薛俊，王训彦，吴晶,等. 磷石膏基无水硫酸钙作为PVC填料的应用研究[J].河南理工大学学报(自然科学版)，doi:10.16186/j.cnki.1673-9787.（ 2024030070）..

XUE J, WANG X Y, WU J, et al． Application research of phosphogypsum based anhydrous calcium sulfate as PVC filler [J]. Journal of Henan Polytechnic University( Natural Science) ， doi: 10.16186/j.cnki.1673-9787.（ 2024030070）..

磷石膏基无水硫酸钙作为PVC填料的应用研究(网络首发)

薛俊1，王训彦1，吴晶2，林志高3，刘仿军1，李蕾1，马会娟4，江吉周1

1.武汉工程大学 材料科学与工程学院，环境生态与生物工程学院，新型催化材料湖北省工程研究中心，磷资源开发利用教育部工程研究中心，湖北 武汉 430205；2.湖北省地质实验测试中心 自然资源部稀土稀有稀散矿产重点实验室，湖北 武汉 430034；3.湖北金牛管业有限公司，湖北 武汉 430050；4.湖北三峡实验室，湖北 宜昌 443000

摘要: 目的 为解决以磷石膏为首的“三磷”问题，实现固废的资源化利用，研究磷石膏基无水硫酸钙(P-AH)作为PVC树脂填料的可行性。 方法 以重质碳酸钙(HCC)为比较对象，按照相同配方下，制成PVC复合材料，通过对复合材料冲击强度、弯曲强度、弯曲模量、导热性能和热失重的对比，并对样条的冲击断裂面进行SEM测试，探究了P-AH作为填料的可行性，并在此基础上通过生产性试验进行实际生产。结果 对于PVC/P-AH复材，随着掺量的增加，冲击强度变化不大，弯曲强度和弯曲模量呈复合指数增长，导热系数呈线性增长，在填料分数为35%时，冲击强度为9.9 MPa，弯曲强度为64.5 MPa，弯曲模量为3878 MPa，导热系数为0.252 W(m·K)^-1，在高掺量下，除了弯曲模量，PVC/HCC复材的性能均弱于PVC/P-AH复材；通过对断面的SEM测试发现PVC/HCC 复材出现粉体团聚现象，这是导致其强度较低的直接原因，而通过DSC-TG的测试分析发现在PVC分解时，PVC/P-AH复材需要吸收157.13 J/g的能量，PVC/HCC复材需要吸收138.95 J/g的能量，前者更不容易分解。通过将P-AH用于PVC管材实际生产，得到了合格产品，并且除颜色外，其他性能指标略优于传统重钙填料。结论 P-AH可直接用作PVC树脂填料，从而为磷石膏应用拓展了一条新的高值化途径。

关键词:磷石膏；Ⅱ型无水硫酸钙；填料；PVC树脂

doi: 10.16186/j.cnki.1673-9787. （ 2024030070）..

基金项目: 国家重点研发计划项目（2022YFC3902703）； 磷资源开发利用教育部工程研究中心创新基金项目（LCX202303）；湖北三峡实验室创新基金（SC213012）

收稿日期：2024-03-26

修回日期：2024-05-06

网络首发日期：2026-06-04

Application research of phosphogypsum based anhydrous calcium sulfate as PVC filler (Online)

Xue Jun1, Wang Xunyan1, Wu Jing2, Lin Zhigao3, Liu Fangjun1, Li Lei1, Ma Huijuan 4, Jiang Jizhou1

1.School of Materials Science and Engineering, School of Environmental Ecology and Biological Engineering, Novel Catalytic Materials of Hubei Engineering Research Center, Engineering Research Center of Phosphorus Resources Development and Utilization of Ministry of Education, Wuhan 430205, Hubei, China; 2.Key Laboratory of Rare Mineral, Ministry of Natural Resources, Geological Experimental Testing Center of Hubei Province, Wuhan, 430034, Hubei, China; 3. Hubei Jinniu Pipe Industry Co., Ltd, Wuhan, 430050, Hubei, China；4.Hubei Three Gorges Laboratory, Yichang, 443000, Hubei, China

Abstract: Objectives To study the feasibility of using phosphogypsum based anhydrous calcium sulfate (P-AH) as a PVC resin filler, in order to solve the "three phosphorus" problem led by phosphogypsum and achieve the resource utilization of solid waste. Methods Using heavy calcium carbonate (HCC) as the comparative object, PVC composite materials were made according to the same formula. By comparing the impact strength, bending strength, bending modulus, thermal conductivity, and thermal weight loss of the composite materials, and conducting SEM tests on the impact fracture surface of the samples, the feasibility of using P-AH as a filler was explored. On this basis, actual production will be carried out through productive experiments. Results For PVC/P-AH composites, with the increase of dosage, the impact strength does not change much, the flexural strength and flexural modulus increase exponentially, while the thermal conductivity increases linearly. When the filler fraction is 35 parts, the impact strength is 9.9 MPa, the flexural strength is 64.5 MPa, the flexural modulus is 3878 MPa, and the thermal conductivity is 0.252 W(m·K)-1. At high dosage, except for the flexural modulus, the performance of PVC/HCC composites is weaker than that of PVC/P-AH composites; Through SEM testing of the cross-section, it was found that PVC/HCC composites exhibit powder agglomeration, which is the direct reason for their lower strength. However, through DSC-TG testing analysis, it was found that during PVC decomposition, PVC/P-AH composites need to absorb 157.13 J/g of energy, while PVC/HCC composites need to absorb 138.95 J/g of energy. The former is less prone to decomposition. By using P-AH in the actual production of PVC pipes, qualified products were obtained, and except for color, other performance indicators were slightly better than traditional heavy calcium fillers. Conclusions P-AH can be directly used as PVC resin filler, thus expanding a new high-value path for the application of phosphogypsum.

Key words: Phosphogypsum; Anhydrous calcium sulfate; Filler; PVC resin