摘要:
Epoxy resin mixtures for producing prepregs and composites that are available at low cost and can be processed well yield flame-retardant molding materials even without the addition of flame retardants, and these molding materials have a high glass transition temperature and also have an improved interlaminar adhesion and adhesion to copper when they contain the following components:a phosphorus-modified epoxy resin with an epoxy value of 0.02 to 1 mol/100 g, composed of structural units derived from(A) polyepoxy compounds with at least two epoxy groups per molecule and(B) phosphinic acid anhydrides and/or phosphonic acid anhydrides, andan aromatic polyamine as the hardener.
摘要:
The invention provides epoxy resin compounds for manufacturing prepregs and composite materials, which can be obtained inexpensively and have good processibility, and provide--without having to add flameproofing agents--virtually inflammable molded materials with a high glass transition temperature. The epoxy resin compounds contain the following constituents:(A) an aromatic and/or heterocyclic polyepoxide resin that is free of phosphorous, optionally in a mixture with an aliphatic epoxy resin;(B) an epoxy-group-containing phosphorous compound and(C) an aromatic polyamine as a curing agent.
摘要:
Reaction resin mixtures which can be economically processed provide inflammable molded materials with excellent mechanical properties and high dimensional stability under heat when they contain the following constituents: (A) a phosphorus-free polyfunctional epoxide; (B) an epoxy-group-containing phosphorus compound; (C) a polyfunctional isocyanate; (D) a curing catalyst; and, if required, (E) filler material.
摘要:
The invention provides epoxide resin molding compositions for protectively covering semiconductor components, which are accessible in a cost-effective manner and have good processibility. The epoxide resin molding compositions provide virtually inflammable molded materials with a high glass transition temperature and a low thermal expansion coefficient without the addition of flameproofing agents, when they contain the following constituents:(A) an aromatic and/or heterocyclic polyepoxide resin which is free of phosphorous, optionally in combination with an aliphatic epoxide resin;(B) an epoxide-group-containing phosphorous compound;(c) an aromatic polyamine as a curing agent; and(D) filler material.
摘要:
In an electrical lamp, whose envelope is closed by a pinch of rectangular cross-section, through which current-supply conductors are passed and which is supported in a cap between inwardly projecting parts, which seize around the narrower side faces of the pinch, according to the invention, one of the current supply conductors is bent backwards with its part projecting from the pinch along one of the narrower side faces and is clamped between pinch and lamp cap. Thus, it is possible to use a cap having only one bottom contact and nevertheless to secure the lamp envelope to the cap without additional means.
摘要:
Prepregs can be prepared by impregnating reinforcement materials such as glass, carbon or plastic (in the form of fibers or nonwoven or woven materials) with a solution of a polyepoxy resin and a polyamine as a hardener and subsequent drying. For the manufacture of storage-stable prepregs based on polyepoxy resins, 1,3,5-tris(3-amino-4-alkylphenyl-2,4,6-trioxo-hexahydrotriazine with a C.sub.1 - to C.sub.4 alkyl radical is used as the hardener. The new method leads to storage-stable prepregs and assures that composite materials, especially circuit boards, manufactured therefrom meet the requirements for these materials.
摘要:
In a feed pump (2) designed as a peripheral or side channel pump, guide vanes (9, 11, 12) arranged in an impeller (4) have a different angle of inclination in the radially inner region from the radially outer region. As a result, the characteristic curve of the feed pump (2) can be modified simply by exchanging the impeller (4). By virtue of the invention, the feed pump (2), whilst having an intended feed pressure and volume flow, can be set to particularly high efficiency, depending on the viscosity of the liquid to be fed.
摘要:
The light bulb of a lamp/reflector unit is mounted in spaced relation to the reflecting surface of the reflector member by means of mounting clips which engage in a clamping manner around a respective narrow side face of the pinch seal of the light bulb. Support wires are secured to the mounting clips, with which wires the light bulb is suspended in the reflector member.
摘要:
The invention relates to a construction of a lamp/reflector unit which is simple and which permits of connecting the light bulb in an aligned position very rapidly.For that purpose the light bulb has a metal support plate to which are fixed metal support pins by means of respective metal flanges. After the light bulb has been adjusted to a defined position with respect to the metal support pins, the metal support plate is secured to the metal flanges by soldering or welding.
摘要:
A method for maintaining a sealed beam lamp unit comprising a quartz iodine lamp accommodated in an outer envelope. A sleeve-shaped cap which is made of a metal strip material surrounds the lamp pinch which is substantially rectangular in cross-section and to which a wire is secured which serves as the sole support for the lamp.