JPS62215098A - Papermaking release agent - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] This invention relates to a release agent for paper manufacturing, and particularly to a release agent for drying drums in the paper manufacturing process.

[Conventional technology]

In the papermaking process, there is a step of drying using a drying drum as a step after papermaking. In this process, the paper adheres to the drum, so how well to remove it is an important issue in terms of workability and paper quality.

Therefore, methods such as attaching a release agent to the surface of the above-mentioned drying drum have been conventionally adopted. In addition to chemically modified polybutene, mineral oils such as machine oil, animal and vegetable oils, and wax emulsions are also known.

[Problem that the invention seeks to solve]

However, the above-mentioned conventional paper-making release agents do not have sufficient release effects, especially in the drying process of toilet paper that contains large amounts of various additives such as paper-making chemicals, fillers, pitch, and resins. Although large amounts of various release agents are used in consideration of the above additives, their release effects are low, resulting in poor drying workability and damage to the drum surface and paper. .

Therefore, an object of the present invention is to provide a paper-making release agent that can facilitate the separation of paper from the surface of a drying drum and greatly contribute to improving drying workability.

[Means for solving problems]

As a result of intensive research to achieve the above object, the inventors have discovered that a mixture of high molecular weight wax and/or paraffin and silicone oil or its modified product is emulsified or dissolved in water and that a dry The present invention was completed after discovering that the present invention produced very good results in peeling paper from the drum.

That is, the present invention relates to a paper-making release agent comprising an aqueous emulsion or a water-solubilized mixture of a high molecular weight wax and/or paraffin and a silicone oil or a modified product thereof.

[Structure and operation of the invention]

The high molecular weight wax used in this invention is a normal natural wax or synthetic wax with an average molecular weight of 500 or more, especially 1.000 or more, such as beeswax, candelilla, carnauba, wood wax, monk's wax, and microcrystal wax. Examples include wax, low molecular weight polyethylene, polypropylene, Fischer-Tropsch wax, castor wax, and higher fatty acid glycerin ester.

The paraffin used in this invention is ordinary petroleum-based solid paraffin (melting point 105-165°F).
Alternatively, it may be a liquid paraffin such as liquid paraffin, machine oil, spindle oil, mineral turpentine, polybutene, and the like.

Furthermore, the silicone oil or its modified product used in the present invention includes, for example, dimethyl silicone oil or its methylstyrene, α-olefin, polyether, alcohol, fluorine, amino, mercapto, epoxy, carboxyl, higher fatty acid, carnauba, amide, etc. Examples include modified products, which are easily available as commercial products.

In the paper-making release agent of this invention, it is important to use such a wax and/or paraffin in combination with silicone oil or a modified product thereof. It is no longer possible to expect a significant improvement in releasability as intended.

In addition, in the paper-making release agent of the present invention, in order to better express the effect of increasing the release property by using the above-mentioned combination, wax and/or paraffin and silicone oil or a modified product thereof are mixed. It is used as a water emulsion or water solubilizer, which is emulsified or dissolved in water. At that time, an appropriate emulsifier or water solubilizer is required, but the type thereof is not particularly limited. That is, any of the commonly used anionic surfactants, nonionic surfactants, cationic surfactants, and amphoteric surfactants can be used.

Commonly used surfactants include, for example, Nishibe:
"Surfactant Handbook" (Sangyo Tosho Co., Ltd.), Soft Giken Publishing Department [: r Elucidation of the Functional Effects of New Surfactants and the Development and Practical Comprehensive Technical Data Collection of Applied Products'' (Management Development Center Publishing Department) etc., and a list of specific compound names will be omitted here.

In the water emulsion or water solubilizer of the present invention, the total concentration (concentration in water) of each of the above components, that is, the three components consisting of wax and/or paraffin, silicone oil or a modified product thereof, and an emulsifier or water solubilizer. is suitably about 5 to 50% by weight.

In addition, as for the ratio of the above three components used, first, wax and/or paraffin should account for 50 to 98% by weight of the total amount of wax and/or paraffin and emulsifier or water solubilizer, and silicone oil or The amount of the modified product is usually 0.1 to 10 parts by weight based on 100 parts by weight of the above-mentioned two components, that is, the wax and/or paraffin and the emulsifier or water-solubilizer.

If either component is too small or too large, it is difficult to obtain good results in terms of peeling performance.

According to the release agent for paper manufacturing according to the present invention obtained in this manner, it can be applied to the surface of the drying drum or paper surface with which the paper comes into contact during the paper manufacturing process by an appropriate means such as a coating method. By incorporating it into the paper at any stage in the papermaking process, the paper can be very easily peeled off from the above-mentioned kiss.

〔Effect of the invention〕

As described above, in this invention, by using an aqueous emulsion or aqueous solubilizer of a mixture of high molecular weight wax and/or paraffin and silicone oil or a modified product thereof, the peeling performance is improved compared to conventional ones. This dramatically improves the drying process and makes it easy to remove all types of paper from the drying drum, including the aforementioned toilet paper. This not only greatly improves drying work efficiency, but also allows for the production of superior quality paper. Obtainable.

〔Example〕

EXAMPLES Below, examples of the present invention will be described in more detail.

Using high molecular weight wax and/or paraffin and silicone oil (dimethyl silicone oil) or a modified product thereof shown in Table 1 below in Examples, the weight ratio of these two components and the emulsifier or water solubilizer is the same. A water emulsion or a water solubilized product was prepared to have the proportions shown in the table to obtain a papermaking release agent of sample N11l-11 according to the present invention.

The total concentration of the above three components (concentration in water) of these stripping agents was 20% by weight.

As the emulsifier or water-solubilizer, sample teeth 1 to 4 used an anionic surfactant, samples 11h5 to 7 used an anionic surfactant and a nonionic surfactant, and sample teeth 8 to 11h used an anionic surfactant and a nonionic surfactant.
No. 11 used a cationic surfactant, respectively.

Furthermore, in Table 1 below, the composition ratio in the mixed system of high molecular weight wax and paraffin means the weight ratio, and MW in the same table means the average molecular weight.

Comparative Example 1 Using wax and/or paraffin or polybutene shown in Table 1 below, a water emulsion or water solubilized product was prepared so that the weight ratio of wax and/or paraffin or polybutene to the emulsifier or water solubilizer was as shown in the same table. This was used as sample 1 for comparison.
1h12-14 as a release agent for paper manufacturing. All of these stripping agents have a total concentration of both components (concentration in water) of 2.
It was 0% by weight. As the emulsifier or water solubilizer, sample fish 12 uses an anionic surfactant, and sample fish 13 uses an anionic surfactant.
is an anionic surfactant and a nonionic surfactant,
For the sample teeth 14, a cationic surfactant was used.

Comparative Example 2 Spindle oil (sample 1'1h15) and average molecular weight 3
．． 000 polybutene (sample 11h16) was used as a papermaking release agent for comparison without being emulsified or dissolved in water.

A peelability test was conducted on each papermaking release agent according to the above Examples and Comparative Examples in the following manner.

The results were as shown in Table 2 below.

Peelability Test> To a 10% by weight solution of ethylene-vinyl acetate adhesive, 0.01% by weight of the paper strength enhancer and 0.04% by weight of the papermaking release agent of Example or Comparative Example were added. , and stirred for 5 minutes. Thin paper (thin paper, basis weight 20 g/n?) cut into 5 x 10 C11 was immersed in this solution, taken out, adhered to a 7 x 15 cm iron plate, dried for 1 hour in a dryer at 110°C, cooled to room temperature, and tested. Peaceful.

This test piece was set in an autograph, and a peel test was performed in a direction of 180 degrees with respect to the adhesive surface at a peel rate of 50 per second to determine the peel strength (force when separating the paper).

Table 2 As is clear from Table 2 above, sample N[
It can be seen that the release agents for paper manufacturing according to L1-11 all exhibit excellent release effects, but the release agents related to Samples 11h12-16 of the comparative example have inferior release effects.

Claims (1)

[Claims] (1) A release agent for paper manufacturing consisting of a water emulsion or water solubilizer of a mixture of high molecular weight wax and/or paraffin and silicone oil or a modified product thereof.