CS251354B1 - Process for preparing an impregnating material for the production of a polishing film - Google Patents

Abstract

A method of preparing an impregnating material for the production of a polishing film by mixing a bifunctional polyol, such as a polyester polyol, a polyether polyol or a polyethylene glycol diisocyanate with a diisocyanate, such as 4,4-dimethylphenyl diisocyanate or 1,5-naphthyl diisocyanate, in a ratio of 1:0.6 to 1.2 at a temperature of 90-10°C in a nitrogen atmosphere for 0.5 to 2 hours and adding to the resulting prepolymer, containing 8.5 to 17% free -NCO groups at a temperature of 10 to 85°C low molecular weight glycols, di- or di-alcohols, such as 1,3-butadiole or 1,4-di-butadiole as a chain extender, using 0.02 to 0.2 % and other tertiary amines, for example diethylcyclohexane or triethylene, in combination with organotin compounds such as dibutyl cyanuric acid or octoate as a catalyst, in an amount of 0.01 to 0.9 vol. %, water as a blowing agent in an amount of 0.04 to 0.4 vol. % and diluents such as diethyl ketone or toluene, in an amount of 10 to 90 vol. %. The impregnation mixture prepared in this way is suitable for the production of porous, fibrous polishing foils, which are used for polishing and at the same time improve and compress, especially for materials for the electronics industry and ensure a highly clean and flawless surface.

Description

The present invention relates to a process for the preparation of a regenerating composition for the production of porous, fine fibrous leitl foil for surface treatment and leitane, in particular optical materials and semiconductors.

There are currently no known types of polishing pads and foils, based on nonwoven or woven lukewarm or synthetic substrates, optionally impregnated schools, waxes with phenolformeldehyde resins and asphalt, or impregnated with butyl ester and methyl methacrylene acid methyl ester. Impregnating materials on polyurethane substrates, possibly based on polyurethane elastomer, are also known.

By moving from the original pitch and wax mats to the previously mentioned polyurethane pans, the leitlcline process has significantly accelerated and made productive. However, the position of optical materials has reached a stage where it is necessary not only to make the process more precise and more precise, but especially to provide a very clean and basic surface for materials used in the electronics industry.

The present invention provides a process for the preparation of an impregnating composition for the production of a porous, fine fibrous polishing film according to the invention, comprising first and foremost a bifunctional polyol such as polyasterpolyol, polyetherpolyol or polyethylene glycol adipate and diisocyanate such as 4,4-matanediphanyldilso or 1,5-aaphthyl isocyanate, by weight, with 0.6 to 1.2 at temperatures of from 90 to 10 ° C under a nitrogen atmosphere for 0.5 to 2 h, and the thus prepared prepolymer containing 8.5 to 17 wt. % of the free -MCO groups and then mixed at temperatures of 10 ° C to 85 ° C with low-molecular-weight glycols, dienias or aminoalcohols, especially 1,3-butanedlol or 1,4-butanediolene as chain extender, in an amount of 0.02 to 0.2% by weight. . % with further tertiary amines, for example dinethylcyclohexanine or triethylamine, optionally in combination and organoaluminanamines such as dibutyl cllaurate or stannous octate as catalyst in an amount of 0.01 to 0.9 wt. and water as blowing agent in an amount of 0.04 to 0.4 wt. % and a diluent such as dimethyl ketone or toluene in an amount of 10 to 90 wt. %.

Other bifunctional polyols include polybutylene adipate, polyethylene butylene glycol adipate, polypropylene glycol, propoxylated trimatylol propane, but also polycaprolactone, polytetrahydrofuram and the like.

Among the diisocyanates, such toluamdiisocyanate or hexanethylene diisocyanate) can be used as the chain extender, for example, ethylene glycol, diethylene glycol, trlethylene glycol, 1,2-propylene glycol, 1,3-propylene glycol, 1,6-hexaadiol, ethylene-amine, diethyleneamino, hexamethylenedilamine, tetraamethylenedilamine, tetraamethylenediamine, , propanelamine and the like, such as dlfeaylnetaadianin.

Triathylandiamine N, N-diethylcyclehexylanine, triatanolamine, 1,4-dlnatylpiparazine can be used as catalyst. The polyurethane elastomer may also be modified by isocyanurate rings, which are formed by the side and polyurethane reactions of trimerization catalysts such as potassium hydroxide, potassium actam, 2,4,6-trisdinethylaninonethyl, phenol, or tetramethylanonium hydroxide.

The advantage of the impregnating compound prepared in this way is that the polishing foil produced by using it preserves excellent! properties of polyurethane elastomer, such as high resistance to abrasion by elasticity and divided properties are in rosmar stability at temperatures from -30 ° C to + 90 ° C and high strength and markedly improve surface quality of machined materials, especially required in electronics. Penetration hardness of polishers! foil ranges in bulk spread 25 to 80 Sh O.

Example 1

The impregnation mass was prepared by mixing 500 g of polyester polyol (hydroxyl plate)

25135 *

55.7 g KOH / g, acid number 0.05 g KOH / g, water content 0.02 wt. %, viscosity at 25 [deg.] C. (6 [mu] l) and 500 g of 4,4-aetaadiphenyldiocyanate at a temperature of 90 [deg.] C. in a reflux atmosphere for 30 ala.

A 14.7 haot prepolyaer, called -NCO clusters with a haotnoate of 1000 g, was added and mixed at a temperature of 40 ° C with 142 g 1,4-butaadiol, 0.35 g diaethylcyclohexaaia, 1 g water and 1450 g acetone.

Thus prepared haota was iapregnated aatkaaá fibrous layer and polyester in poair textile fabric and iapragation haota 1: 1,5. Silage and lava foil with a density of 440 kg / s and a penetration hardness of 26 Sh O, providing surface treatment during the processing of optical materials.

Example 2

The impregnation mass was prepared with 1000 g of polyetherpolyol (hydroxyl value 55.5 g KOH / g, water content 0.01 haot%, molecular weight 2,000 g / aol) and 700 g of 4,4-netandiphenyldiisocyanate at 85 ° C after over 1 hour in a nitrogen ataosphere and to said 1,700 g prepolymer containing 11.4 wt.% -NCO groups were added 190 g 1,4butanediol, 0.35 g triaethylaine and dibutyltin dilaurate catalyst in a weight ratio of 10: 1, 2, 1 g of water and 1 550 g of toluene.

The nonwoven fibrous layer was impregnated at this temperature at 40 ° C. The obtained polishing foil aila density 531.6 kg / a ^ and a penetration hardness of 34 Sh D.

Example 3

The impregnating haota was prepared by mixing and 500 g of polyethylene glycol adipate (acid number 0.7 g KOH / g, hydroxyl number 56 g KOH / g, molecular haotaoat 2000 g / aol, water content below 0.02 haot%) and 500 g 4, Of 4-metaaphenyldisocyanate at 90 ° C for 2 h under a nitrogen atmosphere.

Κ 1000 g of this prepolyer containing 14,7 haot. % of free -NCO-acium was added at 30 ° C 19 g 1,4-butaadial, 0.4 g Ν, dia-diaethylcyclohexaain, 0.1 g stannous octonate, 0.3 g potassium acetate and 800 g acetone.

This haot was impregnated with a flocking cloth and an inlaid polishing foil and a 704 fcg / n ^ bulk haotaoat and a hardness of 76 Sh 'D.

Claims (1)

SUBJECT OF THE INVENTION A process for the preparation of an opaque composition for the production of a polishing foil and a textile material, characterized in that it is first mixed with a polyfunctional polyol, such as a polyester polyol, polyetherpolyol or polyethylene glycol adipate, with a diisocyanate such as 4,4-aetaadiphenyl diisocyanate or 1: 0.6 to 1.2 at temperatures * 90 and 10 ° C in a nitrogen atmosphere for 0.5 to 2 h and the resulting prepolymer containing 8.5 to 17 wt. % of the free NCO groups are then mixed at a temperature of 10 to 85 ° C with low molecular weight glycols, diamines or aminoalcohols, in particular 1,3-butanediol or 1,4-butaadiolea as chain extenders, in an amount of 0.02 to 0.2 haot. and further with tertiary amines, for example dimethylcyclohexamine or triethylamine, optionally in combination with an organoaluminum compound of tin, such as dibutylclalaurate or triacetate as a catalyst, in an amount of 0.01 to 0.9 wt. % and water as blowing agent in an amount of 0.04 to 0.4 haot. % and a diluent such as diaethylketone or toluene in an amount of 10 to 90 haot. %