济南广告字材料性能的比较

页面更新时间:2015-08-12 11:33 来源:未知 作者:admin 点击:

 1. 导热系数

1 heat conduction coefficient

作为关键技术指标,目前各个厂家的材料,导热系数是最受用户关注的。而测试导热系数的技术标准却各不相同,有ASTM E 1530、ASTM E1461,某某公司自性定义的标准,等等。即使在同样的技术标准下,测试手段又有所不同,比如有平板法,激光法,在不同的测试手段情况下,最后的测试结果误差范围是完全不同的。通常激光法的精度要比平板法高,而激光法涉及的设备基本依赖进口,价格昂贵。

As a key technical indicators, the current manufacturers of materials, thermal conductivity is the most concern of the user. While testing the thermal conductivity of the technical standards are not the same, there are E ASTM 1530, E1461 ASTM, a certain company since the definition of standards, and so on. Even under the same technical standards, the test methods are different, such as the plate method, laser method, in different test methods, the final test results error range is completely different. The accuracy of the laser method is higher than that of the plate method, while the laser method involves the import of equipment, and the price is expensive.

正是由于上述种种原因,光看导热系数的大小会导致用户进入误区。济南广告字 / 比较现实的做法是:在相同的模具上,对不同厂家的导热塑料注塑成型,然后装配同样的灯板和电源,通电后测试灯珠的引脚温度或接近引脚的铝基板温度,温度低即为散热更优的材料。

It is due to the above reasons, the size of the light to see the size of the thermal conductivity will lead to the user to enter a misunderstanding. Jinan advertising words more realistic approach is: in the same mold, different manufacturers of the conductive plastics injection molding and assembly the same lamp board and the power supply, electricity test lamp pin temperature or close to the pin of the aluminum substrate temperature and low temperature is better heat dissipation material.

还有一种做法是,导热塑料供应商通常会提供标准的公模产品,可以同样的规格尺寸(比如A19 球泡灯)的散热器来比较公模的散热效果,从而大致判断材料的性能高低。

There is another way, the thermal conductive plastics supplier will usually provide a standard of the product, can be the same size (such as A19 bulb lamp) of the radiator to compare the thermal effect of the public, so as to determine the performance of the material.

2. 材料流动性

2 material flow

通常会用熔融指数来表示。流动性好的导热材料,其成型比较容易,生产较为顺畅。基于流动性高的导热塑料,散热器的壁厚可以设计比较薄,通常为1-1.2mm, 由于薄的壁厚又会造成散热路径的缩短,从而提高散热效果。同时,较薄的壁厚又会减低材料的克重,降低材料成本。如果是流动性差的材料,通常不太容易注塑成形,而且会容易损坏模具,增加模具维护费用。

It is usually expressed as a fusion index. Good flow of heat conduction material, which is easy to form, the production is more smooth. Based on the high thermal conductivity of plastic, the wall thickness of the radiator can be designed to be thin, usually 1-1.2mm, due to the thin wall thickness and can cause the cooling path to shorten, so as to improve the heat dissipation effect. At the same time, the thinner wall thickness will reduce the weight of the material and reduce the material cost. If it is the poor liquidity of the material, it is usually not easy to injection molding, and will easily damage the mold, increasing the cost of mold maintenance.

3. 成型收缩率

3 molding shrinkage rate

通常在厚度为3mm 条件下,合格的成型收缩率应该在0.5%以下,大于0.8%会对散热器尺寸精度产生不利影响。成型收缩率应越小越好。如选用较高成型收缩率的材料,将不得不增加壁厚来弥补。

Under the condition that the thickness is 3mm, the qualified molding shrinkage rate should be lower than 0.8%, which is more than 0.5%. The smaller the molding shrinkage rate. Such as the use of higher molding shrinkage rate of the material, will have to increase the wall thickness to compensate.

4. 机械性能

4 mechanical properties

导热塑料散热器的机械强度取决于济南广告字几个关键指标: 悬臂梁缺口冲击强度,抗拉强度,弯曲强度,通常可以比较不同材料的指标,指标数值越大越好。机械性能优异的导热塑料,可以在散热器结构中加入卡扣设计,使得PC罩或透镜与散热器的接口通过卡扣来实现,从而避免完全依赖粘胶来固定。粘胶的问题在于:需要固化时间,延长交货时间,同时胶水在高温下容易雾化,影响出光效果。

The mechanical strength of the heat conduction plastic radiator depends on the key index of Ji'nan advertising words: the notched impact strength, tensile strength, bending strength of the cantilever beam, and the bending strength of the material can be compared. Excellent mechanical properties of heat conductive plastics, can be added in the radiator structure design, such as the PC cover or lens and the heat sink through the interface to achieve, so as to avoid completely dependent on adhesive to fix. The problem is: the need to cure time, to extend the delivery time, while the glue at high temperature, easy to atomization, the effect of light.

5. 阻燃特性

5 flame retardant properties

关键有两点,第一、是否符合UL94 V0 阻燃等级,对出口美国市场会比较关键,第二,是否无卤素阻燃,简单的说,阻燃剂中不要含有卤素,否则材料的环保等级会下降,较难通过欧洲RoHS, REACH 指令。

The key has two points, first, whether in the V0 UL94 level, the export of the United States market will be more critical, second, whether halogen free flame retardant, simple said, do not contain halogen, or material of the environmental protection level will decline, more difficult to pass through the European REACH, RoHS directive.

6. 绝缘特性

6 insulation characteristics

导热塑料的一个好处是绝缘安全性,如果注塑好的散热外壳,可以承受3500V以上的高压,那过安规测试应该很容易。匹配这样的绝缘外壳,可以选用的灯板、电源方案可以比较灵活,包括:高压线性灯珠+高压线性电源,非隔离电源+中功率灯珠。具体的参数可以参考介电强度。

One of the benefits of thermal conductive plastics is the insulation safety, if the injection of good heat dissipation shell, can withstand 3500V above the high pressure, it is easy to test. Matching such insulation shell, can choose to use the lamp panel, power supply scheme can be more flexible, including: high voltage linear lamp + high voltage linear power supply, non isolated power supply and power beads. Specific parameters can refer to the dielectric strength.

7. 热膨胀系数

7 thermal expansion coefficient

如果在散热器结构中采用塑包铝的结构,应考虑外层导热塑料和内层铝合金的膨胀系数差异,铝合金的热膨胀系数为:0.000024 mm/mm*k,导热塑料的膨胀系数应在相同的数量级别,否则会造成不能同步热胀冷缩,导致散热器外壳开裂。

If in the structure of the radiator of the plastic coated aluminum structure, consideration should be given to the outer conductive plastic and an inner layer of aluminum alloy expansion coefficient difference, aluminum alloy thermal expansion coefficient is 0.000024 mm/mm*k, conductive plastic expansion coefficient should be in the same order of magnitude, otherwise it will cause not synchronous expansion and shrinkage of the and lead to cracking of the heat radiator casing.

三、 价格

Three, price

导热塑料作为塑料的一个类别,首先遵循以量论价的规律。同时也应看到,影响价格的因素也是和材料密度息息相关的,较低密度的材料其实是降低了单位成本。另外,注塑中的料杆部分,能否粉碎后再次注塑利用,其实也是对价格有一定影响。

As a category of conductive plastic plastic, first of all to follow the amount of price law. At the same time, it should also be seen that the impact of price factors and material density is closely related to the lower density of the material is actually lower unit costs. In addition, the material in the injection molding part, can be used after smashing the injection again, in fact, is also a certain impact on prices.

四、 增值服务

Four, value-added services

作为导热材料的供应商,能否为客户提供热模拟测试服务,将会给客户的定制散热器是否散热合格做一个参考判断。从而避免开模完成后,发现散热不合理再修改模具,也因此可避免盲目开模的风险

As a supplier of heat conduction material, can provide customers with heating simulation testing services, will give customers a custom radiator cooling qualified to do a reference. In order to avoid opening after the completion, found unreasonable to modify the mold cooling, also it can avoid the risk of blind mold