Application of foam casting
DATE：2022/5/3 8:45:57 / READ： / SOURCE：This station
Application of foam casting
Compared with other foaming methods, foam casting has the following characteristics. ① The raw material is a mixture of low viscosity. After casting, the viscoelasticity of the raw material increases gradually with the progress of polymerization until it is cured and set; ② The foaming process and polymerization process go together at the same time; ③ Mainly used for molding high foaming plastic products; ④ The molding equipment is relatively simple and can be operated on site; ⑤ It can be used for forming large strip and block shaped foamed plastic products and spraying foamed plastic layers. Because of the above characteristics, casting foaming has become the main forming method of foamed plastics, and has occupied an irreplaceable position, especially for thermosetting foamed plastics, most of them are formed by this method. Hollow board production line www.handern.com comPolyurethane has become an indispensable material in many industrial sectors. Due to the production certificate of polyurethane country, this achievement can not be compared with that of any other plastics. Zidi Jiaoliu Ku foam plastic has been widely used in furniture, bedding, automobile, aviation, packaging, textile room composite foam pad, carpet pad, sports equipment, toys, artificial limbs, daily necessities, transit animals
Materials, gardening, shoes and hats, medical and health supplies, construction, and national defense cutting-edge. Polyurethane foam has been widely used in cold storage equipment, tank cars, petrochemical pipes, storage tanks for heat preservation, construction, aviation, shipbuilding, packaging, electrical appliances, space technology and military, and semi-rigid polyurethane foam is mainly used in shockproof and buffer parts and the interior decoration of automobiles and aircraft. Here are some polyurethane foam products that have grown rapidly in recent years. Hollow board production line www.handern.com com
1. casting of soft polyurethane foam cushion
Due to its low price, light weight and good performance, the soft polyurethane foam cushion is comparable to foam lactic acid, and its quality is only the same as that of foam latex~ ½， Moreover, it is easy to manufacture, check the quality of stable materials, reduce the amount of organic tin or increase the amount of family strengthening m, control the pressure of heteropoly acid, increase the pressure or increase the flow, control all pneumatic valves to smell and save the feeding amount, and build gas. There is no way to open and close the business door. Reduce the amount of isocyanate, increase the temperature and control the new dosage within a certain range. Increase the amount of stabilizer and reduce the height between the outlet and the mold, The total quality of Tatong can not stop the air from leaking into the mixing head. Sometimes the air comes to reduce the amount of organotin. The stock issuing speed is too fast. Control the mold temperature. The monthly source of the mold is uneven and too high. Pay attention to the size of the discharge port, and adjust the distance from the discharge port or irregular injection port to the mold. Remove the dirt in the mold. The mold is not clean. Hollow board production line www.handern com
The properties of polyurethane foam can be changed by changing its raw material formula. As a cushion, it needs good resilience and comfort. Therefore, high active polyether and cold curing process should be adopted to obtain high resilience soft polyurethane foam. As for the forming method, the cutting method was first adopted, which cut the whole foam according to the required shape, and then use the adhesive to bond the coating material and skeleton. This method has low utilization rate of foam plastic, corner waste and complex forming process. Now the molding method is adopted, which is particularly suitable for those with complex shape and reinforced inserts. Refer to table 7-33 for the formula and performance of high resilience polyurethane foam cushion. This cushion can be used as a cushion, backrest, pillow, etc. in cars. This kind of foam can be made into high permeability foam by removing part of the cellular membrane by explosion.
2. Synthetic wood high density polyurethane rigid foam has some characteristics of wood, which can be planed, nailed and sawed. Therefore, it is called "synthetic wood", which is often used as the structural material of various high-grade furniture. Through molding, various complex structures and carving patterns can be molded. Molded carved tables and screens are used as furniture such as seats, chairs, doors and windows. They have strong three-dimensional feeling and bright colors. They are the formula and performance of synthetic wood. Hollow board production line www.handern.com com
3. Lilin thermal insulation and cold proof material: rigid polyurethane foam has excellent thermal insulation and cold proof function. All vehicles are insulated with polyurethane, and 60mm polyurethane is sprayed on six sides on average. Each vehicle uses about 900kg material. When the train is driven in the area of - 30 ℃, it can maintain 20 ℃ in the carriage, while the general felt material is used, and the temperature in the carriage can only be about 0 ℃, so it can be seen that it has excellent thermal insulation and cold resistance. The hard polyurethane foam is constructed by spraying method, which saves%~% man hours compared with other plastics by pasting process. At the same time, it has high strength and long service life Hollow board production line www.handern.com com
4. double layer foam soles polyurethane foam soles have the characteristics of lightness, comfort, flexibility, warmth preservation and wear resistance. At present, about 6%~7% of the sole materials in the world are polyurethane. Compared with rubber soles, polyurethane foam soles are better in flexion resistance, skid resistance, oil resistance and solvent resistance. The wear resistance is 5-6 times higher than rubber, and the density is about 0.6g/cm3. The hardness can be changed by changing the formula and forming.
Author：admin