts of deionized water, 20-30 parts of ethyl acetate, and 5-10 parts of Chinese herbal powder; the anti-mosquito environment-friendly wallpaper employs the used clothes, waste wood and straws as fiber bases, resources are effectively utilized, resource waste is avoided, and environment protection is achieved; the anti-mosquito environment-friendly wallpaper using the Chinese herbal powder as a plant material can dispel mosquitoes but is harmless to human bodies, and can soothe body and mind and calm the mind since containing nerve-soothing ingredients.

The invention provides a kind of reprintable paper, which is prepared by the following preparation method: pulp is prepared to obtain modulated paper material; the modulated paper material is sequentially formed, pressed, coated and calendered to obtain reprintable paper Paper; the coating solution used in the coating includes solvochromic spiro compound dyes, organic solvents, water and sizing agents. The reprintable paper provided by the invention includes a solvochromic spiro compound dye, which can display desired characters or patterns when exposed to water or an acidic color developer, and the characters or patterns will disappear after a certain period of time, so that the characters or patterns can be reused. Experimental results show that: for the printing paper of the present invention, when water is used as the color developer, the color development time is 10min to 30h; when an acid solution is used as the color developer, the color development time is 30min to 100h. The preparation method of the present invention is simple in process, and can be obtained by adding dyes to the surface sizing step of a mature papermaking process, and the cost is low.

The invention discloses environmental-friendly wallpaper. The environmental-friendly wallpaper is prepared from the following materials in parts by weight: 20-30 parts of old clothes, 10-20 parts of cane trash, 10-20 parts of jute, 2-5 parts of nano zinc oxide, 1-2 parts of polydimethylsiloxane, 2-8 parts of sodium sulfide, 10-25 parts of sodium hydroxide, 5-10 parts of green bean starch, 2-5 parts of butyl acrylate, 1-2 parts of a silane coupling agent, 1-3 parts of cationic polyacrylamide, 1-2 parts of sodium dodecyl benzene sulfonate, 1-2 parts of ammonium persulfate, 60-100 parts of deionized water and 20-30 parts of ethanol. According to the environmental-friendly wallpaper disclosed by the invention, the old clothes, cane trash and jute serve as fiber base materials, the resources are effectively utilized, resource waste is avoided, and an environmental-friendly effect is achieved.

The invention discloses a high breakdown strength transformer insulation paper, which is prepared from the following raw materials by weight part: 12-15 of nano-titanium dioxide, 2-3 of phenolic resin, 500-550 of a pulp board, 1.3-1.5 of sodium silicate, 1-1.3 of sodium carboxymethyl cellulose, 1.3-1.5 of carbon black, 4.4-5 of aramid fiber, 25-30 of bakelite, 0.5-0.7 of pentaerythritol ester of rosin, 0.5-0.7 of butyl methacrylate, and a proper amount of deionized water. The insulation paper provided by the invention has the advantages of long service life, high breakdown voltage, good safety, and good application prospect in transformers.

The invention discloses preparation of a corundum fiber insulating paper for transformers. The corundum fiber insulating paper for transformers is prepared from the following raw materials by weight part: 12-15 of nano-titanium dioxide, 2-3 of phenolic resin, 500-550 of a pulp board, 1.3-1.5 of sodium silicate, 1-1.3 of sodium carboxymethyl cellulose, 2.3-2.6 of corundum fiber, 0.5-0.6 of ammonium polyphosphate, 0.8-0.9 of urea, 0.6-0.8 of hydroxymethyl starch, 0.2-0.4 of polyethylene oxide, and a proper amount of deionized water. The preparation method provided by the invention is simple, the raw materials are low in cost and have wide sources, the prepared insulating paper has good performance and high stability, and has good use prospect as an insulating part of transformers.

The invention belongs to the technical field of special paper, and particularly relates to high-toughness non-woven coated paper and a preparation method thereof. The high-toughness non-woven coated paper comprises, in weight percent, 50-60% of bleached sulfate hardwood pulp, 30-40% of sulfate softwood pulp, 5-15% of polyester fibers, 2-5% of adhesives and 3-5% of auxiliaries, wherein the auxiliaries are mixture of dry strength agents, wet strength agents, dispersing agents, defoaming agents, ultraviolet absorbents and antioxidants. The high-toughness non-woven coated paper is soft, good in folding endurance, uniform in color, stable and compatible and natural in hand feeling, the materials are more environmentally friendly than PVC (polyvinyl chloride), and the use range of decorative paper is widened. The preparation method is simple in process operation and easy to control, product quality is stable, a large number of manpower and material resources are saved, the production processof products is optimized, product quality is improved, the production requirements of users can be more effectively met, and production technology and technical level reach international advanced level.

The invention discloses preparation of a polyimide fiber insulation paper for transformers. The polyimide fiber insulation paper for transformers is prepared from the following raw materials by weight part: 10-12 of nano-titanium dioxide, 2-3 of barium titanate, 2-3 of phenolic resin, 500-550 of a pulp board, 1.3-1.5 of sodium silicate, 1-1.3 of sodium carboxymethyl cellulose, 3-3.5 of polyimide fiber, 2.3-2.6 of polyamic acid resin, 0.4-0.5 of an aqueous wax emulsion, 0.6-0.8 of antimony dioxide, and a proper amount of deionized water. The preparation method provided by the invention has the advantages of simplicity, low cost and wide raw material sources, and the prepared insulating paper has excellent performance, thus being worthy of promotion.