3115 results about "Pulp (paper)" patented technology

The present invention is one kind of active defoaming composition suitable for eliminating harmful foams under high temperature and strong alkaline condition in high efficiency, and may be used in washing paper pulp, treating metal surface and other fields. The active defoaming composition is prepared with organic siloxane, silicone resin, inorganic oxide particle, hydrophobic treating agent, catalyst and other material. The preparation process includes the following steps: 1. mixing organic siloxane, silicone resin and catalyst, and heating the mixture to 80-200 deg.c for controllable polymerization; 2. adding inorganic oxide particle and hydrophobic treating agent; and 3. further heating to reaction at 80-200 deg.c temperature and 0.01-0.08 MPa vacuum for 2-10 hr, and cooling to room temperature to obtain white polymer as the active defoaming composition.

The invention belongs to the technical field of heated non-combustible cigarettes, and particularly relates to a reconstituted tobacco and a heated non-combustible cigarette prepared by using same. Preparation for the reconstituted tobacco comprises the following steps: firstly preparing a tobacco substrate by manufacturing paper with pulp through a paper-making process; and then, coating spice onto the tobacco substrate, and drying the tobacco substrate to obtain the reconstituted tobacco. The heated non-combustible cigarette prepared by using the reconstituted tobacco comprises a tobacco barrel, cigarette paper packaged outside the tobacco barrel and a composite filter stick connected with one end of the tobacco barrel, wherein a cavity is arranged in the center of the tobacco barrel; a lamellar spacing is arranged between adjacent two layers of the reconstituted tobaccos; the composite filter stick comprises a hollow section and a solid section, wherein the hollow section is in direct contact with the tobacco barrel. The reconstituted tobacco provided by the invention is designed for a heated non-combustible cigarette product, has the advantages of being relatively good in universality and applicability, wide in range of application, capable of simultaneously adsorbing certain harmful substances, capable of meeting physical and mental needs of a consumer, and the like, and has a relatively high practical value and relatively good popularization and application significance.

A preparation technology of a copper-clad laminate based on halogen-free flame-retardant resin compositions comprises the following steps: a fabric glue solution, a glue solution A and a glue solution B are sequentially manufactured; the fabric glue solution is impregnated by 7628 or 2116 glass fabric; solvent is removed in a drying oven to prepare a fabric prepreg; the glue solution A and the glue solution B are sequentially impregnated by wood pulp paper; baking is carried out in the drying oven to prepare a core material prepreg; and finally, two fabric prepregs are respectively pasted on both sides of each of 1-12 core material prepregs, an electrodeposited copper foil is pasted on one side or two sides of each core material prepreg, and the core material prepregs are overlapped and subjected to hot-forming. The copper-clad laminate prepared by adopting the preparation technology has the advantages of low hygroscopicity, high heat resistance, high reliability, high CTI (Comparative Tracking Index), halogen-free and flame-retardant performance, and excellent machinability, and meets the lead-free demand.

The invention relates to filter paper for a cooling system in wire electrical discharge machining (WEDM), which comprises the following components in percent by weight: 18-25 percent of phenolic resin, 0.5-5 percent of glass fiber, 0.5-5 percent of polyester fiber and 65-82 percent of wood pulp fiber. A production method of the filter paper comprises the steps of pulping, pulp mixing, paper making, drying, glue setting and forming. The filter paper adopts the wood pulp fiber as the main material which is matched with a proportion of glass fiber and polyester fiber, so that the bore diameter of the filter paper can be reduced, and the filtering accuracy can be improved; and in addition, since the polyester is chemically-synthesized fiber and has high strength, the bursting strength of the filter paper is improved, and the service life of the filter paper is prolonged. In the production process of the filter paper, thermosetting phenolic resin is introduced by dipping setting glue, and the size stability, the high temperature resistance and the water resistance of the filter paper are further improved. When being applied to a cooling liquid circulating system in WEDM, the filter paper is not deformed or expanded and has good strength in water, and the phenomena of water jetting and black water generating due to bursting are avoided.

A multi-ply absorbent sheet includes at least a first and second ply bonded together. In one construction, the first and second ply are provided with from about 90% by weight to about 25% by weight pulp-derived papermaking fiber and from about 10% to about 75% by weight fibrillated regenerated cellulosic microfiber having a characteristic CSF value of less than 175 ml; the sheet having a caliper of from 180-250 mils/8 sheets and exhibiting a wipe-dry time of less than 20 seconds, an SAT capacity in the range of 350-500 g/m², an SAT rate in the range of 0.05-0.25 g/s^0.5, a CD wet tensile in the range of 400-2500 g/3″ and a wet/dry CD tensile ratio of from 35% to 60%. The multi-ply sheets are efficient, high capacity wipers and have enough absorbent capacity to be used as ordinary paper towels. Preferred wiper towel products exhibit a differential pore volume for pores under 5 microns in diameter of at least about 75 mm³/g/micron.

The invention discloses raw paper of a high-performance environment-friendly paper based friction material and a manufacturing method of a friction plate. The high-performance environment-friendly paper based friction material is characterized by comprising the following components in percentage by weight: a substrate comprises 7-15% of carbon fiber, 5-10% of chopped aramid fiber, 5-10% of aramidpulp and 9-30% of bamboo fiber pulp; a friction agent comprises 10-20% of kieselguhr and 8-12% of cashew nut shell powder; a frictional property regulator adopts 2-4% of rubber particles, 5-10% of calcium carbonate and 10-15% of flake graphite; and a forming adhesive comprises 1-2% of fluororubber, 3-15% of silicone resin and 3-15% of phenolic resin. The invention fully forms the materials of thefriction material into a whole by changing the traditional impregnation process, effectively improves the physical and mechanical properties of the friction plate, improves the friction factors, regulates the dynamic and static friction ratio factors, and reduces the abrasion ratio of the friction plate.

The invention discloses a method for improving the reconstituted tobacco paper-base quality through adding calcium carbonate and a reconstituted tobacco paper-base, belonging to the technical field of cigarette production. The method for improving the reconstituted tobacco paper-base quality through adding calcium carbonate comprises the steps of soaking and extracting tobacco stems and tobacco powder, grinding, pulping, sheet making, squeezing and drying, wherein in the sheet making step, the calcium carbonate and guar gum which respectively occupies 10-70% and 0.05-0.5% of the mass percent of the tobacco raw pulp are added into the tobacco raw pulp. Researches show that after the calcium carbonate and the guar gum are added according to an appropriate proportion, the tensile index, tear index and air permeability of the produced reconstituted tobacco paper-base are obviously improved, the whole water-absorption performance of the reconstituted tobacco paper-base is also improved, the tar yield, CO content and total particle matter content of the sheet paper-base are obviously decreased, so that the tar and harm reduction function of the reconstituted tobacco is better played, the combination property of the tobacco sheet is effectively improved, and the operation performance and effectiveness of a reconstituted tobacco production line are improved.

There is provided a filled paper containing a coated filler obtained by coating a filler with a acrylamide copolymer (composite PAM) comprising (A) an anionic polysaccharide and (B) a cationic and/or an amphoteric acrylamide copolymer. The composite PAM is obtained, for example, by mixing the component (A) and the component (B). Since the filler is treated with a combination of the components (A) and (B) different from each other in charge properties and structure, suitable coagulation effect can be attained and the coated filler has excellent affinity for pulp slurry. Therefore, even in the case of a highly filled paper, a large paper strengthening effect can be attained by using a small amount of the chemical agent.

The invention relates to filter paper of an energy-saving and environment-friendly filter and a making method thereof. The filter paper is made from an energy-saving and environment-friendly ceramic powder material, a silane coupling agent, a dilute, a sizing agent and wood pulp. The filter paper can be made into an air filter and a fuel filter so as to improve the power performance by 6-12%, save the fuel by 2-5% and reduce pollutants in discharged tail gas by 16-47%.

A method of cleaning residue from a surface includes providing a disposable cellulosic wiper including a percentage by weight of pulp-derived papermaking fibers. The pulp-derived papermaking fibers have a characteristic scattering coefficient of less than 50 m²/kg. The wiper also includes a percentage by weight of fibrillated regenerated independent cellulosic microfibers having a number average diameter of less than about 2 microns, and a characteristic Canadian Standard Freeness (CSF) value of less than 175 ml. The microfibers are selected and present in amounts such that the wiper exhibits a scattering coefficient of greater than 50 m²/kg. The wiper is applied, with a predetermined amount of pressure, to a residue-bearing surface, and the surface is wiped, while applying the predetermined amount of pressure, to remove residue from the surface, such that the surface has less than 1 g/m² of residue after being wiped under the predetermined amount of pressure.

The invention relates to a compound air filter material and a method for preparing the same. The composite air filter material used for filter bags comprises a protective layer, a deodorizing layer and a filter layer, wherein the protective layer and the filter layer are compounded on two side faces of the deodorizing layer respectively; the protective layer is made of wood pulp fiber filter paper, spun-bond non-woven fabric or spun-lace non-woven fabric, and the gram weight of the material of the protective layer is 10 to 200g/m; the deodorizing layer is made of one of active carbon, zeolite , sodium bicarbonate, magnesium aluminum silicates and silica gel or a mixture of any two of the wood pulp fiber filter paper, the spun-bond non-woven fabric and the spun-lace non-woven fabric, and the gram weight of the material of the deodorizing layer is 10 to 300g/m; and the filter layer is made of melt-blown non-woven fabric, wood pulp fiber filter paper or SMS non-woven fabric, and the gram weight of the material of the filter layer is 10 to 100g/m. The compound air filter material has high filtration efficiency and deodorization efficiency, low filtration resistance and high dust capacity.

The invention relates to a preparation method of lignin modified phenolic foam, comprising the following steps: modifying high molecular weight lignin in order to degrade into low molecular weight lignin, wherein the activity is improved, replacing the phenol by the degraded lignin, preparing lignin modified resol, mixing with curing agent, foaming agent and surfactant, foaming at room temperature (25-30 DEG C) or in an oven of temperature 40-80 DEG C, finally the modified phenolic foam plastic is obtained after the curing process. The preparation method of the invention has the following advantages: the cost of the phenolic foam is greatly reduced, the toughness of the foam is increased and the brittles is decreased, thus the foam of the lignin modified phenolic foam has good market prospect; the preparation method of the invention provides a high-addition way to the abundant pulp paper-making waste liquid and forestry and agricultural residues, and reduces the dependency of phenolic foam industry on petrochemical raw material phenol.

The invention discloses heating non-combustible cigarette paper and a preparation method thereof. The preparation method of the heating non-burning cigarette paper comprises the following steps: 1) pulping the plant fiber with the length of 0.5 to 4mm, or adding the appropriate proportion of inorganic fiber; 2) adding the inorganic filler in the process of dilution of the pulp, wherein the addition ratio of the inorganic filler is 5 to 50% of the mass of the pulp; 3) sizing the paper to improve water and oil resistance, and cigarette paper is quantified at 50 to 120 g/m<2>. Compared with the existing heated non-combustible cigarette paper that is heated at 350 DEG C, the non-combustible cigarette paper of the present invention has very few yellow stitches, and no tar spots and carbonization, while the entire surface of the existing non-combustible cigarette paper turns yellow, with large tar penetrating and carbonized. In addition, the non-combustible cigarette paper of the present invention is rarely present broken in actual production, and there is almost no deformation and wrinkling after being sucked as the heated cigarette paper.

The invention belongs to the field of material science, and discloses a high-performance graphene/cellulose self-assembling composite hydrogel and aerogel and a preparation method thereof. The preparation method comprises the following steps: (1) firstly soaking cellulose raw materials, then carrying out defibering to prepare paper pulp dispersion liquid; (2) adding graphite oxide to the prepared paper pulp dispersion liquid, and carrying out ultrasonic dispersion to obtain a graphite oxide/cellulose mixed solution; and (3) adding a reducing agent into the graphite oxide/cellulose mixed solution, reducing for 3-24 h at the temperature of 40-100 DEG C, or adopting a hydrothermal reduction method, and washing the obtained product to obtain a graphene/cellulose self-assembling composite hydrogel; and then drying the composite hydrogel to obtain a composite aerogel. Through the simple method, the prepared composite gel is excellent in performance such as electrical conductivity and thermal stability particularly, and is wide in application.

The invention relates to a method and application for a paper-making process reconstituted tobacco sizing agent coated with calcium carbonate. The method comprises the steps that wood pulp fibers, tobacco stem fibers and fragment fibers are used for preparing a sizing agent, then, the sizing agent is soaked into a soluble carbonate solution for 0.5 h to 3 h, and then water is removed through centrifuge dripping; the sizing agent fiber with no water is added into a soluble calcium salt with the calcium ion concentration ranging from 1 mol/L to 3 mol/L, the concentration of the sizing agent is controlled to range from 3% to 10%, and a reaction is performed at room temperature for 3 min to 5 min; in the sizing agent solution, citric acid with the mass concentration ranging from 0.01% to 0.03% is added as a crystal form control agent, and CO2 is led into the solution at the temperature ranging from 20 DEG C to 35 DEG C for a reaction for 0.5 h to 1 h until the pH value of the solution ranges from 7.0 to 7.5, so that a certain amount of nano calcium carbonate coats the surface of paper-making process reconstituted tobacco, and centrifuge dripping is carried out to obtain the paper-making process reconstituted tobacco sizing agent coated with calcium carbonate. The method has the advantages of being easy to implement, high in efficiency and high in application value.

The invention discloses glass fiber air filter paper with high dust holding capacity, which is prepared from alkali-free glass fiber chopped strands and alkali-free glass fiber cotton in the diameter of 0.3-0.4 mu m, as well as an adhesive, wherein the glass fiber air filter paper comprises 3-8 parts by weight of the alkali-free glass fiber chopped strands and 92-97 parts by weight of the alkali-free glass fiber cotton, and the adhesive is a water repellent containing fluorocarbon. The invention further discloses a production process of the glass fiber air filter paper with the high dust holding capacity, and the production process comprises the following steps: firstly beating and dispersing raw material to obtain pulp, then performing wet process forming on the pulp to obtain wet paper, removing water in the wet paper, then performing two-sided sizing on the dehydrated wet paper, and finally drying to obtain a product, wherein the beating degree during beating is 52-56 degrees SR, suction dehydration is performed in three stages, and drying treatment is performed in four stages. The glass fiber air filter paper disclosed by the invention has the advantages of smooth and uniform surface, large specific surface area and dust holding capacity, high mechanical strength and resistance to acid and alkali corrosion.

Disclosed are a novel electron-accepting compound which is a benzenesulfonamide derivative having a specific structure, a heat-sensitive recording material having a heat-sensitive recording layer containing the above electron-accepting compound, a heat-sensitive recording material having a heat-sensitive recording layer containing at least two specific benzenesulfonamide derivatives, a heat-sensitive recording material having a heat-sensitive recording layer containing a benzenesulfonamide derivative and a diphenylsulfone derivatives a heat-sensitive recording material having a heat-sensitive recording layer containing a specific benzenesulfonamide derivative and an ultraviolet absorbent or an aromatic isocyanate compound, and a heat-sensitive recording material having a substrate containing a recycled paper pulp or a non-wood pulp.

These heat-sensitive recording materials are excellent in thermal response, retainability of ground/recorded image, saturation density and retainability of an image portion against light.

The invention relates to electrolytic capacitor paper and a preparation method thereof. Raw paper pulp of the electrolytic capacitor paper is composed of insulation wood pulp, cotton pulp and hemp pulp; at least one of the cotton pulp and the hemp pulp is selected, papermaking is conducted on the cotton pump and/or the hemp pump, and raw paper is prepared by the processed cotton pump and/or hemp pump and the insulation wood pump in a composite mode. According to the technical scheme, high voltage resistant electrolytic capacitor paper is obtained through raw paper production and subsequent coating processing, the high voltage resistant electrolytic capacitor paper is better in strength, soft in hand feeling, good in water-absorbing capacity, low in loss value and excellent in voltage-resistance performance, and the voltage-resistance performance can be increased by over 100 V/mm.

The invention discloses paper pulp made from bamboo fiber, a preparation method of the paper pulp, and a paper product made from the paper pulp and belongs to the field of pulp making and papermaking technology. The whiteness of the paper pulp made from bamboo fiber ranges from 20% to 40% ISO, the tensile index is larger than or equal to 7.9 N*m/g, the folding strength ranges from 15 times to 200 times, the fracture length ranges from 5 km to 10 km, the ash content is smaller than or equal to 1%, the tearing strength ranges from 200 mN to 650 mN, and the beating degree ranges from 10 degree SR to 25 degree SR. The preparation method of the paper pulp made from bamboo fiber includes the steps of raw material breaking, stewing, defibering, defibrination, screening and washing. The paper pulp made from bamboo fiber can be used for making culture paper or paper for daily use. The paper pulp has a good performance parameter, can replace conventional wood pulp and is superior to the conventional wood pulp; the preparation method of the paper pulp has the advantages of being high in yield, easy to operate, convenient to produce, low in cost and environmentally friendly, and the 100% natural features of bamboo fiber are kept.

This invention provides a method for preparing PPTA amide paper including the following steps; adding 20-90% PPTA short fibers, 0-40% PPTA fibril chemical fibers, 1-80% PPTA pulp cakes and scattering aids to scatter them to get sizing materials to be formed on net to be de watered, squeezed and dried to be formed by thermal pressure. The proportion of said components is weight percentage. The paper can be used in structure materials, insulation materials of transformers or motors cellular, heat isolation, flame resistance, filtration and electronic materials.