KR20220055862A - Biomass-based midsole foam composition - Google Patents

Abstract

The present invention relates to a foam composition using biomass for a shoe midsole. The foam composition according to the present invention includes 50-90 parts by weight of ethylene vinyl acetate, 10-50 parts by weight of biomass, 1-5 parts by weight of a silane-based coupling agent, 1-10 parts by weight of vegetable oil, 1-3 parts by weight of a foaming agent and 1-3 parts by weight of a crosslinking agent, and is formed through foaming, wherein each of the biomass and ethylene vinyl acetate reacts with the silane-based coupling agent so that the biomass and ethylene vinyl acetate may be bound at the interface.

Description

Foam composition for shoe midsole using biomass {BIOMASS-BASED MIDSOLE FOAM COMPOSITION}

The present invention relates to a foam composition for a shoe midsole using biomass.

The sole of the shoe consists of a midsole made of rubber, foam resin, or sponge material with excellent cushioning power so that the body load can be distributed and supported elastically during walking, and a rubber material is attached to the lower part of the midsole to provide friction when walking. It is made of manufactured outsole.

Midsoles are usually manufactured using ethylene vinyl acetate (EVA), polyurethane (PU), etc. as main raw materials. Among them, ethylene vinyl acetate accounts for more than 80% of the midsole market.

The process of manufacturing a conventional midsole is as follows. A compound in which ethylene vinyl acetate alone is blended with a crosslinking agent, a foaming agent and other additives is prepared in the form of a sheet, put into a closed mold, and then processed under high temperature and pressure using a press to decompose the crosslinking agent and foaming agent. Thereafter, the mold is momentarily opened to remove the pressure, and a primary compression process of rapidly expanding using the pressure difference is followed to obtain a primary foam having a soft closed-cell structure. The primary foam is made to a certain thickness and size using a skiving machine and a cutter, and then undergoes a trimming and grinding process. Then, it is put into a mold having the shape of the product, compressed at a high temperature, and cooled again with the mold closed to obtain a desired shape through a repress process of demolding the product.

For example, in 'biodegradable shoe midsole foam composition and manufacturing method thereof (registration number: 10-0575604)', a shoe midsole foam composition that can be foamed using ethylene vinyl acetate, 1,2-polybutadiene and a starch-based resin is presented. there is a bar

However, 1,2-polybutadiene was added to supplement the starch-based resin that causes crosslinking delay to prevent deterioration of the physical properties of the foam. There is a problem that butadiene does not function properly.

On the other hand, the cases of using biomass in order to reduce the use of petroleum-derived resources are gradually increasing. Since biomass itself has poor processability, there is a problem that foaming is not good and the physical properties are significantly lowered, It is a time when technology development research to improve this is urgently required.

Registered Korean Patent Publication No. 10-0575604, on April 25, 2006.

The present invention was invented to solve the above problems, and by applying to ethylene vinyl acetate using discarded biomass, it is environmentally friendly and provides a foam composition for a midsole shoe that allows stable foaming to have excellent processability make it a technical solution.

In order to solve the above technical problem, the present invention, in the foam composition, 50 to 90 parts by weight of ethylene vinyl acetate, 10 to 50 parts by weight of biomass, 1 to 5 parts by weight of a silane coupling agent, 1 to 10 parts by weight of vegetable oil Parts, 1-3 parts by weight of a foaming agent, and 1-3 parts by weight of a crosslinking agent are formed through foaming, and the biomass and the ethylene vinyl acetate are reacted with the silane-based coupling agent, respectively, so that the biomass and the ethylene vinyl acetate are It provides a foam composition for a shoe midsole using biomass, characterized in that it is interfacially bonded.

In the present invention, the biomass is a powder formed by pulverizing at least one selected from the group consisting of grain husks, rice straw, corn stalks, barley stalks, rice husks, wood flour and starch.

In the present invention, the vegetable oil is olive oil, macadamia oil, sunflower seed oil, camellia oil, castor oil, jojoba oil, almond oil, apricot seed oil, green tea oil, meadowfoam seed oil, argan oil, and mixtures thereof. As one selected from, it is characterized in that the fluidity of the foam composition is controlled.

In the present invention, the silane-based coupling agent is a silane compound represented by the following formula (1).

[Formula 1]

However, R ₁ , R ₂ and R ₃ are a hydroxyl group, a C ₁ -C ₁₀ alkyl group, or a C ₁ -C ₁₀ alkoxy group, X is a single bond or a C ₁ -C ₁₀ alkylene group, Y is a mercapto group , an amino group, a vinyl group, a methacryl group, a methacryloxy group, an epoxy group, or glycidoxy.

According to the foam composition for a shoe midsole using biomass of the present invention as a means to solve the above problems, by reducing the use of petroleum-derived resources using biomass, it meets low-carbon and eco-friendly policies, and biomass by a silane-based coupling agent It is possible to improve the bonding force between the and ethylene vinyl acetate, and it is possible to stabilize the foaming by controlling the fluidity of the composition by the vegetable oil, so that the physical properties are excellent.

1 is a graph showing a change in shear viscosity versus shear rate according to whether or not vegetable oil of the present invention is added.

Hereinafter, the present invention will be described in detail.

The present invention relates to a foam composition for a shoe midsole using biomass, 50 to 90 parts by weight of ethylene vinyl acetate, 10 to 50 parts by weight of biomass, 1 to 5 parts by weight of a silane coupling agent, 1 to 10 parts by weight of vegetable oil , is formed through foaming, including 1 to 3 parts by weight of a foaming agent and 1 to 3 parts by weight of a crosslinking agent, in particular, characterized in that biomass and ethylene vinyl acetate are mutually bonded by a silane-based coupling agent. At this time, as an additive, 1 to 5 parts by weight of metal oxide and 1 to 5 parts by weight of stearic acid can be further added. In the present invention, the type and amount of the additive are not limited, and the composition constituting the foam composition of the present invention is described below. It will be described in more detail.

Ethylene vinyl acetate is a component used as the base material of the foam composition.

As is known, ethylene vinyl acetate is widely used when manufacturing a midsole because of its excellent light weight, low price, and soft cushioning. It is not made uniformly well, and when added in excess of 90 parts by weight, better improvement in physical properties cannot be expected compared to the case where an amount of less than that is added. For this reason, ethylene vinyl acetate is preferably used in the range of 50 to 90 parts by weight.

Biomass is composed of sustainable resources generated from water and carbon dioxide by photosynthesis using solar energy.

Since the carbon dioxide emitted when burning biomass is the same as carbon dioxide absorbed into the atmosphere by photosynthesis during the growth process of living things, biomass has a carbon neutral property that does not increase the concentration of carbon dioxide in the atmosphere during its life cycle. has

Such biomass can be obtained from plants, trees, etc., for example, can be formed in a powder form by pulverizing one or more selected from the group consisting of grain husks, rice straw, corn stalks, barley stalks, rice husks, wood flour and starch.

If the biomass is less than 10 parts by weight, there is a disadvantage that the silane-based coupling agent does not function properly because the amount is not sufficient to be completely combined with ethylene vinyl acetate. Conversely, when the amount of biomass exceeds 50 parts by weight, the mixing viscosity of the foam composition increases, so that the foaming cannot be stably performed, and consequently, there is a disadvantage in that the physical properties are lowered.

The silane-based coupling agent has a structure having different amphoteric reactive groups in the molecule, and improves the bonding force between ethylene vinyl acetate and biomass to improve the mechanical properties of the foam composition.

The silane-based coupling agent acts as a contact point in the middle for bonding ethylene vinyl acetate, a polymer substrate, and biomass having a hydroxyl group (-OH) on the surface. There is a characteristic that prevents the bond from being untied. These characteristics are confirmed by the structure of the silane-based coupling agent consisting of a silane compound represented by the following formula (1).

[Formula 1]

However, R ₁ , R ₂ and R ₃ are a hydroxyl group, a C ₁ -C ₁₀ alkyl group, or a C ₁ -C ₁₀ alkoxy group, X is a single bond or a C ₁ -C ₁₀ alkylene group, Y is an organic functional group As such, it is a mercapto group, an amino group, a vinyl group, a methacryl group, a methacryloxy group, an epoxy group, or glycidoxy.

One end group of the silane-based coupling agent represented by Formula 1 has a functional group capable of bonding to biomass, and the other end group has a functional group capable of bonding with ethylene vinyl acetate. Thereby, by reacting with ethylene vinyl acetate at the Y reactor side, and reacting with the biomass at the R ₁ , R ₂ and R ₃ reactor side, it is possible to strengthen the bond between ethylene vinyl acetate and the biomass. As such, since the interface between ethylene vinyl acetate and biomass is bonded by the silane-based coupling agent, the mechanical properties of the foam composition can be improved.

Examples of the silane-based coupling agent include bis[3-(triethoxysilyl)propyl]tetrasulfide vinyltriethoxysilane, 3-glycidoxypropyl triethoxysilane, mercaptopropyl trimethoxysilane and 3-3 - At least one type may be selected from the group consisting of aminopropyltriethoxysilane. However, it is not limited to the above-mentioned types, and as long as it is a silane-based coupling agent that allows the biomass and ethylene vinyl acetate to be combined, it can be used in various ways.

In the case of a silane-based coupling agent, it may be mixed in the range of 1 to 5 parts by weight, but if it is less than 1 part by weight, bonding between ethylene vinyl acetate and biomass cannot be induced, so improvement of mechanical properties of the foam composition cannot be expected. On the other hand, when it exceeds 5 parts by weight, it is not preferable because the unreacted silane-based coupling agent between ethylene vinyl acetate and the biomass may perform a plasticizing action to reduce physical properties.

As described above, by using 1 to 5 parts by weight of the silane-based coupling agent, it is possible to prevent deterioration of mechanical properties of the foam composition by mutual bonding of biomass and ethylene vinyl acetate.

The vegetable oil is a composition that allows the foaming to be facilitated by lowering the blending viscosity of the foam composition according to the addition of biomass.

Prior to this, since other petroleum-based oils are undesirable in terms of sustainability, it is preferable to use vegetable oils. The vegetable oil may be, for example, one selected from the group consisting of olive oil, macadamia oil, sunflower seed oil, camellia oil, castor oil, jojoba oil, almond oil, apricot seed oil, green tea oil, meadowfoam seed oil, argan oil, and mixtures thereof. there is.

If the amount of vegetable oil is less than 1 part by weight, the amount is small enough to lower the viscosity of the foam composition, so foaming cannot be stably generated. When the amount of vegetable oil exceeds 10 parts by weight, the texture of the foam composition is excessively slippery and processability is deteriorated. For this reason, the vegetable oil is preferably mixed in the range of 1 to 10 parts by weight.

A foaming agent is a substance that generates bubbles in the foam composition, and is a component called an expanding agent or a foaming agent.

In the case of the blowing agent, azo-based compounds such as azodicarbonamide having a decomposition temperature of 130 to 190°C, nitroso-based compounds such as N,N'-dinitrosopentamethylenetetramine, and p-toluenesulfonylhydrazide and p,p'-oxybis(benzenesulfonylhydrazide) by selecting any one or more of sulfonylhydrazide-based compounds, p-toluenesulfonyl semicarba, azobisisobutyronitrile, and diazoaminoazobenzene. It can be used, and it can be used in various ways as long as it is known as a foaming agent for ethylene vinyl acetate.

The foaming agent may be added in an amount of 1 to 3 parts by weight, but if the foaming agent content is less than 1 part by weight, the foaming ratio is low and the hardness and specific gravity of the foam composition are too high. There is a disadvantage in that a stable foam cell structure cannot be obtained by foaming, and the mechanical properties of the manufactured midsole are rapidly reduced.

The crosslinking agent is composed of a peroxide system.

Such a crosslinking agent can be mixed in the range of 1 to 3 parts by weight. When added in an amount of less than 1 part by weight, the degree of crosslinking of the foam composition is lowered, so that mechanical strength is lowered as well as loss of foaming gas is increased, so it is difficult to form a foam. When it is mixed in excess of 3 parts by weight, the degree of crosslinking is increased to suppress expansion, which causes a problem in that the foamed cells burst.

In some cases, a crosslinking aid may be additionally mixed, and the crosslinking aid is to prevent excessive decomposition of ethylene vinyl acetate, and those commonly used in the art may be used.

The foam composition composed of the above-described configuration is expanded and expanded, manufactured in a sheet form using a press, cut to a required size, put in a press mold, pressurized at high temperature and high pressure, and cooled to manufacture a midsole. This is called the press method.

Alternatively, the midsole may be manufactured by injection molding in which the foaming agent composition having the configuration as described above is prepared as a compound in the form of pellets through an extruder, and this is put into an injection mold to maintain a heated state while crosslinking and foaming proceed. This is called the injection method.

In summary, the present invention is ethylene vinyl acetate 50 to 90 parts by weight, biomass 10 to 50 parts by weight, silane coupling agent 1 to 5 parts by weight, vegetable oil 1 to 10 parts by weight, foaming agent 1 to 3 parts by weight and crosslinking agent 1 It is foamed including ~3 parts by weight, and since the interfacial bonding between biomass and ethylene vinyl acetate is made through a silane-based coupling agent, it can be foamed stably, making the surface of the foam uniform, and mechanical properties are There are advantages to improving.

Hereinafter, an embodiment of the present invention will be described in more detail as follows. However, the following examples are merely illustrative to aid the understanding of the present invention, and the scope of the present invention is not limited thereby.

<Example 1>

80 parts by weight of EVA, 20 parts by weight of biomass, 2 parts by weight of silane coupling agent, 3 parts by weight of vegetable oil while maintaining a speed of 50 to 75 rpm at a temperature of 80 to 100 ° C using a temperature-controllable Banbari mixer or kneader mixer A mixture was prepared by adding parts by weight and a crosslinking aid and mixing for 10 minutes.

Again, while maintaining a speed of 40 to 60 rpm in an open roll mill maintained at 80° C., 1.5 parts by weight of a crosslinking agent and 3 parts by weight of a foaming agent were added to the mixture, and the mixture was further mixed for 5 minutes to prepare a foam composition.

<Example 2>

70 parts by weight of EVA, 30 parts by weight of biomass, 3 parts by weight of silane coupling agent, 3 parts by weight of vegetable oil while maintaining a speed of 50 to 75 rpm at a temperature of 80 to 100 ° C using a temperature-controllable Banbari mixer or kneader mixer A mixture was prepared by adding parts by weight and a crosslinking aid and mixing for 10 minutes.

Again, while maintaining a speed of 40 to 60 rpm in an open roll mill maintained at 80° C., 1.5 parts by weight of a crosslinking agent and 3 parts by weight of a foaming agent were added to the mixture, and the mixture was further mixed for 5 minutes to prepare a foam composition.

<Example 3>

70 parts by weight of EVA, 30 parts by weight of biomass, 3 parts by weight of silane coupling agent, 5 parts by weight of vegetable oil while maintaining a speed of 50 to 75 rpm at a temperature of 80 to 100 ° C using a temperature-controllable Banbari mixer or kneader mixer A mixture was prepared by adding parts by weight and a crosslinking aid and mixing for 10 minutes.

Again, while maintaining a speed of 40 to 60 rpm in an open roll mill maintained at 80° C., 1.5 parts by weight of a crosslinking agent and 3 parts by weight of a foaming agent were added to the mixture, and the mixture was further mixed for 5 minutes to prepare a foam composition.

<Example 4>

60 parts by weight of EVA, 40 parts by weight of biomass, 4 parts by weight of a silane coupling agent, 5 parts by weight of vegetable oil while maintaining a speed of 50 to 75 rpm at a temperature of 80 to 100 ° C using a temperature-controllable Banbari mixer or kneader mixer A mixture was prepared by adding parts by weight and a crosslinking aid and mixing for 10 minutes.

Again, while maintaining a speed of 40 to 60 rpm in an open roll mill maintained at 80° C., 1.5 parts by weight of a crosslinking agent and 3 parts by weight of a foaming agent were added to the mixture, and the mixture was further mixed for 5 minutes to prepare a foam composition.

<Comparative Example 1>

80 parts by weight of EVA, 20 parts by weight of biomass, 2 parts by weight of a silane coupling agent, and a crosslinking aid while maintaining a speed of 50 to 75 rpm at a temperature of 80 to 100 ° C using a temperature-controllable Banbari mixer or kneader mixer was added and mixed for 10 minutes to prepare a mixture.

Again, while maintaining a speed of 40 to 60 rpm in an open roll mill maintained at 80° C., 1.5 parts by weight of a crosslinking agent and 3 parts by weight of a foaming agent were added to the mixture, and the mixture was further mixed for 5 minutes to prepare a foam composition.

<Comparative Example 2>

Using a temperature-controllable Banbari mixer or kneader mixer, while maintaining a speed of 50 to 75 rpm at a temperature of 80 to 100 ° C, 70 parts by weight of EVA, 30 parts by weight of biomass, 3 parts by weight of vegetable oil and a crosslinking aid are added. The mixture was prepared by mixing for 10 minutes.

Again, while maintaining a speed of 40 to 60 rpm in an open roll mill maintained at 80° C., 1.5 parts by weight of a crosslinking agent and 3 parts by weight of a foaming agent were added to the mixture, and the mixture was further mixed for 5 minutes to prepare a foam composition.

<Comparative Example 3>

Using a temperature-controllable Banbari mixer or kneader mixer, add 70 parts by weight of EVA, 30 parts by weight of biomass, and a crosslinking aid while maintaining a speed of 50 to 75 rpm at a temperature of 80 to 100° C., and mix for 10 minutes. was prepared.

Again, while maintaining a speed of 40 to 60 rpm in an open roll mill maintained at 80° C., 1.5 parts by weight of a crosslinking agent and 3 parts by weight of a foaming agent were added to the mixture, and the mixture was further mixed for 5 minutes to prepare a foam composition.

The contents constituting the foam compositions according to Examples 1 to 4 and Comparative Examples 1 to 3 described above were summarized as in Table 1 below.

Example comparative example One 2 3 4 One 2 3 EVA 80 70 70 60 80 70 70 biomass ¹⁾ 20 30 30 40 20 30 30 vegetable oil ²⁾ 3 3 5 5 - 3 - metal oxide 3 3 3 3 3 3 3 stearic acid One One One One One One One Silane-based coupling agent ³⁾ 2 3 3 4 2 - - crosslinking agent 1.5 1.5 1.5 1.5 1.5 1.5 1.5 blowing agent ⁴⁾ 3 3 3 3 3 3 3 1) Cone Starch, Daejeonghwageum
2) Castor Oil, Daejeong Hwaeum
3) Si-69, Evonik
4) JTR, Geumyang

Referring to Table 1, Examples 1 to 4 prepared a foam composition using vegetable oil and a silane-based coupling agent, whereas Comparative Example 1 did not use vegetable oil as a comparative example to prepare for Example 1. A non-foam composition was prepared. Comparative Example 2 was a comparative example to prepare for Example 2, and a foam composition was prepared without using a silane-based coupling agent. In Comparative Example 3, as a comparative example for comparison with Examples 1 to 4, a foam composition was prepared without using vegetable oil and a silane-based coupling agent.

<Test Example 1>

In this test example, the physical properties of the foam composition specimens prepared in Examples 1 to 4 and Comparative Examples 1 to 3 were measured in the following manner, and the results are shown in Table 2.

1) Specific gravity: According to KS M 6519 standard, the density of the foam composition specimen was measured. At this time, the number of specimens used in the same test was 5.

2) Hardness: In accordance with KS M ISO 7619-1 standard, the indentation hardness was measured using a hardness meter for foam rubber. At this time, the number of specimens used in the same test was 5.

3) Tensile strength: In accordance with the KS M ISO 1798 standard, the tensile strength of the standard specimen was measured at a speed of 200 mm/min. At this time, the number of specimens used in the same test was 5.

4) Permanent compression set reduction: In accordance with KS M 6518 standard, the thickness change of the specimen was measured after leaving at 50° C. for 6 hours under 50% compression, and leaving it at room temperature for 30 minutes after removing the pressure. At this time, the number of specimens used in the same test was 5.

5) Rebound elasticity: In accordance with KS M ISO 8307 standard, an iron ball was dropped on a test piece at a prescribed height for ball repulsion elasticity, and the rebound height was measured. At this time, the number of specimens used in the same test was 5.

Test Items Example comparative example One 2 3 4 One 2 3 importance
(g/cc) 0.256 0.263 0.246 0.268 0.374 0.267 0.876 Hardness
(Shore C) 48 52 50 53 67 53 - The tensile strength
(kgf/cm ² ) 28 25 25 27 26 15 - permanent compression set
(%) 58 55 52 59 61 72 - rebound elasticity
(%) 43 43 45 43 35 43 -

Referring to Table 2, it can be seen that according to Examples 1 to 4, a foam composition for a shoe midsole can be obtained using biomass through a combination of vegetable oil, a silane-based coupling agent, and appropriate amounts of a crosslinking agent and a foaming agent. . That is, according to the physical property results of Examples 1 to 4, it can be seen that the bonding strength between the biomass and EVA is increased by the silane-based coupling agent.

On the other hand, as in Comparative Example 1, when vegetable oil was not used, the foaming ratio was low and specific gravity and hardness were increased. As in Comparative Example 2, if the silane-based coupling agent was not used, mechanical properties such as tensile strength and permanent compression set decreased. Also, referring to Comparative Example 3, it was confirmed that the foaming was not performed properly because vegetable oil and a silane-based coupling agent were not used.

On the other hand, FIG. 1 is a graph showing the change in shear viscosity compared to the shear rate according to whether or not vegetable oil is added according to the present invention, based on 70 parts by weight of EVA and 30 parts by weight of biomass, vegetable oil It can be seen that the change in shear viscosity when 5 parts by weight is added and when not added.

In the graph of Figure 1, Biomass shows the change in shear viscosity according to the shear rate when castor oil, a vegetable oil, is not added, and Biomass + Castor Oil shows the change in shear viscosity according to the shear rate when castor oil is added. it has been shown Referring to FIG. 1, it can be seen that the fluidity is further increased when castor oil is added than when castor oil is not added.

As described above, the present invention relates to a foam composition for a shoe midsole using biomass, and includes 50 to 90 parts by weight of ethylene vinyl acetate, 10 to 50 parts by weight of biomass, 1 to 5 parts by weight of a silane coupling agent, and vegetable oil. It is formed through foaming, including 1 to 10 parts by weight, 1-3 parts by weight of a foaming agent, and 1-3 parts by weight of a crosslinking agent, and has a feature that biomass and ethylene vinyl acetate can be combined with each other by a silane-based coupling agent.

According to these characteristics, it is possible to meet low-carbon and eco-friendly policies by reducing the use of petroleum-derived resources by using biomass, and to improve the bonding strength between biomass and ethylene vinyl acetate by a silane-based coupling agent, as well as to vegetable oil. It has a great meaning in that a foam composition having excellent mechanical properties can be obtained by stably foaming by controlling the fluidity of the composition.

The above description is merely illustrative of the technical spirit of the present invention, and those skilled in the art to which the present invention pertains will be able to make various modifications and variations without departing from the essential characteristics of the present invention. Therefore, the embodiments disclosed in the present invention are not intended to limit the technical spirit of the present invention, but to explain, and the scope of the technical spirit of the present invention is not limited by these embodiments. The protection scope of the present invention should be construed by the claims, and all technical ideas within the scope equivalent thereto should be construed as being included in the scope of the present invention.

Claims (4)

A foam composition comprising:
Including 50 to 90 parts by weight of ethylene vinyl acetate, 10 to 50 parts by weight of biomass, 1 to 5 parts by weight of a silane coupling agent, 1 to 10 parts by weight of vegetable oil, 1-3 parts by weight of a foaming agent and 1-3 parts by weight of a crosslinking agent. formed through foaming,
A foam composition for a shoe midsole using biomass, characterized in that the biomass and the ethylene vinyl acetate are interfacially bonded by reacting the biomass and the ethylene vinyl acetate with the silane-based coupling agent, respectively. According to claim 1,
The biomass is
A foam composition for shoe midsoles using biomass, characterized in that it is a powder formed by pulverizing at least one selected from the group consisting of grain husks, rice straw, corn stalks, barley stalks, rice husks, wood flour and starch. The method of claim 1,
The vegetable oil is
As one selected from the group consisting of olive oil, macadamia oil, sunflower seed oil, camellia oil, castor oil, jojoba oil, almond oil, apricot seed oil, green tea oil, meadowfoam seed oil, argan oil, and mixtures thereof, the foam composition A foam composition for a shoe midsole using biomass, characterized in that it controls the fluidity of the shoe. According to claim 1,
The silane-based coupling agent,
A foam composition for a shoe midsole using biomass, characterized in that it is a silane compound represented by the following formula (1).
[Formula 1]

(provided that R ₁ , R ₂ and R ₃ are a hydroxyl group, a C ₁ -C ₁₀ alkyl group, or a C ₁ -C ₁₀ alkoxy group, X is a single bond or a C ₁ -C ₁₀ alkylene group, Y is a mercap earthenware, amino group, vinyl group, methacryl group, methacryloxy group, epoxy group or glycidoxy.)

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