PE保护膜留下残胶是什么原因呢？ 一.剥离强度经时改动 不管表面光泽度

What is the reason for the residual glue left on the PE protective film? <br>1. Peel strength changes over time <br>No matter how high the surface gloss is, there are many tiny holes on the surface of the object that are difficult to see with the naked eye. Despite the cross-linking, the pressure-sensitive adhesive still has certain deformation and fluidity, especially the polymer part that has not participated in the cross-linking. With the extension of time, the pressure sensitive adhesive gradually penetrated into the open space, forming an "anchor". In addition, when the PE protective film is attached, although the pressure is large, the contact area of ​​the pressure-sensitive adhesive and the data surface is not very large. With the extension of time, the contact area gradually increases. The force is gradually advancing. Both effects will increase the peel strength with time. <br> <br>2. Aging mechanism The <br>main chain of acrylic pressure-sensitive adhesive is a full chain. It is difficult for general thermal energy to break the main chain. The aging mechanism is mainly UV aging; the aging of the substrate is also mainly UV aging. For example, the tensile strength of the PE film substrate after aging for 1 week in an environment of 80 ℃ and UV lamp supplier 30W UV light, the results show that the usual application temperature has little effect on its aging performance, while the UV light The impact is greater. But under the action of heat and ultraviolet light, there is a synergistic aging effect. <br> <br>3. Similar Compatibility Mechanism <br>Acrylic pressure-sensitive adhesive is attributed to the more polar materials, which is simple and compatible with polar materials such as acrylics, polyesters, polyurethanes, etc., and it is difficult to remove the PE protective film. Sometimes small molecules that are not involved in cross-linking of pressure-sensitive adhesive will accumulate on the surface. If the force between the protected surface material and these small molecules is large, the phenomenon of small molecules moving residue will appear.

PE保护膜留下残胶是什么原因呢？<br> 一.剥离强度经时改动<br> 不管表面光泽度有多高,物体表面分布着许多肉眼难以看见的纤细小孔。压敏胶尽管通过交联,但仍具有必定的形变和流动性,尤其是未参加交联的聚合物部分。跟着时间的延伸,压敏胶逐渐渗透进空地中,构成“锚”。别的,贴附pe保护膜时,尽管压力较大,但压敏胶和资料表面的接触面积并不是很大,跟着时间的延伸,接触面积逐渐增大,pe保护膜和被保护表面之间作用力也逐渐前进。两种作用都会使剥离强度跟着时间的延伸而增大。<br> <br> 二.老化机理<br> 丙烯酸酯压敏胶主链是饱满链,一般的热能很难使主链断裂,老化机理主要是紫外光老化;基材老化也主要是紫外光老化。如PE薄膜基材在80 ℃环境中和uv灯管供货商30W紫外光下老化1周后的拉伸强度情况,结果表明,通常的运用温度对其老化性能影响不大,而紫外光的影响却较大。但是在热量和紫外光两层作用下,有协同老化作用。<br> <br> 三.相似相容机理<br> 丙烯酸酯压敏胶归于极性较大的材料,简单和丙烯酸酯类、聚酯类、聚氨酯类等极性材料相容,构成pe保护膜难以揭除。有时压敏胶未参与交联的小分子物质会向表面富集,假如被保护表面材料和这些小分子之间作用力较大的话,就会呈现小分子搬家残留的现象。

What is the reason for the residual glue left by PE protective film?<br>1、 Peel strength changed<br>No matter how glossy the surface is, there are many tiny holes on the surface of the object that are hard to see by the naked eye. Although the pressure-sensitive adhesive is crosslinked, it still has certain deformation and fluidity, especially for the polymer part which is not crosslinked. With the extension of time, the pressure-sensitive adhesive gradually penetrated into the open space, forming the "anchor". In addition, the contact area between pressure sensitive adhesive and data surface is not very large even though the pressure is large when attaching PE protective film. With the extension of time, the contact area increases gradually, and the force between PE protective film and protected surface also advances gradually. Both of them will increase the peel strength with time.<br>2、 Aging mechanism<br>The main chain of acrylate pressure-sensitive adhesive is full chain, and it is difficult to break the main chain due to general thermal energy. The aging mechanism is mainly UV aging, and the aging of substrate is also mainly UV aging. For example, the tensile strength of PE film substrate aged at 80 ℃ and 30W ultraviolet light of UV lamp supplier for one week shows that the normal operating temperature has little effect on its aging performance, but the influence of ultraviolet light is greater. But under the action of heat and ultraviolet light, there is synergistic aging effect.<br>3、 Similar compatibility mechanism<br>Acrylate pressure-sensitive adhesive is a kind of material with high polarity. It is easy to be compatible with polar materials such as acrylate, polyester, polyurethane and so on. Sometimes, the small molecules which are not involved in the crosslinking of PSA will accumulate to the surface. If the force between the protected surface material and these small molecules is large, the small molecules will move and remain.<br>