The patch touch switch is well-known in the electronic industry, and it is also a kind of switch commonly used in the circuit. Today we will give you a detailed introduction, let the patch touch switch into our life, and let the patch touch switch appear some problems to solve a lot.
Tact Switch, also known as Tact Switch, originated in Japan, and its appearance was a reform of world industry. With the emergence of SMD production mode, electronic components began to develop and produce SMD products, so patch touch switch was developed and widely used. This switch is made of: base (plastic LCP material, both good temperature resistance), terminal (copper and silver have good conductivity), key handle (silicone handle and plastic handle), cover plate (covered with metal cover, plastic cover plate, film cover plate), shrapnel (copper and stainless steel, Pinzan Electronics is made of Japanese imported Shanyuan stainless steel shrapnel).
Customers of stainless steel shrapnel use environmental protection instruments to detect out-of-standard problems. Our company provides you with touch switch, micro switch, button switch, etc. The chromium element in your environmental protection instrument is beyond the standard. Because the shrapnel of touch switch used by our company is stainless steel shrapnel, the stainless steel material will contain chromium element. In the ROHS environmental protection requirements, cr+3 meets the environmental protection requirements, and if cr+6 is the environmental protection unqualified product. The stainless steel shrapnel used by our company is Cr + 3, not Cr + 6. Our company has test results in the report number of CANEC1419417401 which provides specifications ROHS. Therefore, our company guarantees that if the environmental protection is not up to standard, our company will take full responsibility.
Industrial liquid crystal polymer (LCP) was originally developed by DuPont Company in the United States as a soluble poly (p-phenylene terephthalamide) (Kevlar & reg;). Because this type of polymer can only be processed in solution, can not melt, can only be used as fibers and coatings, is a special engineering plastic raw materials.
Polymer Full Term
Liquid Crystal Polymer (LCP). It is a new type of high performance special engineering plastics developed in the early 1980s.
Summary
LCP is a new type of polymer with outstanding properties. LCP is a wide range of materials:
A. Lysotropic liquid crystals: need to be processed in solution;
B. Thermotropic liquid crystal: It can be processed in molten state.
Initially, the industrialized liquid crystalline polymer was developed by DuPont Company in the United States as a soluble poly (p-phenylene terephthalamide) (Kevlar & reg;). Because this type of polymer can only be processed in solution, not melted, it can only be used as fibers and coatings. The following contents only include thermogenic LCP.
LCP appearance: beige (also white opaque solid powder); LCP density: 1.35-1.45g/cm³.
LCP products
Classification of heat resistance of liquid crystal resins (low, medium and high heat resistance type), ASTM classification of types of heat deformation temperature / for example, Japanese classification grades of low heat resistance < 177 type I type III Vectra® A430, Rodrun® LC3000; medium heat resistance 177-243
Type II
Type II Zenite & reg; 6330, Vetra & reg; A130, Novaccurate & reg; E335G30, Sumikasuper & reg; E7000, Rodrun & reg; LC5000, Ueno LCP & reg; 1000;
High heat resistance > 243 III type I Xydar® - 930, Zenite® 6130 Vectra® C130, Ueno LCP® 2000, Titan LCP® LG431, Novaccurate® E345 G30
Representative Properties of High Heat Resistant Liquid Crystal Polymers
Brand Xydar & reg;
G-930 Titan & reg;
LG431 Zenite & reg;
7130 Zenite & reg;
6130 Vectra & reg;
E130i Vectra & reg;
C130
Relative density 1.601.63 1.66 1.67 1.61 1.62
Tensile strength/MPa 135 139 145 150 165 159
Bending Strength/MPa 172 170 174 170 221 214
Izod notched impact strength /(J/m) 96 299 160 123 208 176
Hot Deformation Temperature (1.82 MPa) / 271 275 289 263 276 255
LCP plastic materials are called LIQUID CRYSTAL POLYMER, and liquid crystal polymers in Chinese. It is a new type of macromolecule material, which generally exhibits liquid crystal properties in the melting state. These materials have excellent heat resistance and processing properties. The main method of polymerization is melt polycondensation, and the whole aromatic LCP is assisted by solid phase polycondensation to produce high molecular weight products. Non-total aromatic LCP plastics are usually prepared by one or two-step melt polymerization. The technology of continuous melt polycondensation to produce high molecular weight LCP has been developed. Tensile strength and flexural modulus can exceed the developed thermoplastic engineering plastics. Mechanical properties, dimensional stability, optical properties, electrical properties, chemical resistance, flame retardancy, processability are good, heat resistance is good, thermal expansion coefficient is low.
Application characteristics:
Characteristics
A. LCP has self-reinforcing property: it has unusually regular fibrous structure. Therefore, the mechanical strength and modulus of non-reinforcing liquid crystal plastics can reach or even exceed the level of tens of percent glass fiber reinforced ordinary engineering plastics. If reinforced with glass fibers, carbon fibers, etc., it is far more than other engineering plastics.
B. Liquid crystal polymers also have excellent thermal stability, heat resistance and chemical resistance. For creep characteristics of most plastics, liquid crystal materials can be neglected, and have excellent wear resistance and abrasion resistance.
C, LCP has good weather resistance, radiation resistance, excellent flame retardancy, and can extinguish fire without further combustion. Its combustion grade reaches UL94V-0 level.
D and LCP have excellent electrical insulation performance. Its dielectric strength is higher than that of general engineering plastics, and its arc resistance is good. In continuous use
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