In order to increase the adhesive strength of the adhesive interlining, it is necessary to make a good adhesive

resin with good adhesion close to the properties of an acrylic resin emulsion (DR501). The new emulsion-type

urea-formaldehyde aqueous resin solution was prepared by adding urotropin to improve the water resistance

and adhesion strength of the adhesive significantly after the addition condensation reaction was completed. It

also developed a formula for adhesive core resin paste with emulsion resin as a feedstock, thus making full use

of existing production processes and equipment, raising production efficiency and operating rate of equipment

and improving the quality of products. In this regard, the paper adjusted the viscosity of the resin paste to 120

Pa•s, further improved the viscosity of the resin paste so as to better capture and fix the polyester powder, and

developed a rational formula for doubling the water resistance, brittleness and adhesive strength of urea resin.

Keywords: Adhesive Interlinings, Urea Resin, Adhesive, Textile

and the powder that falls on the resin adhesive is adhered to the resin adhesive, so it is heated and melted to the

substrate through heat treatment to produce an adhesive interlining.

However, resin adhesives prepared from acrylic resin emulsions DR501 and DR402 were gelatinized and

cured at room temperature after a certain period of time, during the process of production, by filling the fine

pores of cylindrical screens to stop production and frequent washing of the screens with organic solvents, as

well as their ability to trap and fix the resin powder due to the short duration of retention, resulting in poor

quality of the adhesive interlining produced and very low adhesive strength.

Therefore, we developed new adhesives to improve the quality of products and put their production on a

normal footing and applied them to various fields of the interlining cloth production and textile industry, thus

making it possible to diversify textile products, reduce the cost of various kinds of fabrics including interlining

properties(2).

In this paper, we first selected a thermosetting urea resin material based on urea and formaldehyde and

developed a new emulsion-type urea-formaldehyde aqueous liquid resin with better adhesion performance

compared to the conventional material (DR501).

The urea-formaldehyde resin known so far is divided into molding, adhesive and foaming media according to

the pH of the medium and prepared via an initial condensation step.

However, the above materials are additional condensation reactants produced in the presence of inorganic

catalysts and viscous liquids or polymeric compounds prepared by vacuum dehydration process in the presence

of organic formaldehyde. It is also unsuitable as a material for the production of adhesive interlinings for

clothing because of its poor water resistance, brittleness, moisture absorption and low adhesion strength.

strength, and brittleness of the developed urea-formaldehyde emulsion resin.

It also confirmed the formula for adhesive core resin adhesive with emulsion resin as a feedstock to raise the

production efficiency and operation rate of equipment while using existing production processes and

equipment and improve the quality of products much more than those of raw materials.

In this regard, we developed a rational formula for doubling the water resistance, brittleness and adhesive

strength of urea resin by adjusting the viscosity of the resin adhesive to 120 Pa·s, increasing the viscosity of

the resin adhesive so as to better capture and fix the polyester powder.

In the reaction of urea with formaldehyde, methylation (addition) and methylation (condensation) reactions are

competing repetitions to grow urea resin molecules(3, 4).

Methylenation Reaction (Condensation Reaction)

=1.8·10

+0.004[H

], S

- forward rate constant;

k

- inverse rate constant.

The production reaction of dimethylol urea also follows the same trend as that of monomethylol urea. Thus,

As shown in the graph, the condensation reaction rate in the alkaline region is slow, but the addition reaction

rate is very fast. Hence, the urea resin produced in the basic medium is not actually a polymer, but a

condensation of methylol ureas with a degree of polymerization of 1-3. Thus, the production of urea resins in

weakly alkaline media, i.e. organic catalysts, is a guarantee for the preparation of emulsified

urea-formaldehyde water-soluble adhesive resins.

In addition, depending on the molar ratio of urea to formaldehyde, the storage stability, adhesiveness, curing

time, compatibility, and free formaldehyde content of the resins are affected, typically in the ratio of 1:1.5 to

2.5, and the reaction temperature depends on the content of free formaldehyde, so we adjusted the reaction

time between 0.5 and 1 h at the reaction temperature of 70-80 °C.

Hence, we have developed an emulsion-type urea-formaldehyde water-soluble resin material that has been

incubated for 24 h after an organic-catalyzed urea-formaldehyde initial condensation reaction followed by the

addition of urotropin as a curing agent to improve its storage stability, water resistance and adhesion strength.

Combination recipe of plume base resin treatment solution in plastic immersion machine with emulsion urea

resin as feedstock is shown in the following table.

Table 1. Comparison of bottom resin treatments used in the resin immersor

To further improve the properties of the new urea resin emulsion, the acrylic resin emulsion was used as an

additive rather than as a feedstock, so that the properties of the resin adhesive were much better than those of

the sole material.

Combination recipe of feather, fabric-based dotted resin treatment solution through cylindrical screen of

interlining machine is as follows:

Table 2. Comparison of the formulation of the spotted plastic treatment solution used in the drum screen

exhibiting viscosity, and when ammonia gas is released over time, it is converted back into an emulsion sol,

changing the pH of the solution, thus raising the storage stability of the solution and adjusting the pH to be