JPS5930997A - Production of paper - 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] The present invention relates to a method for manufacturing paper.

When manufacturing paper, it is customary to add various chemicals to improve the performance of the product, including various paper strength enhancers,
Sizing agents, reactor water quality improvers, filler retention improvers, etc. are used.

However, the addition of these chemicals often causes problems such as staining the papermaking equipment, and in particular, the deterioration of the peelability of paper from the dryer drum in the dryer part of the paper machine is caused by stains on the dryer drum and paper scraps. This has caused an outbreak and has become a major problem.

As a countermeasure for this, paraffin emulsion,
At present, satisfactory effects have not yet been obtained.

The inventors of the present invention have conducted extensive research to solve this problem, and have discovered that a reaction product of aliphatic modified aminopolyamide and epichlorohydrin is added to the pulp slurry or wet paper before it is sent to the dryer part during the papermaking process. They have found that this is extremely effective in improving the peelability of paper from the dryer drum, and have completed the present invention.

That is, the present invention uses 0.8 to 0.9 mol of dicarboxylic acid and 8 to 2 carbon atoms per mol of polyalkylene polyamine.
The reaction product obtained by further reacting epichlorohydrin with the aliphatic modified aminopolyamide obtained by reacting 1.4 to 0.2 mol of higher fatty acid of No. 6 with 1.4 to 0.2 mol of higher fatty acid of No. This paper manufacturing method is characterized by:

The polyalkylene polyamine used in the present invention has, for example, the following structural formula (I> f(2N4CnH2n Nl(%I(,CI)) (in the formula,
n is an integer of 2-6, and X is an integer of 2-4. ) Specific examples thereof include diethylenetriamine, triethylenetetramine, tetraethylenepentamine, etc., but are not limited to these.

Further, the dicarboxylic acid that can be used in the present invention has, for example, the following structural formula (n) [000-R-000H(n) (wherein R is a saturated or unsaturated divalent aliphatic hydrocarbon group, a divalent alicyclic hydrocarbon group or divalent aromatic hydrocarbon group), specifically malonic acid, succinic acid, glutaric acid, adipic acid, fumaric acid, maleic acid,
Examples include phthalic acid, and these dicarboxylic acids can be used alone or in a mixture of two or more. Among the dicarboxylic acids used in the present invention, the number of carbon atoms in the formula is 1.
~6 aliphatic dicarboxylic acids are preferred.

On the other hand, the higher fatty acids used in the present invention are higher fatty acids having 8 to 26 carbon atoms, preferably 12 to 18 carbon atoms, such as lauric acid, myristic acid, balmicylic acid, and stearic acid.

In the present invention, the amount of dicarboxylic acid to be reacted is 0.8 to 0.9 mol per 1 mol of polyalkylene polyamine. The degree of polymerization does not improve, it becomes difficult to obtain sufficient fixation of the desired final reaction product to the pulp, and if more than 0.9 mol of dicarboxylic acid is used, there will be a small amount of higher fatty acids that can react.
In either case, it becomes difficult to obtain the main effect of the present invention, which is to improve the peelability of paper from the dryer drum in the dryer section of a paper machine.

Furthermore, in the present invention, if the higher fatty acid content is less than 0.2 mol, it becomes difficult to exhibit the effects of the present invention, and even if it exceeds 1.4 mol, it becomes difficult to obtain a commensurate improvement in the effect.

The pulp used in the present invention mainly uses tco fibers extracted from natural products such as wood, but synthetic aM and mineral fibers may be mixed as appropriate.

In the method for producing the reaction product of fatty acid-modified aminopolyamide and epichlorohydrin in the present invention, an example of the reaction method for each raw material is as follows: First, 0.8 to 0.9 mole of dicarboxylic acid is added to 1 mole of polyalkylene polyamine. Mix and heat both in the same proportion. In this case, the reaction temperature is generally 1
The reaction time is 1 to 8 hours at 40 to 240°C.

The obtained reaction product is then mixed and heated with 1.4 to 0.2 mol of a higher fatty acid having 8 to 26 carbon atoms to obtain fatty acid modified Ashiba noboliamide. In this case, reaction (5) is also generally carried out at a reaction temperature of 140 to 240°C and a reaction time of 1.
~6 hours.

There are various methods for reacting the obtained fatty acid-modified aminopolyamide with epichlorohydrin. For example, the fatty acid-modified aminopolyamide is dispersed in hot water of 40 to 100°C and then reacted with epichlorohydrin.

In this case, epichlorohydrin is added at a ratio of 0.5 to 4 moles per mole of the polyalkylene polyamine used, and the mixture is reacted at a temperature of 40 to 100° C. for 0.5 to 8 hours.

The reaction product of the fatty acid-modified aminopolyamide and epichlorohydrin obtained in this way may be further added with an inorganic acid or an organic acid to adjust PIII, if necessary.

In the present invention, when adding the reaction product of aliphatic modified aminopolyamide and epichlorohydrin to the pulp slurry, various agents such as paper strength agents, sizing agents, and furnace water properties improvers may be added simultaneously or separately, or in some cases. can be added to these (6) drugs after being mixed in advance.

Moreover, when adding to wet paper, it can be carried out using a spray or the like.

The present invention will be explained below with reference to Examples.

In the text, parts and % are parts by weight and % by weight.

Example 1 108 parts (1.0 mol) of diethylenetriamine was added to 78 parts (C0.5 mol) of adipic acid, and the mixture was heated at 150 to 160°C.
After reacting for an hour, 284 parts (1.0 mol) of stearic acid was added, and the reaction was continued for another 6 hours at 150 to 160°C, and water was distilled off. The obtained fatty acid-modified Aminoboria turf was dispersed in 1700 parts of 80°C warm water, and then 189 parts (1.5 mol) of epichlorohydrin was added and the mixture was dissolved at 95°C.
Allowed time to react. Next, 1150 parts of water was added to obtain a white suspension with a solid content of 15%. This is designated as sample A.
A mixture of NBKP and LBKP at a weight ratio of 1/1 is beaten to 43 cc08F, and this product (hereinafter abbreviated as PAE resin) is 0.2 to 0.8% (amount of active ingredient added per bulb) and Sample A was added in an amount of 0.05 to 0.1% (active ingredient addition per pulp), and after stirring for 1 minute, a wet paper was prepared using a TAPPI standard paper machine (dry basis weight 609/n). ?).

Cut this wet paper into 50 pieces in width and 100 pieces in length.
It was attached to a cast iron plate with a mirror-finished surface kept warm at ℃, and immediately press-dried at a pressure of 2 kg/- for 1 minute while removing the generated water vapor under reduced pressure with a cotton cloth-covered plate equipped with a vacuum suction device. Immediately after pressing, attach the long end of the dried sample paper to a tensile testing machine and test it for 100 m in the perpendicular direction.
Peel tests were performed at a speed of n+/min. For comparison, a test was conducted in the same manner as above without adding Sample A.

The above results are listed in Table 1.

Example 2 146 parts (1.0 mol) of triethylenetetramine was added to 88 parts (0.6 mol) of adipic acid and reacted at 150 to 160°C for 2 hours, and then 227 parts (0.8 mol) of stearic acid was added. The reaction was further continued for 4 hours at 150 to 160°C, and water was distilled off. 1,500 parts of water was gradually added to the obtained fatty acid-modified aminopolyamide to form an emulsion, and 199,100 parts (1.08 mol) of Ebichlor was added to make 9.
React at 0°C for 8 hours.

Next, 2750 parts of water was added to obtain a pale yellow suspension with a solid content of 10%. This is designated as sample B.

Using Sample B, the same test as in Example 1 was conducted and the results are shown in Table 1.

Comparative Example 1 A white suspension with a solid content (9) of 10% was prepared using the same synthesis method as in Example 1, except that the raw material composition was 189 parts (0.95 mol) of adipic acid and 28 m (0.1 mol) of stearic acid. I got the liquid. This is designated as sample C.

Comparative Example 2 A white suspension with a solid content of 10% was prepared using the same synthesis method as in Example 1, except that the raw material composition was 29 parts (0.2 mol) of adipic acid and 454 parts (1.6 mol) of stearic acid. Good deal.

Use this as a sample.

The samples obtained in the above two comparative examples were subjected to the same test as in Example 1, but the peeling effect was poor. The results are shown in Table 1.

Table 1 (10) (Note) Added fi (%) is the amount of active pharmaceutical ingredient used per pulp.

(11 completed)

Claims (1)

[Claims] A fatty acid-modified aminopolyamide obtained by reacting 1 mole of polyalkylene polyamine with 0.8 to 0.9 mole of dicarboxylic acid and 1.4 to 0.2 mole of higher fatty acid having 8 to 26 carbon atoms is further added with epichlorohydrin. A method for producing paper, which comprises adding a reaction product obtained by reacting the above to pulp slurry or wet paper.