Three bumper painted - primer baking process of _3 -

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Three painted bumper - Primer of drying process

However, in the construction applications,[link widoczny dla zalogowanych], particularly in some of the manual spraying of the bumper production line, as easily lead to improper construction and primer overspray film thickness is not enough phenomenon. The following cases, for there is a \First floor plan microscope observation, found that black projection suspected foreign body (Figure 3a). Can be observed using an optical microscope the location and size of the black shadows, especially in the longitudinal section of the sample analysis can be clearly derived from coats the surface of the particle (Figure 3b). Meanwhile, there are defects on the sample and no defects were thickness measurements (Table 6). Varnishes primer, coated plastic substrate (a) (b) (a) optical microscope using 0lympusszx12 coaxial light source to observe the sample surface: (b) optical microscope using DM-RM sample from the side of the observation section of the coating and paint coating paint defect analysis in Figure 3 on the Wu Chi 11: Bumper painted a three-primer baking process of film thickness at different positions in Table 6 primer, paint varnish coating 47 Table 6 1526163O we can see: the whole sample thickness and thin paint, especially those with defects. Recommended that the coating thickness is a l5 l0 Xiu. Bumper in after spraying, the paint primer paint mist point fall over the surface of the wet film spraying. When the varnish after spraying,[link widoczny dla zalogowanych], the overspray caused by different positioning of aluminum powder at the different light reflection, so more defects observed. In the wet-wet process, an appropriate increase in the thickness of paint, primer can keep the surface moist, help eliminate paint overspray and \2.2.3 conductive primer in automotive exterior parts 3C1B coating process in order to improve utilization of the paint film while maintaining excellent appearance and performance of materials in the paint need to focus to consider the following two points: (1) use of electrostatic spraying; (2) Since the PP matrix itself is not conductive, the conductive coating needs. In other words, the conductive coating by electrostatic spraying in the spinning cup conductive primer, paint to achieve the optimal utilization (Table 7). Table 7 Optimization of paint usage Note: Painting consumption = (area �� dry film coating dry film thickness �� density), (solid content �� coating efficiency); VOc = amount of solvent coating consumption �� 7 from the table It can be seen: on conductive primer, paint spraying using electrostatic spinning cup ESTA,[link widoczny dla zalogowanych], the effective utilization of the paint from 3O% to about 70%. Because the conductivity of conductive primer side is painting parts processing applications in the construction process control. All automobile manufacturers currently bumper primer conductivity value for no clear indicators and detection methods. Different manufacturers for the primer coating conductivity detection method is different. \ In order to ensure effective testing data, representation, the provisions of BASF Coatings Laboratory baking in 80 �� 30min after the dry film on the sample resistance measurement. BASF is one component to the conductive primer Jc5O a 907O, for example, the dry film resistance can be controlled in 350kQ below. The bumper itself is not conductive substrate,[link widoczny dla zalogowanych], the conductive primer by adding a middle layer, thereby increasing the utilization of the paint finish paint. In addition, because 3c1B completely wet-wet process coating line for line resistance measurement method is also put forward different demands. For example, a bumper BASF Coatings in the domestic production line using the test methods shown in Figure 4 (testing equipment: ITwRanurg76634-00). Primer line measurement of film resistance, as an effective means of detection, but also for the bumper color and appearance of the final coating to provide a basis for control. Test point distance of 2.5cm! Spraying conductive primer _J flash dry the prescribed time measurements, such as 5mjn'1omjnI. 2.5cm0J flash dry the stipulated time measurements, such as 5mjn1omjnJ Figure 4 line measurement of resistance 3 Conclusion paint the future requirements of automotive exterior parts are: (1) Environmental good (low v0c emissions,[link widoczny dla zalogowanych], no heavy metals, water-based ); (2) excellent film properties (high decoration I students, high weather resistance); (3 shares of energy-saving equipment investment, high efficiency (low paint consumption, low energy consumption, less process). bumper 3clB application process, For the implementation of global and local environmental regulations have a very positive meaning. in which the continuous development of plastic conductive primer and improvement will be the development of automotive exterior parts paint one of the trends.

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