包装论文：耐水增强剂对无硼无载体淀粉胶性能影响的研究

摘  要

介绍了无硼无载体淀粉胶粘剂的的制备原理和工艺，着重论述了耐水剂和增强剂对无硼无载体淀粉胶粘剂的粘度、初粘度、粘结强度、边压强度及耐水性能的影响。添加不同量的增强剂P、R和H及耐水剂PVA和脲醛胶粘剂分别对无硼无载体淀粉胶粘剂进行条件实验。确定了复合增强剂的配比为P:R:H=3:1:3，复合耐水剂PVA与脲醛胶粘剂，其比值为PVA：脲醛胶粘剂=1:8。试验表明，用7﹪（按淀粉重量百分比，以下均同）的复合增强剂，9﹪的复合耐水剂制备的无载体淀粉胶粘剂的粘度为36.7s（国家标准为30～50s），初粘度（即破纸率）为98.6%。用该胶粘剂粘制的瓦楞纸板的粘结强度为1922N/m，边压强度为3723N/m，都超过了东莞海富包装有限公司生产的同纸质瓦楞纸板的粘结强度（1800N/m）和边压强度(3500N/m)，耐水性能为71h 。该淀粉胶粘剂不分层、不凝胶、不沉淀，循环使用不变稀，并且用磷酸钠取代了长期使用的有毒胶粘剂硼砂，是环保型淀粉胶粘剂，可推广使用。

关键词：淀粉胶粘剂，粘度，增强剂，耐水剂，耐水性能

ABSTRACT

This paper describes the preparation mechanism and technique for the preparation of boron-free and support-free starch adhesive. Our research focuses on the impact of reinforcing agent and water resistant agent on the viscosity, early viscosity, water resistance, bond strength and compressive strength of boron free and support-free starch adhesive. The condition experiments were carried out using different amount of reinforcing agents P, R, and H and water resistant agents PVA and UF to study their effects on the boron free starch adhesive. After analyzing the results, the best ratio of P: R: H in the composite reinforcing agent is3:1:3. The best ratio between PVA and UF in the composite water resistant agent is 1: 8, and the actual amount used is 7% (weight percent of starch). The viscosity of as-prepared starch adhesive with the optimized experimental conditions is 36.7 seconds. Its initially stick force (broken paper rate) 98.6%. The corrugated cardboards made with this adhesive have bond strength of 1922N/m, compressive strength of 3723N/m. The corrugated boards made by the HaiFu Paper Packaging Ltd have adhesive bond strength of 1800N/m and compressive strength of 3500N/m. Thus, the corrugated boards have better quality than those produced by HaiFu Paper Packaging Ltd. Their water resistant performance has achieved 71 hours. All test results indicated that the performance of the corrugated boards made with our adhesive has surpassed the national standard. This adhesive has stable performance. The corrugated board made with this adhesive dries very quickly, has good water resistant performance, and is very suitable for industrial production of adhesive.

Keywords: Starch adhesive, Viscosity, Intensifier, Water proofing agent,
Water resistant performance

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