Preparation and properties of polyacrylate latex pressure-sensitive adhesive with high peel strength

doi:10.16085/j.issn.1000-6613.2024-1904

Abstract

Abstract:

To improve the peel strength of emulsion-type polyacrylate pressure-sensitive adhesives (PSA), from the perspective of natural adhesion systems, polyacrylate emulsion PSA were prepared by semi-continuous emulsion polymerization using butyl acrylate (BA), 2-ethylhexyl acrylate (EHA), methyl methacrylate (MMA), acrylic acid (AA) and hydroxyethyl acrylate (HEA) as raw materials. Then, 3,4-dihydroxybenzaldehyde (DHBA), which had a structure similar to that of biological polyphenols, was used as a modified functional monomer for grafting and cross-linking modification to synthesize polyacrylate emulsion pressure-sensitive adhesives with high peel strength and no residual adhesive (HPSA). The effects of the amounts of DHBA, emulsifier, initiator and HEA on the bonding properties, viscosity and residual adhesive after peeling of HPSA were discussed in detail. The results showed that when the amount of DHBA was 4.0% (based on the total mass of soft and hard monomers, the same below), the amount of emulsifier was 1.4%, the amount of initiator was 0.5% and the amount of HEA was 3.0%, HPSA exhibited the best comprehensive performance. The 180° peel strength was 8.27N/25mm, the initial circular tack was 5.75N, the holding power was greater than 72h, and there was no residual adhesive on the mirror panel. Therefore, it had a good application prospect.

Key words: polyacrylate latex pressure-sensitive adhesive, 3,4-dihydroxybenzaldehyde, modification, bonding performance, high peel strength

摘要：

为改善乳液型聚丙烯酸酯压敏胶的剥离强度，从天然黏附系统角度，以丙烯酸丁酯（BA）、丙烯酸异辛酯（EHA）、甲基丙烯酸甲酯（MMA）、丙烯酸（AA）、丙烯酸羟乙酯（HEA）为原料通过半连续乳液聚合制备了聚丙烯酸酯乳液压敏胶（PSA），并利用具有类似生物多酚的结构3,4-二羟基苯甲醛（DHBA）为改性功能单体进行接枝交联改性，合成了具有高剥离强度无残胶的聚丙烯酸酯乳液压敏胶（HPSA），详细探讨了DHBA、乳化剂、引发剂及HEA用量对HPSA黏结性能、黏度及剥离后残胶的影响。结果表明：当DHBA用量为4.0%（以软硬单体总质量计，下同）、乳化剂用量1.4%、引发剂用量0.5%以及HEA用量3.0%时，HPSA的综合性能最佳，180°剥离强度为8.27N/25mm，环形初黏力为5.75N，持黏时间>72h，且镜面板上无残胶，因而具有良好的应用前景。

关键词: 聚丙烯酸酯乳液压敏胶, 3,4-二羟基苯甲醛, 改性, 黏结性能, 高剥离强度

CLC Number:

TQ433

JIANG Chunyuan, SHEN Hanlin, ZHANG Xinrui, TIAN Jinsheng, CHEN Qingqing, LI Yinwen. Preparation and properties of polyacrylate latex pressure-sensitive adhesive with high peel strength[J]. Chemical Industry and Engineering Progress, 2025, 44(12): 7075-7085.

蒋春源, 沈瀚林, 张欣蕊, 田锦盛, 陈青青, 李因文. 高剥离强度聚丙烯酸酯乳液压敏胶制备与性能[J]. 化工进展, 2025, 44(12): 7075-7085.

Figures/Tables 17

References 34

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样品	黏度/mPa·s	初黏力/N	持黏时间/h	剥离强度/N	DHBA/%
PSAs	145.7	2.21	≈8h	4.42	0
dPSA₁	144.2	3.41	≈10h	4.29	1.0
dPSA₂	116.4	3.34	≈48h	5.81	2.0
dPSA₃	117.5	4.16	>72h	8.78	3.0
dPSA₄	114.5	5.75	>72h	8.27	4.0
dPSA₅	102.3	3.53	>72h	6.46	5.0

样品	黏度/mPa·s	初黏力/N	持黏时间/h	剥离强度/N	DHBA/%
PSAs	145.7	2.21	≈8h	4.42	0
dPSA₁	144.2	3.41	≈10h	4.29	1.0
dPSA₂	116.4	3.34	≈48h	5.81	2.0
dPSA₃	117.5	4.16	>72h	8.78	3.0
dPSA₄	114.5	5.75	>72h	8.27	4.0
dPSA₅	102.3	3.53	>72h	6.46	5.0

样品	黏度/mPa·s	初黏力/N	持黏时间/h	剥离强度/N	APS/%
aPSA₁	86.3	1.32	≈8h	2.39	0.1
aPSA₂	100.2	2.45	≈10h	4.47	0.3
aPSA₃	121.7	3.47	>72h	7.25	0.5
aPSA₄	136.5	4.52	>72h	5.79	0.7
aPSA₅	153.4	3.13	≈10h	4.09	0.9

样品	黏度/mPa·s	初黏力/N	持黏时间/h	剥离强度/N	APS/%
aPSA₁	86.3	1.32	≈8h	2.39	0.1
aPSA₂	100.2	2.45	≈10h	4.47	0.3
aPSA₃	121.7	3.47	>72h	7.25	0.5
aPSA₄	136.5	4.52	>72h	5.79	0.7
aPSA₅	153.4	3.13	≈10h	4.09	0.9

样品	黏度/mPa·s	初黏力/N	持黏时间/h	剥离强度/N	CO436/%
cPSA₁	98.6	2.92	≈4h	3.60	1.0
cPSA₂	108.3	3.14	≈8h	5.31	1.2
cPSA₃	119.7	4.32	>72h	7.44	1.4
cPSA₄	145.3	5.41	>72h	6.46	1.6
cPSA₅	229.7	3.53	≈10h	5.22	1.8