JPS62125097A - Production of paper strip impregnated with synthetic resin in solution or dispersion form - Google Patents

Abstract

A description is given of the soaking or impregnation of a paper web consisting mostly of cellulose fibres by a combination of dispersions and solutions of synthetic resins in a roll-type application unit installed in the papermaking machine, where the nature, degree of beating and dispersion particle size and the mixing ratio of dispersion and solution are matched to one another, for the manufacture of a fibre-containing sheet, in particular for covering parts of furniture.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application: The present invention relates to a process for the production of composites in the form of solutions and dispersions, stirred with resin.

BACKGROUND OF THE INVENTION It is commonly used and known to completely cover the casings of television and radio equipment, audio equipment and other furniture parts with gelastec films.

For this purpose, a thick PVC film is used which covers the buttocks.

This PVC film is glued onto a wood chipboard, for example, and
Furniture parts or housings are subsequently produced from this composite material in one operation using the principles of the furniture industry. In other words, a ■-shaped groove is cut into the inside of this book N&, and then &.
are folded or folded in this machine, and thus casings, furniture parts, etc. are manufactured in one operation step.

One advantage of this method is that the creases do not create scratches on the film. A disadvantage of this method is that the written PvC film must be subjected to a corresponding human blood treatment, for example a corona discharge treatment, directly before its use in order to obtain good printability.

Historically, wood erasers must have a very clean and smooth bottom surface (thin film application) in order to still achieve economically acceptable results.

However, a particular disadvantage is that the PV
The C-film exhibits extremely poor dimensional stability (elongation/contraction behavior), low post-stretch strength, low initial stability, exceptionally high *ti conductivity and 75° C~8
9, which already undergoes softening at 5°C. Furthermore, i2o'
Heat beyond c'. In this case, no HC separation occurs.

From the description in publications, for example US Pat. It is known to apply at least enough fluorophore to the surface of the paper strip to achieve complete saturation, and then to guide the fluorophore into the absorbent layer, The impregnating liquid is absorbed onto other surfaces in this absorption medium. However, the resin bath liquid is a resin based on silver resin, melamine resin, and phenol fat, contains formaldehyde, and produces a brittle product.

In the case of this method, the base paper strip is produced after 7)!
, it is necessary to feed the two devices, drain it, impregnate it using additional preparations such as absorbent zones and dried blood, and reconstitute it.

Historically, in the case of this method, the distribution of impurities across the paper-like cross-section is non-uniform, thus resulting in strongly impregnated and slightly impregnated bands, which leads to the decomposition of the paper core. occurs.

West Germany, +! +Considering Patent Application Publication No. 30243, a method is described in which a plastic #neel is made in a paper machine by carrying out this impregnation in a groupless rock. However, the recoating of the paper strip in a pressing machine with an impregnating liquid, which is not specified in detail, is only complete if this M strip is already preimpregnated, i.e. also in this case. It requires a specific binding.

The problem that the invention seeks to solve: The object of the invention is therefore to provide a solution that does not have the disadvantages of the pure glass used in conventional methods, yet also exhibits better readability, is water resistant and is suitable for bathing. F9. in film form, having excellent stability against agents and internal strength and good dimensional stability against the effects of moisture and temperature changes. The purpose is to obtain Mingjiang government-owned municipal materials.

Historically, this material could only be produced in an economical manner from advantageous raw material stores, with as few additional processing steps as possible, excluding the production of the ejected paper phosphor itself. It won't happen.

Moreover, it is also possible according to the invention to soak and impregnate the base paper as completely as possible by selecting a suitable coating device or dipping method and, for example, by determining the grinding state and degree of grinding, the fiber material. When determining the absorption capacity, the properties of the impregnating mixture or the coating mixture, the porosity and the coating roughness δ, i.e. its surface tension, viscosity, @electrification, and properties of the paper such as solid paper. should be given only.

Alternative means for solving the problem: According to the present invention, the strip is made of a cellulose mixture with high absorbency and strength, which has been milled to a maximum degree of grinding of 65° SR. forming and impregnating liquid,
7.5 to 10, consisting of a mixture of an aqueous anionic copolymer dispersion and an anionic polymer water bath, the application being carried out in the dry section of the paper machine using a grooveless method. be done. The price of the ox is 8-9
In the darkness.

According to the present invention, the cellulose in paper form is made from eucalyptus gruel-cellulose and pine wood sulfate-cellulose.
: 50-10:90, especially 30:70-15:l:1
It is made up of a ratio of 5.

The degree of grinding is particularly between 15 and 25°SR.

The fiber material of the paper strip contains a wet solidifying agent, a dry solidifying agent, a settling agent, a synthetic side fat dispersion, a surfactant, a coloring net, and a brightening agent, which affect the properties of the base paper. Other chemical auxiliaries such as can be added.

The filling is white pigment, V is TiO2, white is kaolin.

1 to 5 times SJ. For example, formaldehyde-free wet solidifying agents in the form of polyamide amine-acrylic rolyhydrin resins can be used in amounts of 1 to 20% based on absolute etiquette textile materials, such as acrylic esters or styrene-butadiene. Based on the addition of synthetic side fat dispersion and absolute zero resistance to textile materials.
The addition of a surfactant to improve the wettability of the paper with 5% violet has been found to be of significant benefit in the present invention.

According to the present invention, if the world uses aqueous dispersions of anionic copolymers which can be precipitated on the basis of acrylic powders, acrylic esters, vinyl acetate and/or sterols, the dispersed particles , especially 0.2
μ, the degree of film formation is slight to moderate, and the minimum film formation temperature is 60°C or less on the hakama.

The ratio of the copolymer of the dispersion to the copolymer of the bath liquid is between 500:1 and 1:1, preferably 100:1, relative to the active agent.
:1 to 10:1, that is, 10 parts of the dispersion liquid to 1 part of the bath liquid or 1 part of the bath liquid.

It is also within the scope of the invention to use other plastics, such as styrene-butazoene-copolymers, polyurethane dispersions or polyolefin dispersions, as well as impregnating agents such as urea-formaldehyde or melamine-formaldehyde. It is also possible to add sanitizing solution for dipping.

The brittle nature of the impregnated paper can be counteracted by using a mixture according to the invention which contains a sintering agent.

In addition, other additives such as wetting agents, anti-foaming agents and antifoaming agents, pigments, dyes and antifoaming agents are also added to this mixture. , can also be done.

As wetting agents and penetrants used are agents which change the surface tension between the liquid phase and the solid phase, such as surfactants and emulsifiers.

According to the present invention, maleic copolymers and clothing [11
1. By changing the tension in combination with the above-mentioned proboscis, the penetration of the permeation can be advantageously regulated.

According to the invention, the impregnating agent is used in the form of a mixture of solutions and dispersions with a solids content of 5 to 60%, the viscosity being 10 to 60 s (according to DIN cup). 4 m).

The impregnating mixture and the coating mixture are spread onto the fiber m7+) in a roll press machine in the paper machine. In this case, according to the invention:
The fiber fleece, with a dry content of 98-92%, is fed through a Dull-Bress machine, thus ffling on both sides takes place.

According to the invention, after this first treatment step of impregnation, the m-fiber fleece is further coated on one side or on both sides.
This can be carried out in the paper machine using copolymer mixtures which are the same or which are prepared in the same manner, in which case intermediate drying has to be carried out in two separate process steps.

By subsequently applying a coating on one side of the Ifi-bedded strip, a dense surface is provided which results in good printability or lacquerability or coatability. Historically, only when one side is surface coated, this surface coating is
This can be done using a knife-dropping device. Rolling the coated paper strip on one side can be prevented by additionally applying a coat on the surface.

The paint applied in this way can be, for example, a powder or a thick water bath of CMC. The impregnated, single-sided coated strip can be additionally finished, for example using known mechanical finishing equipment or in a calender in a separate cutting process, to still achieve the desired marking properties on the cut side. and lacquer application possibilities increase.

Said film, applied in this way, has a specific thickness and a specific density depending on the pressure used during the removal of the fleece surface and the finishing of the reacted and pre-laid normal body. ,
A rigid substrate with a soft emblem on the hakama, for example a stable composite, suitable as a decorative protective covering for furniture parts, such as casings of television and radio equipment or casings of audio equipment (casing shells). be. By using this economically economically producible fiber-containing film, the disadvantages mentioned above when using PVC films or other plastic films are avoided.

The fiber-organized films obtained according to the invention, which have high readability, dimensional stability against temperature changes and good barrier properties against water and solvents, can also be used for other purposes, e.g. Cylindrical abrasive paper substrates for wet polishing, printed carriers and general carriers, wall materials for packaging (e.g. dimensionally stable table hangings with or without combustible raw materials) , are particularly suitable as support nails for adhesive chips, e.g. floor coverings.

Example: Next, the present invention will be evaluated with reference to examples.

Example 1 According to the invention, a base paper with the following composition and conditions is obtained on a duplex paper machine as a two-layer paper: pinewood sulfate-cellulose
80%.

Eucalyptus Tsukuda - Cellulose 20%.

Grinding degree 30'SR (Chopper Leader (5cho)
pper-Rlegler)).

Additives, commercially available (calculated on absolutely dry cellulose): Merck 1%.

Formaldehyde-free wet method %formula% Wetting and dispersing agents [J, 3%.

This base paper, with 1 violet per unit area of 909/m 2 , was impregnated on the inner side in a groupless machine with a dispersion and an aqueous synthetic seborrheic compound according to the invention in a ratio of 20:1. Surprisingly, with the synthetic resin mixture according to the invention, a strong rebound effect characterized by layer strength and stiffness, even without taking into account the resulting water absorption, is possible due to the dispersion used and the It is definitely based on synergistic young fruits due to #r,
These dispersions and baths, when used alone, also cannot achieve the intended good paper properties at all.

The following example proves this fact.

The glue treatment solution had to be adjusted partially with water to an optimal viscosity (<60S, 4 mm by DIN cup).

Formula for groupless machine: 1-Synthetic resin monodispersion alone (anionic copolymer aqueous dispersion based on acrylic ester, acrylonitrile and styrene), solid gold 1t50%, average particle size about 0.1μ, Moderate film hardness, minimum film formation temperature 1
℃.

2-Plastic dispersion diluted with water, t25%
1 6-Plastic bath solution diluted with water alone (anionic water bath solution of cal-1-mexyl group-containing copolymer based on anhydrous maleic CR), solids content approximately 12%.

4-Plastic solution diluted with water, formaldehyde-free wet setting explosive, solids content approximately 10%.

5 - Ratio 20 with addition of formaldehyde-free wet setting agent and defoaming wound diluted with water to about 25% solids content.
: A plastic mixture according to the invention consisting of a dispersion of 1 (according to Example 1) and a bath liquid (according to Example 6).

Pure plastic dispersion 'e, (formulation 1) actually reduces water absorption the most strongly due to its good film-forming properties, but its penetration into the base paper is insufficient. This is evidenced by the only slightly improved values in terms of strength and stiffness of the layer.

By diluting this dispersion with water (formulation 2), a strong penetration into the base paper is achieved when the water absorption increases at lHj and the elasticity of the impregnated paper is still insufficient.

Furthermore, insufficient impregnation is manifested in insufficient combing strength of the dyed surface. Impregnating the base paper with a synthetic antifat bath solution (prescription 6) diluted with water actually leads to improved elasticity, but it also deteriorates significantly and reduces the frequency of the 71c layer.

Also, the addition of a wet setting agent (formulation 4) does not result in any change in the essential properties of the impregnated paper.

About 10% higher enhancement, lower specific water absorption and highest elasticity than for formulation 2 (about 10% more than for formulation 6)
The desired high impregnating effect of the glue treatment liquid, characterized by a low stiffness (% low stiffness), and thus all the intended good paper properties, is achieved for the first time with the synthetic resin mixture according to the invention (formulation 5) of dispersions and solutions. .

The unexpectedly high effect of the effects of the individual components (dispersion, solution, wet solidification) is due to the synergistic effect of the dispersion and bath liquid.

? 112 In another series of tests, a medium hardness synthetic, cut resin dispersion (5) was replaced by a hard fraction te liquid with a grain size of about 0.15μ at a minimum film formation temperature of about 25°C. The dispersion was an aqueous copolymer dispersion based on acrylic liquid ester and styrene.

The following properties of the base paper impregnated with this dispersion were observed (described briefly to facilitate understanding of the results obtained using Formulation 5 from the previous first test): 6-Formaldehyde Wet-cured with no additives,
Synthetic side fat extract diluted with water, solids content approximately 25%.

7 - Synthetic resin according to the invention consisting of a dispersion in the ratio 20:1 and a bath liquor according to Sali 6, diluted with water to a solids content of about 25%, with the addition of a formaldehyde-free wet setting agent and an antifoaming agent. blend.

Using pure synthetic side fat adversary according to formulation 6, formulation 1
As has already been demonstrated in case 2 and 2, the intended high impregnating effect ii: cannot be achieved. For the first time, the desired paper properties were investigated for the combination according to the invention of dispersion and solution; However, the result is better than the case.

Next, the paper that is contrary to the present invention is extracted, so that the stiffness is about 10 to 20 times higher and the water absorption power is about 15 to 2 times higher.
0, but the layer strength remains almost unchanged.

In the immediately following tests, the synthetic flank mixture according to the invention of dispersion and bath liquid was used to impregnate base paper according to Example 1 in a ratio of 2:1 with a raw wood-formaldehyde resin combination.

Synthetic side fat dispersion according to formulation B alone in combination with urea-formaldehyde resin at a ratio of 8-1:2.

Synthetic cutting mixture according to the invention consisting of a dispersion and a solution (in a ratio of 20:1) according to formulation 7 in combination with a urea resin in a ratio of 9-1:2.

Solid gold in combination with urea-formaldehyde & (fat) in a 10-1:2 ratio
, moderate film hardness, extremely low skin formation temperature of 12°C,
Synthetic resin dispersion alone (anionic copolymer aqueous dispersion with acrylate as a substrate).

11-1:2 ratio in combination with urea resin 20:1 ratio
A synthetic resin mixture according to the invention consisting of a dispersion (according to formulation 10) and a bath liquid (according to formulation 6).

The resulting properties of the impregnated paper are listed in the following table: It is also possible to mix the synthetic resin dispersion and the dipping material, such as urea-formaldehyde material (for example, this can be used to separate the decorative base paper). (commonly used for impregnation in impregnating equipment) leads to improved properties of the base paper. In this case, the type of synthetic side fat dispersion used dictates the processing liquid absorption, porosity, water absorption and degree of water enhancement (see formulations 8 and 10).

However, it is not until the inventive synthetic m-side mixture of dispersions and bath liquids that this special immersion resin - synthetic resin -
The desired high impregnation effect and thus the intended properties of the impregnated paper are also observed in the case of the combination (formulations 9 and 11). For this purpose, for example, the porosity and the water absorption are significantly reduced and the layer gi& is increased. However, the level of enhancement is slightly lower than in formulations 1 and 2 due to the relatively high pickling resin content.

Claims (1)

[Claims] 1. A method for producing paper strips impregnated with synthetic resins in the form of solutions and dispersions, wherein the strips are heated to a maximum of 35°SR.
Formed from a high absorbency and strength cellulose mixture that has been ground to a grinding degree of
Synthesis in the form of solutions and dispersions, consisting of an aqueous anionic copolymer dispersion and a mixture of an anionic aqueous solution, having an anionic aqueous dispersion, characterized in that the application is carried out in the dry section of a paper machine using a groupless machine. Method for manufacturing paper strips impregnated with resin. 2. The method according to claim 1, in which the pH value is adjusted in particular to a range of 8 to 9. 3. The cellulose of the paper strip is prepared from eucalyptus tree-cellulose and pine wood sulfate-cellulose at a ratio of 50:50 to 10:90, especially 30:70 to 15:85.
2, optionally in combination with synthetic fiber materials, and particularly cut and ground to a grinding degree of 15 to 25° SR. . 4. A pH-adjusting agent, a wet solidifying agent, a dry solidifying agent, a synthetic resin dispersion, a precipitant (fixing agent),
4. A method as claimed in any one of claims 1 to 3, in which other chemical auxiliaries such as surfactants, colorants, fillers, etc. are added. 5. Acrylic acid, acrylic ester, or acrylic having an average particle size of 0.2μ or less, a slight to medium film hardness, and a minimum film formation temperature of 30°C or less as a dipping agent or coating agent for treating fleece fibers. Aqueous dispersions of customary anionic copolymers based on nitrile, vinyl acetate and/or styrene are prepared by mixing maleic anhydride or maleic acid with, for example, styrene, acrylic acid, acrylic esters, etc. in a ratio of 100:1 to 10:1 (effect). (calculated for the substance), especially in combination with customary anionic aqueous solutions of the basic copolymers in a ratio of 25:1 to 15:1, as well as other additives, such as hardening aids, viscosity-controlling aids. , in combination with anti-adhesion and penetration aids and pigments and dyes. 6. The method as claimed in claim 1, wherein the mixture of dispersion and solution additionally contains a surfactant content. 7. According to any one of claims 1 to 6, the content of the surfactant is 0.05 to 1.5% based on the mixture consisting of the dispersion and the solution. the method of. 8. The infiltration of the fiber fleece of the paper strip is carried out in the paper machine in a first processing step by roll coating on both sides, and the coating is carried out in a second processing step by knife coating on one side, this knife 8. A method according to claim 1, wherein the application is coupled with surface polishing of the paper strip. 9. One of the claims 1 to 8, wherein the paper strip is subjected to a surface post-treatment on one side after drying and surface polishing, such as coating, printing and/or lacquering. The method described in section.