| 橡胶脱模剂脱模机理 |
| 添加时间：2018/7/4 17:17:18 浏览次数： |
| 橡胶脱模剂脱模机理 Demoulding mechanism of rubber mold release agent （一）脱模历程 (1) the process of demoulding 在模具表面喷涂脱模剂之后, 硫化成型时的实际界面如图一。在图一中, 胶料与脱模剂的接触面为A 面, 脱模剂面为B 面, 脱模剂与模具的接触面为C 面; 脱模剂层为凝聚层。脱模时, 当在A 面和C 面剥离时称为界面剥离, 而在B 面剥离时叫做凝聚层破坏。 After spraying the mold release agent on the mold surface, the actual interface during vulcanization molding is shown in Figure 1. In Figure 1, the contact surface between the rubber and the release agent is A, the mold release surface is B, the contact surface between the release agent and the mold is C, and the release layer is the coacervation layer. When stripping, it is called the interface peeling when the A surface and the C surface are stripped, and when the B surface is stripped, it is called the cohesive layer failure. （二）脱模剂转移率 (two) transfer rate of demoulding agent 脱模剂的转移率, 是指脱模剂在脱模过程中转移到成型产品上的百分率。 The transfer rate of release agents refers to the percentage of mold release agents transferred to molded products during the stripping process. ( 1) 由A 面剥离脱模, 脱模剂不转移; (1) stripping and stripping by A surface, and the demoulding agent does not transfer. (2) 由A 面剥离及B 面凝聚层破坏脱模, 脱模剂发生少量转移( 约22%) ; (2) the stripping of A surface and the destruction of B surface condensed layer resulted in a slight transfer of the release agent (about 22%). ( 3) 只因凝聚层的破坏而脱模, 脱模剂转移较多( 约44% ~ 70%) ; (3) demoulding is caused only by the destruction of the cohesive layer, and the demoulding agent is transferred more (about 44% ~ 70%). ( 4) 由B , C 面剥离及凝聚层的破坏而脱模,引起大量脱模剂转移( 约93%) ; (4) demoulding from B, C surface peeling and cohesive layer failure, resulting in a large number of release agents (about 93%). ( 5) 成型物与脱模剂接触, 发生混和、粘接, 当勉强脱模时, 就会使部分成型物( 产品) 的表面、界面破坏而脱模。通常使用的脱模剂, 要求在B 面或A, B 2 面剥离脱模。由凝 聚层引起的脱模, 其脱模效果最好。 (5) the contact between mold and mold release agent occurs mixing and bonding. When the mold is released, the surface and interface of some products (products) will be destroyed and demolding. Commonly used release agents require stripping on the B surface or A, B 2 sides. The demoulding caused by the condensed layer is the best. （三）脱模剂表面张力 (three) surface tension of demoulding agent 脱模剂的隔离性取决于其表面性质, 而表面不湿润性物质的物性值是根据其临界表面张力( rc ) 的概念得出的。rc 的测定方法是在被测物质的表面上滴上表面张力不同的几种物质的液滴,测出它们的接触角θ。用被测物质的表面张力与其接触角θ的余弦值cosθ作图得一直线, 延长这条直线和纵坐标相交, 其交点对应的横坐标值就是被测物质的表面张力值, 也叫该物质的临界表面张力r c。这个值有表示: 当物质表面上液体表面张力r L 大于物质的临界表面张力r c 时, 液体不湿润物质的表面; 当r L< r c时, 液体就会湿润物质的表面。因此, 临界表面张力小的物质作脱模剂, 是隔离性最好的脱模剂 The isolation of the release agent depends on its surface properties, and the physical properties of the surface non wetting material are derived from the concept of its critical surface tension (RC). The determination of RC is to drop droplets of different surface tension on the surface of the tested substance and measure their contact angle theta. The surface tension of the measured material and the cosine value cos theta of the contact angle theta are drawn in a straight line, and the line and the ordinate are intersected. The corresponding coordinates of the intersection point are the surface tension values of the measured material, also called the critical surface tension R C of the material. This value indicates that when the surface tension of the liquid is R L is greater than the critical surface tension of the substance R C, the surface of the liquid is not moist; when R L< R C, the liquid will moisten the surface of the substance. Therefore, the material with small critical surface tension as the release agent is the best release agent for isolation. |
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