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

Production of poly-terephthalic acid glycol ester for improving product tone is carried out by: agitating terephthalic acid and glycol ester by proportioning in size mixed pot, pumping into size feeding pot, size feeding pot entering into esterifying pot by size inject nozzle, circulating by thermosiphon, size mixing reacting, injecting esterified oligomer and additive on pipeline into pre-polymerization pot, material reaching top of pre-polymerization, flowing into terminal-polymerization pot, filtering the product in melt filter, and removing cast heads to dicing cutter. It is characterized by adding blue agent or / and red agent and controlling its content in section 0-1PPM. It achieves low cost and heat energy consumption, and higher product quality.

The invention discloses a method for reducing yellowness of a silver nanowire transparent conductive film through changing plasma resonance intensity. Water / alcohol soluble phenol is added in the conductive ink so as to be combined with the surface PVP of the silver nanowire by forming hydrogen bonds to suppress silver nanowire surface plasma resonance, and thus the yellowness value of the conductive film can be reduced. The protective layer containing the phenolic compound can also be further arranged on the conductive layer to form the hydrogen bonds with the remaining PVP on the surface ofthe silver nanowire so as to further reduce the yellowness value. With application of the method, the b* value of the obtained conductive film is reduced to 0.8 so that the problem of high yellownessvalue of the conductive film can be completely solved, and display has no chromatic aberration if the conductive film is manufactured into the display screen.

The invention relates to polyester production equipment and a polyester production technology, and belongs to the technical field of differentiated preparation of thermoplastic polyester. The polyester production technology comprises the steps of burdening, esterifying and condensation polymerization, adding terephthalic acid and ethanediol to a reaction kettle according to a molar ratio of 1: (1.15-1.5), firstly performing an esterification reaction which comprises first-stage esterification and second-stage esterification, wherein the esterification rate of the first-stage esterification is controlled to be 90-92%, and the esterification rate of the second-stage esterification is up to 96-99%, shifting to condensation polymerization, performing grain-sized dicing on the melt after condensation polymerization, so as to form the finished product. The sliced polyester finished product is excellent in ageing resistance, moisture transmission resistance, weather resistance and the like, and has a good application prospect in the field of the solar backing plate polyester film market.

The process of preparing polyester and copolymer includes the following steps: 1. the ester interchange reaction of dicarboxylic ester or the reaction of dicarboxylic acid with diol to obtain ester oligomer mixture; and 2. the further polycondensation in the presence of polycondensation catalyst. It features the polycondensation catalyst comprising homogeneous diol solution of Ti-Si catalyst. The homogeneous catalytic reaction has simple mass transfer process, raised mass transfer efficiency, raised catalyst activity and selectivity, raised polyester product quality, lowered product b value and shortened polycondensation time.

The invention relates to a method for preparing semi-dull and full-dull titanium polyester through adding titanium dioxide, and solves a problem that titanium dioxide used as a delustering agent in the prior art has an inhibition effect on the activity of titanium polyester catalysts. The method comprises the following steps: adding titanium dioxide used as the delustering agent to raw materials comprising terephthalic acid and ethylene glycol, carrying out an esterification reaction in the presence of a liquid titanium polyester catalyst, and carrying out a pre-polycondensation and polycondensation reaction under vacuum conditions to obtain the polyester product, wherein the liquid titanium polyester catalyst is a product prepared through a reaction of titanate, polyol, sulfonate and an alkaline metal compound, a molar ratio of titanate to polyol is 1:1 to 1:10, a molar ratio of titanate to sulfonate is 20:1 to 5:1, and a molar ratio of titanate to the alkaline metal compound is 10:1 to 2:1. The method allows semi-dull and full-dull titanium polyester with superior performances to be obtained, and can be used in practical industrial production of polyester.