JPS6054950A - Fiber for cement reinforcement - 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 The present invention relates to reinforcing fibers for use in molded products.
2% relates to reinforcing fibers with excellent adhesion to cement molded products. Conventional technology Ceilings, walls,
Floor finishing and concrete slabs

[Cooks, cement tiles, pavement river stones, etc. are manufactured, but as is well known, cement molded products have poor bending strength, tensile strength, and impact strength, so in order to make effective use of these cement products, they must be reinforced with fibers, etc. things are being done. Asbestos is a typical reinforcing material for fibers, etc.
In recent years, steel fiber, glass twill fiber, polypropylene fiber, and polyamide fiber have been developed. Polyvinyl alcohol twill fibers and wholly aromatic polyamide fibers are used alone or in combination. When asbestos is used, the reinforcing effect is relatively large even when the addition rate is 15 to 35 inches, but asbestos is suspected to be a carcinogen and poses a sanitary problem. Glass fiber has low durability because it is corroded by the strong alkalinity characteristic of cement. Polypropylene fibers, polyamide fibers, polyvinyl alcohol fibers, and the like do not have sufficient adhesion to the cement matrix, so their reinforcing effect is small. Characteristics of cement reinforcing fibers: 19 High Young's modulus, high strength, and high interfacial bonding strength with cement as mud socks. Fully aromatic polyamide complexes are conventionally used reinforcing fibers, and fully aromatic polyamide fibers have high Young's modulus,
Although these fibers have high strength, they also have a low cement reinforcing effect due to their low interfacial bonding strength with cement. Purpose of the Invention The present invention was made against the background of the above-mentioned circumstances, and its purpose is to provide fibers for reinforcing cement that have improved adhesiveness (interfacial bonding strength) to cement. The structure of the invention, that is, the present invention has [CI] fine irregularities on the fiber surface, limb fine irregularities-1
= K Gold, Copper, 14M, Nickel, Konolt. Cement reinforcing fiber (2) having a coating layer made of a metal on Iυ selected from the group consisting of balanrum and tin; Claims @ 7 of item 411 in which the fine irregularities consist mainly of an inorganic compound capable of forming water-use glues. Complex for reinforcing metal (31 metal is nickel) Claim No. (1)
4J/I fibers for reinforcing cement 1 as described in item (2) (41 fibers are aromatic polyamide 1) The fine irregularities on the W surface of the NII fibers may be in any form. 1. Any conventionally known method may be used to form fine irregularities on the fiber surface. For example, treatment with chemicals. Alternatively, a specific compound may be applied to the fiber surface and then solidified to form fine irregularities.Alternatively, gold, scissors, m, nickel, or cobalt may be used. Metals or non-metals that have a high affinity with palladium, tin, etc. may be nonuniformly applied to the fiber surface.Vapor deposition, adhesion, and other known methods may be used as the application method.Next, it is formed on the fiber surface. - A coating layer made of one or more metals selected from the group consisting of gold, silver, copper, nickel, cobalt, and tin is formed on the deposited fine irregularities.Metal vapor deposition is a method for forming the coating layer. , metal plating method, chemical plating method, etc. The fibers used in the present invention are not particularly limited, but any fibers that have been used for reinforcing cement can be used. 5- For example, asbestos, steel Fibers made of fibers, glass fibres, polyvinyl alcohol fibers, polyamide fibers, polyvinyl alcohol fibers, 7-lamid fibers, or a combination of these can be used, but they have a high Young's modulus, high strength, and alkali resistance. It is preferable to use 7-lamid fiber as a fiber that has the following repeating units (%).
The aromatic polyamide fibers (6) consisting of 1) to (4) have particularly excellent alkali resistance among the aramid 1' fibers, and therefore are the most preferred fibers for use in the present invention. R,R. 0〇 6- [In the formula, Ar + l Ar, + Ar, may be the same or different”), and is an aromatic carbocyclic residue in which the bonding chains extend in the same or parallel axes. Maximum spacing Represents aromatic heterocyclic residues that must be bonded through ring atoms representing and combinations thereof.Ar4.Ar11 may be the same or different, and are a paraphenylene group.Selected from a metaphenylene group. ] Repeating unit The relationship between the number of moles of is essentially (1)+!21-
When 1131-+141=100 morti (3)
is 0 to 90 molar'fi++41 is a #l fine consisting of a polymer having a content of 5 to 50 molar, preferably 10 to 30 molar. Aromatic carbocyclic residues with bonded chains extending in the coaxial direction mean, for example, 1,4-phenylene, 1,4-naphthylene, etc., and aromatic carbocyclic residues with bonded chains extending in the parallel axis direction Examples of residues include 1,5-naphthylene, 2,
It means 6-naphthylene, etc. Examples of alkyl groups with 5 or less carbon atoms include methyl and ethyl groups! Examples include furoyl group, notyl group, pentyl group, and methyl group is preferred. A substituent may be bonded to the carbon atom of the above aromatic carbocyclic residue and aromatic heterocyclic residue. Such substituents include p-gene groups (e.g. chlorine, bromine, fluorine), lower alkyl groups (e.g. methyl, ethyl, isopropyl, n-propyl groups), low-g
Alu 1-? Shi group (methoxy, ethoxy group),
Examples include a cyano group, an acetyl group, and a nido group, with chlorine and methyl groups being preferred. As a result of the construction as described in detail, the cement molded product reinforced with 1# fiber for cement reinforcement of the present invention has the following effects:
The bending strength and tensile strength are far superior to conventional products, and especially when the specific fully aromatic polyamide fiber (4) described in detail is used, the durability is even more excellent. EXAMPLES Hereinafter, the present invention will be specifically explained using examples. Example 1 25 molt of rose phenylene diamine, terephthalic acid p
A copolymer obtained by copolycondensing 150 mol% of lye and 25 mol% of 3,4'-diaminodiphenyl ether was wet-spun in a conventional manner, and then the spun yarn (undrawn yarn) was mixed with hydrated silicic acid. It was immersed in an aqueous dispersion of aluminum, then dried, and then stretched at a temperature of 500°C and a stretching ratio of 10 times.
To obtain fully aromatic polyamide fibers Q of 500 denier and 1000 filaments, the fibers were mixed with 10 I stannous chloride and 2 o C hydrochloric acid according to a conventionally widely known method.
c. 5 at room temperature in a sensitizing treatment solution consisting of 1000cc of water.
The sample was immersed for 3 minutes to sensitize it. After washing it with water and drying it (
19. Palladium chloride (10 minutes at 105°C) Hydrochloric acid 5c
c. Activation treatment by immersing in an activation treatment solution consisting of 1000 cc of water at room temperature for 2 minutes, washing unreacted palladium chloride with water and drying at 105°C for 10 minutes), nickel sulfate/l
-801! + Cyclized ammonium 40! I, Sodium acetate】O
g1 Sodium hypophosphite 40g, water 10g (l fl c
c J, immersed in Rinaru electroless coating solution at 35℃ for 3 minutes, electroless nickel plating, washed with water, 10
Dry the tiger for 15 min at 5 °C. The first wholly aromatic polyamide fiber (A) obtained had a very uniform nickel coating layer and was then mixed with Portland cement (Mitsubishi Mining Cement 413) 200 to 91 using a forced squeeze mixer. Particle size 3
Fine stone material (river sand) - 11'10kg and particle size 30
After mixing 400 yu of the following coarse aggregate (crushed stone), 100 to 9 water and a water reducing agent (+l Zoris Bussan Sou, skg) were added and stirred uniformly. Fully aromatic PA! Liamide gauze # (mouth) (cut length 1
2 fl) was gradually added to the 10-ml solution until the volume ratio reached 2.0%, and kneading was continued until the mixture was uniformly mixed. Bending test specimen (prismatic 10
6B>' 10 an . I left it in a banquet atmosphere at 65 RH for 7 days. The bending strength and tensile strength of the obtained specimen were each 7
Measured Lfc using a Musler bending tester and an Instron tensile tester. The evaluation results are shown in Table 1. Note that the comparative example is a case where an experiment was conducted under exactly the same conditions as the present invention except that there was no fiber reinforcement. Table 1 11-

Claims (1)

[Claims] +11 A fiber surface having fine irregularities, and a coating layer made of one or more metals selected from the group consisting of gold, silver, copper, nickel, cobalt, palladium, and tin on the fine irregularities. (2) A fiber for cement reinforcement according to claim 1, in which the fine irregularities are mainly composed of an inorganic compound capable of forming a water-use glue. Range No. 1
1,! Cement reinforcing fiber (4) according to J or 2. The cement reinforcing fiber according to any one of claims 1 to 31, wherein the fiber is an aromatic polyamide.