摘要:
A method for producing a polyolefin foam sheet which includes heating a foamable base sheet comprising a polyolefin resin, a foaming agent, and a resin varnish. The resin of the varnish is selected from the group consisting of rosin, cumarone-indene resin, phenolic resin, alkyd resin, and shellac resin.
摘要:
A method producing a low-density flexible polyurethane foam comprising stirring a starting mixture containing a polyhydroxy compound, a polyisocyanate, a foaming agent and a catalyst to thereby foam the mixture, in which a foaming agent selected from the group consisting of water, formic acid and its salts is used in an amount of at least 10% by weight as water equivalent per 100 parts by weight of the polyhydroxy compound, and the mixture is stirred at 15.degree. C. or below by previously adjusting the temperature of the mixture to 15.degree. C. or below and under a highly catalytic activity.
摘要:
A method of making a foam product including the steps of reacting an isocyanate component with a polyol component and foaming with a foaming agent to form a self-supporting intermediate foam material. The isocyanate component is present in excess of a stoichiometric quantity needed to react with the polyol component. The self-supporting intermediate foam material is then contacted with water and the self-supporting, intermediate foam material is heated to form a foam product, the water reacting with the remaining unreacted isocyanate component. The self-supporting, intermediate foam material formed by the first foaming step is rigid or semi-rigid at room temperature but it can be softened by heating to enable it to be used for deep draw molding in a successive cure molding process without cracking, splitting or being destroyed. Once the self-supporting, intermediate foam material is contacted with water or steam in the final cure molding process to react the remaining isocyanate component, the material becomes a finally cured, rigid or semi-rigid foam material which will not soften on heating. The self-supporting, intermediate foam material can be laminated with facing materials or reinforced with glass fiber--non-woven cloth or the like to give a composite panel which exhibits stiffness, heat insulation, acoustic insulation, moisture resistance and is light in weight so that it can be used for a molded ceiling or door panel in an automobile or a partition or screen for interior use.
摘要:
Flexible urethane foams having a low density and capable of preventing spontaneous combustion during production and storage are produced by compounding 5.0-12.0 parts by weight based on 100 parts by weight of polyhydroxylcompounds, of water and not less than 0.1 part by weight of aromatic amine antioxidant, further preferably not less than 0.01 part by weight of phosphorous acid triesters in the usual combination of polyhydroxyl compounds, polyisocyanates, water, catalysts, surfactants, foaming agent and other additives.
摘要:
A moisture- and heat-resistant flexible polyurethane foam, which is free from lowering of the foam hardness due to moisture absorption during or after the production of the foam under a high temperature and high humidity condition and free from development of scorch during the production of the foam, can be obtained by adding an amino acid or an amino acid analogous compound to a raw material mixture, and foaming the resulting mixture.
摘要:
Polyol component essentially consists of polyesterpolyetherpolyol containing polyesterpolyol by the weight ratio of 100:0 to 20:80, in which the polyesterpolyetherpolyol is a copolymer of polytetramethyleneglycol (PTMG) and .epsilon.-caprolactone by the weight ratio of 20:80 to 80:20 with an average molecular weight of 1000 to 3000 and the polyesterpolyol is a condensate of adipic acid as a main acid component with an average molecular weight of 1000 to 3000, is reacted with isocyanate component essentially consists of 4,4'-diphenylmethanediisocyanate (MDI) to make a prepolymer with terminal radical of NCO.Microcellular polyurethane produced from the prepolymer by foaming and polymerization reaction has the durability for vibration-proof material of car use, combining the advantage of PTMG such as high initial modulus at elongation, low heat built up, low-temperature property and hydrolysis-durability under high humid and hot conditions, with the advantage of polycaprolactone such as good molding property and anti-bending-fatigue property, as well as making up for the disadvantage of both polyols each other. Thus improving the problems of microcellular polyurethane using MDI such as low initial modulus at elongation and high heat built up.
摘要:
Under emergency, a valve body (26) displaced from a closed position (42) to an open position (43) in association with melting of a fuse member (28) receives resultant of pressing forces of a primary pressure (P1) of gas guided through a primary port (56) in an opening direction (X1) in a state where the valve body (26) is disposed at the position closer to the open position (43) including a fluid driving start position between the closed position (42) and the open position (43). The valve body 26 receives smaller resultant of the pressing forces of the primary pressure in the opening direction (X1) in a state where the valve body (26) is disposed at the position closer to the closed position (42) than to the fluid driving start position than the resultant of the pressing forces received by the valve body (26) in the state where the valve body (26) is disposed at the position closer to the open position (43) including the fluid driving start position. In this manner, it is possible to provide a compact relief valve device capable of suppressing a pressing force applied to a displacement preventing means for preventing the opening operation under normal condition and of achieving a quick opening operation under emergency condition.
摘要:
A polyurethane seat pad having a center seat portion and bank portions therearound is molded by using a mold defining a cavity having a center region corresponding to the center seat portion and side regions corresponding to the bank portions, placing collecting vessels of expanded polyolefin in the side regions of the mold cavity, pouring a foamable polyurethane liquid for low hardness foam into the cavity between said collecting vessels, pouring a foamable polyurethane liquid for high hardness foam into said collecting vessels, and causing the foamable liquids to expand, thereby producing a polyurethane seat pad having the collecting vessels embedded therein. The expanded polyolefin is a crosslinked polyolefin foam having an index of surface wetting of at least 36 dyne/cm. The seat pad in which the bank portions have higher hardness than the seating portion and which is fully durable against repetitive loading can be produced to the desired configuration in a stable manner.
摘要:
A method of producing a developing roller applicable to a developing device included in an image forming apparatus and capable of carrying a great amount of toner thereon by generating microfields. The surface of a conductive base is covered with a net constituting of conductive fibers and dielectric fibers woven together. The fibers are heated by a heater to melt with the result that conductive portions and dielectric portions appear on the surface of the developing roller.
摘要:
In a portable exercise tracking system, a method and apparatus for measuring power output of exercise motion by a user. The system includes a wireless motion sensor and a wireless central mass unit. The wireless motion sensor detects, measures and transmits motion data associated with a first motion by the user. The central mass unit detects and measures motion data associated with a second motion by the user. The central mass unit also computes the power output of the first motion and the second motion as a function of the first motion data and the second motion data. The disclosed method and apparatus provides a more effective means of computing total power output of a user performing free body exercises.