Utjecaj adheziva na svojstva papira

undergraduate thesis

• Title (english): The influence of adhesives on paper properties
• Author: Iva Šadura
• Mentor: Mirela Leskovac (mentor)
• Mentor: Zrinka Buhin Šturlić (komentor)
• Committee member: Mirela Leskovac (predsjednik povjerenstva)
• Committee member: Zrinka Buhin Šturlić (član povjerenstva)
• Committee member: Iva Movre Šapić (član povjerenstva)
• Granter: University of Zagreb; Faculty of Chemical Engineering and Technology; Zagreb
• Defense date and country: 2020-09-24, Croatia
• Scientific / art field, discipline and subdiscipline: TECHNICAL SCIENCES; Chemical Engineering

Abstract

U procesu proizvodnje papira adhezivi su neizostavna pomoćna sredstva koja se dodaju u papirnu suspenziju ili se površinski nanose u obliku premaza. S obzirom na namjenu papirnih proizvoda njihova svojstva variraju te se premazivanje papira adhezivima vrši u svrhu poboljšanja željenih svojstava. U papirnoj industriji često se upotrebljavaju bioadhezivi dobiveni iz biljnih ili životinjskih izvora zbog ekološke prihvatljivosti i dostupnosti. U ovom radu korišteni su bioadhezivi: klucel (hidroksipropil celuloza), metil celuloza, rižin škrob i šelak. Toplinska svojstva bioadheziva ispitana su tehnikom diferencijalne pretražne kalorimetrije (DSC) i termogravimetrijskom analizom (TGA). Mehanička svojstva filter papira premazanih otopinama adheziva karakterizirana su vlačnim ispitivanjem na mehaničkoj kidalici, a površinska svojstva filter papira s premazom prirodnog adheziva mjerenjem kontaktnog kuta s testnom kapljevinom vodom. Termogravimetrijskom analizom utvrđeno je da se toplinska razgradnja klucela odvija u jednom stupnju, dok se metil celuloza, rižin škrob i šelak razgrađuju u dva stupnja. Iz rezultata analize diferencijalne pretražne kalorimetrije zaključeno je da su svi ispitivani prirodni adhezivi amorfne strukture. Postoje značajne razlike 1. i 2. ciklusa zagrijavanja, u ciklusu zagrijavanja metil celuloza i šelaka dolazi do staklastih prijelaza, a klucel, metil celuloza i rižin škrob pokazuju endotermne prijelaze u širokom temperaturnom području. Na temelju rezultata zaključeno je kako premazivanje filter papira bioadhezivima utječe na promjenu mehaničkih i površinskih svojstava. Upojnost vode filter papira se smanjuje premazom otopinama klucela, metil celuloze, rižinog škroba i šelaka.

Abstract (english)

In the process of paper production, adhesives are indispensable auxiliaries that are added to the paper suspension or applied to the surface in the form of a coating. Given the purpose of paper products, their properties vary and therefore the coating of the paper with adhesives is applied with the aim to improve the desired properties. Bioadhesives obtained from plants ar animal sources are often used in the paper industry due to their environmental friendliness and availability. Bioadhesives that were used in this research are: klucel (hydroxypropyl cellulose), methyl cellulose, rice starch and shellac. The thermal properties of bioadhesives were examined by differential scanning calorimetry (DSC) and thermogravimetric analysis (TGA). The mechanical properties of adhesive coated paper were characterized by tensile testing on a mechanical testing machine, and the surface properties by measuring the contact angle with water as a test liquid. Thermogravimetric analysis showed that the thermal decomposition of klucel takes place in one stage, while methyl cellulose, rice starch and shellac are decomposed in two stages. From the results of differential scanning calorimetry, it was concluded all adhesives are amorphous. Significant differences in the 1. and 2. heating cycles are visible, methyl cellulose and shellac showe glass transition, klucel, methyl cellulose and rice starch show endothermic transitions in a wide temperature range. Based on the results, it was concluded that coating of bioadhesives on the filter paper changed its mechanical and surface properties. The water absorbency of the filter paper is reduced by coating the paper with klucel, methyl cellulose, rice starch and shellac.

• Keywords: papir; svojstva papira; adhezija; bioadhezivi
• Keywords (english): paper; paper properties; adhesion; bioadhesives
• Language: croatian
• URN:NBN: urn:nbn:hr:149:502035
• Study programme: Title: Materials Science and Engineering - Undergraduate study; Study programme type: university; Study level: undergraduate; Academic / professional title: sveučilišni/a prvostupnik/ prvostupnica (baccalaureus/baccalaurea) inženjer/inženjerka kemijskog inženjerstva (sveučilišni/a prvostupnik/ prvostupnica (baccalaureus/baccalaurea) inženjer/inženjerka kemijskog inženjerstva)
• Type of resource: Text
• File origin: Born digital
• Access conditions: Access restricted to students and staff of home institution
• Created on: 2023-05-08 16:05:42