SU469269A3 - The method of obtaining non-woven material - Google Patents

Description

propylene urea, acetylndiourea or 4,5-dioximidazolidon-2 and its derivatives, for example, substituted at the 4-position of the hydroxyl group with the residue CH2CH2CO 4,5-dioximidazolidon-2. Methylene compounds of urea and melamine are preferably used. Especially valuable products give highly methylated products. Both monomolecular and precondensed solids are suitable as starting materials. Aminoplast precondensates used as starting materials for the preparation of reactive surfactants can also be used as ethers of alkanols with 1–3 carbon atoms, especially in the form of methyl ether.

Thus, highly reactive etherified methyl ethers or methylol ureas are preferably used as reactive surfactants. Among the large number of reactive surfactants acceptable for the proposed method are non-ionic, anionic and cationic surfactants.

All binders used, preferably water soluble or dispersible, are used as binders. For example, acrylic resins, copolymers of monomers selected from the group: butadiene, styrene, acrylonitrile, melamine resins, epoxy resins, polyester resins, polyurethane resins, polyvinyl acetate, polyvinyl alcohol, polyvinyl chloride, natural latex and, in particular, products of epoxides.

The most suitable binders are the reaction products of epoxides, fatty amines and basic polyamides or dicarboxylic acids.

Reactive surfactants based on aminoplast precondensates and binders in the form of aqueous solutions or dispersions are prepared by known methods.

The proposed method for producing a nonwoven material is carried out as follows.

Example 1. 30 liters of water are poured into the vessel and then 2000 g of reactive surfactant based on the reaction products of melamine, formaldehyde and formic acid are added and 200 g of an aqueous 2% ethylcellulose solution are used as thickening agents. This mixture is stirred until the binder is fully distributed. Then, 25,000 g of a binder of a water-soluble substance based on the product of the interaction of polyepoxide, 1-amino eicosane, 1-aminodocozan and n-butyl glycol are added, and the pH is adjusted with stirring to 3. Then the bath is filled with water to 100 liters, the stirrer set so that the bath with stirring had the appearance of a funnel. Due to this position, the agitators introduce more air into the system. Stir until the amount of liquid in the bath increases to 5,200 l. This yen is impregnated with polyester fabric on a horizontal two-roll padding. The weight gain is 50-60%. After exiting the padding, the cords are dried for 10 minutes at 140 ° C and cured. 10 When dried, the reactive surfactant decomposes and loses its wetting ability, resulting in a long-lasting hardened nonwoven fabric.

Example 2. A staple is applied to the batt by padding a foamed bath of 200 g of a 50% aqueous emulsion of a binder from an acrylic resin obtained by copolymerizing the following monomers (parts by weight):

0 Butyl acrylate85

Acrylonitrile10

Acrylic acid5

Reactive surfactant based

methylolm urea

5precondensate4 (g)

Water50 (g)

Carboxymethyl Cellulose

(2.5% on) 40 (g)

MgCU (20%) 10 (ml)

The pH of the solution is adjusted to pH 3 by adding formic acid. Then the bath is foamed by stirring and blowing air. The weight gain of the batt is 30–60% with a padding. Then dried 10 minutes 5 at 140 ° C. After drying, the hydrophilic action of the reactive surfactant does not appear.

Example 3. A carpet of polyamide reinforced needle with needles was subjected to a silt using a bath of a mixture of 200 g of binder based on the product of the interaction of polyepoxide with a mixture of 1-aminoeicosane, 1-aminodocozan and n-butylglycol in a ratio of 98:31:50, and the following Components

5 (g):

Reactive surfactant based on methylol urea oleyl ether3

Methyl cellulose a

0 (5%) 40

Water150

MgCb (20%) 10 (ml)

Buti l glycol50.

The pH value is adjusted by adding mu5 rabiic acid to 2.8.

The bath is foamed by mixing and blowing air to double the volume. Weight gain with a plus is 40-60%. Zatey dried at 90 ° C. The reactive surfactant loses its wetting ability on drying, which eliminates the need for additional washing.

The method is not limited to the examples presented, any reactive surfactant 5 ctBa based on aminoplast pre-condensates can be used, as well as any polymeric binders capable of mechanical foaming in the form of aqueous solutions or dispersions. Pret, an invention of the method for producing a nonwoven material by impregnating a fibrous web from natural and chemical fibers with a foamed composition based on an aqueous solution or an aqueous dispersion of a polymer containing a surfactant, and subsequent heat treatment, characterized in that. The aim is to increase the strength of the nonwoven material, as well as to simplify the technology, to use the surface-active derivative of the aminoplast precondensate.