64results about How to "Improve heat deformation resistance" patented technology

Composition containing, based in each case on its total weight,

• • A) 50.0% by weight to 99.5% by weight of at least one (meth)acrylate (co)polymer and
  • B) 0.5% by weight to 50.0% by weight of at least one copolymer obtainable by polymerisation of a monomer mixture comprising
    • i. 70% by weight to 92% by weight of a vinylaromatic monomer and
    • ii. 8% by weight to 30% by weight of acrylonitrile or methacrylonitrile or mixtures thereof and
    • iii. 0% by weight to 22% by weight of at least one further monomer, the composition having a haze according to ASTM D1003 of less than 2.0% at 23° C. and a haze according to ASTM D1003 of less than 4.0% at 40° C. and the composition containing at least one (meth)acrylate (co)polymer a) having a solution viscosity in chloroform at 25° C. (ISO 1628—part 6) of greater than 55 ml/g.

The mouldings obtainable from the composition are distinguished in particular by improved stress cracking resistance and are suitable in particular for coverings, finishes or films.

The invention relates to a composition containing, in relation to the total weight of said composition, A) between 50.0% by weight and 99.5% by weight of at least one (meth)acrylate (co)polymer and B) between 0.5% by weight and 50.0% by weight of at least one copolymer, obtained by the polymerisation of a monomer mixture consisting of i. between 70% by weight and 92% by weight of a vinyl aromatic monomer and ii. between 8% by weight and 30% by weight of acryl nitrile or methacryl nitrile or mixtures thereof iii. between 0% by weight and 22% by weight of at least one other monomer, the composition having at 50° C. a ΔE of less than 0.15, ΔE being defined according to the relationship (1): (1) in which ΔL*: the modification of the colour co-ordinates L* compared with the colour co-ordinates L* at 23° C., Δa*: the modification of the colour co-ordinates a* compared with the colour co-ordinates a* at 23° C., Δb*: the modification of the colour co-ordinates b* compared to the colour co-ordinates b* at 23° C., and the composition contains at least one (meth)acrylate (co)polymer a) with a solution viscosity in chloroform at 25° C. (ISO 1628 part 6) greater than 55 ml/g. The moulded bodies that can be obtained from the composition are characterised in particular by improved stress cracking resistance and are suitable in particular for use in coatings, paints or films.

The invention relates to the field of friction materials for braking of high-speed trains, in particular to a ceramic/metallic double continuous phase composite material brake pad and a preparation method thereof. The brake pad comprises the following components in percentage by weight: 15 to 40 percent of foam silicon carbide ceramics, 10 to 30 percent of friction element and 75 to 30 percent ofmetal. The method comprises the following steps of: preparing the silicon carbide foam ceramics having a three-dimensional network structure by employing a technology combining polymer pyrolysis withcontrollable infiltration reaction sintering; selecting a proper friction element and filling in mesh holes of the foam ceramics; and injecting melt copper alloy into a framework of the foam ceramicsby utilizing an extrusion casting method to obtain the ceramic/metallic double continuous phase composite material brake pad. The composite material brake pad can be paired with a 28CrMoV forged steel brake disc, has the characteristics of proper and stable friction coefficient, low wear rate, high heat resistance, high thermal or mechanical damage resistance, good process performance, low manufacturing cost, long service life and the like, completely meets the brake requirement of a high-speed train at a speed of 200 to 300km/h, and has good competitive advantage on the brake requirement of a high-speed train at the speed of 350km/h.

A water cooled electromagnetic crystallizer for conticasting is composed of upper and lower flanges, coil, sleeve pipe of crystallizer, cooling water jacket, cooling water tube, connection part and lifting gear. It features that the upper part of said sleeve pipe has local slit structure, the cooling water tube is arranged in split body and a water seam structure is formed between the lower part of said sleeve pipe and cooling water jacket.

The invention discloses a chemical corrosion-resistant table rubber sheet, a preparation method and applications thereof. The table rubber sheet mainly consists of the following raw materials by weight percentage: 2 percent to 40 percent of anhydride curing agent, 2 percent to 40 percent of other types of acid anhydrides, 2 percent to 50 percent of epoxy resin systems, 40 percent to 93 percent of filler and 0.01 percent to 1 percent of initiator, wherein, the anhydride curing agent is maleic anhydride and the initiator is hydroperoxide or dialkyl peroxide. The preparation method of the invention includes the steps that maleic anhydride is introduced in common acid anhydrides and added with a peroxide initiator to initiate the free radical polymerization and form an interpenetrating network structure so as to improve the heat distortion temperature of products. Meanwhile, by adopting the preparation method of the invention, the products can be made from raw materials with lower prices, thus having relatively high market competitiveness. When being applied to an experiment table top in a laboratory, the table rubber sheet of the invention can has relatively good flatness on the sheet surface, good wearing resistance and chemical corrosion resistance as well as comparatively high heat distortion resistance.

The invention relates to a preparation method of a polymethacrylimide foam material with obviously improved thermodynamic performance. The invention is characterized in that the polymerization product used for the polymethacrylimide foam material is added with 0.05wt percent to 5wt percent of olefinic unsaturated compound capable of free radical polymerization and with at least two double bonds and 1wt percent to 5wt percent magnesia. The invention also relates to the polymethacrylimide foam material with anti-thermal-distortion larger than 250 DEG C, and the usage of polymethacrylimide foam material in preparing interlayer component.

The invention discloses a functional coating diaphragm for a lithium ion battery, and a preparation method of the functional coating diaphragm. The preparation method comprises the following steps: uniformly mixing ceramic powder with a coupling agent to obtain pretreated ceramic powder; adding a dispersing agent and a thickening agent into deionized water, dissolving, then adding the pretreated ceramic powder and polymer emulsion, uniformly stirring and dispersing, adding a binding agent and a wetting agent, and uniformly stirring and dispersing to obtain modified ceramic slurry; coating onesurface or two surfaces of a base membrane with the modified ceramic slurry in a coating manner, and drying to obtain the functional coating diaphragm. According to the invention, through coating pretreatment of the coupling agent, the ceramic powder is non-polar, so that the acting force between the ceramic powder and a polymer is enhanced; according to the functional coating diaphragm prepared by the invention, pore closing of the diaphragm at a relatively low temperature can be realized, and the thermal deformation resistance of the diaphragm at a high temperature can be improved, so that the safety performance of a power battery can be effectively improved; and the preparation method is simple, low in cost and convenient for industrial production.

The invention discloses a metal ceramic die-casting die with tensile prestress and a preparation method of the metal ceramic die-casting die and belongs to the technical field of coating preparation.The metal ceramic die-casting die comprises a die base and a metal ceramic layer which is arranged on the surface of the die base and has tensile prestress. By means of thermal adaptation between thedie base and the prepared metal ceramic layer, the metal ceramic layer has the tensile prestress after being prepared, and the metal ceramic layer and the die base are metallurgically or mechanicallybonded. Preparation of the metal ceramic layer with the tensile prestress comprises the following steps: a, removing an oxidation film from the die base, and performing oil-removal cleaning; b, preparing the metal ceramic coating with the tensile prestress by selecting one of a spray method, a vapor deposition method, a composite coating method, a self-propagating high-temperature synthesis methodand a high-temperature fusion method. With adoption of the coating prepared with the preparation technology, the technical problem that thermal fatigue resistance, wear resistance and heat distortionresistance of the die are not ideal is solved effectively, the service life of the die is prolonged, quality of workpieces is improved, and yield of the workpieces is increased.

A novel norbornene derivative represented by a general formula (1m) shown below is provided. By conducting a ring opening polymerization of this norbornene derivative, or by performing a subsequent hydrogenation following the ring opening polymerization, a ring opening polymer or a hydrogenated product thereof with an excellent low birefringence can be obtained. [wherein, at least one of R<1 >to R<4 >is a group selected from the group consisting of groups represented by a general formula (1-1) shown below and groups represented by a general formula (1-2) shown below] [wherein, at least one of R, Rand Z is a group represented by the formula -C(O)O-].