59 results about "Ammonium perfluorooctanoate" patented technology

To provide a method for producing a melt-processable fluororesin, which is capable of increasing the molecular weight of the fluororesin and preventing coloration of the fluororesin, by using a specific fluorinated emulsifier other than ammonium perfluorooctanoate.

A method for producing a melt-processable fluororesin which is characterized in that a fluorinated monomer is emulsion-polymerized in an aqueous medium containing a fluorinated emulsifier of a formula (1)

XCF₂CF₂(O)_mCF₂CF₂OCF₂COOA wherein X is a hydrogen atom or a fluorine atom, A is a hydrogen atom, an alkali metal or NH₄, and m is an integer of 0 or 1.

An aqueous dispersion of polytetrafluoroethylene (PTFE) comprising from 55 to 70 mass % of PTFE fine particles having an average particle diameter of from 0.1 to 0.5 μm, from 0.0001 to 0.02 mass %, based on PTFE, of a specific C8 fluorine-containing carboxylic acid salt (APFO) such as ammonium perfluorooctanoate, from 1 to 20 mass %, based on PTFE, of a specific nonionic surfactant and from 0.01 to 0.3 mass %, based on PTFE, of a specific C_5-7 fluorine-containing carboxylic acid salt such as ammonium perfluorohexanoate. The aqueous dispersion of PTFE has excellent properties which can form crack-resistant coatings which do not undergo coloration during baking or form problematic ionic impurities by improving the friction stability of aqueous PTFE dispersions even at APFO concentrations without viscosity increase.

The invention belongs to the chemical wastewater treatment field, in particular relates to a method for treating wastewater with low-concentration ammonium perfluorooctanoate through all-film method which combines the ultra microfiltration technology and the nanofiltration technology. The method comprises the following steps: firstly adopting microfiltration or ultrafiltration to remove insoluble particles in the wastewater with low-concentration ammonium perfluorooctanoate; and secondly using a nanofiltration system to concentrate ammonium perfluorooctanoate in the pretreated and clarified wastewater, wherein the nanofiltration system is divided to three levels, each level adopts the concentrated water inner circulation mode to concentrate ammonium perfluorooctanoate to a higher concentration step by step, the permeate of each level of nanofiltration can be directly charged or used as the process water of other processes, and the zero emission of industrial wastewater can be realized. The method of the invention has simple operation, low energy consumption and no secondary pollution; and high-value-added perfluorooctanoic acid can be recycled and the industrial wastewater can meet the direct emission standard or the reuse standard.

The invention is a method of recovering ammonium perfluoro octoate in the teflon resin production by dispersion method, belonging to chemical waste gas processing field, comprising bubbling absorbing, condensing, acidifying, and rectifying and purifying of the exhaust gas from cyclic oven, where the recovered ammonium perfluoro octoate has purity able to be up to 99% and can be reused in dispersion polymerization or other fluorine-containing organic matter intermediates. And the concentration of the ammonium perfluoro octoate in the processed gas is below 11mg/m3 (the highest allowable effluent concentration of fluoride is 11mg/m3), and can completely meet the effluent requirements.

The invention discloses a material with a specific surface structure for preparing a non-sticky pan. The lower surface of the material is planar, the upper surface of the material is concave-convex and is formed by the regular arraying of micron-sized hemispheres in an HCP (hexagonal close packed) manner, and nano-sized hemispheres are respectively distributed on the surface of each micron-sized hemisphere. By adopting the specific surface structure, the material can realize the non-sticky effect, thereby fundamentally avoiding damage and pollution to human beings and the environment by a harmful component namely PFOA (perfluorocaprylic acid) in Teflon used at present for producing the non-sticky pan.

Ammonium perfluorooctanoate—also called APFO, PFOA or C8—is a surfactant associated with the production of Teflon®, and is also present in products such as fire-fighting foams and may be formed from the microbial degradation of grease-resistant coatings applied to items such as pizza boxes. APFO itself does not hydrolyze, photolyze, or biodegrade under environmental conditions and is biologically additive. A process by which APFO may be removed and recovered from water by electrosorption is discovered. Removal and recovery by electrosorption form an inexpensive and environmentally friendly method of removal and recovery of APFO.

The invention discloses a clothing finishing agent and a preparation method thereof. The clothing finishing agent comprises the following raw materials in parts by mass: 20-28 parts of amino silicone oil, 10-15 parts of nanometer titanium dioxide, 0.1-0.2 part of fatty alcohol-polyoxyethylene ether, 0.5-1.2 part(s) of chitosan, 0.05-0.1 part of perfluorooctanoic acid ammonium, and 35-42 parts of water. The clothing finishing agent disclosed by the invention is reasonable in formulation, obvious in sterilization and bacteriostatic effects, capable of effectively inhibiting the growth and reproduction of bacteria on clothes so as to provide healthy and sanitary living environment for people. The clothing finishing agent can enable the clothes to be soft and comfortable, and have relatively strong wearability; the raw materials of the finishing agent are easy to get, and the preparation process is simple and easy to operate, so that the clothing finishing agent can be widely popularized and applied.

The invention belongs to the high polymer field, which provides a production method which is suitable for processing the high molecular weight fluon dispersed resin of the bilateral stretching film. The method adopts emulsion polymerization method to perform the free radical polymerization. The invention is characterized in that high purity tetrafluorethylene monomer is taken as raw material, deionized water is taken as polymerization medium, under the existence of stabilizing agent paraffin, surface active agent fluorine chlorine bromine iodine astatine, initiator peroxide and pH value moderator succinic acid, and under the conditions that the reaction pressure is 2.0 to 5.0 MPa and reaction temperature is at 60 to 107 DEG C, the polymerization is performed to obtain broken emulsion of which the diameter of a primary particle is 20 nanometers and the thickness is 20 to 30 percent; through blending, conglomeration and drying, and fluon resin with average particle diameter of 350 to 650 micron is obtained. The invention has the advantages that the polymerization process is secure and easy to be controlled, the emulsion is stable, the process is advanced, the cost is low, the product performance is good, and the molecular weight reaches 8*10<6> etc; the invention is suitable for processing the bilateral stretching film, also has the advantages that the pore diameter is even, and the pore distribution is good, etc.

The invention discloses dacron textile easy to decontaminate. A water sucking oil repellent resin film is covered on the surface of single fibres of the textile. Residual quantity of perfluor octanoic acid ammonium compound in the water sucking oil repellent resin film is more than 0 and less than or equals to 0.05mu g/g. Residual quantity of perfluor octane sulfonic acid compound is greater than 0 or less than or equals to 0.05mu g/g. Sweat can be absorbed when a person wears clothes made from the dacron textile easy to decontaminate. Oily dirt is prevented from permeating to the inner portion of the fibre. The dirt is removed simply under the condition of the combined effect of a dewatering component and a hydrophilic component. The decontamination ability is good when the dacron textile easy to decontaminate is washed while a detergent is not added at the same time.

The invention provides a method for treating ammonium perfluorooctanoate wastewater. Pump the clear and transparent wastewater containing ammonium perfluorooctanoate into the foam separation tower for foam separation. After defoaming the foam at the top of the wastewater tower, a high-concentration ammonium perfluorooctanoate aqueous solution can be obtained, which can be reused; the aqueous solution of ammonium perfluorooctanoate with a lower concentration is obtained at the bottom of the tower; the foam is separated The ammonium perfluorooctanoate aqueous solution discharged from the bottom of the tower is filtered by the first-stage nanofiltration membrane, the nanofiltration retentate is concentrated, and returned to the foam separation tower for foam separation; the permeate of the first-stage nanofiltration membrane enters the second-stage nanofiltration membrane; the permeate of the second-stage nanofiltration membrane has reached the national wastewater discharge standard; the concentrated solution of the second-stage nanofiltration membrane is returned to the first-stage nanofiltration membrane; the recycling of useful substances in wastewater and waste water cleaning treatment. The invention does not add any chemical agent in the treatment process, does not produce new pollution, achieves zero discharge, and recovers useful substances, and the treatment process is at normal temperature, and the energy consumption is low.

The invention provides a granulating method for filling material powder of thermosetting plastic. The granulating method for the filling material powder of the thermosetting plastic comprises the following steps that (1) thermosetting plastic powder and required filling materials are mixed in a required proportion, and the material temperature is controlled to 0-5 DEG C; (2) a solvent and a surface active agent are added into the mixed materials in the proportion of 1%-10% after being mixed according to the ratio of 100:1 to 1000:1; and (3) the materials added with the solvent and the surface active agent are granulated, compacted, screened and dried. According to the granulating method for the filling material powder of the thermosetting plastic, in the granulating process, the materials are mixed through upper stirring paddles and then mixed again through a rotary mixing tray, afterwards, the raw materials pass through a baffle plate to be mixed for the third time through lower stirring paddles, and thus the requirement for continuous and uniform mixing is met. In the granulating process, deionized water and perfluoro caprylic acid ammonium salt are used as the solvent, consumption of the solvent is low, and the solvent is completely recovered in the drying process, so that the influence of the solvent on the environment is avoided, and the whole process is environmentally friendly.

The invention discloses a method for preparing low pollution and high uniformity PTFE copper clad laminate and a PTFE copper clad laminate thereof. The method consists of the preparation of adhesive tape and the preparation of dielectric layer billets. The preparation of adhesive tape comprises using polytetrafluoroethylene dispersing agent to process dipping and coating once on fiberglass cloth, and then, preparing single coating adhesive tape through drying and baking; the preparation of dielectric layer billets comprises preparing dielectric layer billets comprises by preliminary combining the single coating adhesive tape and the relevant PTFE membrane. The PTFE copper clad laminate comprises a dielectric layer. The dielectric layer comprises a single coating adhesive tape layer and a PTFE membrane layer. The method for preparing low pollution and high uniformity PTFE copper clad laminate and the PTFE copper clad laminate thereof can mitigate the environmental hazards of perfluorooctanoic acid ammonium and lower the energy consumption by significantly reducing the dosage of PTFE dispersing agent.