RO116632B1

RO116632B1 - Adhesive composition

Info

Publication number: RO116632B1
Application number: RO99-00685A
Authority: RO
Inventors: Marinică Potop; Aurel Potop
Original assignee: S.C. Sarcom S.R.L.
Priority date: 1999-06-17
Filing date: 1999-06-17
Publication date: 2001-04-30

Abstract

The invention relates to an adhesive composition which can be used in the wood and polygraphic industries. According to the invention, the adhesive composition has a pH = 5...7 and comprises 70...87% aqueous dispersion of polyvinylacetate, 7...15% calcium carbonate, barium hydroxide and/or micronized pulverized marble and 6...15% demineralized water, 3...5% dibutylphthalate, 1...2% butyl acetate, 0.3...1% hydroxyethylcellulose, 0.05...0. 1% isothiazolinone mixture, 0.05... 0.1% non-ionic mineral oil, with a maximum viscosity of 1000 cP at the temperature of 20 °C, in emulsion, the percents being expressed by weight. The weight percent of calcium carbonate : barium hydroxide : pulverized marble, if used in admixture, is 70...50 : 20...25 :20...25.

Description

RO 116632 BRO 116632 B

Invenția se referă la o compoziție adezivă, care poate fi folosită în industria lemnului și în industria poligrafică.The invention relates to an adhesive composition, which can be used in the wood industry and in the printing industry.

Sunt cunoscute compoziții adezive (RO 107268), care conțin 94% dispersie apoasă de poliacetat de vinii, 3% plastifiant ales din clasa diesterului acidului ftalic și 3% amestec de solvenți organici, constituit din acetat de metil, acetat de vinii și uleiuri butanolice într-un raport gravimetric de 1:1:1 cu o viscozitate de 6223 cP.Adhesive compositions (RO 107268) are known, which contain 94% aqueous dispersion of polyvinyl acetate, 3% plasticizer chosen from the phthalic acid diester class and 3% mixture of organic solvents, consisting of methyl acetate, vinyl acetate and butanol oils in -a gravimetric ratio of 1:1:1 with a viscosity of 6223 cP.

Dezavantajele acestei compoziții constau în aceea că are o viscozitate relativ redusă și, în condiții de variații bruște de temperatură și umiditate, scade, în timp, rezistența la rupere a încleierii.The disadvantages of this composition are that it has a relatively low viscosity and, under conditions of sudden changes in temperature and humidity, the breaking strength of the glue decreases over time.

Problema tehnică, pe care o rezolvă invenția, constă în asigurarea unei structuri finale care, datorită prezenței în compoziție a unor particule solide, a unui antisupumant, a unui dispersant și a unui conservant rezistent, în timp, permite menținerea caracteristicilor inițiale de aderare la suport.The technical problem, which the invention solves, consists in ensuring a final structure which, due to the presence in the composition of some solid particles, an anti-foaming agent, a dispersant and a resistant preservative, over time, allows maintaining the initial characteristics of adhesion to the support .

Compoziția adezivă, conform invenției, înlătură dezavantajele arătate mai sus, prin aceea că are un pH de 5...7 și este constituită din 70...87% poliacetat de vinii dispersie apoasă, 7...5% carbonat de calciu, barită și/sau praf de marmură micronizat, 6...15% apă demineralizată, 3...5% dibutilftalat, 1...2% acetat de butii, 0,3,..1% hidroxietilceluloză, 0,05...0,1% izotiazolinon mixtură, 0,05...0,1% ulei mineral neionic, cu o viscozitate de maximum 1000 cP, la temperatura de 20°C, în emulsie, procentele fiind exprimate în greutate. Raportul în greutate carbonat de calciu:barită:praf de marmură micronizat, în cazul în care se folosesc în amestec, este 70...50:20.,. 25:10...25.The adhesive composition, according to the invention, removes the disadvantages shown above, in that it has a pH of 5...7 and consists of 70...87% polyvinyl acetate aqueous dispersion, 7...5% calcium carbonate, barite and/or micronized marble dust, 6...15% demineralized water, 3...5% dibutyl phthalate, 1...2% butyl acetate, 0.3,..1% hydroxyethyl cellulose, 0.05. ..0.1% isothiazolinone mixture, 0.05...0.1% non-ionic mineral oil, with a maximum viscosity of 1000 cP, at a temperature of 20°C, in emulsion, the percentages being expressed by weight. The weight ratio of calcium carbonate: barite: micronized marble dust, if they are used in a mixture, is 70...50:20.,. 25:10...25.

Compoziția conform invenției prezintă următoarele avantaje:The composition according to the invention has the following advantages:

- asigură o bună adezivitate față de suporturi de natură diferită, cu o rezistență bună, în timp îndelungat;- ensures good adhesion to supports of different nature, with good resistance, over a long period of time;

- are un timp relativ redus pentru uscare;- it has a relatively short drying time;

- își păstrează caracteristicile și după un timp relativ mare de conservare în stare îmbuteliată.- it retains its characteristics even after a relatively long time of conservation in the bottled state.

Compoziția conform invenției se obține într-un vas de reacție, prevăzut cu termostat și agitator. Sub agitare continuă, se dozează 70...87% poliacetat de vinii sub formă de dispersie apoasă cu 46...50% conținut de solide de o viscozitate Hoppler de minimum 30D0 cP, după care sub agitare continuă, la temperatura de 15...20°C, se dozează 0,05...0,1% ulei mineral neionic, cu o viscozitate de maximum 1000 cP, la temperatura de 20°C, în emulsie cu rol de antispumant și 7...15% carbonat de calciu, barită și/sau praf de marmură micronizat. în continuare, în aceleași condiții, se introduce în curgere continuă având debit cu valoare relativ redusă și constantă în timp, 1 ...2% acetat de butii și 3...5% dibutilftalat, procentele fiind exprimate în greutate.The composition according to the invention is obtained in a reaction vessel, equipped with a thermostat and a stirrer. Under continuous stirring, dose 70...87% polyvinyl acetate in the form of an aqueous dispersion with 46...50% solids content with a Hoppler viscosity of at least 30D0 cP, then under continuous stirring, at a temperature of 15. ..20°C, dose 0.05...0.1% non-ionic mineral oil, with a maximum viscosity of 1000 cP, at a temperature of 20°C, in emulsion with the role of antifoam and 7...15% calcium carbonate, barite and/or micronized marble dust. then, under the same conditions, 1 ... 2% butyl acetate and 3 ... 5% dibutyl phthalate are introduced in a continuous flow with a flow with a relatively low value and constant over time, the percentages being expressed by weight.

După 10 min, se adaugă 6...15% apă demineralizată și 0,3...1% hidroxietilceluloză cu rol de creștere a viscozității până la o valoare de minimum 8000 cP, după care, tot sub agitare continuă, se introduce 0,05.,.0,1% izotiazolinon cu rol de conservant.After 10 min, add 6...15% demineralized water and 0.3...1% hydroxyethylcellulose with the role of increasing the viscosity to a value of at least 8000 cP, after which, also under continuous stirring, introduce 0 ,05.,.0.1% isothiazolinone as a preservative.

în final, la o temperatură de 2O...25°C, se corectează pH-ul până la valoarea de 5...7. cu o soluție apoasă de amoniac cu o concentrație de 25...35% amoniac.finally, at a temperature of 2O...25°C, the pH is corrected to a value of 5...7. with an aqueous ammonia solution with a concentration of 25...35% ammonia.

Culoarea adezivului astfel obținut este albă, viscozitatea este de 8000...10000 cP, timpul de uscare este de 15 min, iar rezistența la rupere prin forfecare este de 95 DaN/cmThe color of the adhesive thus obtained is white, the viscosity is 8000...10000 cP, the drying time is 15 min, and the resistance to shearing is 95 DaN/cm

Claims

RO 116632 B

Here are two examples of the adhesive composition according to the invention:

Example 1. in a reaction vessel, equipped with a thermostat and a stirrer, under continuous stirring, dose 80 kg of polyvinyl acetate dispersion in water with 46...50% solid 50 content, a Hoppler viscosity of at least 3000 cP, after which, under continuous stirring at a temperature of 15...20°C, dose 0.1 kg of non-ionic mineral oil, with a maximum viscosity of 1000 cP, at a temperature of 20°C, in emulsion with the role of antifoam and 7 kg of carbonate of calcium, barite and/or micronized marble dust. then, under the same conditions, 1 kg of butyl acetate and 4 kg of dibutyl phthalate are introduced in a continuous flow, with a flow rate of relatively low value and constant over time. After 10 min, add 7.15 L of demineralized water and 0.7 kg of hydroxyethyl cellulose with the role of increasing the viscosity to a minimum value of 8000 cP, after which, also under continuous stirring, introduce 0.05 kg of isothiazolinone with the role preservative. finally, at a temperature of 2O...25°C, the pH is corrected to a value of 7 with an aqueous solution of ammonia 60 having a concentration of 25.. .35% by weight of ammonia.

The color of the composition is white, the viscosity is 10000 cP, the drying time is 15 min, and the shear strength is 95 DaN/cm ^e (adhesive class A^^g).

Example 2. in a reaction vessel, equipped with a stirrer and thermostat, under continuous stirring 65, 70 kg of polyvinyl acetate aqueous dispersion, 0.05 kg of mineral oil, non-ionic, with a maximum viscosity of 1000 cP at a temperature of 20°C, in emulsion with the role of antifoam, 12 kg of calcium carbonate, barite and/or micronized marble dust. then, under the same conditions, 1 kg of butyl acetate and 3 kg of dibutyl phthalate are introduced in a continuous flow with a flow rate with a relatively low value and constant over time. After 10 min 70 of stirring, add 0.4 kg of hydroxyethyl cellulose with the role of increasing viscosity and 13.45 L of demineralized water, after which 0.1 kg of isothiazolinone mixture with the role of preservative is introduced.

Finally, at a temperature of 2O...25°C, the pH is corrected to a value of 7 with an aqueous ammonia solution 25...35% by weight of ammonia. 75

Thus, the obtained composition (the adhesive class A ₁₀ . _ig ] has a white color, a viscosity of 9000 cP, a drying time of 16 min, and a resistance to breaking by shearing of 90 DaN/cm ² ,

80 Claims

1. Adhesive composition, in the form of an aqueous dispersion, based on polyvinyl acetate, characterized by the fact that it has a pH of 5...7 and is made up of 70...87% polyvinyl acetate, aqueous dispersion, 7. ..15% calcium carbonate, barite and/or micronized 85 marble dust, 6... 15% demineralized water, 3...5% dibutyl phthalate, 1..,2% butyl acetate, 0.3.. .1% hydroxyethylcellulose, 0.05...0.1% isothiazolinone mixture and 0.05...0.1% non-ionic peppermint oil, with a maximum viscosity of 1000 cP, at a temperature of 20°C in emulsion, the percentages being expressed in weight.

2. Composition according to claim 1, characterized in that the ratio in 90 weight of calcium carbonate: barite: micronized marble dust if they are used in a mixture, is 70...50:20...25:10. ..25.

RO 116632 B

3. Composition according to claims 1, characterized in that it has a pH of 7 and consists of 80% vinyl acetate aqueous dispersion, 7% calcium carbonate 95, barite and/or micronized marble dust, 7.15% demineralized water .

4. Composition according to claims 1 and 2, characterized in that it has a pH of 7 and consists of 70% polyvinyl acetate aqueous dispersion, 0.05 nonionic mineral oil, with a maximum viscosity of 1000 cP at a temperature of 20° C in emulsion, 12% calcium carbonate, barite and/or micronized marble dust, 1% butyl acetate, 3% dibutyl phthalate, 0.4% hydroxyethylcellulose, 13.45% demineralized water, and 0.1% isothiazolinone blend.

President of the examination committee: Eng. Fierea Stela

Examiner: chem. Nicholas Anastasia

Editing and computerized techno-editing - OSIM

Printed at: State Office for Inventions and Trademarks