263results about How to "Increase surface polarity" patented technology

The invention discloses a filler masterbatch used for increasing the polarity of polypropylene and a preparation method thereof. The filler masterbatch is characterized by comprising the following components by weight percent: 50%-79% of inorganic filler, 15%-30% of carrier, 5%-17% of polar additive and 1%-3% of processing additive; and the polar additive is one or more of thermoplastic polyurethane resin (TPU), maleic anhydride grafted polypropylene, epoxy resin, ethylene acrylate, ethylene vinyl acetate, polyether amine and polybutylene polyol. In the preparation method of the invention, the added carrier can not improve the polarity of polypropylene, the inorganic filler is used to increase the rigidity of the material; the key is to introduce the polar additive with high unipolarity, thus the filler masterbatch used for increasing the polarity of polypropylene can be prepared; when the filler masterbatch is combined with the polypropylene material for production, the surface polarity of the filled and modified polypropylene material can be increased, the surface energy of the filled and modified polypropylene can be reduced, the dimension stability can be increased, the modified polypropylene material can have good paint adhesion and the material can be used to form exterior trimming parts such as bumpers and interior trimming parts such instrument panels.

The invention provides a polypropylene composite material with high paint adhesion and a preparation method thereof. Through modification of surface polarity of a filler and introduction of a polypropylene modifier, the polarity of polypropylene and the filler is improved, compatibility between polypropylene and the filler is enhanced, and surface polarity of the polypropylene composite material is greatly improved; thus, the polypropylene composite material has excellent paint adhesion and can be applied to spraying and preparation of exterior decoration parts of an automobile. Moreover, the polypropylene composite material with high paint adhesion can be directly sprayed without spraying pre-treatment, so energy is saved and production cost is reduced.

The invention relates to the technical field of a special backing plate for diamond wire cutting silicon wafers in the photovoltaic industry, in particular to a novel special backing plate for photovoltaic diamond wire cutting. The backing plate is prepared from, by weight, 75-95 parts of ABS resin, 5-25 parts of PMMA resin, 5-15 parts of PC resin and/or PBT resin, 1-10 parts of a compatilizer, 1-10 parts of polyvinyl pyrrolidone, 1-10 parts of an adjuvant and 1-5 parts of an adhesion modifier. The backing plate has the advantages that the specific gravity is small, the consumption of manpoweris reduced, the production efficiency is improved, the backing plate does not adhere to diamond wires, the consumption of the diamond wires is reduced, and silicon materials and ABS/PMMA/PC plastic plates are conveniently recovered. By using the backing plate, obvious benefits of reducing the energy consumption and the cost and improving the production efficiency can be brought.

The invention discloses a carbon fiber reinforced polyamide (PA) composite material and a preparation method thereof. The composite material consists of the following components in percentage by mass: 60 to 80 percent of polyamide, 0.1 to 0.3 percent of lubricant, 0.1 to 0.3 percent of antioxidant and 20 to 40 percent of carbon fibers. In the invention, the adhesive bonding property of the carbonfibers and a polarity polyamide resin matrix is improved and the mechanical property of the material is strengthened mainly by carrying out surface treatment on the carbon fibers by liquid polyacrylonitrile. The carbon fiber reinforced polyamide composite material has the advantages that the surface polarity of the carbon fibers is improved; the adhesive bonding property of the carbon fibers and the resin matrix is strengthened; and the obtained carbon fiber reinforced polyamide material has high strength, high toughness and simple production process and can be widely applied to a high-performance structural material for vehicles, military apparatus and aviation.

The invention relate to a modified aramid fiber reinforced PA66 material and a preparation method thereof. The preparation method comprises the steps of modifying the aramid fibers by using microwave radiation, with radiation frequency being 0.5-5 GHZ, radiation dosage being 0.1-2 mW/cm<2> and radiation time being 1-240 s; and then processing the modified aramid fibers by using low temperature plasma, with a processing power being 10-400 W, a processing atmosphere being composed of 5-15% of hydrogen, 5-15% of fluorine and 70-90% of helium, a processing temperature being 0-150 DEG C and a processing time being 1-20 min. The surface layer and the core layer of the aramid fibers modified by the microwave radiation are crosslinked, so that transverse tensile strength of the fibers is increased; and after the low temperature plasma modification, the surfaces of the aramid fibers become rough and are rich in active free radicals and functional groups. The mechanical and wear resistant performances of the composite material prepared by blending and extruding the modified aramid fibers together with the PA66 resin through a double-screw extruder are increased by 15-20% than that of similar products at abroad, and can meet the requirements of the fields such as high speed railways and aerospace for high-performance wear-resistant components.

The invention relates to novel degradable composite plastic, comprising, by weight, 40-60 parts of polypropylene compound, 15-45 parts of micron plant short-staple, 5-15 parts of fillers, 3-7 parts ofcompatilizers, 0.4-0.6 part of antioxidant, 0.3-0.5 part of lubricant, 3-5 parts of antibacterial additives and 2-3 parts of biodegradable agents. Under cooperation of photocatalytic degradation andmicro-biological degradation, the composite plastic has excellent degradation performance, mechanic performance and mechanical property. A preparation method of the novel degradable composite plasticincludes pretreatment, mixing with stirring, mixing with a mixer, extrusion and granulation, cooling and dehydration, and the like. Components of the degradable composite plastic are mixed more dispersively By the preparation method, and thus, quality of the finished product is better.

This invention involves the warp knitting lining production technology, mainly is one silver-plating underwear lining production method. This method includes: A. Relaxes: Relaxes the fabric, causes the fabric full retraction, its internal tensity at the lowest condition; B. Laundering: Washes off on the fabric yarn preparation agent and the greasy dirt; C. Prearranging: Carries on prearranging to the fabric; Its characteristic lies in, d. Fabric calender: Causes the fabric to carry on in the rolling mill calender, improvement warp knitting needle structure distortion; E. Silver-plating: using vacuum ion film plating machine, carries on low temperature plasma processing to the lining to enhance the superficial polarity, this method which use vacuum ion plates continuously carries on the vacuum ion silver-plating to the fabric, enables the silver ion in the fabric surface even distribution, the entire technological process does not have the pollution. This invention provides the method may produce the upscale antibacterial health care warp knitting tension underwear lining, fully displays the silver-plating underwear to the human body health care function.

The invention specifically relates to a preparation method for a composite positive electrode material of a lithium battery, belonging to the technical field of preparation of positive electrode materials of lithium batteries. According to the invention, a nitrogen-containing carbon source is added in situ, so the carbon source containing a non-metal element is added during the preparation of a LiFePO4 material; and after heat treatment, a non-metal doped carbon-coated LiFePO4 composite material is formed. Hydrolysis and precipitation of a titanium source provide an alkaline environment for the polymerization of dopamine, avoid the use of a Tris buffer and prevent troubles caused by centrifugal separation after a reaction and product loss during the centrifugation of products. While polymerization of dopamine without Tris is realized, TiO2 nanoparticles are introduced onto the surface of LiFePO4, and the introduction of TiO2 into the system is beneficial for improving the stability ofthe composite material. The preparation method provided by the invention ensures excellent performance of the prepared material and is simple in preparation process, low in cost and free of product loss.