JPS6094661A - Base fiber sheet for alkali resistant roll - 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 the construction of a base fiber sheet for rolls that has excellent alkali resistance compared to the percentage of fiber material that constitutes the flesh of industrial rolls.

Conventionally, nonwoven fabric has been used as one of the base fiber sheets used to form the flesh of alkali-resistant rolls, but it is possible to attach a fiber web of a different type, such as polyethylene or polypropylene, which has excellent alkali resistance. Since there is no suitable adhesive, we use binder-free non-woven fabrics that do not use binders.
Also, holipropylene spunbond non-breathing fabric is used. However, because this type of nonwoven fabric has a high apparent density and a low porosity, it currently does not have the necessary elasticity and liquid retention capacity as a roll base material. In addition, treatment with a surfactant has been considered in order to satisfy the amount of liquid retained, but this has not been commercialized due to lack of sustainability in alkaline solutions and poor performance.

The present invention improves the drawbacks of the conventional roll base materials using polypropylene fibers, and uses a special boria resin that is reactive with polypropylene fibers! 5-reactive terminal carboxyl modification (0OOH
) binder and glycidyl group (-CIaHi+ Q
The present invention provides a base fiber sheet for an alkali-resistant roll, which is impregnated and fixed with a binder containing a hardening agent having the following:

That is, the reactive special polyamide resin used in the present invention refers to ε-aminocaproic acid (HegM-(OHa)t0OOH) and C-capro5pp, which are raw materials for nylon 6.
HM to count votes from A (HN-(OHm)e ao)
By adding water and mixing methanol during the condensation polymerization process to form a chain polymer of (OHm)aoONH(OHa)a 00)n, 10 to 50 da of hydrogen in e-cab tetralactam can be converted to dimethylamino It refers to a product substituted with a group (M-(OHs)*) (hereinafter referred to as special boria-dend resin).

A base fiber sheet is formed using a composite fiber in which polypropylene fibers are mixed with a special polyamide resin in which 10 to 50% of the hydrogen of the 8-cabroctam has been substituted with dimethylamino groups, and then reactive terminal carboxylic acid is modified. (-o
Dimethyl groups (-OHs) are formed by impregnating the 8BR%NBR latex with a binder solution containing a curing agent having glycidyl groups (-Ox Htz O-), attaching it to a predetermined amount, drying, and keying. and Grisi')
k! Polypropylene composite maK, sBR containing the above-mentioned special polyamide resin, in which (-6△a-) and □8△7, 1□7 dyl groups are reacted, respectively.

HER resin has strong adhesion, and glycidyl ester (H℈0-OHgOooR) is added to the glycidyl group of the curing agent.
In the formula, the R group is palmitin # (OutHsx)
, stearin # (O1〒1Iss), oleic acid (O
By introducing a reactive active group such as HST, it can adhere to the fiber surface and improve the water absorption and liquid retention properties necessary for a poly base material. The strength as a roll base fiber sheet is provided by mechanical bonding by needle punching and chemical bonding by PI-PP composite fibers, SBR, NBR, etc., and the elasticity as a roll base material is BBR%N B RQi ;
(A breakthrough with D elastomer resin that provides alkali resistance, high strength, elasticity, and excellent water absorption and liquid retention properties that could not be achieved with conventional fiber sheets for roll base materials made of polyethylene and polypropylene fiber nonwoven fabrics.) The present invention provides a base fiber sheet for alkali-resistant rolls.

Next, the configuration of the present invention will be explained based on the drawings.

FIG. 1(a) is an explanatory diagram of the structure of the polypropylene composite fiber 4 containing a special polyamide resin dispersed therein, which constitutes the base fiber sheet 1 for alkali-resistant rolls of the present invention shown in FIG. 1fp). A special polyamide resin 3 in which the 10th to 50th hydrogens of 8-cabroxtam are substituted with dimethylamino groups is uniformly dispersed inside and on the fiber surface. Figure g2 is for forming the same base fiber sheet.
This is a cross-sectional view of the polypropylene composite fiber 4 shown in FIG. 1 (0) which has been treated with a nystomeric binder and is cross-linked with a 6-terminal carboxyl-modified 8BR latex with a curing agent having a glycidyl group to form a 98BR elastomer resin. Layer 5 coats the fiber surface. Due to the action of the glycidyl group, p
The methyl groups of the special polyamide resin 3 and the carboxyl groups of the 1iIIR elastomer resin 5, which are dispersed in the polypropylene composite fibers, react and crosslink, respectively, and the polypropylene composite #ia and 191R (D) become hardened to IJjR, and at the same time, the alkaline solution Forms a durable film against
The polypropylene composite fiber 4 containing a special polyamide resin and the X'N-PP core-sheath m-associated fiber 6 constituting the base fiber sheet are bonded by heat fusion as shown in FIG.

Next, the present invention will be explained in more detail with reference to Examples.

A mixed fiber of 511g 70% of polypropylene composite fiber containing a special polyamide resin and 60% of P11i-PP core/sheath type composite fiber is formed into a cross web with a basis weight of 80P layer using a carding machine. Next, use a needle punch machine, number of punches is 50 pact, depth of punch is 14
Needle punching is performed under the conditions of the fight, followed by t! By passing through a dryer adjusted to a humidity temperature of 10°C and melting the I'1ll-PP core tI@ type well-matched fiber], the fibers are entangled with each other by needle punching and PI! By fusing component I, a nonwoven fabric mat with a thickness of about 1 layer and having strength was formed.

Next, impregnation processing was performed with a binder liquid having the following composition.

Carboxyl-modified 8BR latex 100 parts Eboxy emulsion (Catalys manufactured by Teikoku Kagaku Sangyo) 90) I Di water concentration 20% After impregnation, squeeze with a mangle, dry and heat so that the solid content is 50%. Weight 1501! A base fiber sheet for an alkali-resistant roll having a thickness of 1.0 mm and a thickness of 1.0 mm was obtained, which had high strength, excellent water absorption, liquid retention, and rebound resilience.

Next, the base fiber sheet according to the present invention was used to form a silole according to the following procedure. That is, as shown in Figure 4, the outer diameter (middle) is 250 gates φ, and the inner diameter (g) is the key 1 of the shaft.
A total of 8,400 disks, each punched into a #7 shape, were molded into 4 blocks each. First, 2,100 sheets were inserted into a shaft with the same shape as the inner diameter, and then compressed and molded to a height of 376 m using a 15 ton press machine with iron plates on both ends, forming 4 pieces each. After removing the shaft, The above-mentioned compression-molded blocks 9 are placed on the iron core 8 (4 each)
Insert the roll and tighten both ends with nuts 10. Remove the iron plate to form a roll body, and then roll this roll to the specified outer diameter of 220 mm.
Finishing was performed to form an alkali-resistant roll with a width of 1500111 mm. In addition, as a comparative example, a silol was formed using a spunbond nonwoven fabric in the same manner as described above.

The rubber hardness t (J1B spring type aerometer) of the roll of the present invention was measured to be 80 to 8.
5°, whereas the spunbond roll of the comparative example was 9°.
It was very hard with an angle of 0 to 95 degrees, and was close to a synthetic resin roll with no elasticity or liquid retention.

In addition, when the liquid retention amount (weight increase rate after 10 minutes of immersion in water) of the base fiber sheet for an alkali-resistant roll of the present invention and the conventional spunbond nonwoven fabric constituting the roll was measured,
400≦ and 100%.The product of the present invention has excellent water absorption and liquid retention properties, and the drawing ratio during roll formation is greatly improved.

As described above, the present invention can construct an ideal roll with appropriate repulsion elasticity, water absorption, and liquid retention, and furthermore, the whitening phenomenon of the special nylon resin was confirmed in a long-term test in an alkali-resistant solution. This invention has various effects, such as the ability to obtain an innovative alkali-resistant roll with no change in repulsion, water absorption, or liquid retention properties.

[Brief explanation of the drawing]

Figure 1 (0) is an explanatory diagram of the composition of the polypropylene composite fiber containing the special boria yodo resin used in the present invention, Figure 1 (main)
2 is a cross-sectional view of the base fiber sheet for alkali-resistant rolls of the present invention, FIG. 2 is a cross-sectional view of the polypropylene composite fiber constituting the base fiber sheet for alkali-resistant rolls, and FIG. 5 is the base material for alkali-resistant rolls. An explanatory view showing the adhesion state of the polypropylene composite fibers and the PH-PP core-sheath composite fibers constituting the fiber sheet, and FIG. 4 is a perspective view of an alkali-resistant roll formed using the base fiber sheet for an open-base alkali roll. It is. 1... Base fiber sheet for alkali-resistant rolls 2... Polypropylene resin 3... Special polyamide shredded resin 4... Polypropylene composite fiber 5... SBR elastomer resin layer 6... Plf-PP core/sheath Type composite fiber 7...Keyway 8...Iron core 9...Block 10...Yo Natsuto Kiyoshi Hayashi 1. Tomo, Figure 1 (Inotsz Figure 1114fgJ IIM'3 Figure

Claims (1)

[Claims] Polypropylene conjugate fiber containing a special polyamide resin in which 10 to 50% of the hydrogen in ε-cabroctam has been replaced with dimethylamino groups (M-(OHs)m), and polyethylene-bolypropylene core-sheath type conjugate fiber. The mixed fiber web is temporarily bonded by needle punching, heat treatment, etc. to a fiber sheet, and then applied to a paper coater such as 8BR, NBRj tex, etc.4.
A base fiber sheet for an alkali-resistant roll, characterized in that it is integrally cross-linked by dipping treatment with a binder liquid containing a thermoplastic resin having end groups and a curing agent.