黄大仙精选资料二四六

气候对双组份打胶机的胶水都有哪些影响?

发布时间:2019/12/18    发布人:

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双组份打胶机
  In short, the climate change that affects the composite season is also the change of two major indexes of environment humidity and temperature: specifically, in spring and summer, especially in rainy season, the relative humidity of air is large, and even can reach saturation, while in autumn and winter, the air is dry and the humidity is small; in terms of temperature, summer is much higher than winter, and the maximum difference between the two can be close to 30-40 ℃ (in the South Region For example). If we don't pay attention to these differences, we may encounter the following problems in the preparation: when the air is wet, the glue often can't be completely cured, that is, it can't be completely dried, the residual viscosity is large and serious, and even the wire drawing phenomenon will occur when the composite film is peeled off, especially when the film itself has strong moisture absorption, for example, when nylon film is used for composite, this phenomenon is simpler; secondly, moisture The wet air will condense on the rubber roller, thus bringing water into the rubber basin. Over time, the glue will gradually become confused and white, thus losing the bonding effect. High temperature and humidity also make the glue difficult to preserve. If the working gel is not used up on the same day, it tends to turn white and agglomerate into a gel (jelly) gel. On the contrary, when it is cold in winter, the previously unused working adhesive will adhere to excellent transparent fluidity overnight, and can even be used directly on the machine without batch mixing in the newly prepared working adhesive. On the other hand, when the temperature is low in winter, the glue will thicken and the fluidity will decrease. When the laminating machine is running at high speed, a large number of bubbles simply accumulate on the glue surface and the edge of the upper glue anilox roll. At this time, there may be bubble transfer. Due to the insufficient amount of glue, the composite fastness may be affected. At the same time, due to the poor smoothness and relaxation of the composite film, the appearance of the composite film is also poor. For example, the flow pattern of glue is relatively obvious, sometimes in the form of orange peel. When it is used for lamination, if there is a large area of white ink or light color ink on the printing surface, small white spots and spots are more likely to form when the aluminum foil or aluminum coating is combined; otherwise, due to the low temperature in winter, the temperature of the curing room is very different from the external environment temperature. If the insulation method is not in place, the heat loss rate is far faster than that in high-temperature summer, which often makes the temperature in the curing room not reach the set temperature (generally 50 ℃). Therefore, ripening effect is also affected to some extent. In the same mature period, the composite fastness may be lower than that in summer.
  为了分析上述现象的原因,有必要了解湿度和温度对胶粘剂的影响。首先,双组分聚氨酯胶粘剂的含水量与主剂聚酯/聚醚多元醇相同,可与固化剂中的NCO基团发生反应。估计1g水可消耗26-32g固化剂。当然,这是纯响应分量比。实际上,工作胶中的水与固化剂反应时,与主剂竞争。然而,无论反应中涉及多少水,都无疑会消耗固化剂,使固化剂与主剂之间的反应量达不到原来设定的工作比,从而形成不完全固化和残余粘度。然而,胶粘剂的粘度和反应性与温度密切相关。用旋转粘度计在25℃的标准温度下测量胶粘剂制造商给出的粘度值,这意味着在实践中,夏季工作环境的温度比夏季高出10度以上,而冬季工作环境的温度可能比寒冷天气低20度。胶的粘度与温度正好相反,即,当温度较高时,同一胶的粘度值较低,流动松弛性好,温度低时粘度高,流动性好。
  In order to analyze the causes of the above phenomena, it is necessary to understand the influence of humidity and temperature on the adhesive. Firstly, the moisture content of two-component polyurethane adhesive is the same as that of polyester / polyether polyol, which can react with NCO group in curing agent. It is estimated that 1 g of water can consume 26-32 g of curing agent. Of course, this is the pure response component ratio. In fact, when the water in the working adhesive reacts with the curing agent, it competes with the main agent. However, no matter how much water is involved in the reaction, the curing agent will undoubtedly be consumed, so that the reaction amount between the curing agent and the main agent can not reach the original set working ratio, thus forming incomplete curing and residual viscosity. However, the viscosity and reactivity of adhesives are closely related to temperature. The viscosity value given by the adhesive manufacturer is measured with a rotary viscometer at a standard temperature of 25 ℃, which means that in practice, the temperature of the working environment in summer is more than 10 ℃ higher than that in summer, while the temperature of the working environment in winter may be 20 ℃ lower than that in cold weather. The viscosity of the glue is opposite to the temperature, that is, when the temperature is high, the viscosity of the same glue is low, the flow relaxation is good, the viscosity is high and the flow is good when the temperature is low.
  以上就是对季节的气候对双组份打胶机中胶水都有哪些影响的介绍,想要了解更多欢迎访问官网http://emikasarl.com
  The above is an introduction to the influence of seasonal climate on the glue in the two-component dispenser. For more information, please visit the official website http://emikasarl.com