248 results about "Poly(p-phenylene)" patented technology

The invention relates to a technology for producing poly(p-phenylene benzobisoxazole) (PBO) fibers, and belongs to the field of high performance fiber production. The technology comprises the steps: A, degassing, pre-polymerizing and defoaming; B, post-polymerizing and defoaming; C, spinning and solidifying; D, post-treating; and E, heat-treating and the like. Through optimizing equipment and controlling parameters, a plurality of problems of the prior art are solved. The technological process, equipment cooperation and parameter control of the basic technical scheme are taken as an integral system, are cooperated with each other and are dispensable, materials can be effectively transferred, the scale polymerizing and subsequent scale spinning of the PBO polymer are realized, and a high-quality PBO fiber product is obtained.

The invention relates to a high temperature high pressure bulking dyeing method which comprises dyeing and after treatment. By adoption of the dyeing method of the invention, fibers or textile fabrics like aramid fibers, polysulfonamide fibers, polyphenylene sulfides, polybenzimidazole, poly-p-phenylene benzobisoxazole fibers, phenol formaldehyde resins, fibrilia and so on which have high crystallinity and high orientation degree or high glass transformation temperature can be dyed, and fibers after dyeing have the advantages of evenness, bright colors, high dyefastness, improvement of light fastness and little impact on physical properties.

The invention relates to a method for improving mechanical properties of an aramid fiber in a supercritical fluid through stretching orientation. A supercritical carbon dioxide fluid is utilized for partially destroying interaction of a PPTA (poly-p-phenylene terephthamide) molecular chain in the aramid fiber under the action of certain tension, and the molecular chain is further oriented, so that the aramid fiber with good properties is obtained. The method for improving the mechanical properties of the aramid fiber in the supercritical fluid through stretching orientation mainly comprises the following steps: ensuring that the aramide fiber maintains certain tension in a closed container, introducing CO2 into the container at a certain temperature, so that the internal space of the closed container is in a supercritical CO2 state, carrying out swelling reaction for a period of time, and slowly releasing pressure, thus the highly stretching-oriented aramid fiber is obtained. The method for improving the mechanical properties of the aramid fiber in the supercritical fluid through stretching orientation guarantees that the aramid fiber is in a stretched state in a reaction process, so that orientation degree and crystallinity of a molecular chain are increased while stretching tension is changed, crystal particles are largened, and crystals are more and more complete.

A power transmission belt having a body with a length, a width, an inside, and an outside. The body includes a rubber composition. The body further has a plurality of short fibers in the rubber composition. The plurality of short fibers may include a plurality of poly-p-phenylene benzobisoxazole fibers.

The invention relates to a continuous large-scale production method for p-aramid nanofiber dispersion liquid, and belongs to the technical field of novel polymer materials. A proper aid is added in a process of generating poly-p-phenylene terephthamide (PPTA) through a reaction of p-phenylenediamine and paraphthaloyl chloride, so that the PPTA can directly generate nanofiber instead of random particles under control. Double screws are taken as a main reactor of PPTA polymerization, and an aid damaging molecular molecular aggregation of the PPTA is added into a PPTA polymerization system, so that successful proceeding of a PPTA polymerization process can be ensured on the one hand, interaction between the aid and the PPTA can be accelerated under the strong shear stirring action of a screw element on the other hand, and uniform nanofiber is formed instead of random particles by the PPTA. Moreover, a dispersing process of the nanofiber is finished directly in the screws under the shearing action of the double screws. The method is simple in equipment and is urgent in production links, major reaction and dispersion processes are finished in the double screws, and the production stability and continuity are enhanced greatly.

The invention discloses a filament oil agent for poly-p-phenylene telephthalamide, aiming to solve the problems, such as poor heat resistance, smoothness, adaptability and the like of the oil agent in the prior art. The filament oil agent for the poly-p-phenylene telephthalamide, provided by the invention, comprises the following components: (a) 3-60wt% polyol fatty acid ester, (b) 2-40wt% polyoxyethylene polyol fatty acid ester, (c) 5-40wt% fatty alcohol ethylene oxide-propylene oxide polyether fatty acid ester, (d) 1-20wt% polyoxyethylene alkyl phosphonate, (e) 5-30wt% long-chain fatty alcohol and fatty acid ester, (f) 1-20wt% adhesion property improver and (g) 0.1-5wt% polyether modified silicone oil. The oil agent has the advantages of good smoothness, heat resistance, antistatic property, dyeing uniformity and post processing property.

The invention relates to a method for purifying N-methyl pyrrolidone. The method comprises the steps of (1) washing poly-p-phenylene terephthamide polymers obtained after the polycondensation through deionized water repeatedly to obtain washing liquor containing the N-methyl pyrrolidone (NMP), adding antalkali into the washing liquor to perform neutralizing treatment, and regulating PH of the solution to 6-7; (2) performing extraction separation on the washing liquor to obtain solution with an NMP-extraction agent system on the lower layer and a water-inorganic salt system on the upper layer, and performing secondary extraction on the water-inorganic salt system on the upper layer; and (3) adding an organic solution with an isocyanic acid functional group into a crude product of the NMP, and performing filtering and distillation to obtain the high-purity NMP. By means of the method, the purity of the finally-obtained NMP solvent is remarkably improved, processing procedures are simplified, accordingly, working efficiency is improved, and operability is strong. Furthermore, the purity of the NMP solvent obtained by means of purifying is higher than 99.8%, and the water content of the NMP solvent is smaller than 0.01%.

The invention relates to a method for preparing a poly (p-phenylene-benzobisoxazole) fiber / epoxide resin composite material. The surface modification treatment is performed on the poly (p-phenylene-benzobisoxazole) fiber by using a rare-earth modifying agent, a firming agent is added into the epoxide resin to prepare an epoxy colloid, the treated poly (p-phenylene-benzobisoxazole) fiber is immersed into the epoxy colloid to prepare a prepreg compound, the content of the prepreg compound in the epoxy colloid is controlled to between 35 and 45 percent, and then the composite material is prepared by using the wet method filament winding process. The winding process is performed on a digital control fiber winder, and the prepreg compound is wound on a flat core model to certain thickness and is subjected to solidifying, demoulding, finishing and forming, wherein, the rare-earth modifying agent comprises lanthanum chloride, ethanol, ethylenediamine tetracetic acid, ammonium chloride, nitric acid and carbamide. The method has simple technique and low cost, and does not pollute the environment. The composite material prepared by the technique has good mechanical property.

The invention relates to a strong-strength aramid 1414 filament / flame-retardant cotton fiber blended fabric and a production method for the same. The production method mainly comprises the following steps of (1) impregnating cotton yarns into flame-retardant liquid for wetting, and drying the cotton yarns to produce flame-retardant cotton; (2) combining and twisting poly-p-phenylene terephthamide fiber filaments and the flame-retardant cotton obtained by flame-retardant treatment to form yarns, wherein the degree of twist is ranged from 280T / M to 350T / M, a direction of twist is Z, and the weight ratio of the poly-p-phenylene terephthamide fiber filaments to the flame-retardant cotton is 2:3; and (3) weaving twisted strong-strength aramid 1414 filament / flame-retardant cotton fiber blended yarns as warps and wefts, wherein the density of the warps is 200 to 250 per 10cm, and the density of the wefts is 180 to 220 per 10cm. The produced strong-strength aramid 1414 filament / flame-retardant cotton fiber blended fabric has the characteristics of strong strength, flame retardance, high temperature resistance, high air permeability and moisture permeability, weak static electricity, high wearability and the like.