15 results about "Volumetric shrinkage" patented technology

Provided in the present application are an adhesive, a bonding structure and a structural component. The adhesive comprises an adhesive filler having an expandable volume, and the adhesive filler comprises a spherical polymer material having a pore structure. During the curing reaction process of the adhesive, the shape of the polymer material can be gradually restored, and the volume of the adhesive filler can be expanded to a certain extent, such that the volume shrinkage caused by a resin main agent, etc. of the adhesive during the curing reaction process can be compensated to a certain extent, and the curing volume shrinkage rate of the adhesive is reduced. The curing volume shrinkage rate of the adhesive containing the adhesive filler is low, the deformation, displacement, internal stress, etc. caused during the curing reaction process are lower, the structure of a structural member using the adhesive is reliable, and the function of a device is stable.

The application belongs to the technical field of building materials, and particularly relates to a time-divided shrinkage-controlling composite expansion agent and a preparation method thereof. The composite expansion agent is composed of the following components in parts by weight: 0.5-8 parts of an azo compound, 20-30 parts of magnesium oxide, 10-30 parts of calcium oxide, 30-50 parts of calcium aluminate-calcium sulfoaluminate cement clinker, 5-10 parts of spherical sodium polyacrylate after pre-water absorption, and 5-10 parts of core-shell structure polyacrylamide resin / kaolin composite ball. The time-divided shrinkage-controlling composite expansion agent improves the full-time volume stability of concrete, greatly reduces the volume shrinkage of cement stone, and fundamentally solves the problem of large shrinkage of ultra-low water-binder ratio concrete.

This application relates to the field of dental restorative materials technology and discloses a light-cured composite resin inlay, comprising an inlay body, an elastic transition layer, an adhesive layer, and a surface treatment layer. This light-cured composite resin inlay, through the use of a high-strength composite resin inlay body and a reinforcing fiber network, effectively disperses the internal stress generated by the composite resin during light curing. Subsequently, a silane coupling agent enhances the bonding force between the reinforcing fiber network and the high-strength composite resin, thereby increasing the overall strength of the inlay body, reducing the risk of restoration damage due to stress concentration, and lowering the possibility of gaps caused by volume shrinkage. This improves the fit between the restoration and the tooth structure. The inlay body is formed in one step using light-curing technology, ensuring the overall structural strength and performance consistency of the inlay body, while also improving production efficiency and reducing production costs.

The present application relates to a kind of high Tg low warping resin composition and its preparation method and application, belong to the field of semiconductor packaging technology.The resin composition includes filler 85-90 parts by weight, naphthalene ring type epoxy resin 4-6 parts, multifunctional epoxy resin 1.5-3 parts, curing agent 4.5-7 parts, diluent 0.2-0.6 parts, accelerator 0.1-0.4 parts and dyeing agent 0.1-0.2 parts.The resin composition is applied as wafer packaging liquid state mold sealant.The present application uses naphthalene ring type epoxy resin as main resin, and uses multifunctional epoxy resin as secondary resin, so that when the resin composition is applied as liquid state mold sealant, it can not only ensure low volume shrinkage and low expansion volume, but also adjust viscosity through low viscosity multifunctional epoxy resin.

This invention discloses a low-shrinkage, highly corrosion-resistant glass flake coating and its preparation method. The coating comprises a main agent, which is mainly prepared from the following components in the following weight ratios: 45-65 parts epoxy vinyl unsaturated polyester resin, 20-30 parts glass flakes, 1-3 parts fluorinated toughening modifier, 0.1-2 parts dispersant, 0.1-1 part defoamer, 0.1-3 parts thixotropic agent, 1-15 parts unsaturated polyester reactive diluent, and 1-15 parts acid and alkali resistant powder; the epoxy vinyl unsaturated polyester resin includes phenolic epoxy vinyl unsaturated polyester resin. The coating of this invention exhibits excellent heat resistance and structural stability, and demonstrates superior toughness and acid resistance at high temperatures. It effectively reduces volume shrinkage during curing, achieving low shrinkage performance and extending the service life of the coating.

The application relates to the technical field of waterproof materials for shield tunnel engineering, and discloses a shield segment sealing gasket with high resilience and compression deformation resistance and a preparation method, which is made of solid ethylene-propylene-diene copolymer, reactive pre-dispersed masterbatch, carbon black and peroxide vulcanizing agent and the like. The masterbatch comprises carbon black, zinc methacrylate, liquid ethylene-propylene-diene rubber and alpha-methylstyrene dimer. In the application, an ionic and covalent double crosslinking network is constructed through in-situ polymerization, and reactive plasticization is realized by using liquid rubber, so that the volume shrinkage problem caused by the migration of traditional plasticizers is solved. In combination with a specific pre-dispersing process, the material has excellent compression permanent deformation resistance and long-term dimensional stability, and the safety and durability of tunnel sealing are significantly improved.

The application discloses an in-mold gate cutting device and an injection mold with the same. The injection mold comprises a fixed mold assembly, a movable mold assembly, a cutting member with a working end, and a driving mechanism. The working end comprises a shearing part opposite to a section of a gating runner close to a molding cavity, and an extruding part with a larger cross-sectional area on the side of the shearing part away from the fixed mold assembly. The driving mechanism drives the cutting member to perform continuous variable-speed pushing processes in the direction close to the fixed mold assembly: in the first stage, the shearing part cuts off the melt in the section at a first speed and traps part of the melt; in the second stage, the extruding part extrudes the trapped melt at a second speed smaller than the first speed and pushes the trapped melt into the molding cavity to compensate for the volume shrinkage of the melt inside the molding cavity during the cooling and solidification process. The application effectively eliminates the surface shrinkage defects of the injection molded product by integrating the cutting and extruding compensation functions, and improves the molding quality.

This invention provides a continuous testing device for the three-dimensional volumetric shrinkage characteristics of soil, belonging to the technical field of geotechnical testing equipment. It includes: a transparent outer casing to form a sealed testing space; a graduated inner measuring cylinder containing a polymer solution for measuring sample volume, which also has a weighing function; a sample placement rod with a hydrophobic coating sprayed on both the inside and outside of the testing space, and a lifting handle; the sample can be completely immersed in or pulled out of the polymer solution by adjusting its longitudinal position; a fixing ring for fixing the position of the sample placement rod; and a base for supporting the upper device. This invention features a simple structure, reliable performance, and high testing accuracy. The test data can more accurately reflect the shrinkage characteristics of the soil under test. If the transparent outer casing is connected to a temperature and humidity controller, the testing device can obtain the shrinkage characteristics of soil under different temperature and humidity environments without disturbing the soil, effectively reducing errors during the testing process and improving testing efficiency.

This invention discloses a matte heat-sealable film and its preparation method, relating to the field of heat-sealable film preparation. The matte heat-sealable film includes a heat-sealable layer, which is made of a composition comprising the following components in parts by weight: 60 parts of random copolymer polypropylene, 15 parts of low-density polyethylene, 8 parts of heat-shrinkable microsphere precursor, 5 parts of tackifying resin, 0.3 parts of slip agent, and 0.4 parts of antioxidant. The heat-shrinkable microsphere precursor is a core-shell structured microsphere, with the core layer copolymerized from isoborneol methacrylate and trimethylolpropane triacrylate, and the shell layer being a long-chain alkylsiloxane graft layer. Its average particle size is 8 μm, and its volume shrinkage rate at 130°C is 8%. This invention, by introducing the heat-shrinkable microsphere precursor to form an in-situ micro-wrinkled structure within the heat-sealable layer, can impart a matte appearance to the film without using inorganic matting agents.

This invention discloses a carbon nanoparticle polymer material for repairing wind power gearbox housings, its preparation method, and a rapid repair method, belonging to the technical field of wind power equipment repair and polymer composite materials. Addressing the problem of severe exothermic curing and large volume shrinkage leading to crack propagation during thick-coating repair of cast iron wind turbine gearbox housings using existing epoxy repair materials, this invention provides a cationic ring-opening polymerization system based on alicyclic epoxy resin, using diaryliodonium salt as a thermo-cationic initiator, spirocyclic orthocarbonate as an expanding monomer, and introducing 4,4'-diaminobenzoylaniline to construct a dynamic hydrogen bond network. This invention also provides an A / B two-component preparation method for this material and a rapid on-site repair process. The material of this invention exhibits a low peak internal temperature after a single coating, low volume shrinkage, high compressive strength, and high shear strength, effectively solving the problem of thermal stress-induced cracking during thick-coating repair of cast iron wind turbine gearbox housings.

The application discloses an in-mold gate cutting device and an injection mold with the same. The injection mold comprises a fixed mold assembly, a movable mold assembly, a cutting member with a working end, and a driving mechanism. The working end comprises a shearing part opposite to a section of a gating runner close to a molding cavity, and an extruding part with a larger cross-sectional area on the side of the shearing part away from the fixed mold assembly. The driving mechanism drives the cutting member to perform continuous variable-speed pushing processes in the direction close to the fixed mold assembly: in the first stage, the shearing part cuts off the melt in the section at a first speed and traps part of the melt; in the second stage, the extruding part extrudes the trapped melt at a second speed smaller than the first speed and pushes the trapped melt into the molding cavity to compensate for the volume shrinkage of the melt inside the molding cavity during the cooling and solidification process. The application effectively eliminates the surface shrinkage defects of the injection molded product by integrating the cutting and extruding compensation functions, and improves the molding quality.

The present invention relates to a glass-ceramic molded article and a manufacturing method therefor. The glass-ceramic molded article is manufactured by debinding and crystallization heat treatment of a 3D printed object including an organic binder and crystalline glass particles, to include a crystalline phase dispersed in a glass matrix, unlike the 3D printed object. Therefore, a high-strength glass-ceramic molded article can be provided with a low volume shrinkage rate using a simple method, and the high-strength glass-ceramic molded article may be useful, for example, as a glass-ceramic prosthesis.

This invention discloses a method for gradient atmospheric pressure-microwave composite drying and SiCl4-reinforced silica aerogel. The method first involves gradient atmospheric pressure drying of the wet silica gel: drying at three temperature stages—40±5℃, 80±5℃, and 110±5℃—for 2–5 hours each. Then, it is reinforced by intermittent microwave drying at 120–180W, with a cooling period of 3–5 minutes after every 8–10 minutes of heating, ensuring the internal temperature gradient of the gel is controlled within 5℃, achieving uniform drying from the inside out. Finally, gas reinforcement treatment is performed at 300±15℃ and a SiCl4 partial pressure of 0.05–0.1 MPa to achieve molecular-level repair and cross-linking reinforcement of skeletal defects. The aerogel prepared by this method has a porosity of 93%–97%, a thermal conductivity of 0.015–0.019 W / (m·K), and a volume shrinkage rate of ≤2.5% at 1200℃. It has excellent resistance to deformation and the preparation cost is reduced by more than 60% compared with the supercritical drying process. It can be used in the fields of high temperature insulation, aerospace protection, adsorption and catalytic support.

The application discloses a kind of conformal heat-conducting insulating composite material and its preparation method and application method, it is related to semiconductor packaging and thermal management technical field.The composite material includes: organic polysilazane resin 40-60 parts, toughening agent 4-10 parts, crosslinking agent 0.1-3 parts, low dielectric heat-conducting filler 35-85 parts, heat-conducting filler dispersant 0.3-2 parts, low volume shrinkage modifier 5-10 parts, catalyst 0.1-1 part, polymerization inhibitor 0.01-0.06 parts, solvent 5-90 parts;Wherein low dielectric heat-conducting filler is hexagonal boron nitride nanosheet, spherical silicon powder and the complex of undefined aluminum nitride, low volume shrinkage modifier is cage-type silsesquioxane.The composite material of the application can perfectly fill micron chip gap, volume shrinkage rate is low after solidification, interface thermal resistance is small, has excellent temperature resistance and high insulation, can satisfy the requirement of high-end equipment manufacturing field such as aerospace, high-performance computing to thermal management material.

The application discloses a kind of high permeability high strength nano-silica sol-based composite grouting material and its preparation method, belong to grouting material technical field.It is constituted by the mixture of composition A and composition B with mass ratio of 4:5, composition A includes 35-38% of water by mass percentage, 61-64% of aluminate cement by mass percentage, 1% of modified additive;Composition B includes 96-99% of nano-silica sol by mass percentage, 1-4% of setting accelerator by mass percentage.Composition A is slowly added into composition B, and the adding time is not less than 1min, and the mixing temperature is 15-35 DEG C.The surface of slurry is not cracked, the stone rate of stone body is high, the volume shrinkage rate is low, the long-term volume stability is excellent, and the interface microstructure of slurry and mudstone is combined densely without gap, and the adhesion is excellent.