Lamp solder paste

Abstract

The invention discloses a lamp holder welding paste prepared from rosin, shellac, 217 phenol-formaldehyde resin, ethyl alcohol, thermal-conductive carbon fibers, a zinc sulfide powder, a barium sulfate powder, a calcium carbonate powder and silicon modified polyurethane. The welding paste can maintain a paste state for a long term, is not easy to dry, can be well attached on a foam body root, has low curing temperature and fast heat conduction, improves the finished product rate of welding of lamp bulbs and lamp holders, and extends the lamp bulb service life.

Description

technical field [0001] The invention relates to a composition, in particular to a lamp cap welding paste used in the production of electric lamp bulbs for coating on bulbs and capable of welding the bulb and the lamp cap together. Background technique [0002] In the production of electric lamps, especially automotive lighting lamps, the filament and the light pole are welded and put into the bulb body for sealing. Heating welds the hair bulb on the lamp head. The existing welding paste is generally in the form of powder, and its composition mostly contains phenolic resin, shellac, rosin and some inorganic fillers. When used, it is mixed with alcohol into a paste, and then applied to the lamp holder, and then inserted into the hair bubble for heating and curing to achieve adhesion. catch. This kind of welding mud powder has many inconveniences and disadvantages in use. For example, the alcohol is easy to volatilize after being mixed with alcohol, so that the welding mud is...

AI Technical Summary

Problems solved by technology

This kind of welding mud powder has many inconveniences and disadvantages in use. For example, the alcohol is easy to volatilize after being mixed with alcohol, so that the welding mud is easy to dry before the hair bubble is inserted, and it is easy to diverge and fall off after the hair bubble is inserted. The melted solder paste is not easy to deform after the hair bubble is inserted and sticks to the root of the hair bubble, so that the local thickness is uneven. When heating and solidifying, the thick part of the solder paste will expand more and cause a greater impact on the foam glass at the corresponding position. Stress, and the thin part of the solder paste has a small stress and even some places where the solder paste is so thin that it cannot touch the bubble body, and the bubble body may crack the glass immediately or after a period of use under uneven stress conditions, resulting in higher waste products efficiency or short service life; the thermal conductivity of the existing solder paste is small after solidification, so that the heat generated when the bulb is lit can only be dissipated through the bulb body, and it is not easy to transfer to the lamp holder through the solder paste for heat dissipation, which ultimately affects Lamp life

In addition, the temperature when the existing solder paste is solidified is generally above 200°C, which is not conducive to energy saving and consumption reduction

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