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Impregnating and encapsulating wax for circuit board of water meter and preparation method and application thereof

A technology for encapsulating wax and circuit boards, applied to printed circuit components and other directions, can solve problems such as poor performance and inability to meet use requirements, and achieve the effects of good performance, good adhesion and fluidity, and easy operation.

Active Publication Date: 2013-05-15
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The composition is relatively soft and is mainly used for the sealing and positioning of electronic tuners. When it is used for water meter circuit boards, it cannot meet the requirements of use.
Due to different purposes, the composition has poor performance when used for water meter circuit board encapsulation

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0033] Embodiment: (below all represent by weight percentage)

[0034] experiment method

[0035] The following test methods are the common methods for testing waxes used in the electronics industry used in the examples:

[0036] Dropping melting point GB / T 8026

[0037] Penetration GB / T 4985

[0038] Kinematic viscosity GB / T265

[0039] Dielectric constant GB / T 5654

[0040] Volume resistivity GB / T 5654

[0041] Dielectric loss factor GB / T 5654.

Embodiment 1

[0044] 80 # Microcrystalline wax, drop melting point 81.6°C, penetration 13 1 / 10mm (Jingmen Oil Refinery) 60%

[0045] 75 # Microcrystalline wax, drop melting point 76.2°C, penetration 20 1 / 10mm (Nanchong Oil Refinery) 20%

[0046] Polyethylene wax L-913, average molecular weight 2582 (Beijing Second Auxiliary Factory) 2%

[0047] Polyisobutylene, average molecular weight 1233 (Jinzhou Lubricating Oil Additive Co., Ltd.) 3%

[0048] Soft microcrystalline wax, dropping point 59.0°C, penetration 85 1 / 10mm (Hebei Feitian Petrochemical Co., Ltd.) 15%.

Embodiment 2

[0050] 85 # Microcrystalline wax, drop melting point 82.8°C, penetration 15 1 / 10mm (Nanchong Oil Refinery) 45%

[0051]70 # Microcrystalline wax, drop melting point 69.2℃, penetration 15 1 / 10mm (Jingmen Oil Refinery) 35%

[0052] Polyethylene wax L-913, average molecular weight 2582 (Beijing Second Auxiliary Factory) 2%

[0053] Polyisobutylene, average molecular weight 1233 (Jinzhou Lubricating Oil Additive Co., Ltd.) 5%

[0054] Soft microcrystalline wax, dropping point 59.0°C, penetration 85 1 / 10mm (Hebei Feitian Petrochemical Co., Ltd.) 13%.

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PUM

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Abstract

The invention discloses an impregnating and encapsulating wax for a circuit board of a water meter and a preparation method and application thereof. The impregnating and encapsulating wax is prepared by mixing and processing a petroleum wax, paste hydrocarbon, a butylene polymer, a macromolecular wax and the like in a specific ratio. The impregnating and encapsulating wax prepared in the invention has the characteristics of good insulating properties, moisture resistance, heat resistance, adhesiveness and fluidity, proper physical and chemical performances, good usage performance, no toxicity, no pollution, environment friendliness and the like and is applicable to impregnation and encapsulation of the circuit board of the water meter.

Description

technical field [0001] The invention relates to an impregnation encapsulation wax, which is especially suitable for the impregnation encapsulation of water meter circuit boards. Background technique [0002] The circuit board is a key component of various electrical appliances and equipment. The circuit board is usually exposed, so accidents such as short circuit and leakage may occur in a high-humidity environment, resulting in damage to electrical equipment. In the production process of water meter circuit boards, it is required to use impregnated encapsulation wax to impregnate and encapsulate the surface of the circuit board to achieve the purpose of insulation and moisture resistance. As a special wax for circuit boards, it must have good electrical insulation, moisture resistance, and temperature change characteristics that are compatible with the environment in which the circuit boards are used. Gas permeability and hygroscopicity are very small. Existing patents in...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L91/06C08L23/20H05K1/02
Inventor 李尚勇李莉郭慧兵
Owner CHINA PETROLEUM & CHEM CORP
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