JP2002021934A - Cast urethane belt - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a cast urethane belt superior in jumping resistance, durability and flexibility as the belt. SOLUTION: In this cast urethane belt for constituting a tooth part 2 and a web 1 of urethane elastomer and embedding conductors 3 in the web 1, the cast urethane belt is formed by integrally molding high rigidity urethane elastomer for constituting the tooth part 2 and a tooth part side layer 10 of the web 1 and low rigidity urethane elastomer for constituting a back face side layer 11 of the web 1.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cast urethane belt.

[0002]

2. Description of the Related Art In a conventional casting urethane belt, a tooth portion and a web are formed of one kind of urethane elastomer, and a core wire is embedded in the web.

[0003] Therefore, those made of a high-rigid urethane elastomer have excellent jumping resistance and durability, but have difficulty in flexibility as a belt.
Conversely, a belt made of a low-rigid urethane elastomer has excellent flexibility as a belt, but has disadvantages in jumping resistance and durability.

[0004] However, in recent market trends, there has been an increasing demand for conflicting performance between the teeth and the back side of the web, and in particular, a note that has excellent jumping resistance, durability, and flexibility as a belt. A urethane type belt is required.

Accordingly, cast urethane belts are manufactured and manufactured.
The selling industry is working on developing cast urethane belts with excellent jumping resistance, durability and flexibility as belts.

[0006]

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a castable urethane belt excellent in jumping resistance, durability, and flexibility as a belt.

[0007]

Means for Solving the Problems (Invention of Claim 1)
The cast urethane belt of the present invention is configured such that the teeth and the web are made of a urethane elastomer, and in the cast urethane belt in which the core wire is embedded in the web, the teeth and the teeth side layer of the web are formed. The high-rigid urethane elastomer and the low-rigid urethane elastomer forming the back layer of the web are integrally formed. (Invention according to claim 2) The cast urethane belt according to the present invention relates to the invention according to claim 1, wherein the core wire is formed of a low-rigid urethane elastomer constituting a backside layer of the web;
Alternatively, it is embedded in one of the highly rigid urethane elastomers constituting the tooth side layer of the web. (Claim 3) The cast urethane belt according to the present invention relates to the above-described claim 1 or 2, wherein an antistatic agent is added to the low-rigid urethane elastomer constituting the back side layer. .

The operation and effect of the cast urethane belt of the present invention will be clarified in the following embodiments of the present invention.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described with reference to the drawings showing embodiments. (Embodiment 1) FIG. 1 shows a cast urethane belt B of Embodiment 1, and FIGS. 2 and 3 show a mold for manufacturing the cast urethane belt B. [Configuration of Cast Urethane Belt B] As shown in FIG. 1, the cast urethane belt B has a web 1 made of urethane elastomer and a tooth portion 2, and constitutes the web 1. A core wire 3 is buried in a portion of the web 1 that is not formed with a pip on the root surface and is separated from the root surface.

Here, the web 1 and the teeth 2 are made of urethane elastomer as described above.
As shown in FIG. 1, a high-rigidity urethane elastomer forming the tooth portion 2 and the tooth-side layer 10 of the web 1 and a low-rigidity urethane elastomer forming the back-side layer 11 of the web 1 are integrally molded. It is formed as described above.

The highly rigid urethane elastomer is obtained by mixing and curing 100% by weight of a urethane prepolymer, 3 to 5% by weight of silicone oil, and 12.63% by weight of a curing agent. 100% by weight of a polymer, 30% by weight of a plasticizer, and 12.63% by weight of a curing agent are mixed and cured. In addition, as a method of changing the rigidity of the urethane elastomer, a known method such as changing the molecular weight of the urethane elastomer, in addition to changing the compounding amount of the above-described plasticizer or curing agent, can be adopted.

As the core wire 3, for example, aramid fiber or metal cord can be used, and it may be a single wire or a single wire twisted.

The following urethane prepolymer, plasticizer and curing agent can be used. (Urethane Prepolymer) The urethane polymer that can be used is not particularly limited, and is composed of generally used diisocyanate and one or two kinds of polyester-based polyol, polyether-based polyol, and the like.

As the diisocyanate, toluene diisocyanate (TDI), diphenylmethane diisocyanate (MDI), hexamethylene diisocyanate (HDI), cyclohexane diisocyanate (CHD)
I), naphthalenediisocyanate (NDI) and the like.

The polyester polyol is, for example, a condensate of a polycarboxylic acid and a low molecular weight polyol,
It has a molecular weight of 500 to 10,000. In particular,
Poly (ethylene adipate) (hereinafter referred to as “PEA”), poly (diethylene adipate) (hereinafter “PDA”)
), Poly (propylene adipate) (hereinafter referred to as “PP
A), poly (tetramethylene adipate) (hereinafter referred to as “PBA”), poly (hexamethylene adipate) (hereinafter referred to as “PHA”), poly (neonpentylene adipate (hereinafter referred to as “PNA”) , 3-methyl-
Polyol consisting of 1,5-pentanediol and adipic acid, random copolymer of PEA and PDA, PEA and P
PA random copolymer, PEA and PBA random copolymer, PHA and PNA random copolymer, or
Caprolactone polyol obtained by ring-opening polymerization of ε-caprolactone, polyol obtained by ring-opening β-methyl-δ-valerolactone with ethylene glycol, and the like (all of which may have a molecular weight of 500 to 10,000) Each of which is used alone or in combination. further,
Examples of the polyester-based polyol include a copolymer of at least one of the following acids and at least one of glycol.

Acids: terephthalic acid, isophthalic acid, phthalic anhydride, succinic acid, adipic acid, azelaic acid, sebacic acid, dodecane diacid, dimer acid (mixture), paraoxybenzoic acid, trimellitic anhydride, ε-caprolactone, β-methyl-δ-valerolactone glycol: ethylene glycol, propylene glycol, 1,4-butanediol, 1,5-pentanediol, 1,6-hexanediol, neobentyl glycol, polyethylene glycol, polytetramethylene glycol, Examples of the 1,4-cyclohexanedimethanol, pentaerythritol, 3-methyl-1,5-pentanediol polyether polyol include, for example, an alkylene oxide (eg, ethylene oxide, propylene oxide) as an active hydrogen compound. Those obtained by ring-opening addition polymerization using a polyhydric alcohol (eg, diethylene glycol) as an initiator, specifically, polypropylene glycol (PPG), polyethylene glycol (PEG), a copolymer of propylene oxide and ethylene oxide, and the like. Can be It is provided by cationic polymerization of tetrahydrofuran and has a molecular weight of 500 to 500.
5000. Specifically, it is polytetramethylene ether glycol (PTMG), and tetrahydrofuran is a copolymer with another alkylene oxide, specifically, a copolymer of tetrahydrofuran and propylene oxide, and tetrahydrofuran and ethylene. Copolymers with oxides (all of which have a molecular weight of 5
00 to 10,000).
Each may be used alone or in combination. (Plasticizer) Examples of the plasticizer include dioctyl phthalate (DOP), dibutyl phthalate (DBP), dioctyl adipate (DOA), and tricresyl phosphate (TC).
P), chlorinated paraffin and the like can be used. (Curing Agent) The curing agent is not particularly limited, and may be any of those generally used in curing a urethane prepolymer to form a urethane elastomer. For example, a polyamine compound, a polyol and the like can be mentioned.

The polyamine compound is not particularly limited, such as diamine, triamine and tetraamine, and any of primary amine, secondary amine and tertiary amine can be used. Specifically, aliphatic amines such as hexamethylenediamine, aliphatic amines such as 3-3′-dimethyl-4,4′-diaminodicyclohexylmethane, 4,4′-methylenebis-2-chloroaniline, 2,2 '3,3'-
Tetrachloro-4,4'-diaminophenylmethane,
Aromatic amines such as 4,4-diaminodiphenyl;
4,6-tris (dimethylaminomethyl) phenol and the like. One of these curing agents may be used alone, or two or more of them may be used in combination.

The polyol compound is not particularly limited, and any of a primary polyol, a secondary polyol and a tertiary polyol may be used. Specific examples include ethylene glycol, 1,3-propanediol, and 1,4-butanediol. (Accelerator) It can be used according to the production conditions. [Manufacturing method of cast urethane belt B] Next, the manufacture of the cast urethane belt B will be described (see FIGS. 2 and 3). First molding step As shown in FIG. 2, an inner mandrel 7A having a tooth forming groove 70 on the outer peripheral surface is inserted into an outer shell 6A having a small inner diameter, and upper and lower plates 8 are provided at upper and lower ends of the outer shell 6A. , 9 are fitted. In this state, between the outer shell 6 </ b> A and the inner mandrel 7 </ b> A, a first intermediate body composed of the tooth side layer 10 and the tooth 2 forming a part of the web 1 is provided.
A space K1 corresponding to B1 is configured.

Here, after the outer shell 6A and the inner mandrel 7A are heated to 110 ° C., as shown in FIG. 2, the urethane UEH in the casting container 60 is filled with 20 kgf / cm.
^The space K1 is filled with the casting urethane UEH through the casting tube 62 by pressurizing the piston 61 with a pressure of ² or less. When the casting urethane UEH is filled in the space K1, the casting urethane UEH flows out of the deaeration port 80 of the upper plate 8, and at the time of the outflow, the opening / closing screw 81 is screwed into the deaeration port 80 to remove. The air port 80 is closed, 110 ° C., 35 minutes, 10 to 30 kgf / cm ²
Press-molds the first intermediate B1.

In the above cast urethane UEH, the compounding amount of the curing agent is set as described above so as to obtain a highly rigid urethane elastomer after curing. First demolding / surface treatment step The first intermediate B1 is transferred from the outer shell 6A to the inner mandrel 7A.
The separation is performed in a semi-cured state in which the activity of the crosslinking point is not completely lost.

Next, the outer peripheral surface of the tooth portion side layer 10 of the first intermediate body B1 integrated with the inner mold mandrel 7A is polished (surface treated) to completely remove wear powder. By this surface treatment, the outer peripheral surface of the first intermediate B1 is free of an adhesion inhibitor such as a release agent, the contact area is increased and the anchoring effect is improved, and the outer peripheral surface of the first intermediate B1 is further removed. The surface where the activity of the crosslinking point is not lost is exposed further than before the surface treatment, and thus the adhesiveness is greatly improved. Core Wire Winding Step The core wire 3 is spirally wound around the outer peripheral surface of the tooth side layer 10 of the first intermediate body B1 which is integral with the inner mandrel 7A and has been subjected to the surface treatment (see FIG. 3). Second Molding Step As shown in FIG. 3, the inner mandrel 7A, the first intermediate body B1, and the second intermediate body B2 in which the core wire 3 are integrated are inserted into the outer shell 6A 'having a large inner diameter, Mold shell 6A '
The upper and lower plates 8 and 9 are fitted to the upper and lower ends of the mold.

The outer shell 6A 'having a large inner diameter and the second shell
Filling the space K2 between the intermediate B2 and the casting urethane UES in which the blending amounts of the plasticizer and the curing agent are set so as to become a low-rigid urethane elastomer after curing, and press-filling the back surface of the web 1 The side layer 11 is additionally molded (see FIG. 1). Second demolding step After a lapse of a fixed time from the second molding step, the molded slab is demolded. After-curing step In order to obtain physical properties as a belt, the sheet is kept heated for a while (after-curing) to complete the curing reaction. Slab Cutting Step After the after cure, the molded slab is cut at a predetermined width to complete the cast urethane belt B. [Function of cast urethane belt B manufactured using this method] Since the tooth side layers of the tooth portion 2 and the web 1 are made of a highly rigid urethane elastomer, and the back side layer occupying most of the web 1 is made of a low rigid urethane elastomer, jump resistance and durability are achieved. And it becomes what was excellent in flexibility as a belt. Further, since the core wire 3 is embedded in the low-rigid urethane elastomer, the fatigue of the core wire 3 can be suppressed. B. In the cast urethane belt B, the core wire 3 is completely exposed, so that the core wire damage factor can be reduced. C. According to this manufacturing method, the trajectory of the center line can be easily brought close to the theoretical PLD, and the polygonal behavior can be eliminated. [Other manufacturing methods of this cast urethane belt B]
The urethane belt having no pip as described above can also be manufactured by the following method. Hereinafter, this manufacturing method will be briefly described with reference to FIGS. Core Wire Winding Step The core wire 3 is wound around a large-diameter inner mandrel 7B having no tooth portion forming groove (see FIG. 4). First molding step A large-diameter inner mandrel 7B around which the core wire 3 is wound is inserted into the outer shell 6B, and a space K3 between the two is pressurized and filled with urethane UES to form a cylinder as shown in FIG. The back side layer 11 of the web 1 is formed. First demolding process The rear side layer 11 is left in the outer shell 6B to separate only the large-diameter inner mandrel 7B. The separation timing is determined by semi-curing in which the activity of the crosslinking point is not completely lost. State. Surface Treatment Step A surface treatment or the like is performed to improve the adhesiveness of the inner peripheral surface of the back side layer 11. However, in this case, a surface treatment that does not damage the core wire 3 as much as possible is selected. Second molding step As shown in FIG. 5, a small-diameter inner mandrel 7B 'having a tooth portion forming groove 70 is inserted into the back side layer 11 integral with the outer shell 6B, and the space K4 between the two is inserted. The cast urethane UEH is filled under pressure to form the teeth 2 and the web 1. Second demolding step After a lapse of a fixed time from the second molding step, the molded slab is demolded. After-curing step In order to obtain physical properties as a belt, the sheet is kept heated for a while (after-curing) to complete the curing reaction. Slab Cutting Step After the after cure, the molded slab is cut at a predetermined width to complete the cast urethane belt B. (Embodiment 2) FIG. 6 shows a cast urethane belt B of Embodiment 2, and FIGS. 7 and 8 show dies and the like for manufacturing the cast urethane belt B. [Regarding the structure of the cast urethane belt B] In the cast urethane belt B, as shown in FIG. 6, the teeth 2 and the web 1 are made of urethane elastomer, and the core wire 3 is embedded in the web 1. It has been done. In addition, in FIG. 6, the code | symbol P has shown pip.

Here, in the cast urethane belt B, similarly to the first embodiment, a highly rigid urethane elastomer constituting the tooth portion 2 and the tooth portion side layer 10 of the web 1 is provided.
It is formed by integrally molding a low-rigid urethane elastomer constituting the back side layer 11 of the web 1. The combination of the silicone, the curing agent and the plasticizer is the same as in the first embodiment. [About the manufacturing method of the cast urethane belt B] Next, the manufacture of the cast urethane belt B will be described (see FIGS. 7 and 8). Core Wire Winding Step The core wire 3 is spirally wound around an inner mandrel 7C having a tooth part forming groove 70 on the outer peripheral surface (see FIG. 7). First Forming Step As shown in FIG. 7, the inner mandrel 7C around which the core wire 3 is wound is inserted into the outer shell 6C having a small inner diameter, and the upper and lower plates 8, 9 are fitted to the upper and lower ends of the outer shell 6C. And mold it. In this state, the outer shell 6C
And a space between the inner mandrel 7C and the intermediate body B3 composed of the core wire 3 and the tooth side layer 10 of the web 1 and the tooth portion 2.
K5 is formed.

The space K5 is filled with cast urethane UEH in the same manner as in the first embodiment, and the intermediate B3 is molded under pressure. First demolding / surface treatment step The intermediate B3 is separated from the outer shell 6C having a small inner diameter integrally with the inner mandrel 7C. The separation timing is determined by semi-curing in which the activity of the crosslinking point is not completely lost. State. Then, the outer peripheral surface of the intermediate body B3 is subjected to substantially the same surface treatment as in the first embodiment. Second molding step Intermediate B3 after surface treatment integrated with inner mold mandrel 7C
As shown in FIG. 8, the cast urethane UE which is inserted into the outer shell 6C 'having a large inner diameter and becomes a low-rigid urethane elastomer after being cured in the space K6 between the two.
S is pressurized and the back side layer 11 of the web 1 is additionally molded. Second demolding step After a lapse of a fixed time from the second molding step, the molded slab is demolded. After-curing and slab cutting step This is performed in the same manner as in the first embodiment. (Others) The surface treatment in the production method of the cast urethane belt B includes the removal of a weak boundary layer (solvent cleaning and degreasing cleaning), the enhancement of the surface roughness effect (blast treatment and solvent cleaning), and the enhancement of interfacial bonding force. (Primer treatment, corona / plasma treatment, and chromic acid mixed solution treatment) are not particularly limited to the above treatment methods as long as the adhesion is improved.

In the first and second embodiments, if necessary, the friction coefficient of the surface of the back side layer 11 and the friction coefficient of the surface of the tooth portion 10 may be different.

Further, in the first and second embodiments, an antistatic agent may be added to the low-rigid urethane elastomer constituting the backside layer 11 if necessary.

[0027]

The present invention has the following effects since it has the above-described configuration.

As is clear from the description of the embodiment of the present invention, a castable urethane belt excellent in jumping resistance, durability, and flexibility as a belt can be provided.

[Brief description of the drawings]

FIG. 1 is an explanatory view of a cast urethane belt according to a first embodiment of the present invention.

FIG. 2 is an explanatory view of a first molding step and the like in the method for producing a cast urethane belt.

FIG. 3 is an explanatory view of a second molding step and the like in the method for producing a cast urethane belt.

FIG. 4 is an explanatory view of a first molding step and the like in another method of manufacturing the cast urethane belt.

FIG. 5 is an explanatory view of a second molding step and the like in another method of manufacturing the cast urethane belt.

FIG. 6 is an explanatory diagram of a cast urethane belt according to a second embodiment of the present invention.

FIG. 7 is an explanatory view of a first molding step and the like in the method for manufacturing a cast urethane belt of the second embodiment.

FIG. 8 is an explanatory view of a second molding step and the like in the method for manufacturing a cast urethane belt according to the second embodiment.

[Explanation of symbols]

 UEH Cast urethane UES Cast urethane B Cast urethane belt B1 First intermediate B2 Second intermediate B3 Intermediate K1 Space K2 Space K3 Space K4 Space K5 Space K6 Space 1 Web 2 Tooth 3 Core wire 6A Outer shell 6A 'Outer shell 6B Outer shell 6C Outer shell 6C' Outer shell 7A Inner mandrel 7B Inner mandrel 7B 'Inner mandrel 7C Inner mandrel 8 Lower plate 9 Upper plate 10 Tooth side layer 11 Back side layer

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme court ゛ (Reference) F16G 1/28 F16G 1/28 EZ // B29K 21:00 B29K 21:00 75:00 75:00 105 : 16 105: 16 105: 20 105: 20 B29L 15:00 B29L 15:00 F term (reference) 4F204 AA31 AA45 AB03 AB07 AD03 AD09 AD15 AD16 AD18 AG17 AH12 EA03 EF05 EK10 EW22 EW23 EW31 EW34

Claims (3)

[Claims] 1. A cast urethane belt in which a tooth portion and a web are made of a urethane elastomer, and a core wire is embedded in the web, and a high rigidity forming a tooth portion and a tooth portion side layer of the web is provided. And a low-rigid urethane elastomer forming the back side layer of the web by integral molding. 2. The core wire is embedded in one of a low-rigidity urethane elastomer constituting a back side layer of the web and a high-rigidity urethane elastomer constituting a tooth side layer of the web. The cast urethane belt according to claim 1, wherein: 3. The cast urethane belt according to claim 1, wherein an antistatic agent is added to the low-rigid urethane elastomer constituting the back side layer.