96results about How to "Lower coefficient of dynamic friction" patented technology

The disclosure relates to a spectacle lens comprising: a lens base member; a multi-layered anti-reflection film placed on the lens base member, and including a layer mainly made of silicon dioxide as an outermost layer; and a water-and-oil repellent layer provided in contact with the outermost layer of the multi-layered anti-reflection film, and made by using, as raw materials: at least one kind of a first fluorine-substituted alkyl group-containing organosilicon compound and a second fluorine-substituted alkyl group-containing organosilicon compound. The disclosure also relates to methods of producing a spectacle lens that is capable of retaining a sufficient water-and-oil repellency over an extended period, and having sufficient edge processability.

The invention provides a method for preparing a trivalent chromium compound. The method comprises the following steps that a hexavalent chromium compound contacts with a reducing agent and a complexing agent under the existence of water, wherein the reducing agent is a substance capable of reducing hexavalent chromium into trivalent chromium; and the complexing agent is a substance capable of having complexation with trivalent chromium ions. When the trivalent chromium compound prepared by the method is adopted as a film forming agent of a galvanized self-lubricating steel plate, an obtained self-lubricating coating has obviously improved fingerprint resistance, corrosion resistance and adhesive force as well as obviously reduced coefficient of dynamic friction.

The iron and steel material treating process with synergistic fluoropolymer coating features the first chemical nickel plating of iron and steel material to form the base layer of the synergistic coating, the subsequent pore creating treatment of the nickel coating, the introducing of fluoropolymer to the pores and surface and the heat treatment under vacuum state for the fluoropolymer to fuse with the chemical coating to form the synergistic coating. The said technological process has the advantages of high coating hardness, high wear resistance, the self-lubricating performance and increased wear resistance caused by the fluoropolymer as friction reducing matter, resistance to most harmful matters of the fluoropolymer, and self-lubricating function of the dry coating.

The invention discloses a fabric type surface texture friction pre-filling type self-lubricating knuckle bearing. The fabric type surface texture friction pre-filling type self-lubricating knuckle bearing comprises an inner ring and an outer ring; a surface texture is machined on the outer sphere face of the bearing inner ring (3) and subjected to self-lubricating material friction pre-filling technology treatment to form a self-lubricating material friction pre-filling surface texture structure; and a layer of fabric self-lubricating material liner is pasted on the surface of the inner sphere face of the bearing outer ring (1). Abrasion to the fabric liner by the edge of the surface texture in the initial stage of friction is avoided to a certain degree, the surface texture is easily full of self-lubricating materials in a friction mode, and the process is simple. The self-lubricating materials pre-filling the textured surface optimize the friction interface material configuration, so that a friction surface transfer membrane is easy to generate, the texture edge cutting effect is weakened to a certain degree, the friction interface has lower static friction coefficient and lower dynamic friction coefficient, and accordingly the service life of the self-lubricating knuckle bearing is greatly prolonged.

The invention relates to a valve seat ring for an alternative fuel engine. The valve seat ring comprises the following chemical components (weight percent): 0.8% -1.2% of C, 0.8% -1.2% of Si, 0. 4% -0.7% of Mn, 0.6% -0.9% of S, 5% -7% of Ni, 4% -6% of Cr, 10% -15% of Mo, 22%-27 % of Co, and the balance of Fe. The valve seat ring is machined by a powder metallurgy method in a vacuum environment, and the production process of two-time pressing and two-time sintering is adopted in the machining process. The valve seat ring has high abrasion resistance, high heat resistance and high corrosion resistance, the good matching of the valve seat ring and a valve is also ensured, and the high-strength valve seat ring material has good machinability, and the excessive machining cost cannot be caused. The content of hard particles reaches about 45%, and the high-strength valve seat ring can meet the requirements of various alternative fuels.

The invention discloses a compound wax microemulsion composition, and a preparation method and an application thereof. The compound wax microemulsion composition comprises the following components inpercent by weight: 8-28wt% of high melting point oxidized polyethlene wax, 4-14wt% of low melting point wax, 1-3wt% of a hyperbranched Gemini surfactant, 0.5-3wt% of a hyperbranched softener, 3-13wt%of an emulsifier, 0.1-1wt% of sodium hydroxide or potassium hydroxide and 50-80wt% of water based on the total weight of the compound wax microemulsion. The compound wax microemulsion can be preparedby a one-step high-temperature emulsification method which is simple in process. The prepared compound wax microemulsion is good in centrifugal stability and diluting stability. By trimming the microemulsion to a textile, the smooth performance of the textile can be improved obviously, the coefficient of kinetic friction of yarns can be reduced, the sewing performance and hydrophilia of a knittedfabric are improved, and yellowing is reduced.

The invention belongs to the field of a polyurethane elastomer and particularly relates to an antifriction modified thermoplastic polyurethane (TPU) elastomer formula as well as a preparation method and application thereof. The formula comprises a component A, a component B, a component C and a component D according to the mass ratio of (95-105):(7-9):(0.04-0.06):(14-16), wherein the component A is a universal type thermoplastic polyurethane elastomer; the component B is a compatilizer; the component C is a vulcanizing agent; and the component D is ultrahigh-molecular-weight polyurethane. Theformual has the following beneficial effects: the ultrahigh-molecular-weight polyurethane with the characteristic of low friction coefficient is used for antifriction and high-temperature-resistant modification of TPU, grafting modification is conducted by adding the compatilizer, the problems that the thermoplastic polyurethane elastomer and the ultrahigh-molecular-weight polyurethane have different polarities and low compatibility are solved, the dynamical friction coefficient of the antifriction modified thermoplastic polyurethane elastomer can be reduced by 43 to 46 percent, the wear ratecan be reduced by 87 to 91 percent and the tensile strength can be increased by 28 to 34 percent.

The invention discloses an injectable decellularized scaffold for cartilage repair as well as a preparation method and application of the injectable decellularized scaffold, and relates to the technical field of medical materials. According to the method, a double-injection mode is adopted, and the gelated gradient injectable decellularized scaffold is obtained by injecting a pre-gel solution and a viscosity modifier simultaneously. The decellularized scaffold can load MSCs to be implanted into a body, is hydrolyzed under a physiological pH value, and slowly releases a medicine at an injured part, so that the differentiation of the loaded MSCs to cartilage cells is promoted, and the injured cartilage tissue is repaired; Due to the gradient property, original biological characteristics of the cartilage tissue can be better simulated, and a better repairing effect is achieved. According to the decellularized scaffold and the technology, the raw materials are cheap and wide in source, after clinical popularization, the pain of a patient can be remarkably relieved, the operation frequency is reduced, the treatment effect is improved, and remarkable social and economic benefits are achieved.

The invention relates to a method for using perfluoroalkyl-containing chain-terminated double-terminal functional group perfluoropolyether for producing single-terminal functional group perfluoropolyether. According to the method, through reaction of a perfluoroalkyl-containing compound, allyl bromide and the dihydroxy-terminal perfluoropolyether, perfluoroalkyl-containing chain-terminated perfluoropolyether allyl ether or the hydroxyl-terminated perfluoroalkyl-containing chain-terminated perfluoropolyether is obtained. Compared with the double-terminal functional group perfluoropolyether rawmaterial, the single-terminal functional group perfluoropolyether raw material produced through the method has more excellent smoothness, lubricity and rub resistance. A molecular chain of the single-terminal functional group perfluoropolyether is of a linear-chain structure, and has excellent flexibility, and an unfixed terminal has a very high degree of freedom after being rubbed.

The invention discloses a bendable protective film for a folding screen and a preparation method thereof. The protective film comprises a first flexible HC processing layer, a bendable base material layer, a second flexible HC processing layer, an anti-rebound OCA optical adhesive layer and a release isolation layer which are sequentially arranged in a stacked mode. The anti-rebound OCA optical adhesive layer is obtained by coating the surface of the second flexible HC processing layer with an anti-rebound OCA optical adhesive and then curing the anti-rebound OCA optical adhesive. The bendableprotective film for the folding screen is excellent in bending resistance, high in light transmittance, low in haze, excellent in scratch resistance and rebound resistance, excellent in bonding strength, relatively good in fingerprint resistance and oil stain resistance, small in dynamic friction coefficient, smooth in surface and relatively good in hand feeling; the bendable protective film canbe well applied to protection of flexible screens and curved screens which require bending performance and have scratch resistance and wear resistance.

The purpose of the present invention is to provide a wet friction material which has a high coefficient of friction, has reduced overall thickness change, and excellent heat resistance (resistance to heat spots).

In order to accomplish the purpose, the present invention provides a wet friction material prepared by impregnating a base material comprising a fibrous substance with a thermosetting resin, and then thermally curing it, wherein the aspect ratio of the fibrous substance is 10 or higher, and the fibrous substance is contained in the base material in an amount of 60 to 75 weight % .

The present invention relates to latex specially for dry process dustless paper and its preparation process, and belongs to the field of special chemical. butyl acrylate, methyl acrylate, ethoxyl acrylate, styrene, acrylic acid and butyl methacrylate as monomers, are added with deionized water, emulsifier, NaHCO3 and initiator to produce branch chain connection to form copolymer. The present invention can meet the requirement of producing dustless paper and is favorable to spraying. The present invention has high fiber combining strength of paper, high dry and wet strength, simple production operation and stable product quality.

The invention discloses an efficient manufacturing technology of a DTY elasticity enhancement addition agent composite material. The efficient manufacturing technology of the DTY elasticity enhancement addition agent composite material comprises the following steps that mineral oil A and mineral oil B are added and mixed in proportion to obtain mixed mineral oil with the viscosity of being 20Pa.s,and then the mixed mineral oil is stirred for 30 minutes under the conditions of normal temperature and normal pressure; a splashing resistant agent, a penetrating agent and a composite material areadded to the stirred mixed mineral oil in sequence, the materials are mixed and stirred, the materials are stirred for 30 minutes under the conditions of normal temperature and normal pressure, and amixed oil agent is obtained; the mixed oil agent is transferred to an intermediate tank and statically placed for 24 hours, and the DTY elasticity enhancement addition agent composite material is obtained; and the DTY elasticity enhancement addition agent composite material is canned, and the canned DTY elasticity enhancement addition agent composite material leaves a factory after the DTY elasticity enhancement addition agent composite material is detected and qualified. The efficient manufacturing technology of the DTY elasticity enhancement addition agent composite material is simple and efficient in technology and reasonable in formula, the manufactured DTY elasticity enhancement addition agent composite material is safe and environmentally friendly and has good smoothness, good antistatic property, good washability and stable storage performance, the splashing problem is solved, the DTY elasticity enhancement addition agent composite material has good usage performance, and the requirement of production can be met.

The invention provides a high performance polypropylene film and a preparation method thereof. The film comprises a top film, a core film and a lower film. The top film includes 2.0-3.0% of a nano-silica composition and 97.0-98.0% of first polypropylene, the core film includes 0.5-2.0% of a nano-silica composition and 99.5-98.0% of second polypropylene, and the lower film includes 3.5-5.0% of a nano-silica composition and 96.5-95% of third polypropylene, wherein the nano-silica composition includes 50-55% of nano-silica particles and 45-50% a resin modifier. Each layer of the film contains a specific content of nano-silica composition, so that the film has high modulus and elongation at break, low diffusion coefficient and solubility parameter to solvent small molecules, low dynamic friction coefficient, and has good comprehensive properties, thus being suitable for flexible packaging materials.

The invention discloses a non-stick coating layer, which is prepared from the following raw materials in parts by weight: 40 to 50 parts of epoxy acrylate, 25 to 32 parts of polyacrylic acid fluorine-containing ester, 25 to 32 parts of poly (vinylidene fluoride-trifluoroethylene), 10 to 15 parts of polytetrafluoroethylene powder, 2.5 to 4 parts of a suspension dispersing agent, 1 to 1.4 parts of aleveling agent and 1.5 to 2 parts of a curing agent. The non-stick coating layer has excellent lubricating performance and excellent non-stick performance, can completely meet the use requirements ofvarious processing molds (such as various plastic demolding, baking molds and papermaking and textile industries), contains no demolding agent (the production efficiency can be improved), and has excellent durability; in addition, no silicone oil is contained, and the product is prevented from being polluted; the adhesive force with a base material is large, the loading capacity is large, the impact resistance is good, the flexibility is good, the comprehensive performance is good, and the service life is long.