Laminate structure Laminate structure is the key to the design of carbon fiber sandwich structure

This capability limit of components is a question that designers of carbon fiber sandwich structures need to consider. Laminate structure Laminate structure is the key to the design of carbon fiber sandwich structure. The mechanical properties of a single-layer material composed of a matrix and a reinforcing material are determined by the mechanical properties of the component materials, the phase geometry (the shape, distribution, and content of each phase material) and the properties of the interface zone.

Fatigue and impact damage. Compared with metal materials, the fatigue of composite materials must consider factors such as temperature, humidity, and impact damage. Mechanical connection is suitable for situations where the thickness of the connecting piece is large, the reliability requirements are high, and the large concentrated load is transmitted.Five major structural design points of carbon fiber composite materials: Carbon fiber sandwich structure composite materials replace traditional metal materials, especially in the manufacture of important structural components.

Hybrid connection is a combination of cementation and mechanical connection, which can improve anti-peeling, impact resistance, fatigue resistance, creep resistance and other properties. In most cases, impact damage covers fatigue issues in the structural design. Under the action of external load, the components have the ability to resist deformation and damage, but this ability is limited. For some frame structural parts, if the layer is not uniform, it will also cause warpage instability, so pay special attention in the manufacturing process. polymethacrylimide Suppliers The mechanical properties of a laminated body made of single-layer materials are determined by the mechanical properties of the single-layer materials and the layering geometry (the thickness of each single layer, the laying direction, and the layering sequence).

If the connection between the parts is required, the connection form needs to be designed. However, the factors that determine the strength and rigidity of composite materials are not only related to the types of fibers and resins, but also related to the layering direction of carbon fibers and the combination of layers. Gluing is mainly the use of adhesives to connect parts into an inseparable whole. Therefore, when designing carbon fiber sandwich structural components, the mechanical properties of the three-level structure need to be considered. How to transfer the excellent performance of single-layer structure to composite structural components, and the layer structure plays a role in connecting the past and the next.

Polyurethane synthetic leather has the appearance of soft luster

Spandex has been widely used in textiles.; applications in the automotive industry- -Tires, seals, etc. It has been widely used in many fields, such as: wood paint and wood floor paint; paper coating; architectural coating; leather coating; fabric coating, etc. It is the most ideal substitute for natural leather and is widely used in clothing, shoemaking, luggage, furniture, sports and other industries. PU semi-hard foam Semi- Rigid PU energy-absorbing foam-the energy-absorbing core foam plastic has excellent shock absorption, cushioning performance, good compression load resistance and deformation recovery performance, and its most typical application is to prepare automobile bumpers; Self-skinning foam-used to prepare soft internal functional parts and interior trim parts such as automobile steering wheels, armrests, headrests, etc.; applications in the machinery industry-rubber rollers, tapes, seals, etc.

Self-skinning foam products usually adopt reaction injection molding processing technology; microcellular elastomer-polyurethane The most typical application of microcellular elastomers is in the shoe industry. For the dry process, it contains so much toluene and methyl ethyl ketone. Polyurethane fiber (Spandex, referred to as spandex) Excellent performance of spandex: outstanding high resilience, high resilience of spandex is unmatched by all elastic fibers at present, and its elongation at break is greater than 400%, up to 800 %, even at 300% tensile deformation, the rebound recovery rate is still more than 95%; excellent tensile strength, tear resistance; strong weather resistance, UV resistance; chemical resistance, washing resistance; and dye Good affinity., in different application areas The selected elastomers have different hardness ranges.; Imitation wood-high density (density 300~700kg/m3) Polyurethane rigid foam or glass fiber reinforced rigid foam is structural foam plastic, also known as imitation wood.

Polyurethane synthetic leather has the appearance of soft luster, natural, soft hand, and strong leather feel. Polyurethane slurry is used as coating to prepare polyurethane synthetic leather and artificial leather. Porous materials such as foam, plastic, wood, leather, fabric, paper, ceramics, and materials with smooth surfaces such as metal, glass, rubber, and plastic have excellent chemical adhesion; have excellent shear strength and impact resistance Characteristics, suitable for various structural bonding fields, and has excellent flexibility; polyurethane adhesives have excellent rubber properties, can adapt to the adhesion of substrates with different thermal expansion coefficients, and form a soft -Hard transition layer, not only has strong adhesion, but also has excellent cushioning and shock absorption functions; the low temperature and ultra-low temperature performance of polyurethane adhesives exceeds all other types of adhesives; waterborne polyurethane adhesives-waterborne polyurethane adhesives have low VOC content and low Or no environmental pollution, non-combustibility, etc.

It has the advantages of good cold resistance, breathability, washability, convenient processing, high price and so on. Polyurethane slurry is divided into two categories: wet method and dry method.; application in civil engineering-caulking and sealing of highways, bridges, airstrips, etc. 4. It is a new high-value-added textile material. is one of the main substitutes for solvent-based coatings. Low, it can replace wood for various high-end products; potting materials-such as waterproof grouting materials, leak-stopping materials, roof waterproof materials; CASCELL® HF flower industry-PU flower pots, flower arrangement mud, etc. The solvent is mostly toluene and methyl ethyl ketone. The amount of toluene is larger because the solubility of toluene is better., polyurethane rigid foam is the most ideal insulation material for refrigeration equipment; industrial equipment insulation-such as storage tanks, pipes, etc. 6. It has excellent mechanical properties such as excellent adhesion to the substrate, abrasion resistance, flexural resistance, anti-aging, and anti-fungal properties. It is a polymer solution system with transparent or slightly turbid appearance, and the solid content is about (30-35)%, that is to say, the (65- 70)% is a solvent.

The main characteristic is its hardness and toughness

Combustion and recovery of heat energy polyurethane mainly contains carbon, hydrogen, oxygen, nitrogen, and air Oxygen combustion produces a large amount of heat energy, about 25-28 MJ per kilogram wave-transmitting foam of polyurethane. It is pulverized into particles with a particle size of less than 1MM. 539 PMI foam, PMI foam manufacturer, PMI foam price Thank you for having .

The decomposition products produced by various methods are different. Recycling of chemical methods: Because the polymerization reaction of PMI foam is reversible, the polymerization reaction can be reversed by controlling certain reaction conditions. 3. Its foamability, elasticity, abrasion resistance, low temperature resistance, solvent resistance, biological aging resistance and other excellent properties make it widely used in refrigeration equipment , Cars, trains, roofs, rigid foam hollow bricks, polyurethane rigid foam concrete, storage tank pipe insulation, packaging, office supplies and other fields.

Most of the cell structure is closed cell type, and a small amount of open cell structure hard foam is used for special occasions. The main characteristic is its hardness and toughness., but mainly by bonding and pressure molding., Ltd. A highly cross-linked Thermosetting material.

Recycling 1. Polyurethane waste is often used as fuel together with municipal solid waste, which can replace part of coal and be used as fuel for boilers. The crushing method is used to treat polyurethane scraps and old waste before application.. Therefore, the pulverization technology is relatively mature.PMI foam’>The processing and recycling of PMI foam: PMI foam is a kind of thermal insulation material and structural material with excellent performance. The voice of opposition to the law continues to rise. Composite sandwich structure

Used in composite sandwich structure

Low aluminum equivalent, suitable for medical equipment industry.  Processing convenience: easy for mechanical processing; and can be bent into various curved surfaces under heating conditions, which improves design freedom; fatigue resistance: unique molecular structure gives it good fatigue resistance, especially suitable for bearing dynamic loads Composite sandwich structure; dielectric properties and aluminum equivalent: PMI foam has low dielectric constant, low dielectric loss, and good electrical insulation in a wide frequency range, suitable for radar equipment.

High closed cell rate: closed cell rate 95%～98% , Used in composite sandwich structure, can avoid possible moisture absorption and degumming problems of honeycomb core material, improve safety performance and prolong service life. Because of its high closed cell rate and water pressure resistance, it can be used as underwater buoyancy material. 2.PMI foam’>The performance advantages of PMI foam: 1. Easy to bond: It is suitable for various resin systems such as epoxy and unsaturated polyester, and has high bonding strength. High mechanical properties: high specific strength and high specific modulus.

Its tensile, compression, bending, shear and other strengths and moduli are far better than those of pvc, pu, pet and other foam or balsa core materials, and are isotropic, can improve strength, improve rigidity, and reduce weight; high heat resistance: unique cross-linked structure, imide ring structure, high temperature stability and resistance Good compressibility, heat distortion temperature 200℃, adapt China Radom foam Suppliers to high temperature molding or vacuum autoclave co-curing molding process, shorten process time, improve production efficiency, and improve structural performance.

PMI foam, PMI foam manufacturer, PMI foam price Multi-field applications of composite material sandwich structure core material polyurethane core foam plastic. The high closed cell ratio and fine and uniform cells also make the material have good sound insulation, heat insulation, and moisture barrier properties

Fermentation tank is a kind of equipment for mechanically stirring and fermenting materials

Designed in accordance with sanitary requirements, the structure design is very user-friendly and easy to operate. The following is the structural characteristics of the fermentation tank. Appropriate diameter-to-height ratio design, customized mixing device as required, energy saving, good mixing and fermentation effect. With the development of the fermentation tank, it is necessary for us to understand some knowledge of the fermentation tank . Online CIP cleaning and SIP sterilization ; the openings of the inlet and outlet pipes, sight mirrors, manholes, etc. Smooth transmission and low noise.

The fermentation tank adopts an aseptic system to avoid and prevent the contamination of microorganisms in the air, which greatly extends the shelf life of the product and the purity of the product. and the welding of the inner tank are all made of stretch flanging arc transition , Smooth and easy to clean, no dead corners, ensuring the reliability and stability of the production process..Fermentation tank is a kind of equipment for mechanically stirring and fermenting materials.The equipment adopts an internal circulation method, using a stirring paddle  to disperse and break air bubbles, it has a high dissolved oxygen rate and a good mixing effect. The surface of the inner tank is mirror-polished.

Fermentation tank is a kind of equipment for mechanically stirring and fermenting materials. The most commonly used are pH electrodes and DO electrodes to monitor the changes in pH and DO of the fermentation broth during the fermentation process; The controller is used to display and control the fermentation conditions. However, it is necessary for us to understand the structure and composition of the fermenter before using it. According to the equipment of the fermentation tank, it is divided into mechanical stirring and ventilation fermentation tank and non-mechanical stirring and ventilation fermentation tank; according to the growth and metabolism of microorganisms, it is divided into aerobic fermentation tank and anaerobic fermentation tank.

Fermentation tanks are widely used in beverage, chemical, food, dairy, condiment, brewing, pharmaceutical and other industries to play a fermentation role. There are control sensors on the top plate of the tank. The equipment Wholesale China cascell manufacturers adopts an internal circulation method, using a stirring paddle to disperse and break air bubbles, it has a high dissolved oxygen rate and a good mixing effect.

The components of the fermentation tank include: the tank body is mainly used for culturing and fermenting various bacteria, with good sealing (to prevent the bacteria from being contaminated), there is a stirring slurry in the tank, which is used for continuous stirring during the fermentation process; the bottom has aeration Yes, it is used to pass in the air or oxygen needed for the growth of the bacteria