36results about How to "Less prone to curling" patented technology

Disclosed is an optical laminate which is prevented from occurrence of curling (warping), while maintaining adequate pencil hardness and having excellent durability. The optical laminate is capable of preventing decrease in durability of an image display screen due to the outside light when used as a protection film for the image display screen. Specifically disclosed is an optical laminate in which at least a hard coat layer is formed on a light-transmitting substrate. The optical laminate is characterized in that: the hard coat layer is obtained by curing a composition for the hard coat layer containing a polyfunctional ultraviolet-curable (meth)acrylate resin, an ultraviolet absorbent and a photopolymerization initiator by irradiation of ultraviolet light; the hard coat layer has a Martens hardness (A) of 230-320 N / mm2 in a surface that is on the reverse side of the light-transmitting substrate-side surface; the light-transmitting substrate-side surface of the hard coat layer has a Martens hardness (B) of 160-250 N / mm2; the Martens hardness (A) is larger than the Martens hardness (B); and the elastic modulus of the hard coat layer is continuously changed in the thickness direction.

The invention discloses a kind of hydrophobic association polyacrylamide and its preparative method. The product is the copolymer of acrylamide and dendritic I branch-like hydrophobic monomers, in which, the amount of monomeric unit of acrylamide is integer of 124013~139860, the amount of monomeric units of dendritic hydrophobic monomers is integer of 140~6527. In the invention, high degreed branching hydrophobic monomers are inlet on a chain of macromolecules by the way of micelles' copolymerization, the monomers can promote the capability of hydrophobic interaction of polymers' chain without any curling for its greater hydrophobic volume, so a better viscosity can be achieved. The content of the hydrophobic chain can be controlled by the way of controlling the amount of hydrophobic monomers to improve the solubility of copolymer

The invention discloses a high-safety self-stabilizing skateboard for ski training, which belongs to the field of ski training. A high-safety self-stabilizing skateboard for ski training is provided with a plurality of elastic curly self-stretching airbags, which can be used during the skiing process. In the process, air can be quickly poured into the self-expanding airbag, so that the self-expanding airbag is deployed. When the self-expanding airbag is fully deployed, under the action of air extrusion, the self-extending interlayer gradually stretches out from the self-expanding airbag, making the self-expanding airbag Adjacent multiple magnetic hairs gradually approach each other, and finally attract each other, so that multiple self-stretching airbags are integrated to form self-maintaining and stable wings. Compared with the existing technology, it can significantly increase the stability of the ski when it is vacated, effectively ensuring The personal safety of beginners reduces potential safety hazards. At the same time, when landing, the air overflowing from the self-stretching airbag can buffer the falling of the skateboard, thereby improving the stability when landing and further ensuring safety.

The invention relates to an acrylamide monomer and a preparation method. The method comprises the following steps: contacting styrene, a sulfonating agent and acrylonitrile for 1-4 hours under -5-15 DEG C to obtain the acrylamide monomer. The invention also relates to the acrylamide copolymer, a preparation method and an application. The preparation method comprises the following steps: under the condition of a solution polymerization reaction, under the existence of an initiator, a monomer mixture is performed with polymerization, the monomer mixture contains acrylamide and a monomer C, and the viscosity-average molecular weight of the obtained after polymerization is more than 30 million by the condition of the solution polymerization reaction. The acrylamide copolymer is capable of resisting high temperature, and has good viscosifying effect under high ore degree, can be widely used in petroleum chemical field, and can especially be a displacement agent for three-time oil extraction oil.

The invention provides a brominated SBS product with a narrow molecular weight distribution and high thermal stability and a preparation method thereof, comprising the following steps: mixing, dissolving, adding dropwise, terminating the reaction and separating, and extracting; said mixing, TBAB and Br 2 The mixture 25.64g and DCM 100g are mixed, obtain material; The TBAB and Br 2 The mol ratio is 1:1, the obtained brominated SBS product of the method of the present invention, 1% thermogravity loss temperature is 230 ℃, 5% thermogravity loss 245 ℃, 10% thermogravity loss 255 ℃, 50% thermogravity loss 280 ℃, bromine The content is 66%. The preparation method of the present invention has stable and easy-to-obtain raw materials, simple process, easy operation, and low cost, which is conducive to popularization and application, and can effectively reduce or eliminate the content of polymers and ultra-high molecular polymers in the copolymer , greatly improving the purity of brominated SBS products, and improving the comprehensive physical and mechanical properties of brominated SBS copolymers.

The invention relates to an acrylamide monomer and a preparation method, the method comprises the following steps: contacting 3-methyl-2-butylene, a sulfonating agent and acrylonitrile for 1-4 hours under -5-15 DEG C to obtain the acrylamide monomer in a formula (I). The invention also relates to the acrylamide copolymer, the preparation method and the application. The preparation method comprises the following steps: under the condition of a solution polymerization reaction, under the existence of an initiator, a monomer mixture is performed with polymerization, the monomer mixture contains acrylamide and a monomer C, the viscosity-average molecular weight of the obtained after polymerization is more than 30 million by the condition of the solution polymerization reaction. The acrylamide copolymer is capable of resisting high temperature, and has good viscosifying effect under high ore degree, can be widely used in petroleum chemical field, and can especially be a displacement agent for three-time oil extraction oil. (img file='DDA00002332890900011.TIF' wi='747' he='220' / ) is formula (I).

The invention relates to a preparation method of a high-temperature-resistant high-salt polymer oil-replacement agent, which comprises the following steps: dissolving 10-20 parts by weight of anionic monomer, 50-65 parts by weight of sodium allylsulfonate, 11-22 parts by weight of cationic monomer, 2-4 parts by weight of acrylate, 0-3.5 parts by weight of alpha-alkene and 50-60 parts by weight ofacrylamide in deionized water, wherein the total mass concentration of the monomers is 15-23%; adding a surfactant which accounts for 1-5% of the total weight of the monomers, regulating the pH valueof the solution to 9-10, introducing ammonia gas at 30-60 DEG C for 30 minutes, and adding a persulfate initiator which accounts for 0.05-0.1% of the total weight of the monomers; and reacting at 30-60 DEG C for 12 hours, precipitating with acetone, washing, and carrying out vacuum drying to obtain the white powdery polymer. The invention is characterized in that long-carbon-chain alkyl group, anionic and cationic unit structures are introduced into the water-soluble polymer macromolecules to obtain the high-temperature-resistant high-salt water-soluble polymer oil-replacement agent.

The invention discloses an acrylamide copolymer and a preparation method and an application thereof, wherein the acrylamide copolymer contains an acrylamide structural unit and a structural unit A shown in a formula (I), the viscosity average molecular weight of the acrylamide copolymer is more than 30 millions, M1 and M2 can be same or different and respectively can be sodium or potassium. The invention also discloses a preparation method of the acrylamide copolymer, and an application of the acrylamide copolymer as an oil displacement agent, the acrylamide copolymer of the present invention has the advantage of high temperature resistance, and has good tackifying effect under high ore degree, the acrylamide copolymer can be widely used in petrochemical industry filed, and especially is taken as an oil-displacement agent for tertiary recovery.