165 results about "Volumetric shrinkage" patented technology

A polymer containing a triazine ring-containing repeating unit structure represented by, for example, formula (23) or (24), which alone can achieve high heat resistance, high transparency, high refraction index, high solubility and low volume shrinkage, without adding a metal oxide.

The present invention relates to a novel method of using industrial dicyclopentadiene of purity of 75 percent to 85 percent to prepare modified unsaturated polyester resin. In the preparation of the resin, the industrial dicyclopentadiene separated from the saturated or unsaturated dicarbonic acid or acidic anhydride and the distilled part of mixed C5 is used as the raw material. After hydrolysis and addition reaction, the diol or polyol of appropriate amount is added. The polymerization and dehydration reaction is done with the influence of acidic catalyst. When the mixture is condensed to the designated acid value, the inhibitor and cross-linking monomer of appropriate amount are added and then stirred to prepare the product. The present invention has the advantage that the cost of resin is lower than the common type unsaturated resin. At the same time, the air-drying performance, heat resistance, volumetric shrinkage rate and other performances are all superior to the common type unsaturated polyester resin. The product can be widely used in the fields of glass steel, mold, plastic clothing, sealing, and adhesive and so on.

The invention relates to a low-viscosity and high-heat conduction epoxy resin electronic potting adhesive which is formed by mixing a component A with an amine curing agent according to the weight ratio of 100:5-12, wherein the component A comprises the following raw materials in weight ratio: 70-85 parts of spherical alumina powder, 10-20 parts of epoxy resin, 2-4 parts of active thinner, 2.5-5 parts of toughening agent and 0.1-0.5 parts of coupling agent. The invention has the advantages that the spherical alumina of the potting adhesive has higher filling amount compared with non-spherical alumina, the viscosity is less affected, the fluidity is favorable and the construction is convenient; the potting adhesive has good dispersibility and is difficult to sedimentate; a condensate has high heat conductivity and can quickly dissipate accumulated heat of heating parts and components; a high-filling filler can reduce a thermal expansion coefficient and a volumetric shrinkage rate and is very suitable for potting parts and components; and the price is cheaper compared with boron nitride and aluminum nitride, and the cost is low.

In a method for producing a honeycomb structure 20 which comprises disposing a material for forming outer wall 11 on the outer peripheral surface 3 of a cell structure 1 having a plurality of cells serving as fluid flowing channels to produce a cell structure being provided with a material for forming outer wall 10 and firing the resulting cell structure being provided with a material for forming outer wall 10, wherein a cell structure being provided with a material for forming outer wall 10 in which the absolute value of the difference between the volumetric shrinkage percentage (firing shrinkage percentage) before and after firing of the cell structure 1 and the firing shrinkage percentage of the material for forming outer wall 11 is not more than 0.5% is produced and fired. There is provided a method for producing a honeycomb structure which comprises providing an outer wall on the outer peripheral surface and firing it, according to which the outer wall hardly cracks during firing and high-strength and large-sized honeycomb structure can be produced, and further provided is a high-strength and large-sized honeycomb structure in which the outer wall hardly cracks during firing.

The invention belongs to the technical field of building materials and relates to a high-performance concrete expansion agent which is composed of calcium clinker, aluminium material and calcium sulfate by mixing and matching, the calcium clinker contains magnesium oxide which is not more than 5 percent of the total weight, calcium oxide and magnesium oxide of 7 to 12 percent; the aluminium material and the calcium sulfate form ettringite. The high-performance expansion agent of the invention adopts the mutual action of three expansion sources of the CaO, the ettringite and the MgO and simultaneously carries out the utilization, the expansion of the three are appropriately combined to make up for deficiencies of each other, thereby obtaining the most appropriate expansion amount and the expansion exertion, better compensating the concrete shrinkage, improving the anti-crack effect of a product, overcoming the shortcoming of volumetric shrinkage and improving the durability of a building and the safety of the use.

The invention relates to a method for producing electrochromic devices, in particular that having a large working surface area and which does not produce a volumetric shrinkage and can operate during a long maintenance of electrocoloured state of an electrochromic compound, high control voltages and polarity inversion. The inventive electrochromic device comprises at least two electrodes (1, 2), at least one of them being optically transparent. A closed sealed space is formed between said electrodes and filled with the electrochromic compound which is embodied in the form of a solid-like film. The inventive method for producing the electrochromic device consists in prefabricating an initial electrochromic compound in the form of a dispersed electrochromic system which contains at least a suspension and/or colloid. The dispersed medium of said system is embodied in the form of an electrochromic solution containing a liquid solvent, cathode and anode components, a disperse phase being embodied in the form of a finely dispersed polymer. Afterwards, the initial electrochromic compound is deaerated, thereby eliminating dissolved oxygen and air introduced by said finely dispersed polymer, and is used for filling the space between the electrodes.

A method of manufacturing an imprinted effect in a plastic film, characterized by the following steps: (a) applying a hardenable mixture of lacquer and solvent subject to volumetric shrinkage in liquid form to a localized area of the plastic film, whereby the plastic film surface is for all practical purposes made insoluble by the solvent; (b) drying the lacquer-solvent material; (c) hardening the lacquer to a lacquer-laminate layer that is completely bound to a localized area of the surface; and (d) allowing the lacquer-laminate layer to shrink, with a simultaneous tightening of the laminated plastic film below the lacquer-laminate layer without formation of wrinkles.

The invention relates to a method for producing a monocrystalline or polycrystalline semiconductor material by way of directional solidification, wherein lumpy semiconductor raw material is introduced into a melting crucible and melted therein and directionally solidified, in particular using the vertical gradient freeze method.

In order to prevent contamination and damage, the semiconductor raw material is melted from the upper end of the melting crucible. The molten material trickles downward, so that semiconductor raw material which has not yet melted gradually slumps in the melting crucible. In this case, the additional semiconductor raw material is replenished to the melting crucible from above onto a zone of semiconductor raw material which has not yet melted or is not completely melted, in order at least partly to compensate for a volumetric shrinkage of the semiconductor raw material and to increase the filling level of the crucible.

In order to reduce the melting-on time and to influence the thermal conditions in the system as little as possible, the semiconductor raw material to be replenished is heated by the purposeful introduction of heat to a temperature below the melting temperature of the semiconductor raw material and introduced into the container in the heated state.

The invention provides a hybrid light curing material for production of a flexible plate as well as a preparation method and application of the hybrid light curing material, and belongs to the technical field of radiation curing. The hybrid light curing material comprises the following raw materials by weight: 20 to 50 parts of one or more prepolymers, 30 to 50 parts of one or more active monomers, 3 to 5 parts of one or more photoinitiators, and 0.5 to 1 part of a leveling agent, is 20 to 30 cP in viscosity at 25 DEG C, 20 to 30 mN/m in surface tension at 25 DEG C, 40 to 50 m/min in curing speed while the light source linear power 200 W/cm, 1 to 3 mm in flexibility, and about 3 percent in volumetric shrinkage, and can meet the requirements of a 3-dimensional printing flexible plate. The defects of serious environmental pollution, high resource waste, complex production technology and the like in the conventional flexible platemaking technology are overcome.

A stable catalyst with low volumetric shrinkage and a process for making the stable catalyst with low volumetric shrinkage is disclosed. The catalyst is made by sulfiding a catalyst precursor containing at least a Group VIB metal compound; at least a promoter metal compound selected from Group VIII, Group IIB, Group IIA, Group IVA and combinations thereof, having an oxidation state of either +2 or +4; optionally at least a ligating agent; optionally at least a diluent. In the process of making the catalyst, the catalyst precursor is first shaped then heat treated at a temperature of 50° C. to 200° C. for about 15 minutes to 12 hours, wherein the catalyst precursor still has a low (less than 12%) volumetric shrinkage after exposure to a temperature of at least 100° C.

A catalyst with low volumetric shrinkage and a process for making the stable catalyst with low volumetric shrinkage is disclosed. The catalyst is made by sulfiding a catalyst precursor containing at least a Group VIB metal compound; at least a promoter metal compound selected from Group VIII, Group HB, Group HA, Group IVA and combinations thereof, having an oxidation state of either +2 or +4; optionally at least a ligating agent; optionally at least a diluent. In one embodiment, the catalyst precursor is first shaped then heat treated at a temperature of 50 DEG C. to 200 DEG C. for 15 minutes to 12 hours, wherein the catalyst precursor has a low (less than 12%) volumetric shrinkage after exposure to at least 100 DEG C for at least 30 minutes, e.g., in sulfidation or in a hydrotreating reactor.; In one embodiment, the catalyst precursor has an essentially monomodal pore volume distribution with at least 90% of the pores being macropores, and a total pore volume of at least 0.08 g/cc. In one embodiment, the catalyst is suitable for hydrotreating heavy oil feeds having a boiling point in the range of 343 DEG C. (65O DEG F.) - to 454 DEG C. (850 DEG F.), an average molecular weight Mn ranging from 300 to 400, and an average molecular diameter ranging from 0.9 nm to 1.7 nm.

A curable jettable liquid for manufacturing a flexographic printing plate comprising at least one photo-initiator, at least one monofunctional monomer, at least 5 wt % of a polyfunctional monomer or oligomer and at least 5 wt % of a plasticizer both based on the total weight of the curable jettable liquid capable of realizing a layer after curing having an elongation at break of at least 5%, a storage modulus E' smaller than 200 MPa at 30 Hz and a volumetric shrinkage smaller than 10%.

An over-molded thick wall part, an insert used in forming the over-molded thick wall part, and a method of forming over-molded thick wall parts. The insert includes at least two sides, wherein one of the sides includes a flat surface. With a flat surface, there is a tendency to form sink marks rather than internal shrinkage voids to compensate for the volumetric shrinkage of the resin. Therefore, the flat surface enables the insert to cool without forming voids within the interior of the insert that may adversely affect the aesthetics and/or usefulness of the of the over-molded thick wall part. The cooled insert is then encompassed within an over-molded outer component to form the thick wall part. By using a two step molding process to form the thick wall part, substantial time and/or energy savings may be achieved as compared to prior art methods of forming thick wall parts. Depending on the types of materials used to form the insert and the outer component of the thick wall part, various parts may be formed including lenses, handles, housings and the like.

Disclosed is an inorganic heat-insulation fireproof plate, namely a silica bead fireproof heat-insulation plate. The fireproof plate is made of vitrified small balls and xonotlite, the weight ratio of the vitrified small balls to the xonotlite ranges from 1:2 to 1:5, in addition, waterproof materials with the weight ranging from 1% to 5% of the total weight of the fireproof plate and gel materials with the weight ranging from 8% to 10% of the total weight of the fireproof plate are added, and the fireproof plate is manufactured via working procedures including preparation, screening, pressure forming and drying. The vitrified small balls replace traditional common expanded perlite and traditional common polyphenyl particles to be used as lightweight aggregates of dry mixed heat-insulation mortar, shortcomings that the expanded perlite is high in water absorption and easy in pulverization and is high in volumetric shrinkage during slurry stirring, accordingly, low long-term strength, hollowing and cracking of a product are caused easily, and the like are overcome, defects of flammability, poor fireproof performance, harmful gas generation at a high temperature, low ageing resistance and weather fastness, high rebounding during construction and the like of the polyphenyl particles are also overcome, and comprehensive performances and construction property of the heat-insulation mortar are improved. In addition, the hydrophobic vitrified small balls cannot be degraded at a high temperature and are not easy to deform, and the flame retardant property of a polymer can be improved when the vitrified small balls are used as filling materials of the polymer.

Disclosed are plugging mixtures for forming a ceramic honeycomb wall flow filter. The plugging mixtures exhibit a reduced percentage of volumetric shrinkage during the drying process and generally comprise an inorganic ceramic powder batch composition; an organic binder; a liquid vehicle; and a non-foaming volume transformation agent. Also disclosed are methods for forming plugged ceramic wall flow filters from such plugging mixtures and honeycomb articles produced therefrom.

The invention relates to light-cured resin, in particular to a preparation method of light-cured resin containing silicon nano gel for 3D printing and application of the light-cured resin. According to the resin, acrylate monomer and acrylic ester are used for modifying organo-siloxane, solution free radical polymerization is used for preparing organic silicon nano gel, the organic silicon nano gel of different structures, molecular weight and particle sizes is prepared by adjusting the structures and proportion of the monomer and organosilicone, and the optimal structure and proportion of the organic silicon nano gel are obtained. The light-cured resin with excellent comprehensive performance and containing the silicon nano gel for 3D printing is obtained by regulating the composition and proportion of the light-cured resin, and the light-cured resin has the advantages that the processing is easy, the water resistance is good, the volume shrinkage is small, and the material accuracy is high.

An electrohydrodynamic (EHD) method results in charge driven droplet fission and volumetric shrinkage of metal dichalcogenide sheet droplets, thus wrinkling individual exfoliated metal dichalcogenide sheets on the nanoscale. For example, the method can be used to activate the basal plane of solution exfoliated, stable 2H reverted sheets of MoS₂. In this manner, the basal plane of 2H MoS₂ can be strained at an unprecedented scale (3.7%), resulting in charge transport to basal plane defects. The resulting crumpled MoS₂ integrates few layer sheets and atomistic defects with nano- and micro-scale ridges and vertices to enable centimeter-length films that elevate the catalytic site count of MoS₂ from 1.0×10¹⁴ sites/cm² to 2.93×10¹⁷ sites/cm² (planar 2H vs. crumpled 2H) and a turn-over-frequency (TOF) from 0.016 s⁻¹ to 0.130 s^−1.

A pre-stressed annular sealant and method of creating a durable seal in a well bore annulus which is based on hydraulic cement that is designed to be easily pumped and placed into a casing-wellbore annulus, to set into a hardened mass, and to then undergo post-set crystal growth and phase changes in the crystalline matrix to combat inherent volumetric shrinkage and to create internally-generated compressive stress in the cement matrix. This internally-generated compressive pre-stressing compensates for tensile stress induced by well operations. The tensile stress must be greater in magnitude than the magnitude of the compressive pre-stress plus the magnitude of the cement's tensile strength before the cement sheath will fail in tension. This expansion and pre-stressing also creates significantly higher shear bond strengths than those developed with ordinary hydraulic cement.