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PP板焊接的特点

 

日期:2019年08月22日 新闻来源:www.hbppcj.com 浏览:

 

   我们知道塑料焊接就是用塑料做成板材,塑料为合成的高分子化合物,可以自由转变形体样式。它具有精良的化学稳定性,耐腐化性强,硬度大,强度高,防紫外线是可以耐老化的,耐火阻燃,绝缘性能可靠,表面光洁,平整,不吸水,稳定形,易于加工等优点,是头等的热成型材料,能替换部分不锈钢和别的耐腐化合成材料,被遍及用于化工,煤油,电镀,水污染处理设备,环保设备,矿山,电子线路板,防火板模板,修建模板及告白装潢等行业。塑料板也区分为泛用性塑料及工程塑料,主要是用处的遍及性来界定,如PE、PP板代价自制,可用在多种不同型态的呆板上生产。工程塑料则代价较昂贵,但原料稳性及物理物性均好许多,一样平常而言,同时具有刚性与韧性两种特性。有精良的耐腐化性,强度高,硬度大,易加工和焊接等特点,遍及用于做酸碱池子,萃取容器,等化工,水处理,环保设备等。塑料是利用单体原料以合成或缩合反应聚合而成的材料,由合成树脂及填料、增塑剂、稳定剂、光滑剂、色料等添加剂组成的,它的主要成分是合成树脂。
    对于PP板材来说,在其制造、加工、贮存及应用过程中,对氧化降解都有一定的敏感性,少量的氧就能使这些高分子材料的强度、外观和性能发生剧烈的变化。在氧化降解中,PP板材与氧化反应是一个自动催化过程,反应初期为氢过氧化物,它在一定条件下,分解成自由基,该自由基又能与大分子烃或氧反应生成新的自由基,周而复始,使氧化反应进行。PP板材的氧化都是按这一机理进行的。光能和热能既是产生初期自由基的能源,又能够加速氢过氧化物的分解,从而加快了氧化的进行,因此,通常又将PP板材的氧化分为热氧化和光氧化。一些变价金属离子如锰、铁、钴、镍、铜等,通过电子转移也可催化氢过氧化物的分解。氧化过程中,随着在PP板材链上过氧化物和其它含氧基团的形成,将发生大分子链的断裂,但在链终止阶段,自由基的结合又会引起聚合物的交联,无论是断链还是交联,材料的力学性能都将变得更差,各种差羰基化合物的形成和积累又会引起材料变色。那么怎样防止氧化?从上面分析,氧化起于分子链上C-H断裂,氧化的速度取决于这种断裂的难易。化学键的断裂很难用外界方法来限止,要抑制其PP板材的氧化,一般通过改变其化学结构来实现,即消除结构中的不稳定基团,合成具有内在抗氧性的聚合物。但是这种方法实现的不多,而且价格昂贵,对性能也有损失因此,目前应用较多的是采用简便而有效的添加位氧剂的方法。

We know that plastic welding is made of plastic and plastic is a synthetic polymer that can freely change the shape of the form. It has excellent chemical stability, strong corrosion resistance, high hardness, high strength, anti-ultraviolet radiation can be aging resistant, fire resistant, reliable insulation performance, surface clean, flat, non-absorbent, stable shape, easy to process and other advantages, It is a first-class heat-forming material that can replace some stainless steel and other corruption-resistant synthetic materials. It is used in chemicals, kerosene, electroplating, water pollution treatment equipment, environmental protection equipment, mines, electronic circuit boards, fire board templates, construction templates, and advertising. Decoration and other industries. Plastic sheets are also divided into generic plastics and engineering plastics, which are mainly defined by the pervasiveness of use. For example, PE and PP plates are self-produced at cost and can be produced on a variety of different types of stiffness. Engineering plastics are more expensive, but the material stability and physical properties are much better. As usual, they have both rigid and ductile properties. It has excellent corrosion resistance, high strength, high hardness, easy to process and weld, etc.. It is used in acid-base ponds, extraction containers, and other chemicals, water treatment, and environmental protection equipment. Plastics is a material formed by the synthesis or condensation of monomer raw materials. It consists of synthetic resins and additives such as fillers, plasticizers, stabilizers, smooth agents, and color materials. Its main component is synthetic resin.
For PP plates, they are sensitive to oxidative degradation during their manufacture, processing, storage, and application. A small amount of oxygen can cause dramatic changes in the strength, appearance, and performance of these polymer materials. In oxidative degradation, the reaction of PP plates with oxidation is an automatic catalytic process. The initial reaction is hydrogen peroxide. Under certain conditions, it decomposes into free radicals. The free radicals can react with macromolecular hydrocarbons or oxygen to produce new free radicals., The oxidation reaction is carried out. The oxidation of PP plates is carried out according to this mechanism. Light energy and heat energy are both the energy that produces the initial free radicals, and they can accelerate the decomposition of hydrogen peroxide, thus accelerating the oxidation. Therefore, the oxidation of PP plates is usually divided into thermal oxidation and light oxidation. Some valence metal ions such as manganese, iron, cobalt, nickel, copper, etc., can also catalyze the decomposition of hydrogen peroxides through electron transfer. During the oxidation process, with the formation of peroxides and other oxygen-containing groups on the PP plate chain, the fracture of the macromolecule chain will occur, but at the end of the chain, the binding of free radicals will cause the crosslinking of polymers, whether it is a chain break or crosslinking, The mechanical properties of the material will become worse, and the formation and accumulation of various poor carbonyl compounds will cause the material to change color. So how to prevent oxidation? From the above analysis, the oxidation starts at the C-H fracture on the molecular chain, and the speed of oxidation depends on the ease of such fracture. The fracture of the chemical bond is difficult to limit by external methods. To inhibit the oxidation of its PP plate, it is generally achieved by changing its chemical structure, that is, eliminating the unstable groups in the structure and synthesizing a polymer with intrinsic antioxidant properties. However, this method is not implemented much, and the price is expensive. There are also losses in performance. Therefore, the most commonly used method is to use a simple and effective method to add oxygen.

 

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