JP2018150633A - Resin-reinforcing woven fabric and resin molding using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide: a resin-reinforcing woven fabric which has good adhesion to rubber or resin, and therefore, does not require the use of an adhesive; and a resin molding using the same.SOLUTION: In a resin-reinforcing woven fabric, a warp yarn composing the woven fabric is composed of a multifilament which has a dry heat shrinkage of 5.0% or less after heat treatment at 180°C for 20 minutes; and a weft yarn composing the woven fabric is composed of a monofilament containing a heat-bonding component. The heat-bonding monofilament may be formed of a sheath-core conjugate fiber. In this case, both the core and the sheath components are composed of polyester-based polymers. The polyester-based polymer of the sheath component as heat-bonding component has a melting point lower than the polyester-based polymer of the core component. A resin molding is obtained by heat-bonding the resin-reinforcing woven fabric to a resin sheet.SELECTED DRAWING: None

Description

  The present invention relates to a resin-reinforced fabric and a resin-reinforced molded product using the fabric.

  One type of resin molding is a resin belt. In the resin belt, generally, a reinforcing material for securing strength is attached to or embedded in a belt-shaped rubber layer or resin layer. As the reinforcing material, a woven fabric using natural fibers or a woven fabric using twisted yarns of organic synthetic fibers such as polyamide, polyester, polyethylene, polyurethane, polystyrene, polyacryl and the like is often used depending on the use of the belt. ing. In applications where the belt is required to be tensioned, these fibers are generally subjected to high-temperature heat treatment in a state of being tensioned in the warp direction of the woven fabric, so that required physical properties are imparted. And an adhesive agent is apply | coated to the textile fabric provided with this required physical property, and a resin layer is manufactured by adhere | attaching a rubber layer and a resin layer on it (patent document 1).

JP 2009-061742 A

  However, it is not easy to bond the woven fabric to the rubber layer or the resin layer. That is, since the types of rubber and resin differ depending on the environment in which the belt as the final product is used, an appropriate adhesive must be selected and used. In addition, there is a problem that it takes time and cost to apply the adhesive to the fabric.

  Accordingly, an object of the present invention is to obtain a resin reinforcing fabric and a resin molded product using the fabric, which are excellent in adhesiveness to rubber and resin, and therefore do not require the use of an adhesive.

  The gist of the present invention for achieving this object is the following (1) to (3).

  (1) The warp constituting the woven fabric is composed of multifilaments having a dry heat shrinkage rate of 5.0% or less after heat treatment for 20 minutes in an atmosphere of 180 ° C., and the weft constituting the woven fabric, A fabric for resin reinforcement characterized by comprising a monofilament having a heat-adhesive component.

  (2) A monofilament having thermal adhesiveness is formed of a core-sheath type composite fiber, and both the core component and the sheath component are composed of a polyester polymer, and the sheath component as a thermal adhesive component The polyester reinforcing polymer has a lower melting point than the polyester polymer as the core component, (1) The resin reinforcing fabric.

  (3) A resin molded article using the reinforcing fabric, wherein the resin reinforcing fabric of (1) or (2) is thermally bonded to a resin sheet.

  According to the present invention, since the wefts constituting the woven fabric are composed of monofilaments having a thermal adhesive component, the woven fabric and rubber or resin can be thermally bonded. In the process of adhering, a complicated processing step of selecting an appropriate adhesive for rubber or resin and applying it to the fabric becomes unnecessary. Moreover, since it is a monofilament, it has rigidity according to it, so that it can be made into a resin reinforcing fabric having tension in the weft direction of the fabric.

  The woven fabric for resin reinforcement of the present invention uses low-shrinkage multifilaments for warps and heat-adhesive monofilaments for wefts.

  If heat-adhesive fibers are also used for the warp, the adhesion to rubber and resin is significantly improved. However, it becomes difficult to handle the finished woven fabric or resin molding when it is bent or rolled. For this reason, as the warp, a multifilament having a high melting point that does not have thermal adhesiveness and low shrinkage is used. The low shrinkage has the advantage that there is no need to worry about warp shrinkage when the fabric is thermally bonded to rubber or resin. Low shrinkage here means that the dry heat shrinkage rate during heat treatment at 180 ° C. for 20 minutes is 5.0% or less. In particular, a polyester multifilament with low shrinkage can be preferably used.

  The weft is constituted by a monofilament having a thermal bonding component. The reason why the monofilament is used is that the multifilament may be flattened due to softness during a hot press process when thermally bonded to rubber or resin. By being a monofilament, it is possible to maintain the weft tension in the fabric. Further, in the case of a woven fabric or a resin molded product having a long length (the warp direction is the longitudinal direction), by forming only the wefts with monofilaments, there is an effect that the rolls can be easily wound and bent in the warp direction.

  The thermal bonding component of the weft can be suitably formed of a synthetic resin such as polyamide, aliphatic polyester, aromatic polyester, or polypropylene. Polyolefin resin is preferable in terms of adhesiveness, but polyester resin is particularly preferable from the viewpoint of strength. The fiber cross section of the weft may be a round cross section or an irregular cross section.

  The weft monofilament is preferably a core-sheath composite fiber. In that case, the core part is formed of a resin having a high melting point, and the sheath part is made of a resin having a melting point lower than that of the core part. Only the part softens or melts and functions as a heat-adhesive component, and the core part can function as a reinforcing material in a state in which the fiber form is maintained without being softened or melted.

  When the weft is a core / sheath composite fiber, both the core and the sheath are preferably formed of a polyester polymer. That is, it is preferable that the polyester polymer in the sheath has a lower melting point than the polyester polymer in the core. As such a fiber, for example, a fiber in which high-viscosity polyester is arranged in the core portion and copolymer polyester is arranged in the sheath portion can be suitably used.

  Specifically, the core can be composed of a high viscosity polyester having an intrinsic viscosity of 0.6 to 1.0. Thereby, the strength of the fiber can be increased. As the high-viscosity polyester, polyethylene terephthalate (melting point: about 260 ° C.), polybutylene terephthalate (melting point: about 220 ° C.), polyethylene naphthalate (melting point: about 270 ° C.) and the like are preferable from the viewpoint of dimensional stability. Of these, polyethylene terephthalate is more preferable from the viewpoint of cost. The high-viscosity polyester in the core may be added with weathering agents, pigments, colorants, flame retardants, matting agents and the like to such an extent that the stretchability and strength of the fiber are not impaired.

  Since the sheath part functions as a thermal adhesive, the sheath part can be made of a copolymer polyester having a melting point of 130 to 200 ° C., which is 10 ° C. or more lower than the core part. For example, copolymer polyester or terephthalic acid component, ethylene glycol component, 1,4 butanediol component composed of 4 components of terephthalic acid component, aliphatic lactone component, ethylene glycol component, 1,4 butanediol component And a copolyester composed of Since such a copolyester has a crystalline melting point, heat treatment for thermal bonding can be performed stably. Further, by forming the copolymer polyester having such a crystalline melting point, the sheath portion has heat resistance, and is advantageous in that it does not easily soften or deform due to frictional heat and maintains a good adhesive force. The copolyester of the sheath may be added with a matting agent, a coloring agent, an antibacterial agent, a flame retardant, a crystal nucleating agent, an antistatic agent, etc. to such an extent that the yarn-making property and thermal adhesiveness are not impaired. Absent.

  The composition ratio of the core part to the sheath part in the core-sheath composite fiber is preferably a mass ratio of (core part) :( sheath part) = 1: 1 to 5: 1, and 2: 1 to 3: 1. More preferably. If the composition ratio of the sheath portion is low outside this range, the thermal adhesive force becomes inferior. On the contrary, if the composition ratio of the sheath part is high outside this range, the composition ratio of the core part is lowered by that amount, and it is difficult to increase the strength.

  The fineness of the weft monofilament is not particularly limited, and can be appropriately selected according to the situation. The basis weight of the resin reinforcing fabric can be appropriately selected depending on the situation.

  The woven structure of the resin reinforcing fabric is not particularly limited, and can be appropriately selected depending on the situation. For example, plain weaving, oblique weaving, and satin weaving, which are three woven fabrics, can be mentioned. Moreover, the change structure | tissue etc. based on these woven structures are mentioned. In the case where it is desired to increase the thickness of the woven fabric, a multi-woven fabric can be used. In particular, the larger the area of the weft that adheres to rubber or resin, the better the adhesion. For this reason, it is preferable that the heat-adhesive component of the weft has a woven structure having a large area to be bonded to rubber or resin. Specifically, a structure such as a plain weave or satin weave that has a wide adhesive surface with a rubber or resin for the heat-adhesive component of the weft is suitable.

(Fabric used for performance evaluation)
A low-shrinkage multifilament yarn comprising a polyester resin and having a dry heat shrinkage of 4.0% after heat treatment at 180 ° C. for 20 minutes was prepared. Specifically, this yarn was a 1100 dtex / 192 filament multifilament yarn made of polyethylene terephthalate (melting point 260 ° C.). Two multifilament yarns were subjected to an S twist of 120 T / m by a ring twisting machine to obtain a twisted yarn.

  On the other hand, a monofilament yarn composed of a polyester-based heat-bonding fiber was prepared. This yarn had a core-sheath composite form, and the composition ratio of the core part to the sheath part was (mass ratio): (core part) :( sheath part) = 3: 1. And it was set as the monofilament yarn of the fineness 1000dtex which the core part was comprised with the polyethylene terephthalate (melting | fusing point 260 degreeC), and the sheath part was comprised with the copolyester (melting | fusing point 160 degreeC).

A plain fabric was woven with multifilament yarn as warp, monofilament yarn as weft, warp density of 32 / inch, and weft density of 27 / inch.
(Lamination of fabric and resin sheet)

  Two types of resin sheets were prepared: a polyvinyl chloride (PVC) sheet and a urethane sheet. The resin sheet was cut to a width of 3 cm and a length of 15 cm, and the woven fabric was cut to a width of 5 cm in the warp direction and a width of 30 cm in the weft direction. And it set to the hot press testing machine so that the resin sheet might overlap with a textile fabric, and it processed.

(Measurement of peel strength of bonded samples)
The sample left a chuck grip in the length direction for measurement of peel strength. Then, an autograph AG50kNI manufactured by Shimadzu Corporation is used, a flat chuck is used as the chuck, the gripping portions of the sample are sandwiched between the upper and lower chucks, and the fabric is pulled from the resin sheet by pulling at a pulling speed of 50 mm / min. The force required for this was measured. And the strength value when it peeled 5 cm in the length direction of the sample was made into peeling strength.

(Discoloration judgment)
When the resin sheet was melted by the influence of heat by the heat press treatment and exuded from between the fibers of the fabric, the quality was judged by the presence or absence of discoloration in the exuded portion. Then, the case where there was no oozing or discoloration as judged by visual observation was evaluated as “◯”, and the case where the oozing-out portion was discolored was evaluated as “x”.

(Example 1-2, Reference Example 1-5)
The fabric and the resin sheet were thermally bonded under the hot press conditions shown in Table 1 to obtain a sample of Example 1-2 and a sample of Reference Example 1-5 in which the hot press conditions were not appropriate. The evaluation results are shown in Table 1.

  The sample of Example 1-2 had a high peel strength value and was not easily peeled off. Further, no seepage of the resin sheet to the fabric side by hot pressing could be confirmed.

  Although the sample of Reference Example 1-3 could not be confirmed to extrude the resin sheet to the fabric side by hot pressing, the peel strength was low enough to be removed by human power.

  In Reference Example 4-5, although the adhesive strength, that is, the peel strength was excellent, the seepage of the resin sheet and the discoloration thereof were remarkable.

Claims (3)

  The warp constituting the woven fabric is composed of multifilaments having a dry heat shrinkage of 5.0% or less after heat treatment for 20 minutes in an atmosphere of 180 ° C., and the weft constituting the woven fabric has thermal adhesiveness A resin-reinforced fabric comprising a monofilament having components.   A monofilament having thermal adhesiveness is formed of a core-sheath composite fiber, and both the core component and the sheath component are made of a polyester polymer, and the polyester component weight of the sheath component as the thermal adhesive component 2. The resin reinforcing fabric according to claim 1, wherein the coalescence has a lower melting point than that of the polyester polymer as the core component.   A resin molded product using the reinforcing fabric, wherein the resin reinforcing fabric according to claim 1 or 2 is thermally bonded to a resin sheet.