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涂布纸或纸板折叠时出现的裂痕是一种质量缺陷。纸或纸板折叠时,折叠处会产生压应力和张应力,但是目前还没有测定涂层抗压强度的方法。该文的目的是探求一种测定涂层抗压强度的方法,并研究不同矿物涂料的抗压性能。试验采用短距压缩强度测定(SCT)法测定独立涂层的内部抗压强度,结果表明测定涂层的内部抗压强度,SCT法是适用的。试验采用不同的颜料组分(高岭土和碳酸钙矿物颜料)用于研究颜料颗粒形状对涂料抗压强度和抗张强度的影响,所用胶乳具有不同的玻璃化温度。结果表明,颜料颗粒形状会影响涂层的强度;与球形或针状碳酸钙颜料相比,片状高岭土可以使涂层具有较好的强度;抗压强度和抗张强度会随着涂料中碳酸钙尤其是沉淀碳酸钙加入量的增加而降低。同时研究了丁苯黏结剂对涂层抗压强度的影响,结果表明涂层抗压强度随黏结剂用量的增加而增大,涂层抗压强度是抗张强度的3倍。
Cracks that occur when the coated paper or paperboard is folded are a quality defect. When paper or cardboard is folded, compressive and tensile stresses occur at the folds, but there is no method to determine the compressive strength of the coating. The purpose of this paper is to explore a method for determining the compressive strength of coatings and to study the compressive properties of different mineral coatings. The short compressive strength (SCT) method was used to determine the internal compressive strength of the individual coatings. The results show that the SCT method is suitable for the determination of the internal compressive strength of the coating. Different pigment components (kaolin and calcium carbonate mineral pigments) were used to study the effect of pigment particle shape on the compressive strength and tensile strength of the coatings. The latex used had different glass transition temperatures. The results show that the shape of the pigment particles will affect the strength of the coating. Compared with the spherical or acicular calcium carbonate pigments, the flake kaolin can make the coating have better strength. The compressive strength and tensile strength will be increased with the increase of the content of carbonic acid Calcium, especially precipitated calcium carbonate increases the amount of reduced. The effect of SBR on the compressive strength of the coating was also studied. The results show that the compressive strength of the coating increases with the increase of the amount of binder, the compressive strength of the coating is three times of the tensile strength.