30results about How to "Appropriate water absorption" patented technology

The invention relates to a degradable polyethylene modified material and a preparation method thereof. The degradable polyethylene modified material is mainly applied to the production of a disposable degradable plastic bag and is mainly prepared from high-density polyethylene, calcium carbonate, konjac glucomannan, corn starch and a foaming agent. Due to the water retentivity of the konjac glucomannan, the disposable degradable plastic bag prepared from the degradable polyethylene modified material can be maintained in a relative drying state, so that the deterioration and the smelliness of food wastes contained in the disposable degradable plastic bag are difficult to occur. Meanwhile, the disposable degradable plastic bag has stronger toughness due to the addition of the konjac glucomannan, so that the disposable degradable plastic bag is difficult to break. The disposable degradable plastic bag is easy to degrade by taking the konjac glucomannan as a raw material, so that the environment pollution is avoided. The plastic bag commonly used in the existing market is prepared from a single plastic polymer, so that character writing or printing on the plastic bag cannot be carried out. The disposable degradable plastic bag provided by the invention is molded in a blowing manner by using a foaming technique, so that the character writing or the pattern printing on the disposable degradable plastic bag can be carried out.

The invention provides a semi-dull, high-strength, low-elongation viscose fiber and a preparation method thereof. The viscose fiber is prepared by impregnating pulp raw materials, grinding, crushing, kneading, depolymerizing, yellowing, dissolving, and filtering in sequence. , defoaming, ripening, spinning and drawing and post-treatment, the viscose fiber has the following indicators: dry breaking strength ≥ 3.10 cN / dtex, wet breaking strength ≥ 1.60 cN / dtex, 5% elongation in wet state The strength required for elongation is ≥0.55cN / dtex, and the dry elongation at break is 11.0-19.0%. The high-strength and low-elongation viscose fiber involved in the present invention is a new type of fiber achieved through technological innovation. It has an index system different from ordinary viscose fiber and modal fiber, and its products not only show the high-strength, low-elongation fiber characteristics of modal fiber , it also shows stronger skin-friendly properties than cotton fibers, which can effectively replace the existing differentiated viscose fibers. While improving the processing performance of viscose fibers in downstream processes, it can also promote the development and industrialization of downstream new textiles upgrade.

The invention relates to an alpha-alumina carrier used for a silver catalyst and a preparation method thereof. The preparation method includes the steps of: uniformly mixing aluminum oxide trihydrate, pseudo-boehmite, a gallium-containing compound, a silicon-containing compound, a fluorine-containing compound and an alkaline earth metal compound to obtain a solid powder; adding a binder and water to prepare a mixture; and kneading, shaping, drying and roasting the mixture to obtain the alpha-alumina carrier. The invention also relates to the silver catalyst produced with the alpha-alumina carrier and an application of the catalyst for producing epoxy compounds through epoxidation of olefins.

The invention discloses a high-strength viscose fiber and its preparation method and application. The viscose fiber satisfies the following requirements: the fineness range is between 0.80 and 1.50D, the dry breaking strength is ≥3.15 cN / dtex, and the wet breaking strength is ≥1.70cN / dtex, the strength required to produce 5% elongation in a wet state is ≥0.60cN / dtex, and the dry elongation at break is 15.0-19.0%, suitable for textile high-twist fabrics or high-count yarn fabrics. The high-strength viscose fiber involved in the present invention is a new type of fiber achieved through technological innovation. It has an index system different from ordinary viscose fiber and modal fiber. Its products not only show the fiber characteristics of high strength and low elongation of modal fiber, It also shows a stronger skin-friendly property than cotton fiber, which can effectively replace the existing differentiated viscose fiber. While improving the processing performance of viscose fiber in the downstream process, it can also promote the development of new downstream textiles and industrial upgrading .

A method for preparing a rod-shaped alumina carrier and an alumina carrier, comprising the following steps: (1) mixing rod-shaped alumina powder and an extrusion aid; ) on the obtained mixed material; (3) molding the material obtained in step (2), drying and roasting to obtain the final alumina carrier. The alumina carrier prepared by the method of the present invention not only has a relatively firm skeleton structure, but also can uniformly distribute the active components in the pores, that is, exhibits comprehensive properties such as high mechanical strength and suitable water absorption rate, and is especially suitable for use in As a carrier for alkane dehydrogenation catalysts.

The invention provides a semi-dull, high-strength, low-elongation viscose fiber and a preparation method thereof. The viscose fiber is prepared by impregnating pulp raw materials, grinding, crushing, kneading, depolymerizing, yellowing, dissolving, and filtering in sequence. , defoaming, ripening, spinning and drawing, and post-treatment. The viscose fiber has the following indicators: fineness 1.11-1.67dtex, dry breaking strength ≥ 3.10 cN / dtex, wet breaking strength ≥ 1.60cN / dtex, The strength required to produce 5% elongation in wet state is ≥0.55cN / dtex, and the dry elongation at break is 11.0-19.0%. The high-strength and low-elongation viscose fiber involved in the present invention is a new type of fiber achieved through technological innovation. It has an index system different from ordinary viscose fiber and modal fiber, and its products not only show the high-strength, low-elongation fiber characteristics of modal fiber , it also shows stronger skin-friendly properties than cotton fibers, which can effectively replace the existing differentiated viscose fibers. While improving the processing performance of viscose fibers in downstream processes, it can also promote the development and industrialization of downstream new textiles upgrade.

The invention discloses a preparation method for hydrocolloid dressing for promoting wound repairing, belonging to the technical field of medical dressing preparation. The method comprises the following steps: adding AFGF freeze-dried powder into a mixed solution of gelatin and carboxymethyl chitosan, thereby acquiring an AFGF-loaded transparent fluid; mixing with dissolving fluid of the matters including sodium carboxymethylcellulose, apple pectin, and the like; ultrasonically oscillating and then adding a cross-linking agent; performing cross-linking reaction under a certain temperature, acquiring reaction fluid and then mixing with resin viscous fluid, thereby acquiring a spinning solution; spinning by adopting a wet method, thereby acquiring an AFGF-loaded fiber; mixing with a pure cotton fiber and spinning to form cloth. According to the preparation method, the apple pectin is added, so that the water absorption lasting time of the dressing is increased and the gelling is quickened; styrene-isoprene segmented copolymer is added, so that the dressing viscidity and the peeling strength are effectively improved; hydrocolloid is prepared into weaved cloth and no film substrate is required, so that the problem of weak binding force between hydrocolloid and polymer film is solved and the wound repairing can be effectively promoted; the preparation method has wide application prospect.

The invention discloses a preparation method of a new type of regenerated ceramsite, a new type of regenerated ceramsite and its application. The preparation method of the new type of regenerated ceramsite uses sludge, iron tailings, and construction waste as raw materials to replace traditional clay, Shale has prepared a kind of recycled ceramsite. This preparation method uses iron tailings, sludge and construction waste to burn ceramsite. It can control the tailings and sludge problems, and can turn waste into treasure, input new materials for the building materials industry, increase the circular economic benefits of mines, and solve the problem of sludge treatment. It is an effective way for the comprehensive utilization of tailings and sludge, and The prepared new recycled ceramsite has low water absorption, high cylinder compressive strength, good frost resistance and firmness.

The invention relates to an alpha-aluminum oxide carrier, a preparation method, and an application thereof. During preparation of the carrier, a certain amount of a gallium-containing compound additive is added, wherein mass content of gallium in the carrier is 0.02-15.00%. The preparation method particularly includes the steps of: mixing aluminum oxide trihydrate, pseudo-boehmite, a gallium-containing compound and optionally alkaline-earth metal compounds and / or fluorides to prepare a solid mixture; adding a binder and water to the solid mixture to prepare an alpha-aluminum oxide precursor mixture; and kneading, shaping, drying and roasting the precursor mixture to finally obtain the alpha-aluminum oxide carrier. The catalyst carrier can be applied in olefin epoxidation reaction, selective hydrogenation of alkyne and diene, and methane reforming reaction.

The invention discloses a superfine viscose fiber and a preparation method thereof. The superfine viscose fiber is prepared by using a pulp material sequentially through impregnation, grinding, pressing and crushing, kneading, pure oxygen reduced polymerization, xanthation, dissolution, filtration, defoaming, ripening, spinning and drawing and post-treatment. The viscose fiber satisfies conditions that the fineness is 0.88 to 1.11D, the dry fracture strength is higher than or equal to 3.20cN / dtex and the wet fracture strength is higher than or equal to 1.60cN / dtex. The high-tenacity low-elongation viscose fiber disclosed by the invention is a novel fiber type realized through technical innovation and has an indicator system different from common viscose fibers and modal fibers, products made by the viscose fibers not only reflect fiber characteristics of high tenacity and low elongation of modal fibers, but also reflect better skin adaptability than cotton fibers, can effectively replace the existing differential viscose fibers and can promote the development and industrial upgrade of downstream novel textiles on the premise of improving the downstream processing performance of the viscose fibers.

The invention discloses a high-strength low-elongation viscose fiber and its preparation method and application. The viscose fiber satisfies: the fineness range is between 0.80 and 1.50D, the dry breaking strength is ≥3.20 cN / dtex, and the wet breaking strength is ≥ 1.70cN / dtex, the strength required to produce 5% elongation in wet state is ≥0.60cN / dtex, and the dry elongation at break is 13.0-16.0%, suitable for textile high-twisted fabrics or high-count yarn fabrics. The high-strength and low-elongation viscose fiber involved in the present invention is a new type of fiber achieved through technological innovation. It has an index system different from ordinary viscose fiber and modal fiber, and its products not only show the high-strength, low-elongation fiber characteristics of modal fiber , it also shows stronger skin-friendly properties than cotton fibers, which can effectively replace the existing differentiated viscose fibers. While improving the processing performance of viscose fibers in downstream processes, it can also promote the development and industrialization of downstream new textiles upgrade.