12results about "Dispersing agents addition" patented technology

The present invention includes surface-interactive utensils comprising a foamed material that includes a simple nanocellulose element (NCE)-based matrix comprising redispersed or redispersible NCEs or a composite NCE-containing matrix comprising redispersed or redispersible NCEs. The invention also includes methods of manufacturing such utensils.

The application discloses a kind of pure para aramid paper based on nanofiber hydrogel and its integrated preparation method, belong to high-performance fiber paper-based material technical field.The application first utilizes pressurized CO2 method to induce aramid fiber gelation, and realizes efficient in-situ extraction and closed-loop recovery of dimethyl sulfoxide (DMSO) solvent by pre-position mechanical pressure filtration, then water washing is prepared to keep high hydration activity nanofiber hydrogel slurry.In the process of papermaking, the hydrogel slurry is used as the only functional medium in the system, and is co-dispersed with homogeneous para aramid short fibers, relying on the high-density hydrogen bonding between isomorphic molecular chains, realizing the dense in-situ coating of nanofiber on the surface of short-cut skeleton.The application avoids the dependence on heterogeneous binder or chemical dispersant in conventional process, under very low solvent recovery energy consumption, constructs the pure para aramid cooperative structure of nanophase-macroscopic skeleton penetrated by continuous three-dimensional hydrogen bond network, realizes the effective unity of pure aramid paper in the premise of lightweight high modulus and high tear toughness, provides technical support for large-scale green manufacturing.

The application discloses a method for improving the uniformity of pulp molding, which comprises the following steps: a pulp pretreatment step, an electrostatic adsorption forming step, a wet blank transferring and pre-dewatering step, a hot-pressing setting step and a post-treatment step. The method can significantly improve the thickness uniformity of the pulp molding product, greatly reduce the fiber loss rate, effectively inhibit narrow-site pulp holding, improve the efficiency, and improve the precision and performance of the product.

The application discloses a web composite forming method for improving the interlayer bonding strength of boxboard, and comprises the following steps: step one, pulp property detection and grading control, step two, white water pretreatment and intelligent dilution water concentration adjustment, step three, pulp pre-dispersion and chest roller shaking forming, step four, composite surface micro-roughening treatment of the wet paper web, step five, interlayer modified starch atomization spraying, step six, multi-layer wet paper web compounding and bonding dryness control, step seven, stepwise vacuum dewatering, and step eight, wet paper web setting and subsequent conveying; the application realizes accurate adaptation of each process link to the pulp property, eliminates the uneven forming problem caused by the pulp property fluctuation from the raw material end, lays a uniform forming foundation for the improvement of the interlayer bonding strength, simultaneously effectively disperses the fiber flocculation group through pre-dispersion treatment, reduces the fiber longitudinal arrangement, makes the fiber distribution in the paper web more uniform, and improves the effectiveness of the interlayer fiber entanglement.

The present application relates to the field of aqueous functional dispersion, disclose a kind of high solid low bubble calcium stearate aqueous dispersion and its preparation method, the aqueous dispersion includes calcium stearate 40~55 parts, deionized water 43~58 parts, emulsifying system 2.5~5.5 parts, dispersant 0.25~2.5 parts, no silicon defoamer 0.15~1.0 parts, viscosity reducing aid 0.5~2.5 parts, bactericide 0.1~0.5 parts by mass parts;Emulsifying system includes branched low bubble type fatty acid methyl ester ethoxylate sodium sulfonate, Span 60 and Tween 20.The present application is carefully selected and designed dispersant and auxiliary stabilizer, so that calcium stearate particles realize long-term stable suspension in aqueous system, avoid settlement and stratification, with excellent storage stability.Solve the problem that calcium stearate is easily aggregated, settled and foamed in aqueous system in the prior art.

The application provides a method for preparing a gamma-ray protection aramid paper by using waste aramid 1313, and belongs to the technical field of radiation protection material preparation. The waste aramid 1313 is pretreated and fibrillated and cut to obtain regenerated aramid 1313 short fiber slurry; bismuth tungstate powder is prepared by a hydrothermal reaction and mixed with metal gadolinium powder to obtain a composite shielding powder; the composite shielding powder is added into water-based polyurethane emulsion to be modified to obtain modified composite shielding powder; the regenerated aramid 1313 short fiber slurry, aramid fibrid fiber and the modified composite shielding powder are mixed to obtain a protection aramid paper pulp, and the product is obtained through wet papermaking, dehydration, pre-drying and hot pressing and setting. The application turns waste into treasure, utilizes the fibrillated structure of the regenerated fiber and the synergistic crosslinking effect of the water-based polyurethane to enhance the powder combination firmness, utilizes the complementary elimination of the weak radiation absorption area of multiple elements to eliminate the weak radiation absorption area, and improves the overall shielding performance and folding resistance of the aramid paper.

The application discloses a kind of insulation paper for formation cabinet and preparation method thereof, insulation paper for formation cabinet includes the following components according to mass percentage: 22~30% meta-aramid short fiber, 20~34% PEN short fiber, 32~41% Co-PET / PET sheath-core type bicomponent short fiber, 5~12% aqueous phosphate modified epoxy resin emulsion, 0.7~1.5% wet strength agent, 0.5~1% dispersant.The insulation paper prepared by the preparation method of the application has good high-temperature resistance, insulation, flame retardance, chemical stability and thickness uniformity, and has certain tensile strength and wear resistance, low impurity content, and is not easy to produce dust.

This invention discloses a halogen-free flame-retardant paper for archival use and its integrated preparation method. Through in-situ synthesis of flame retardants, compound modification, pulp addition + impregnation composite papermaking, and continuous deep processing of archival supplies, a complete integrated production chain is achieved, from chemical raw materials to finished archival equipment. The paper produced by this invention is halogen-free and low-smoke, has an oxygen index ≥30%, is acid-free and aging-resistant, does not shed dust, does not yellow, and is self-extinguishing upon removal from flame. It is suitable for archival storage in archives, government agencies, and enterprises. The product is registered under the trademark "Ji Lu" and has advantages such as high safety, long lifespan, low cost, environmental stability, and high brand recognition, making it widely applicable in the field of archival equipment manufacturing.

The present invention specifically relates to a preparation method for aramid fiber filter paper, comprising the following steps: step (1), adding aramid pulp fibers into a dispersion in multiple portions and subjecting same to dispersion treatment to obtain aramid fibers with graded size distribution, wherein the dispersion comprises a dispersant, a strong base and a solvent; step (2), mixing the aramid fibers with graded size distribution with water, and performing high-speed mechanical stirring to obtain a slurry of aramid fibers with graded size distribution; and step (3), processing and forming the slurry of aramid fibers with graded size distribution into shape to obtain aramid fiber filter paper. The present invention also relates to aramid fiber filter paper and an application thereof. The aramid fiber filter paper of the present invention has high filtration accuracy and low filtration resistance, and can be used as a hierarchical composite material.

This invention provides a thin, lightweight para-aramid paper, its preparation method, and its applications. The para-aramid paper prepared by this method has a basis weight of 5-30 g / m³. 2 The thickness is 0.01~0.04 mm. This method first prepares pulp A and pulp B, which are then processed to obtain the finished para-aramid paper. Pulp A directly uses oil-free para-aramid short fibers, avoiding the washing process of oily short fibers and reducing secondary pollution and wastewater disposal caused by washing oily short fibers. Pulp B uses specific types of nanofibers, and a binary retention aid composed of CPAM and ACPAM is added to these nanofibers. This facilitates the formation of micro-floc structures by the nanofibers, thereby improving the retention rate and filtration speed of the nanofibers, enabling continuous production of para-aramid paper. The addition of the aid enhances the hydrogen bonding between the nanofibers and chopped fibers, improving paper uniformity and thus increasing paper strength.

The application discloses a WF / RCF / HGM composite fiber felt and a preparation method thereof, and belongs to the technical field of high-temperature thermal insulation materials and composite fiber materials. The composite fiber felt takes ceramic fibers as a main thermal insulation framework, wood fibers enhance the bonding strength between fibers, and hollow glass microspheres are uniformly dispersed in the fiber network to reduce the overall thermal conductivity. The mass ratio of the wood fibers to the ceramic fibers is 1:1-1:6, the addition amount of the hollow glass microspheres is 1.0%-15.0% of the dry weight of the mixed fibers, and dispersants, forming aids and binders are further added. The preparation method comprises the steps of hollow glass microsphere pre-dispersion, composite fiber slurry preparation, wet web forming and drying forming. The composite fiber felt prepared by the application has the characteristics of high strength and low thermal conductivity, the preparation process is simple and controllable, is suitable for large-scale production, and widens the application range of the ceramic fiber felt in the high-end thermal insulation field.

The application relates to the technical field of heat-permeable polymer materials, and discloses a preparation method of fluorine-containing PBO nanofiber paper with heat conduction and wave permeability, which comprises the following steps: obtaining fluorine-containing PBO precursors through a co-condensation reaction; diluting the fluorine-containing PBO precursors with an organic solvent to obtain a precursor solution, and then putting the precursor solution into high-speed stirring deionized water, collecting solid phases through suction filtration to obtain precursor nanofibers; dispersing the precursor nanofibers in an alcohol dispersant to obtain a dispersion liquid, collecting solid phases through suction filtration, and then performing heat treatment after cold-press drying to obtain fluorine-containing PBO nanofiber paper with heat conduction and wave permeability. The preparation process is simple, the prepared fluorine-containing PBO nanofiber paper with heat conduction and wave permeability has excellent heat conduction performance, low dielectric constant and excellent tensile strength.