46results about How to "Lower b value" patented technology

A nonwoven fabric of polyester composite fibers which has a satisfactory color tone (low value of b*). It is formed from short composite fibers obtained from a polyester polymer obtained with the following catalyst and a fusion-bondable polymer. The catalyst comprises: (1) a mixture of a phosphorus compound ingredient comprising a phosphorus compound represented by the formula (III) with a titanium compound ingredient comprising a titanium alkoxide represented by the following formula (I) and/or a product of the reaction of the titanium alkoxide with a carboxylic acid represented by the formula (II) or anhydride thereof; and/or (2) a product of the reaction of a phosphorus compound ingredient comprising a phosphorus compound represented by the formula (V) with a titanium compound ingredient comprising a titanium alkoxide (IV) represented by the formula (IV) and/or a product of the reaction of the titanium alkoxide with a carboxylic acid represented by the formula (III) or anhydride thereof.

The invention discloses a flame-retardant polyester fiber and a production method thereof; the flame-retardant polyester fiber is obtained by mixing and spinning flame-retardant copolymerization master batch and common polyester; the flame-retardant polyester fiber has a phosphorus content of 5000-7500 ppm, has excellent flame retardancy, a good color, a high melting point, superior heat resistance, and low cost, and is widely applicable to decoration material fields such as curtains, carpets, and materials and equipment in vehicles.

The invention relates to a transparent conductive film, which reduces the b* value of the conductive film by adding a coloring agent and improves the transmittance of the conductive film. The invention provides a transparent conductive film aiming at the technical problems that the color of the film material will be discolored and the visibility will be poor due to the coating of the conductive paste in the prior transparent conductive film. The transparent conductive film comprises a transparent carrier, a conductive layer and a protective layer sequentially coated on the transparent carrier;The protective layer consists of an acrylic resin, a mixed solvent and a dye. According to the CIE Lab* color model (Lab*), based on the human perception of color, the coloring agent corresponding tothe color of the conductive layer is added to the protective layer to compensate the visual effect of discoloration and improve the transmittance of the conductive film.

The invention discloses a titanium-silicon catalyst and a preparation method as well as an application thereof. The preparation method includes the following steps: (1) organic titanic acid ester and 2/3 cubic content of anhydrous alcohol are mixed evenly, and stirred sufficiently to achieve A solution; deionized water is mixed with the remained 1/3 cubic content of anhydrous alcohol sufficiently, acid or alkali is added, the acid or alkali concentration is controlled within 0.01-1mol/L, B solution is prepared, and B solution is dripped into A solution by a burette; (2) the mixture is stirred for 3-5 hours after dripping, the precipitate achieved after centrifugal separation is grinded and calcined to achieve titanium-silicon catalyst. The titanium-silicon catalyst achieved by the method is stable during the process of polymerization without hydrolysis reaction; the method can be used to catalytic synthesis of aliphatic and aromatic co-polyester, the titanium-silicon catalyst can reduce the dosage of catalyst, shorten the duration of polymerization, improve the quality of biodegradation co-polyester product, and the terminal carboxyl group content in the product as well as the b value are reduced.

The invention discloses a method for manufacturing directly-spun PET (polyethylene glycol terephthalate) polyester staple fibers by the aid of titanium catalysts. The method includes steps of continuously adding the titanium catalysts blended in EG (ethylene glycol) during esterification reaction and pre-polycondensation reaction by the aid of direct spinning processes; adding ultraviolet transforming agents, phosphorus stabilizers and extinction agents; carrying out final polycondensation reaction, direct spinning and afterfinish to obtain the directly-spun PET polyester stable fibers. The method has the advantages that the titanium catalysts are simultaneously added in esterification reaction and polycondensation reaction working procedures by the aid of the direct spinning processes, bis-styrene heterocyclic ring compounds which do not participate in polyester synthetic reaction but can effectively convert ultraviolet rays into blue visible light are added in the esterification reaction and polycondensation reaction working procedures, the phosphorus stabilizers are added simultaneously, accordingly, the temperatures can be reduced by 1-5 DEG C in the integral reaction procedures as compared to antimony catalysts, the addition amounts of the titanium catalysts can be reduced, apparent color values b can be reduced, and the mechanical performance of the stable fibers can be improved.

A Ti-series composite catalyst for the polycondensation reaction in synthesizing polyester and copolyester is prepared from isopropyl (or tetrabutyl) titanate, a compound of the element in IVA family and the compounds of 1-3 metal elements chosen from IA, IIA, IIIA, IIIB, VIIB and VIII families through alkaline hydrolysis and deposition. Its advantage is high activity.

The invention discloses a method for improving visual whiteness of blanching chemimechanical pulp. The method comprises the following step of: adding 5-120 ppm of water-soluble dyestuff in a blanch process of a pulp line, a blanch full stuff process or a full stuff tower, wherein the dyestuff is amaranth dyestuff, blue dyestuff, purple dyestuff, bluish violet dyestuff, red dyestuff, a mixture of purple dyestuff and red dyestuff, a mixture of the amaranth dyestuff and the red dyestuff, the mixture of the amaranth dyestuff and the bluish violet dyestuff, or the mixture of the purple dyestuff and the blue dyestuff. The method provided by the invention has the advantages that through the dyestuff added in the blanching chemimechanical pulp, the yellow phase value is reduced, the a * value of pulp is also increased, a b* value is reduced, the whiteness of the full stuff is improved, in addition, the additive amount of a blanching chemical in the stuff is also reduced, and the cost is effectively reduced. The invention also provides the blanching chemimechanical pulp prepared by the method.

The invention relates to a method for preparing environment-friendly polyester, and belongs to the field of polymer materials. The method adopts dicarboxylic acid and dihydric alcohol as raw materials, titanate as a catalyst and nano-titanium nitride as an additive, and comprises the following steps: performing esterification; performing polycondensation; extruding, granulating and drying througha melt pump to obtain the environment-friendly polyester. In the polymerizing process, titanium nitride has the effect of a co-catalyst, the polycondensation can be improved by over 20 percent. The bvalue of the novel modified polyester is reduced by 6 unit and more in comparison with that of conventional titanium series polyester.

The present invention provides a decorative-material-attached substrate having a white colored layer and a light blocking layer, and for which the b value of the white colored layer after high temperature processing is small. This decorative-material-attached substrate has in the following order a substrate, the white colored layer, and the light blocking layer. Both the white colored layer and the light blocking layer include a resin having a siloxane bond in the main chain.

The invention relates to polyesteramide as well as a preparation method and application thereof. The method comprises the following steps: mixing terephthalic acid dihydric alcohol ester and a diaminedibasic acid derivative, and then carrying out condensation polymerization to obtain the polyesteramide, the end group of the diamine dibasic acid derivative is carboxyl, and is prepared by reactionof A and B, A is diamine dibasic acid salt, B is dibasic acid, and the dibasic acid in the A is the same as that in the B; the structural formula of the prepared polyesteramide is as shown in the specification, in the formula, R1 or R2 is-OH or-O (CH2) yOH, the value range of y is 2-8, the value range of m is 4-8, the value range of n is 4-10, and the value range of X is 20-80; the application isas follows: spinning the polyesteramide to obtain polyesteramide fiber. According to the preparation method, the problem of yellowing of the polyesteramide can be effectively avoided, the prepared polyesteramide has a low b value, and the color of the polyesteramide fiber prepared through spinning processing is good.

The invention discloses a white photosensitive film, and a preparation method and application thereof. The white photosensitive film comprises a white inorganic filler, alkali-soluble resin, light-cured resin, a photoinitiator, heat-cured resin, a curing agent and an antioxidant; and the curing agent is an anhydride curing agent. A white photosensitive film formula is used to form a coating liquid, a carrier film is coated with the coating liquid, and the carrier film is heated and baked to obtain the white photosensitive film. According to the white photosensitive film, the formula is improved, and by adding the anhydride curing agent and the alkali-soluble resin with the side chain and/or the tail end containing a carboxyl group, the prepared white photosensitive cover film can meet therequirements of an existing product in the aspects of development precision, high temperature resistance and the like; and the cured film is low in b value and high in reflectivity.

The invention relates to a regenerated PTT polymer and a preparation method and application thereof. According to the preparation method, the recycled PET is used as a raw material, DMT is prepared through alcoholysis and transesterification, polymer conversion is achieved through transesterification, recycling of waste PET resources is achieved, new polymer PTT is manufactured through conversion, and the method is safe, non-toxic, green and environmentally friendly; after refined DMT and PDO are subjected to transesterification, a catalytic system compounded by a titanium catalyst and a plurality of metal ion solutions is used as a catalyst in a PTT polymerization process, so that effective balance between rapid reaction and product quality is achieved, the quality stability in the production process is controllable, and compared with a pure titanium catalyst, the method has the advantages that the yield is high; according to the preparation method, the inhibition effect on side reactions is obviously improved, and the B value is obviously reduced. The PTT polymer finally prepared by the preparation method disclosed by the invention is relatively narrow in molecular weight distribution, few in side reaction products and good in quality, can be used for preparing fibers, films or engineering plastic products, and has a great application prospect.

Provided is a thermoplastic resin including constituent units represented by general formula (1). (In formula (1), R1 and R2 each independently represent: a hydrogen atom; a fluorine atom; a chlorine atom; a bromine atom; an iodine atom; a C1-6 alkyl group; a monocyclic or polycyclic C6-36 aryl group; a monocyclic or polycyclic heteroaryl group having 5-36 ring atoms, 1, 2, 3, or 4 of the ring atoms being selected from nitrogen, sulfur, and oxygen, and the other ring atoms being carbon in the heteroaryl group; a C2-6 alkenyl group; a C1-6 alkoxy group; or a C7-17 aralkyl group. In formula (1), X, a, and bare each as described in the present specification.)