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挤塑板与聚合物砂浆的粘结受哪些因素影响?
作者:admin 来源:本站 发布时间:2019-05-09 11:35:25 浏览次数:76
湿度应力——热胀冷着
Humidity Stress-Thermal Expansion and Cooling
挤塑板(外表)密度大、强度高,挤塑板由于本身变形及温差变形而产生的变形应力大。点框粘挤塑板薄抹灰系统由于聚合物抹面砂浆与挤塑板导热系数相差31倍。抹面砂浆与挤塑板线胀系数差别较大、在夏季外墙表面面温度变化较大,在较长时间的曝晒后忽然降下阵雨,产生热应力,引发了相邻资料变形速率差不分歧,资料热胀冷缩,长期处于一种不稳定的热胀冷缩运动状态,使聚合物砂浆与挤塑板之间产生剪力,影响它们之间的粘结强度。开裂和空鼓都是面层粘结强度不能抵御湿度应力。
The extruded sheet (exterior) has high density and strength, and the deion stress of the extruded sheet is large due to its own deion and temperature difference deion. The thermal conductivity of the thin plastering system for point frame viscous extruded sheet is 31 times higher than that of the extruded sheet because of the difference between the polymer plastering mortar and the plastering system. The linear expansion coefficients of plastered mortar and Extrusion board are quite different, and the temperature of exterior wall surface varies greatly in summer. After a long period of exposure to the sun, a shower suddenly falls, resulting in thermal stress, which leads to the difference of deion rates between adjacent data. The thermal expansion and cold contraction of data are in an unstable state of thermal expansion and cold contraction for a long time, which causes shear force between polymer mortar and Extrusion board and affects it. Bond strength between them. Cracking and empty drum are both surface bond strength can not withstand humidity stress.
挤塑板泡沫性能——挤塑板外表粗糙水平影响机械啮合力
Foam properties of extruded plates -- rough surface of extruded sheet affects mechanical meshing force
点框粘挤塑板由于挤塑板薄抹灰系统透气性差,外表润滑、低吸水、其分子链端没有一基团,属于疏水基,很难与无机水泥基资料交融,在用粘结砂浆、抹面砂浆粘贴时,极易形成假粘和脱粘。对挤塑板外表停止去皮拉毛处置,进步基材外表的粗糙水平,增加了他们接触面的摩擦系数、粘结力主要表现为机械啮合力。
Point-frame viscous Extrusion board is hydrophobic because of its poor air permeability, external lubrication, low water absorption and no group at its molecular chain end. It is difficult to blend with inorganic cement-based materials. When bonding mortar and plastering mortar, it is easy to form false bonding and debonding. The surface of extruded sheets should be treated without peeling and furring, and the roughness of the surface of the base materials should be improved. The friction coefficient and cohesive force of the contact surface of the extruded sheets should be increased mainly as mechanical meshing force.
水——分子作用力的有效间距影响着物理吸收力
Effective spacing of water-molecule interaction forces affects physical absorption
(1) 吸水膨胀

(1) Water absorption and expansion

在连绵不断的梅雨季节。聚合物膜吸收的雨水比释放出来的潮气还多,雨水也会经细微的裂纹或破损处进入到建筑材料内部。而在水分、太阳光的紫外线、空气中的氧气和能量的共同作用下,发生氧化反应和水解反应,导致涂膜有机聚合物降解,涂膜吸水膨胀,千燥收缩,会产生应力。通过微观分析发现聚合物膜吸湿膨胀,被水肿胀之后聚合物膜开始软化,降低了聚合物膜桥接的作用,最终聚合物膜由于降解失去粘结力,从而产生粉化、附着力丧失等致命性损坏。
In the continuous rainy season. Polymer membranes absorb more rainwater than the released moisture, and rainwater also enters the interior of building materials through minor cracks or breakages. Under the combined action of water, ultraviolet ray of sunlight, oxygen and energy in air, oxidation and hydrolysis occur, which leads to the degradation of organic polymer coatings, water absorption and expansion of coatings, drying shrinkage and stress. Microscopic analysis showed that polymer membranes swelled and began to soften after being swollen, which reduced the bridging effect of polymer membranes. Eventually, polymer membranes lost adhesion due to degradation, resulting in fatal damage such as pulverization and adhesion loss.
(2) 水气蒸发后引发干燥收缩
(2) Drying shrinkage caused by evaporation of water vapor
聚合物砂浆长期处在潮湿环境中、会引起膨胀或收缩。湿度变形与水泥砂浆的含水量变化和干缩率有关。由湿度引起的变形中,膨胀值是其收缩值的1/4,当收缩应力大于砂浆的抗拉强度时,砂浆必然产生裂缝,并随着时间推移破坏范国也逐渐在扩展。
Polymer mortar in wet environment for a long time will cause expansion or contraction. Humidity deion is related to the change of water content and shrinkage of cement mortar. In the deion caused by humidity, the expansion value is 1/4 of its shrinkage value. When the shrinkage stress is greater than the tensile strength of the mortar, the mortar will inevitably produce cracks, and with the passage of time, the damage Fanguo is gradually expanding.
(3) 固态水的冻胀
(3) Frost heave of solid water
冬季结冰。由于冰比水的体积约增加9%,从而产生冻胀应力,造成了对聚合物砂浆粘结层破坏,引发聚合物砂浆脱落。
It freezes in winter. As the volume of ice increases by about 9% compared with water, the frost heave stress occurs, which results in the destruction of the bonding layer of polymer mortar and the shedding of polymer mortar.
材料自身老化和化学侵蚀一影响化学键合作用力
Material self-ageing and chemical erosion affect chemical bonding force
由于水泥水化反应生成了水凝胶)和游离氧化钙等物质,水溶液在迁移和蒸发过程中,结晶出,给聚合物砂浆中提供了碱环境,加之XPS板本身透气性差,不能将水蒸气有效的迁移出去,许多聚合物乳胶粉长期处在碱环境下,很容易易被皂化,从而引起粘结性能下降,同时也降低了玻纤网格布的抗拉强度因此,在聚合物砂浆中的乳胶粉耐碱是一个很重要的因素。
Because of the ion of hydrogel and free calcium oxide in cement hydration reaction, the water solution crystallizes during the process of migration and evaporation, which provides alkali environment for polymer mortar. In addition, the poor permeability of XPS board itself prevents the effective migration of water vapor. Many polymer latex powders are easily saponified in alkali environment for a long time, which leads to the decrease of bonding properties. At the same time, it also reduces the tensile strength of glass fiber mesh cloth. Therefore, alkali resistance of latex powder in polymer mortar is an important factor.
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