70results about How to "Small dimensional change rate" patented technology

A polyimide film that can provide a flexible metal-clad laminate plate which causes no significant dimensional change upon etching of the metal layer. The polyamide film is characterized in that, in the whole width of a continuously produced polyimide film, the ratio of the hygroscopic swelling coefficient in a direction (b) perpendicular to the molecular orientation axis to the hygroscopic swelling coefficient in a direction (a) parallel to the molecular orientation axis, i.e., b / a, is not less than 1.01 to not more than 2.00 and the difference between the maximum value of the hygroscopic swelling coefficient ratio and the minimum value of the hygroscopic swelling coefficient ratio is not more than 0.30.

The invention discloses a flame retardant polyurethane spray coating foamed plastic, which is composed of a combination white material and isocyanate with mass ratio as 1: 1-1.2. The combination white material includes the following components by mass: 65 to 75 parts of trihydroxyl-amino resin, 5 to 15 parts of trihydroxyl phosphate, 8 to 20 parts of poly-phosphate amine, 10 to 15 parts of glycerin, 2.5 to 3 parts of silicon-carbon bond non-hydrolysis polysiloxane- polyether copolymer, 0.6 to 0.8 part of water, 0.25 to 0.3 part of N,N,N,N,N-pentamethyl-diethylenetriamine, 0.8 to 1 part of dimethylcyclohexylamine, 1.8 to 2 parts of dipropylene glycol solution of triethylene diamine of 33+ / -1Wt.%, 0.15 to 0.2 part of dibutyltin dilaurate catalyst, 3 to 3.5 parts of hexahydro-triazine, 11 to 15 parts of fatty alcohol-polyoxyethylene ether, 25 to 35 parts of 4(2-chloride ethyl) diethylene-ether-diphosphate and 30 to 38 parts of fluorine ethylene dichloride. The flame retardant polyurethane spray coating foamed plastic is good in heat resistance, fire penetration resistance and flexibility and high in strength. According to the detection, the inflaming retarding grade of the product can reach the B grade according to GB / T8624-2006 standard, so that the flame retardant polyurethane spray coating foamed plastic can be used in various fireproof building fields.

A flexible laminated sheet manufacturing method includes thermocompression-bonding an insulation film formed of a liquid crystal polymer onto a metal foil between endless belts to form a flexible laminated sheet. The thermocompression bonding includes heating the flexible laminated sheet so that the maximum temperature of the sheet is in the range from a temperature that is 45° C. lower than the melting point of the liquid crystal polymer to a temperature that is 5° C. lower than the melting point. The thermocompression bonding also includes slowly cooling the flexible laminated sheet so that an exit temperature, which is a temperature of the sheet when transferred out of the endless belts, is in the range from a temperature that is 235° C. lower than the melting point of the liquid crystal polymer to a temperature that is 100° C. lower than the melting point.

The invention relates to a low-density conjugate polyether for external wall spraying. The low-density conjugate polyether comprises the following components in parts by weight: 10-40 parts of polyether polyol I, 0-50 parts of polyether polyol II, 0-50 parts of polyether polyol III, 15-30 parts of polyether polyol IV, 0.6-4 parts of catalyst I, 0-2 parts of catalyst III, 0-10 parts of catalyst IV, 0-1 part of catalyst V, 0-5 parts of silicone oil I, 10-35 parts of additive flame retardant, 2.6-10 parts of water and 36-150 parts of HCFC-141b (Hydrochlorofluorocarbon-141b). The preparation method for the low-density conjugate polyether comprises the following step of: putting the raw materials into a container in percentage by weight and uniformly stirring to obtain the low-density conjugate polyether for the external wall spraying. The shaping density of rigid polyurethane foaming plastic prepared from the low-density conjugate polyether is 25-34kg / m<3>, and the rigid polyurethane foaming plastic can maintain excellent thermal insulation properties and dimension stability and has a self-quenching function. The low-density conjugate polyether has the advantages of flexibility and convenience in construction and low cost, conforms to the requirements of energy conservation, emission reduction, safety, environmental protection of China and is an ideal material of the external wall thermal insulation field.