JPH04245912A - Production of fiber for reinforcing cement - Google Patents
Production of fiber for reinforcing cementInfo
- Publication number
- JPH04245912A JPH04245912A JP913491A JP913491A JPH04245912A JP H04245912 A JPH04245912 A JP H04245912A JP 913491 A JP913491 A JP 913491A JP 913491 A JP913491 A JP 913491A JP H04245912 A JPH04245912 A JP H04245912A
- Authority
- JP
- Japan
- Prior art keywords
- spinning
- cement
- fibers
- fiber
- weight
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 239000000835 fiber Substances 0.000 title claims abstract description 48
- 239000004568 cement Substances 0.000 title claims abstract description 41
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 8
- 230000003014 reinforcing effect Effects 0.000 title description 10
- 238000009987 spinning Methods 0.000 claims abstract description 30
- ZMXDDKWLCZADIW-UHFFFAOYSA-N N,N-Dimethylformamide Chemical compound CN(C)C=O ZMXDDKWLCZADIW-UHFFFAOYSA-N 0.000 claims abstract description 27
- 229920002239 polyacrylonitrile Polymers 0.000 claims abstract description 17
- FXHOOIRPVKKKFG-UHFFFAOYSA-N N,N-Dimethylacetamide Chemical compound CN(C)C(C)=O FXHOOIRPVKKKFG-UHFFFAOYSA-N 0.000 claims abstract description 11
- 229920000642 polymer Polymers 0.000 claims abstract description 11
- 238000002166 wet spinning Methods 0.000 claims abstract description 5
- 238000000605 extraction Methods 0.000 claims abstract description 3
- 238000000034 method Methods 0.000 claims description 15
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 12
- NLHHRLWOUZZQLW-UHFFFAOYSA-N Acrylonitrile Chemical group C=CC#N NLHHRLWOUZZQLW-UHFFFAOYSA-N 0.000 claims description 10
- 239000011550 stock solution Substances 0.000 claims description 6
- 230000015271 coagulation Effects 0.000 claims description 3
- 238000005345 coagulation Methods 0.000 claims description 3
- IYWCBYFJFZCCGV-UHFFFAOYSA-N formamide;hydrate Chemical compound O.NC=O IYWCBYFJFZCCGV-UHFFFAOYSA-N 0.000 claims description 2
- 230000002787 reinforcement Effects 0.000 claims 1
- 239000003513 alkali Substances 0.000 abstract description 10
- 229920002972 Acrylic fiber Polymers 0.000 abstract description 9
- 239000012783 reinforcing fiber Substances 0.000 abstract description 8
- 230000001112 coagulating effect Effects 0.000 abstract 1
- 239000002002 slurry Substances 0.000 description 9
- 239000000178 monomer Substances 0.000 description 7
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 description 6
- CERQOIWHTDAKMF-UHFFFAOYSA-M Methacrylate Chemical compound CC(=C)C([O-])=O CERQOIWHTDAKMF-UHFFFAOYSA-M 0.000 description 5
- 230000007423 decrease Effects 0.000 description 5
- IAZDPXIOMUYVGZ-UHFFFAOYSA-N Dimethylsulphoxide Chemical compound CS(C)=O IAZDPXIOMUYVGZ-UHFFFAOYSA-N 0.000 description 4
- 238000004898 kneading Methods 0.000 description 4
- 239000003960 organic solvent Substances 0.000 description 4
- 229920000271 Kevlar® Polymers 0.000 description 3
- 239000004761 kevlar Substances 0.000 description 3
- OMIGHNLMNHATMP-UHFFFAOYSA-N 2-hydroxyethyl prop-2-enoate Chemical compound OCCOC(=O)C=C OMIGHNLMNHATMP-UHFFFAOYSA-N 0.000 description 2
- YEJRWHAVMIAJKC-UHFFFAOYSA-N 4-Butyrolactone Chemical compound O=C1CCCO1 YEJRWHAVMIAJKC-UHFFFAOYSA-N 0.000 description 2
- BAPJBEWLBFYGME-UHFFFAOYSA-N Methyl acrylate Chemical compound COC(=O)C=C BAPJBEWLBFYGME-UHFFFAOYSA-N 0.000 description 2
- 239000010425 asbestos Substances 0.000 description 2
- 238000005452 bending Methods 0.000 description 2
- 238000009835 boiling Methods 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- -1 hydroxyalkyl acrylate Chemical compound 0.000 description 2
- 229910052895 riebeckite Inorganic materials 0.000 description 2
- 239000010454 slate Substances 0.000 description 2
- 238000010558 suspension polymerization method Methods 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 238000005406 washing Methods 0.000 description 2
- OEPOKWHJYJXUGD-UHFFFAOYSA-N 2-(3-phenylmethoxyphenyl)-1,3-thiazole-4-carbaldehyde Chemical compound O=CC1=CSC(C=2C=C(OCC=3C=CC=CC=3)C=CC=2)=N1 OEPOKWHJYJXUGD-UHFFFAOYSA-N 0.000 description 1
- GOXQRTZXKQZDDN-UHFFFAOYSA-N 2-Ethylhexyl acrylate Chemical compound CCCCC(CC)COC(=O)C=C GOXQRTZXKQZDDN-UHFFFAOYSA-N 0.000 description 1
- OYUNTGBISCIYPW-UHFFFAOYSA-N 2-chloroprop-2-enenitrile Chemical compound ClC(=C)C#N OYUNTGBISCIYPW-UHFFFAOYSA-N 0.000 description 1
- CFVWNXQPGQOHRJ-UHFFFAOYSA-N 2-methylpropyl prop-2-enoate Chemical compound CC(C)COC(=O)C=C CFVWNXQPGQOHRJ-UHFFFAOYSA-N 0.000 description 1
- 206010007269 Carcinogenicity Diseases 0.000 description 1
- JIGUQPWFLRLWPJ-UHFFFAOYSA-N Ethyl acrylate Chemical compound CCOC(=O)C=C JIGUQPWFLRLWPJ-UHFFFAOYSA-N 0.000 description 1
- CERQOIWHTDAKMF-UHFFFAOYSA-N Methacrylic acid Chemical compound CC(=C)C(O)=O CERQOIWHTDAKMF-UHFFFAOYSA-N 0.000 description 1
- XTXRWKRVRITETP-UHFFFAOYSA-N Vinyl acetate Chemical compound CC(=O)OC=C XTXRWKRVRITETP-UHFFFAOYSA-N 0.000 description 1
- BZHJMEDXRYGGRV-UHFFFAOYSA-N Vinyl chloride Chemical compound ClC=C BZHJMEDXRYGGRV-UHFFFAOYSA-N 0.000 description 1
- INLLPKCGLOXCIV-UHFFFAOYSA-N bromoethene Chemical compound BrC=C INLLPKCGLOXCIV-UHFFFAOYSA-N 0.000 description 1
- CQEYYJKEWSMYFG-UHFFFAOYSA-N butyl acrylate Chemical compound CCCCOC(=O)C=C CQEYYJKEWSMYFG-UHFFFAOYSA-N 0.000 description 1
- 230000007670 carcinogenicity Effects 0.000 description 1
- 231100000260 carcinogenicity Toxicity 0.000 description 1
- 238000003776 cleavage reaction Methods 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 238000009833 condensation Methods 0.000 description 1
- 230000005494 condensation Effects 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- BXKDSDJJOVIHMX-UHFFFAOYSA-N edrophonium chloride Chemical compound [Cl-].CC[N+](C)(C)C1=CC=CC(O)=C1 BXKDSDJJOVIHMX-UHFFFAOYSA-N 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 239000003999 initiator Substances 0.000 description 1
- 239000011259 mixed solution Substances 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000004533 oil dispersion Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- PNJWIWWMYCMZRO-UHFFFAOYSA-N pent‐4‐en‐2‐one Natural products CC(=O)CC=C PNJWIWWMYCMZRO-UHFFFAOYSA-N 0.000 description 1
- 238000013001 point bending Methods 0.000 description 1
- 239000012779 reinforcing material Substances 0.000 description 1
- 239000013557 residual solvent Substances 0.000 description 1
- 230000007017 scission Effects 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- ISXSCDLOGDJUNJ-UHFFFAOYSA-N tert-butyl prop-2-enoate Chemical compound CC(C)(C)OC(=O)C=C ISXSCDLOGDJUNJ-UHFFFAOYSA-N 0.000 description 1
Landscapes
- Artificial Filaments (AREA)
Abstract
Description
【0001】0001
【産業上の利用分野】本発明は、セメント補強用として
、セメントに対する接着性ならびに機械的補強効果の極
めて優れた補強繊維の製法に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing reinforcing fibers for reinforcing cement, which have excellent adhesion to cement and mechanical reinforcing effects.
【0002】0002
【従来の技術】セメント製品の強度を向上させるために
、補強材を添加する方法は種々知られており、たとえば
、耐アルカリガラスを使用する方法やアスベストを使用
する方法が知られている。しかし耐アルカリガラス補強
セメント製品は耐衝撃力を強く求められる用途には使い
にくく、また、アスベスト補強セメント製品はアスベス
トによる発ガン性が指摘されるようになってから、使用
が制限されるようになっている。BACKGROUND OF THE INVENTION Various methods are known for adding reinforcing materials to improve the strength of cement products. For example, methods using alkali-resistant glass and methods using asbestos are known. However, alkali-resistant glass-reinforced cement products are difficult to use in applications that require strong impact resistance, and asbestos-reinforced cement products have been restricted in use since the carcinogenicity of asbestos has been pointed out. It has become.
【0003】そこで汎用繊維を用いてセメント製品を補
強することが種々検討され始めている。その場合セメン
ト補強用繊維として最も重要なのは、耐アルカリ性とセ
メントとの親和性、更にセメントとの混練中に補強繊維
がフィブリル化することが必要である。[0003] Therefore, various studies have begun to consider reinforcing cement products using general-purpose fibers. In this case, the most important requirements for cement reinforcing fibers are alkali resistance and compatibility with cement, as well as the ability of the reinforcing fibers to fibrillate during kneading with cement.
【0004】たとえば高強力繊維として知られているデ
ュポン社のケブラー(登録商標)は、機械的特性はすぐ
れているものの縮合系ポリマーを用いているために、耐
アルカリ性が低くまたセメントとの接着性が悪い。した
がってケブラーをセメント補強繊維として使用する場合
には表面処理を施したケブラーを使用する必要がある(
特開昭63−55142号公報)。For example, DuPont's Kevlar (registered trademark), which is known as a high-strength fiber, has excellent mechanical properties, but because it uses a condensation polymer, it has low alkali resistance and poor adhesion to cement. It's bad. Therefore, when using Kevlar as cement reinforcing fiber, it is necessary to use surface-treated Kevlar (
(Japanese Patent Application Laid-Open No. 63-55142).
【0005】機械的特性、耐アルカリ性、セメントとの
接着性の三つの要件をほぼ満足する繊維として、アクリ
ロニトリル系繊維が注目されているが、通常のアクリル
繊維では機械的強度が低いために十分な効果を挙げるこ
とはできない。Acrylonitrile fibers are attracting attention as fibers that almost satisfy the three requirements of mechanical properties, alkali resistance, and cement adhesion, but ordinary acrylic fibers have low mechanical strength and do not have sufficient strength. I can't say it's effective.
【0006】高分子量のアクリロニトリル系重合体を用
い、その機械的強度を向上させたアクリル系繊維を使用
してセメントの補強をすることが提案されている(特開
昭61−6160号、同61−6161号、同61−1
63149号、同61−163151号各公報等)が、
いずれの繊維もセメントとの混練中でのフィブリル化が
不十分であり、満足できる補強効果をあげることはでき
ない。[0006] It has been proposed to reinforce cement using acrylic fibers made of high molecular weight acrylonitrile polymer with improved mechanical strength (Japanese Patent Laid-Open Nos. 61-6160 and 61-61). -6161, 61-1
63149, 61-163151, etc.)
All of the fibers are insufficiently fibrillated during kneading with cement, and cannot provide a satisfactory reinforcing effect.
【0007】[0007]
【発明が解決しようとする課題】本発明者らは鋭意研究
した結果耐アルカリ性、セメントとの親和性が良好でか
つセメントとの混練中に容易にフィブリル化して、セメ
ント中に均一に分散しやすいアクリル繊維の製法を見出
し本発明を完成した。[Problems to be Solved by the Invention] As a result of intensive research by the present inventors, the product has good alkali resistance and affinity with cement, and easily fibrillates during kneading with cement, making it easy to disperse uniformly in cement. He discovered a method for producing acrylic fibers and completed the present invention.
【0008】[0008]
【課題を解決するための手段】本発明の要旨とするとこ
ろは、80重量%以上のアクリロニトリル単位を含有す
る重量平均分子量40万以上のアクリロニトリル系重合
体をジメチルホルムアミド又はジメチルアセトアミドに
溶解して得られる重合体濃度が3〜8%の紡糸原液を湿
式紡糸法で紡糸し水とジメチルホルムアミド又はジメチ
ルアセトアミドからなる凝固浴で凝固し、得られた凝固
糸を延伸して単繊維繊度が0.05d以下かつ紡糸油剤
の抽出量が繊維重量の0.5〜1%の範囲にあるセメン
ト補強用繊維集合体の製法にある。[Means for Solving the Problems] The gist of the present invention is to obtain an acrylonitrile polymer containing 80% by weight or more of acrylonitrile units and having a weight average molecular weight of 400,000 or more, dissolved in dimethylformamide or dimethylacetamide. A spinning dope with a polymer concentration of 3 to 8% is spun using a wet spinning method, coagulated in a coagulation bath consisting of water and dimethylformamide or dimethylacetamide, and the resulting coagulated yarn is drawn to a single fiber fineness of 0.05 d. The present invention provides a method for producing a fiber aggregate for reinforcing cement, in which the extraction amount of the spinning oil is in the range of 0.5 to 1% of the weight of the fibers.
【0009】本発明で用いるアクリロニトリル系重合体
は、アクリロニトリル単位を80重量%以上含有し、し
かも重量平均分子量が40万以上であることが必要であ
る。用いるアクリロニトリル系重合体中に含有されるア
クリロニトリルが80重量%未満の場合には、セメント
中のアルカリと反応し易い単量体が多量に繊維中に存在
するため、重合体主鎖の切断がおこりやすくなり、また
重合体主鎖を繊維軸方向に配向させてもアクリロニトリ
ル以外の単量体ユニットの部分で配向構造に乱れが発生
し、その部分よりセメントスラリー中の水分やアルカリ
等が繊維中に拡散し易くなるため、セメントを養生する
際にアクリロニトリル系重合体中のCN基の加水分解が
発生し補強繊維の役目をはたせなくなる。The acrylonitrile polymer used in the present invention must contain 80% by weight or more of acrylonitrile units and have a weight average molecular weight of 400,000 or more. If the acrylonitrile content in the acrylonitrile polymer used is less than 80% by weight, a large amount of monomers that easily react with the alkali in cement are present in the fibers, resulting in cleavage of the polymer main chain. Furthermore, even if the polymer main chain is oriented in the fiber axis direction, the orientation structure will be disturbed in the monomer unit part other than acrylonitrile, and water and alkali in the cement slurry will enter the fiber from that part. Since it becomes easy to diffuse, the CN group in the acrylonitrile polymer will be hydrolyzed during cement curing, and it will no longer function as a reinforcing fiber.
【0010】ここでアクリロニトリルと共重合してして
用いることのできる単量体としては、例えばメタクリル
酸、メチルアクリレート又はメタクリレート、エチルア
クリレート又はメタクリレート、n−、イソ−又はt−
ブチルアクリレート又はメタクリレート、2−エチルヘ
キシルアクリレート又はメタクリレート、α−クロロア
クリロニトリル、2−ヒドロキシエチルアクリレート、
ヒドロキシエチルアクリレート、ヒドロキシアルキルア
クリレート又はメタクリレート、塩化ビニル、塩化ビニ
リデン、臭化ビニル、酢酸ビニル等の不飽和単量体が挙
げられるがアクリロニトリルと共重合させうる単量体な
らいずれの単量体でもよく、2種以上の単量体を併用す
ることもできる。Examples of monomers that can be copolymerized with acrylonitrile include methacrylic acid, methyl acrylate or methacrylate, ethyl acrylate or methacrylate, n-, iso- or t-
Butyl acrylate or methacrylate, 2-ethylhexyl acrylate or methacrylate, α-chloroacrylonitrile, 2-hydroxyethyl acrylate,
Examples include unsaturated monomers such as hydroxyethyl acrylate, hydroxyalkyl acrylate or methacrylate, vinyl chloride, vinylidene chloride, vinyl bromide, and vinyl acetate, but any monomer that can be copolymerized with acrylonitrile may be used. , two or more types of monomers can also be used in combination.
【0011】更に用いるアクリロニトリル系重合体の重
量平均分子量は40万以上であることが必要である。重
量平均分子量が40万未満の重合体を用いた場合には、
紡糸工程で延伸を施してもセメントスラリー中の水やア
ルカリ等の繊維中への拡散を抑制できるほど重合体分子
を配向させることはできない。Furthermore, it is necessary that the weight average molecular weight of the acrylonitrile polymer used is 400,000 or more. When using a polymer with a weight average molecular weight of less than 400,000,
Even if stretching is performed in the spinning process, it is not possible to orient the polymer molecules to the extent that the diffusion of water, alkali, etc. in the cement slurry into the fibers can be suppressed.
【0012】本発明で用いるアクリロニトリル系重合体
の製造方法としては、特に限定されるものではないが、
例えば特開昭61−111310号公報に記載の方法、
すなわちアクリロニトリル10〜70重量%、有機溶剤
15〜60重量%及び水15〜60重量%の混合物を用
い、ラジカル開始剤の存在下で重合させた後、水又は有
機溶剤を単量体1重量部に対し1〜10重量部添加して
重合させる方法が、繊維賦形に適した高分子量のアクリ
ロニトリル系重合体を安定にしかも効率よく製造できる
という点で好ましい。この方法で用いられる有機溶剤と
してはジメチルホルムアミド(DMF)、ジメチルアセ
トアミド(DMAc)、γ−ブチロラクトン、ジメチル
スルホキシド(DMSO)等が挙げられる。[0012] The method for producing the acrylonitrile polymer used in the present invention is not particularly limited;
For example, the method described in JP-A-61-111310,
That is, a mixture of 10 to 70% by weight of acrylonitrile, 15 to 60% by weight of an organic solvent, and 15 to 60% by weight of water is polymerized in the presence of a radical initiator, and then 1 part by weight of water or organic solvent is added to the monomer. A method in which 1 to 10 parts by weight of the acrylonitrile polymer is added and polymerized is preferred because it allows stable and efficient production of a high molecular weight acrylonitrile polymer suitable for fiber shaping. Examples of the organic solvent used in this method include dimethylformamide (DMF), dimethylacetamide (DMAc), γ-butyrolactone, and dimethylsulfoxide (DMSO).
【0013】本発明の単繊維繊度が0.05d以下のア
クリル繊維を製造するためには、紡糸原液中のアクリロ
ニトリル系重合体濃度を下げるとともに、紡糸ノズルか
らの紡糸原液の吐出線速度と未延伸糸の速度の比(紡糸
ドラフト)をできるだけ高くする必要がある。In order to produce the acrylic fiber of the present invention with a single fiber fineness of 0.05d or less, it is necessary to lower the acrylonitrile polymer concentration in the spinning dope, and to adjust the linear velocity of the spinning dope from the spinning nozzle and the unstretched It is necessary to make the yarn speed ratio (spinning draft) as high as possible.
【0014】したがって紡糸原液中のアクリロニトリル
系重合体の濃度は3〜8%の範囲に設定するのが必要で
あるが、用いる重合体の重量平均分子量が40万未満の
場合には、このような低濃度の紡糸原液を調製しても、
その粘度が低くなり、曳糸性が低下して安定に紡糸を続
けることは困難となる。また、紡糸原液中のアクリロニ
トリル系重合体の濃度が8%を越える場合には、紡糸ド
ラフトが高くなり、紡糸安定性が低下する。一方アクリ
ロニトリル系重合体の濃度が3%未満の場合には、紡糸
原液の粘度が低下するためやはり紡糸安定性が低下する
。[0014] Therefore, it is necessary to set the concentration of the acrylonitrile polymer in the spinning dope in the range of 3 to 8%, but when the weight average molecular weight of the polymer used is less than 400,000, such Even if a spinning stock solution with a low concentration is prepared,
The viscosity decreases, and the spinnability decreases, making it difficult to continue spinning stably. Furthermore, if the concentration of the acrylonitrile polymer in the spinning stock solution exceeds 8%, the spinning draft becomes high and the spinning stability decreases. On the other hand, if the concentration of the acrylonitrile polymer is less than 3%, the viscosity of the spinning stock solution decreases, resulting in a decrease in spinning stability.
【0015】続いてこのような紡糸原液を目開きが10
μ以下の濾材で濾過し紡糸ノズルから吐出する。紡糸ノ
ズルの孔径は小さいほど好ましく50μ以下、より好ま
しくは40μ以下である。紡糸方式は湿式紡糸法により
紡糸ノズルから吐出させ、ジメチルホルムアミド又はジ
メチルアセトアミドと水の混合液を用いる。[0015] Next, such a spinning dope was prepared with a mesh opening of 10.
It is filtered through a filter medium of μ or less and discharged from a spinning nozzle. The smaller the hole diameter of the spinning nozzle is, the more preferably it is 50 μm or less, and more preferably 40 μm or less. The spinning method uses a mixed solution of dimethylformamide or dimethylacetamide and water, which is discharged from a spinning nozzle by a wet spinning method.
【0016】得られた凝固糸は続いて残留した溶媒を洗
浄除去しながら延伸を施す。延伸方法としては、沸水中
での延伸もしくは後工程になるほど高温になるように温
度勾配をつけた温水中で、凝固糸に含有する有機溶剤を
洗浄しながら延伸を行う。[0016] The obtained coagulated thread is then stretched while washing and removing the residual solvent. As for the stretching method, the stretching is carried out in boiling water or in warm water with a temperature gradient such that the temperature becomes higher in subsequent steps, while washing the organic solvent contained in the coagulated yarn.
【0017】その後、得られるセメント補強用繊維の抽
出油分が繊維当り0.5〜1%となる様に紡糸油剤の分
散液を付与する。得られる繊維の抽出油分の量がこの範
囲にあるとき、単繊維が適度に接着した繊維集合体とす
ることができる。Thereafter, a dispersion of a spinning oil agent is applied so that the extracted oil content of the resulting cement reinforcing fibers is 0.5 to 1% per fiber. When the amount of extracted oil in the resulting fibers is within this range, a fiber aggregate in which single fibers are appropriately bonded can be obtained.
【0018】抽出油分の量を0.5%未満にしようとし
た場合には、油剤付与工程以降の通過性が低下する。一
方繊維の抽出油分の量が1%を越える場合には、得られ
た繊維集合体中の単繊維どうしの接着が少ないため、セ
メントの混練中にファイバーボールを形成しやすいため
好ましくない。[0018] If it is attempted to reduce the amount of extracted oil to less than 0.5%, the passability after the oiling step will be reduced. On the other hand, if the amount of oil extracted from the fibers exceeds 1%, this is not preferable because the adhesion between the single fibers in the resulting fiber aggregate is low and fiber balls are likely to form during cement kneading.
【0019】続いて繊維に油剤の分散液を付与した後乾
燥しその後乾熱延伸を行う。乾熱延伸の方法としては、
熱ロール、熱板、熱ピンまたは加熱チューブ等いずれの
方法でも可能である。Subsequently, an oil dispersion is applied to the fibers and then dried, followed by dry heat stretching. The dry heat stretching method is as follows:
Any method such as a heat roll, a heat plate, a heat pin or a heat tube can be used.
【0020】このようにして得られるアクリロニトリル
系繊維は、単繊維繊度が0.05d以下の繊維が接着し
ているため、セメントスラリー中に添加した場合、セメ
ントとの混合中にセメント粒子との摩擦によって接着し
た単繊維が少しずつほぐれセメントスラリー中に均一に
分散させることができ、その結果セメント製品の補強を
効果的に行うことが可能となる。[0020] Since the acrylonitrile fibers obtained in this way have fibers with a single fiber fineness of 0.05d or less attached, when added to cement slurry, friction with cement particles occurs during mixing with cement. The bonded single fibers can be loosened little by little and uniformly dispersed in the cement slurry, and as a result, cement products can be effectively reinforced.
【0021】本発明の繊維を用いてセメント製品の補強
を行うためには、以上で説明したアクリル系繊維をカッ
トしてセメントスラリーに添加しその後成形、養生する
必要がある。カット長としては、繊維長をL、繊維直径
をD(D:繊維断面を真円と仮定した場合の繊維直径)
としたとき、L/Dが500〜5000の範囲が好まし
い。L/Dが500未満のときは補強効果が発現できな
いし、5000を越えるときはセメントスラリー中で繊
維がもつれてしまいやはり補強効果が小さい。In order to reinforce cement products using the fibers of the present invention, it is necessary to cut the acrylic fibers described above, add them to cement slurry, and then mold and cure them. As for the cut length, the fiber length is L, and the fiber diameter is D (D: fiber diameter when the fiber cross section is assumed to be a perfect circle).
When, L/D is preferably in the range of 500 to 5000. When L/D is less than 500, the reinforcing effect cannot be exhibited, and when it exceeds 5000, the fibers become entangled in the cement slurry, resulting in a small reinforcing effect.
【0022】また、セメントスラリー中への添加量は対
セメント重量%で0.1〜3%が好ましい。添加量が0
.1%未満では補強繊維の量が少なく、補強効果が極め
て小さくなるし3%を越えるとセメントスラリー中での
繊維の分散性が悪くなり繊維が集合してファイバーボー
ル状となって均一な補強効果が得られない。The amount added to the cement slurry is preferably 0.1 to 3% by weight based on the cement. Added amount is 0
.. If it is less than 1%, the amount of reinforcing fibers will be small and the reinforcing effect will be extremely small. If it exceeds 3%, the dispersibility of the fibers in the cement slurry will be poor and the fibers will aggregate into fiber balls, resulting in a uniform reinforcing effect. is not obtained.
【0023】[0023]
【実施例】以下実施例によって本発明を具体的に説明す
る。
1.「重量平均分子量(Mw)」はDMFを溶媒として
25℃で「η」を測定して「η」=3.35×10−4
(Mw)0.72から算出した。[Examples] The present invention will be specifically explained below using Examples. 1. "Weight average molecular weight (Mw)" is determined by measuring "η" at 25°C using DMF as a solvent, and "η" = 3.35 x 10-4.
Calculated from (Mw) 0.72.
【0024】2.「セメント製品の曲げ強度」は長さ1
5cm、巾5cmの試験片を大型テンシロン万能試験機
UTM−25T(東洋ボールドウイン社製)を用い3点
曲げ強度(δb)を測定した。2. "Bending strength of cement products" is length 1
The three-point bending strength (δb) of a test piece measuring 5 cm and width 5 cm was measured using a large tensilon universal testing machine UTM-25T (manufactured by Toyo Baldwin Co., Ltd.).
【数1】[Math 1]
【0025】3.繊維の抽出油分の測定は、メタノール
を用いて繊維よりメタノール可溶分を抽出した後、メタ
ノール溶液を乾固させた後残渣の量を抽出油分とした。3. The extracted oil content of the fibers was measured by extracting methanol-soluble content from the fibers using methanol, drying the methanol solution, and determining the amount of the residue as the extracted oil content.
【0026】実施例1
懸濁重合法で得た重量平均分子量45万のアクリロニト
リル系重合体(AN単位100%)をDMAcに溶解し
、重合体濃度6%の紡糸原液(30ポイズ/45℃)を
得、孔径30μのノズル(ホール数50,000)より
、湿式紡糸法にて紡出し、DMAc/水 30/70
(重量比)、55℃の凝固浴にて凝固した。Example 1 An acrylonitrile polymer (100% AN units) with a weight average molecular weight of 450,000 obtained by a suspension polymerization method was dissolved in DMAc, and a spinning stock solution with a polymer concentration of 6% (30 poise/45°C) was prepared. was obtained and spun using a wet spinning method using a nozzle with a hole diameter of 30μ (number of holes: 50,000), and DMAc/water 30/70
(weight ratio), and coagulated in a coagulation bath at 55°C.
【0027】得られた未延伸糸を沸水中で3倍延伸を行
い油浴濃度を変えて油剤を付与し、熱ローラーで乾燥を
行い最後に200℃の熱ローラーで加熱し2倍の延伸を
施し、単繊維繊度0.05d、トウ繊度2500dの繊
維集合体を得た。更に、同様にして単繊維繊度の異なる
サンプルを得た。結果を表1に示した。The obtained undrawn yarn was stretched 3 times in boiling water, an oil agent was applied by varying the oil bath concentration, dried with a heated roller, and finally heated with a heated roller at 200°C to be stretched 2 times. A fiber aggregate having a single fiber fineness of 0.05 d and a tow fineness of 2500 d was obtained. Furthermore, samples with different single fiber finenesses were obtained in the same manner. The results are shown in Table 1.
【0028】[0028]
【表1】[Table 1]
【0029】比較例
懸濁重合法で得た重量平均分子量30万のアクリロニト
リル系重合体(AN単位100%)をジメチルアセトア
ミドに溶解し、重合体濃度を変えて紡糸原液を調製した
。その後、実施例1と同様の紡糸条件にて紡糸実験を行
った。結果を表2に示した。Comparative Example An acrylonitrile polymer (100% AN units) having a weight average molecular weight of 300,000 obtained by a suspension polymerization method was dissolved in dimethylacetamide, and spinning stock solutions were prepared by varying the polymer concentration. Thereafter, a spinning experiment was conducted under the same spinning conditions as in Example 1. The results are shown in Table 2.
【0030】[0030]
【表2】[Table 2]
【0031】実施例2
実施例1で得られたアクリル繊維をカッターを用い繊維
長2mmに定長カットしアクリル短繊維を得た。一方、
アクリル短繊維4部、パルプ4部、水800部をミキサ
ーを用い均一に混合しその後セメントを200部添加し
再び均一に混合した。このようにして得られたセメント
スラリーを濾紙を用いて濾過して成型した後、15日間
、25℃にて養生を行いスレート板を得た。得られたス
レート板の曲げ強力を測定し、表3の結果を得た。Example 2 The acrylic fiber obtained in Example 1 was cut to a fixed length of 2 mm using a cutter to obtain short acrylic fibers. on the other hand,
4 parts of short acrylic fibers, 4 parts of pulp, and 800 parts of water were uniformly mixed using a mixer, and then 200 parts of cement was added and mixed uniformly again. The thus obtained cement slurry was filtered using filter paper and molded, and then cured at 25° C. for 15 days to obtain a slate board. The bending strength of the obtained slate plate was measured, and the results shown in Table 3 were obtained.
【0032】[0032]
【表3】[Table 3]
Claims (1)
位を有する重量平均分子量40万以上のアクリロニトリ
ル系重合体をジメチルホルムアミド又はジメチルアセト
アミドに溶解して得られる重合体濃度3〜8%の紡糸原
液を、湿式紡糸法で紡糸し、水とジメチルホルムアミド
又はジメチルアセトアミドからなる凝固浴で凝固し、得
られた凝固糸を延伸して単繊維繊度が0.05d以下か
つ紡糸油剤の抽出量が繊維重量の0.5〜1%の範囲に
あるセメント補強用繊維集合体の製法。Claim 1: A spinning stock solution with a polymer concentration of 3 to 8% obtained by dissolving an acrylonitrile polymer having a weight average molecular weight of 400,000 or more and having 80% by weight or more of acrylonitrile units in dimethylformamide or dimethylacetamide is processed by wet spinning. The fibers are spun using a spinning method, coagulated in a coagulation bath consisting of water and dimethylformamide or dimethylacetamide, and the resulting coagulated fibers are stretched to obtain a single fiber fineness of 0.05d or less and an extraction amount of spinning oil of 0.05% of the weight of the fibers. A method for manufacturing a fiber aggregate for cement reinforcement in the range of 5 to 1%.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP913491A JPH04245912A (en) | 1991-01-29 | 1991-01-29 | Production of fiber for reinforcing cement |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP913491A JPH04245912A (en) | 1991-01-29 | 1991-01-29 | Production of fiber for reinforcing cement |
Publications (1)
Publication Number | Publication Date |
---|---|
JPH04245912A true JPH04245912A (en) | 1992-09-02 |
Family
ID=11712158
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP913491A Pending JPH04245912A (en) | 1991-01-29 | 1991-01-29 | Production of fiber for reinforcing cement |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH04245912A (en) |
-
1991
- 1991-01-29 JP JP913491A patent/JPH04245912A/en active Pending
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