阅读说明：本技术 一种新能源电机用阻燃槽楔的制备工艺及阻燃槽楔 (Preparation process of flame-retardant slot wedge for new energy motor and flame-retardant slot wedge ) 是由 狄宁宇 缪丽峰 凌斌 徐建刚 段斌嘉 章志华 于 2021-01-11 设计创作，主要内容包括：本发明提供一种新能源电机用阻燃槽楔的制备工艺,所述新能源电机用阻燃槽楔的制备工艺包括：配制胶黏剂、增强体在胶黏剂中浸渍和浸渍后的增强体引拔固化成型；所述胶黏剂由无卤氮系阻燃不饱和聚酯树脂与助剂混合制备而成；所述无卤氮系阻燃不饱和聚酯树脂由三聚氰胺改性功能化双酚A单体与酸酐反应而成。本发明使用无卤氮系阻燃不饱和聚酯树脂提高了槽楔的阻燃性能；由于采用引拔工艺,生产效率更高,成本相对较低；槽楔尺寸通过模具保证,稳定性更好,精度更高；由于槽楔生产过程表面未经加工,整体保持完整,其耐湿性能更好,不易分层,可靠性更好,同时也可减少加工废料产生,符合环保要求。(The invention provides a preparation process of a flame-retardant slot wedge for a new energy motor, which comprises the following steps: preparing an adhesive, dipping the reinforcement in the adhesive, and pulling and curing the dipped reinforcement for molding; the adhesive is prepared by mixing halogen-free nitrogen flame-retardant unsaturated polyester resin and an auxiliary agent; the halogen-free nitrogen-series flame-retardant unsaturated polyester resin is prepared by reacting melamine modified functionalized bisphenol A monomer with anhydride. The invention uses halogen-free nitrogen flame-retardant unsaturated polyester resin to improve the flame-retardant property of the slot wedge; because of adopting the drawing process, the production efficiency is higher and the cost is relatively lower; the size of the slot wedge is ensured by a die, so that the stability is better and the precision is higher; the surface of the slot wedge is not processed in the production process, so that the slot wedge is integrally kept, the moisture resistance is better, the slot wedge is not easy to delaminate, the reliability is better, the generation of processing waste can be reduced, and the slot wedge meets the requirement of environmental protection.)

1. A preparation process of a flame-retardant slot wedge for a new energy motor is characterized by comprising the following steps: the preparation process of the flame-retardant slot wedge for the new energy motor comprises the following steps: preparing an adhesive, dipping the reinforcement in the adhesive, and pulling and curing the dipped reinforcement for molding;

the adhesive is prepared by mixing halogen-free nitrogen flame-retardant unsaturated polyester resin and an auxiliary agent;

the halogen-free nitrogen-series flame-retardant unsaturated polyester resin is prepared by reacting melamine modified functionalized bisphenol A monomer with polybasic acid anhydride or polybasic isocyanate;

the structural formula of the melamine modified functional bisphenol A monomer is as follows:

the auxiliary agent is one or a combination of more of filler, coupling agent, diluent, special initiator for pultrusion, release agent, diluent and pigment.

2. The preparation process of the flame-retardant slot wedge for the new energy motor, according to claim 1, is characterized in that: the melamine modified functional bisphenol A monomer is synthesized by the following method: modifying a melamine intermediate: phenol: CF (compact flash)₃SO₃Stirring and reacting H-1: 3-8: 2-6 in a solvent A at the temperature of 20-60 ℃ for 4-12 hours, neutralizing with alkali after the reaction, extracting a product with a solvent B, and removing the solvent by rotary evaporation to obtain a crude product;

the structural formula of the melamine modified intermediate is as follows:

3. the preparation process of the flame-retardant slot wedge for the new energy motor, according to claim 2, is characterized in that: the melamine modified intermediate is synthesized by the following method: and (3) mixing pyruvic acid: SOCl₂Stirring and reacting the mixture 1: 1-3 in a mixed solvent of DMF and a solvent C at the temperature of 60-100 ℃ for 4-24 hours, and distilling at the temperature of 20-100 ℃ under reduced pressure or normal pressure to remove residual SOCl₂And (3) obtaining a solid, dissolving the solid in a solvent D, adding melamine with the molar ratio of 0.3-1 time to pyruvic acid, and carrying out reflux reaction at 60-120 ℃ for 1-6 hours to obtain a melamine modified intermediate.

4. The new energy motor as claimed in claim 2The preparation process of the flame-retardant slot wedge is characterized by comprising the following steps: the melamine modified intermediate, phenol, CF₃SO₃The molar ratio of H is 1: 3-5: 3.5 to 4.5.

5. The preparation process of the flame-retardant slot wedge for the new energy motor as claimed in claim 2 or 3, wherein the preparation process comprises the following steps: the solvent A is one or a combination of more of toluene, xylene, benzene, dichloromethane, trichloromethane, carbon tetrachloride, tetrahydrofuran, diethyl ether, diphenyl ether and cyclohexane; the solvent B is one or a combination of more of toluene, xylene, benzene, dichloromethane, chloroform, carbon tetrachloride, diphenyl ether, anisole, cyclohexane and n-hexane; the solvent C is one or a combination of more of toluene, xylene, benzene, dichloromethane, trichloromethane, carbon tetrachloride, tetrahydrofuran, diethyl ether, diphenyl ether and cyclohexane; the solvent D is one or a combination of more of toluene, xylene, benzene, dichloromethane, chloroform, carbon tetrachloride, tetrahydrofuran, diethyl ether, diphenyl ether and cyclohexane.

6. The preparation process of the flame-retardant slot wedge for the new energy motor, according to claim 1, is characterized in that: the halogen-free nitrogen-series flame-retardant unsaturated polyester resin is prepared by reacting melamine modified functionalized bisphenol A monomer, bisphenol A and anhydride.

7. The preparation process of the flame-retardant slot wedge for the new energy motor, according to claim 6, is characterized in that: the molar ratio of the melamine modified functional bisphenol A monomer to the bisphenol A is 0.1: 1-10: 1, and preferably 0.25: 1-3: 1.

8. The preparation process of the flame-retardant slot wedge for the new energy motor, according to claim 1, is characterized in that: the weight ratio of the reinforcement to the adhesive is 20: 80-80: 20, and preferably, the weight ratio is 52: 48-68: 32.

9. The preparation process of the flame-retardant slot wedge for the new energy motor, according to claim 1, is characterized in that: the weight ratio of the halogen-free nitrogen-series flame-retardant unsaturated polyester resin to the auxiliary agent is 50: 50-90: 10, preferably 60:40 to 70: 30.

10. The utility model provides a new forms of energy are fire-retardant slot wedge for motor which characterized in that: the flame-retardant slot wedge for the new energy motor is prepared by the preparation process of the flame-retardant slot wedge for the new energy motor, which is disclosed by claim 1.

Technical Field

The invention relates to a motor slot wedge, in particular to a preparation process of a flame-retardant slot wedge for a new energy motor and the flame-retardant slot wedge.

Background

The slot wedge is a device applied to a motor stator, can greatly reduce the no-load current and the no-load loss of the motor, obviously improve the efficiency of the motor and save electric energy; the temperature rise and the running noise of the motor are reduced, the service life of the motor is prolonged, and the running reliability of the motor is improved. At present, the slot wedge products of the motor are divided into 3240 epoxy plate distribution slot wedges, drawing slot wedges, magnetic slot wedges, organic silicon slot wedges, semiconductor slot wedges, 4330 die pressing slot wedges and diphenyl ether slot wedges, and can meet the requirements of various types and insulation grade motors.

For example, chinese patent publication No. CN104059359A discloses a high heat-resistant high-strength draw-draw wedge and a method for manufacturing the same, the draw wedge is composed of alkali-free glass fiber cloth, alkali-free glass fiber yarn and an adhesive, the total weight percentage of the alkali-free glass fiber cloth and the alkali-free glass fiber yarn is 66-70%, and the weight ratio of the adhesive is 30-34%; the adhesive consists of 85-87% of polyimide modified polyethylene resin, 1.5-2.0% of pultrusion initiator, 1.4-1.6% of release agent, 8.0-10.0% of filler, 0.8-1.0% of color paste and 0.5-0.8% of coupling agent. The slot wedge has excellent performance at high temperature by improving the adhesive, especially keeps higher bending strength and cleavage resistance at high temperature, and meets the operation requirement of the wind driven generator.

Compared with the common motor, the new energy automobile motor is limited by the packaging size, the used slot wedge has small size and high requirement on size precision, the slot wedge is subjected to high-frequency vibration for a long time, the mechanical strength of the slot wedge is also high, the moisture resistance is also high, and most importantly, due to the special use environment, the new energy motor puts high requirements on the flame retardance of the used slot wedge so as to improve the safety and reliability of the motor.

Because the fire resistance of the common drawing slot wedge is poor, in order to meet the fire resistance requirement of the slot wedge for the new energy automobile motor, the solution in the market at present is to adopt a glass cloth laminated board with fire resistance to carry out machining. However, the slot wedge manufactured by machining the laminated plate has the following disadvantages:

1. the slot wedge for the new energy automobile motor is small in size and thin in thickness, and the laminated board with the smaller thickness is generally unstable in thickness due to the problem of a manufacturing process, so that the processed slot wedge is extremely unstable in thickness;

2. the size precision control of machining and manufacturing is difficult, and particularly, the machining of products with extremely small sizes causes that the machined slot wedge is difficult to meet the requirements of new energy automobile motors on the size precision;

3. the machined slot wedge is damaged due to machining and polishing, the moisture resistance of the slot wedge is reduced, the integrity of the slot wedge is damaged, the mechanical strength is reduced, the layering phenomenon can occur in long-term high-frequency vibration, and the reliability of a motor is reduced;

4. the processing efficiency is low, and the production cost is higher.

Therefore, it is necessary to develop a flame retardant slot wedge for a new energy automobile motor.

Disclosure of Invention

The first purpose of the invention is to provide a preparation process of a flame-retardant slot wedge for a new energy motor, aiming at the defects in the prior art.

Therefore, the above purpose of the invention is realized by the following technical scheme:

a preparation process of a flame-retardant slot wedge for a new energy motor is characterized by comprising the following steps: the preparation process of the flame-retardant slot wedge for the new energy motor comprises the following steps: preparing an adhesive, dipping the reinforcement in the adhesive, and pulling and curing the dipped reinforcement for molding;

the adhesive is prepared by mixing halogen-free nitrogen flame-retardant unsaturated polyester resin and an auxiliary agent;

the halogen-free nitrogen-series flame-retardant unsaturated polyester resin is prepared by reacting melamine modified functionalized bisphenol A monomer with polybasic acid anhydride or polybasic isocyanate;

the structural formula of the melamine modified functional bisphenol A monomer is as follows:

the auxiliary agent is one or a combination of more of filler, coupling agent, diluent, special initiator for pultrusion, release agent, diluent and pigment.

While adopting the technical scheme, the invention can also adopt or combine the following technical scheme:

as a preferred technical scheme of the invention: the melamine modified functional bisphenol A monomer is synthesized by the following method: modifying a melamine intermediate: phenol: CF (compact flash)₃SO₃Stirring and reacting H-1: 3-8: 2-6 in a solvent A at the temperature of 20-60 ℃ for 4-12 hours, neutralizing with alkali after the reaction, extracting a product with a solvent B, and removing the solvent by rotary evaporation to obtain a crude product;

the structural formula of the melamine modified intermediate is as follows:

as a preferred technical scheme of the invention: the melamine modified intermediate, phenol, CF₃SO₃The molar ratio of H is 1: 3-5: 3.5 to 4.5.

As a preferred technical scheme of the invention: the reaction temperature is preferably 20-40 ℃, and the reaction time is preferably 4-6 hours.

As a preferred technical scheme of the invention: the solvent A is one or a combination of more of toluene, xylene, benzene, dichloromethane, chloroform, carbon tetrachloride, tetrahydrofuran, diethyl ether, diphenyl ether and cyclohexane.

As a preferred technical scheme of the invention: the solvent A is preferably dichloromethane.

As a preferred technical scheme of the invention: the solvent B is one or a combination of more of toluene, xylene, benzene, dichloromethane, chloroform, carbon tetrachloride, diphenyl ether, anisole, cyclohexane and n-hexane.

As a preferred technical scheme of the invention: the solvent B is preferably dichloromethane.

As a preferred technical scheme of the invention: and (2) using dichloromethane to react a crude product of the melamine modified functional bisphenol A monomer: and (3) passing the mixed solvent with the methanol ratio of 20-60: 1 through a silica gel column, and drying in vacuum at the temperature of 60-100 ℃ to obtain the pure melamine modified functional bisphenol A monomer.

As a preferred technical scheme of the invention: the ratio of dichloromethane to methanol is preferably 30-40: 1.

As a preferred technical scheme of the invention: the preferable temperature of vacuum drying is 60-80 ℃.

As a preferred technical scheme of the invention: the melamine modified intermediate is synthesized by the following method: and (3) mixing pyruvic acid: SOCl₂Stirring and reacting the mixture 1: 1-3 in a mixed solvent of DMF and a solvent C at the temperature of 60-100 ℃ for 4-24 hours, and distilling at the temperature of 20-100 ℃ under reduced pressure or normal pressure to remove residual SOCl₂And (3) obtaining a solid, dissolving the solid in a solvent D, adding melamine with the molar ratio of 0.3-1 time to pyruvic acid, and carrying out reflux reaction at 60-120 ℃ for 1-6 hours to obtain a crude melamine modified intermediate.

As a preferred technical scheme of the invention: the pyruvic acid and SOCl₂The molar ratio of melamine is 1: 1.2-1.5: 0.5 to 1.

As a preferred technical scheme of the invention: the reaction temperature is preferably 60-80 ℃, and the reaction time is preferably 6-8 hours.

As a preferred technical scheme of the invention: the distillation conditions are preferably 40-60 ℃ reduced pressure distillation or 80-100 ℃ atmospheric pressure distillation.

As a preferred technical scheme of the invention: the preferred refluxing temperature is 80-100 ℃, and the preferred refluxing time is 2-4 hours.

As a preferred technical scheme of the invention: the solvent C is one or a combination of more of toluene, xylene, benzene, dichloromethane, chloroform, carbon tetrachloride, tetrahydrofuran, diethyl ether, diphenyl ether and cyclohexane.

As a preferred technical scheme of the invention: the solvent D is one or a combination of more of toluene, xylene, benzene, dichloromethane, chloroform, carbon tetrachloride, tetrahydrofuran, diethyl ether, diphenyl ether and cyclohexane.

As a preferred technical scheme of the invention: and washing the crude melamine modified intermediate product with water, and drying with a drying agent to obtain the pure melamine modified intermediate product.

As a preferred technical scheme of the invention: the desiccant is one of sodium carbonate, calcium chloride, magnesium sulfate and magnesium carbonate, preferably sodium carbonate.

As a preferred technical scheme of the invention: the halogen-free nitrogen-series flame-retardant unsaturated polyester resin is prepared by reacting melamine modified functionalized bisphenol A monomer, bisphenol A and anhydride.

As a preferred technical scheme of the invention: the molar ratio of the melamine modified functional bisphenol A monomer to the bisphenol A is 0.1: 1-10: 1, and preferably 0.25: 1-3: 1. Under the condition of ensuring the bending strength of the slot wedge, the melamine modified functional bisphenol A monomer has active primary amino group, and can react with anhydride to generate amide, so that the crosslinking degree of the synthesized unsaturated polyester is increased to form a network structure.

The filler is selected from the common varieties in the field, such as talcum powder, barium sulfate and the like.

The coupling agent is selected from the varieties commonly used in the field, such as silane coupling agent, titanate coupling agent and the like.

The special initiator for pultrusion is selected from the varieties commonly used in the field, such as BPO.

The release agent is selected from the common varieties in the field, such as phosphate esters, stearate, triethanolamine oil and the like.

The diluent is selected from the varieties commonly used in the art, such as styrene. Preferably, the amount of styrene added is about 30-35% by weight of the resin.

The pigment can be directly added in powder or prepared into pigment paste and then added.

As a preferred technical scheme of the invention: the reinforcement is selected from glass fiber cloth and/or glass fiber roving.

As a preferred technical scheme of the invention: the weight ratio of the reinforcement to the adhesive is 20: 80-80: 20, and preferably, the weight ratio is 52: 48-68: 32.

As a preferred technical scheme of the invention: the weight ratio of the halogen-free nitrogen-series flame-retardant unsaturated polyester resin to the auxiliary agent is 50: 50-90: 10, preferably 60:40 to 70: 30.

As a preferred technical scheme of the invention: the drawing temperature is 180-200 ℃, and the drawing speed is 80-100 r/min.

The invention also aims to provide a flame-retardant slot wedge for a new energy motor, aiming at the defects in the prior art.

Therefore, the above purpose of the invention is realized by the following technical scheme:

the utility model provides a new forms of energy are fire-retardant slot wedge for motor which characterized in that: the flame-retardant slot wedge for the new energy motor is prepared by the preparation process of the flame-retardant slot wedge for the new energy motor.

Compared with the prior art, the invention has the following advantages:

the halogen-free nitrogen-system flame-retardant unsaturated polyester resin is used, the halogen-free nitrogen-system flame-retardant unsaturated polyester resin is copolymerized into unsaturated polycarbonate/polyurethane and other polyester resins by using a melamine modified functional bisphenol A monomer and/or bisphenol A and polybasic acid anhydride, polybasic isocyanate and the like, the melamine modified functional bisphenol A monomer contains melamine flame-retardant groups, and the nitrogen element content of the melamine modified functional bisphenol A monomer is more than 20%, so that the flame-retardant property of the slot wedge is improved, and the flame-retardant property of the slot wedge at least can reach the flame-retardant standard of UL 94-V1; because of adopting the drawing process, the production efficiency is higher and the cost is relatively lower; the size of the slot wedge is ensured by a die, so that the stability is better and the precision is higher; the surface of the slot wedge is not processed in the production process, so that the whole slot wedge is kept complete, the moisture resistance is better, the slot wedge is not easy to delaminate, the reliability is better, meanwhile, the generation of processing waste materials can be reduced, and the slot wedge meets the requirement of environmental protection; the melamine modified functional bisphenol A monomer contains hydroxyl and amino, so that the monomer can be subjected to condensation polymerization crosslinking reaction with carboxyl simultaneously, the prepared polyester resin has rich crosslinking network structures, the strength of the resin can be greatly improved, and the strength of the slot wedge can be additionally improved.

Detailed Description

The present invention is described in further detail with reference to specific examples.

Monomer Synthesis preparation examples

Example 1.1

The synthesis of the melamine modified intermediate comprises the following synthetic route:

8.8g of pyruvic acid and 14.3g of SOCl were sequentially added to the reaction vessel₂10 drops of DMF and 100mL of toluene were stirred at 80 ℃ for 6 hours. Vacuum distillation at 60 ℃ to remove residual SOCl₂. The remaining solid was dissolved in 100mL of toluene, and 12.6g of melamine was added, followed by mixing and reflux reaction at 100 ℃ for 3 hours. And after the reaction, washing the solid with water, and drying with sodium carbonate to obtain the melamine modified intermediate.

Example 1.2

The synthesis of the melamine modified functional bisphenol A monomer comprises the following synthetic route:

19.6g of a melamine-modified intermediate, 37.6g of phenol, 150mL of methylene chloride, and 60.0g of CF were sequentially charged in a reaction vessel₃SO₃H, reacting for 5 hours at room temperature. After the reaction, the reaction mixture was neutralized with sodium hydrogencarbonate and extracted with dichloromethaneAnd (3) obtaining the product. The crude product was purified with dichloromethane: 40 parts of methanol: 1, passing through a column, and drying in vacuum at 70 ℃ in a vacuum oven to obtain the pure melamine modified functional bisphenol A monomer.

¹Characteristic peaks of H NMR spectrum (500MHz, CDCl)₃)：

Melamine modified intermediate: δ 7.24(s, 1H), δ 6.79(s, 4H), δ 2.54(s, 3H)

Melamine modified functionalized bisphenol a monomer: δ is 9.16(s, 2H), δ is 7.24(s, 1H), δ is 7.07-7.52(m, 4H), δ is 6.79(s, 4H), δ is 6.60-6.70(m, 4H), δ is 1.53(s, 3H).

Resin preparation examples

Examples 2.1 to 2.6

In examples 2.1-2.6, the mixing ratio of the melamine modified functionalized bisphenol A monomer and the bisphenol A monomer is different, and the specific mixing ratio is shown in Table 1, and the specific operation steps are as follows:

(1) the melamine modified functional bisphenol A monomer and the bisphenol A monomer are mixed according to a certain proportion to be used as a mixed dihydric alcohol monomer. The specific mixing ratio is shown in Table 1.

(2) Mixing the following dihydric alcohol monomers: maleic anhydride: phthalic anhydride is used according to the ratio of 1.1-2.2: 1: adding 1 mol ratio into a reaction kettle, introducing nitrogen protective gas, performing polycondensation reaction at 190-210 ℃, and stopping reaction until the acid value reaches 40 +/-2 mg KOH.

Comparative example 2.1

In comparative example 2.1, the melamine modified functionalized bisphenol A monomer was used in an amount of 0 and the remaining operations were the same as in examples 2.1 to 2.6.

The halogen-free nitrogen-containing flame-retardant unsaturated polyester resins prepared in examples 2.1 to 2.6 and the unsaturated polyester resin prepared in comparative example 2.1 were subjected to flame-retardant performance evaluation using the flame-retardant performance evaluation standard of UL94 plastic material, and the results are shown in Table 1 below:

table 1

Referring to examples 2.2, 2.4 and 2.6, under the condition that the molar ratio of the mixed dihydric alcohol, the maleic anhydride and the phthalic anhydride is kept unchanged, the flame retardant performance of the halogen-free nitrogen-based flame retardant unsaturated polyester resin is enhanced along with the increase of the proportion of the melamine modified functional bisphenol A monomer;

referring to examples 2.3 and 2.4 and 2.5 and 2.6 respectively, under the condition of keeping the mole ratio of the melamine modified functional bisphenol A monomer to the bisphenol A monomer unchanged, the flame retardant performance of the halogen-free nitrogen-containing flame retardant unsaturated polyester resin is correspondingly enhanced along with the increase of the proportion of the mixed dihydric alcohol monomer.

Slot wedge preparation examples

Example 3.1

The production process of the flame-retardant slot wedge for the new energy motor comprises the steps of adhesive preparation, reinforcement impregnation in the adhesive, and reinforcement drawing, curing and molding after the impregnation.

Unless otherwise specified, all parts in the examples refer to parts by weight:

100 parts of the nitrogen-containing flame-retardant resin in the example 2.4 are put into a stirring kettle and stirred, and 2 parts of pigment paste, 2.5 parts of phosphate release agent, 35 parts of diluent (styrene), 2.1 parts of special initiator for pultrusion (BPO) and 1 part of silane coupling agent (KH550) are sequentially added and stirred for 30 minutes; and slowly adding 25 parts of talcum powder and 15 parts of barium sulfate to prepare the adhesive, and stirring for 2 hours.

And (2) assembling the alkali-free glass fiber on a creel of a drawing forming machine according to rules, soaking the alkali-free glass fiber in the adhesive after passing through a guide plate, and controlling the gluing speed at normal temperature through a speed regulating motor, wherein the speed is 100-120 r/min. And (4) after the gluing is finished, pulling, extruding, curing and molding the alkali-free glass fiber by a mold. The drawing temperature is controlled to be 180-200 ℃, and the drawing speed is 80-100 r/min.

The content of the alkali-free glass fiber in the finished slot wedge is 52%, and the content of the cured resin is 48%.

The finished product slot wedge is tested to have a flame retardant rating of UL94-V0 (3 mm).

In the following examples, the same detection standard was used unless otherwise specified.

Examples 3.2 to 3.3

The adhesive preparation and the flame retardant wedge drawing, curing and molding process were the same as in example 3.1, except that the nitrogen-containing flame retardant resin of example 2.4 was used instead of the nitrogen-containing flame retardant resin of example 2.2 and the nitrogen-containing flame retardant resin of example 2.6 in this order.

Comparative example 3.1

The adhesive preparation and the flame retardant wedge pull cure molding process were the same as in example 3.1, except that the nitrogen-containing flame retardant resin of example 2.4 was replaced with a conventional unsaturated polyester resin without the melamine modified functionalized bisphenol a monomer.

The flame retardant property, drawing process property, bending strength, etc. of the finished product slot wedges prepared in examples 3.1-3.3 and comparative example 3.1, respectively, are listed in table 2 below.

The flame retardant wedge prepared in the embodiment 3.1-3.3 has the advantages that the flame retardant performance, the drawing process performance and the bending strength are all enhanced compared with the wedge prepared from the common unsaturated polyester resin without the melamine modified functional bisphenol A monomer, and the bending strength is correspondingly enhanced along with the increase of the proportion of the melamine modified functional bisphenol A monomer.

TABLE 2

	Flame retardant properties	Drawing manufacturability	Bending strength
				Practice ofExample 3.1	V0	Good taste	462MPa
Example 3.2	V0	Good taste	553MPa
				Example 3.3	V1	Good taste	368MPa
Comparative example 3.1	No flame retardant property	Is preferably used	308MPa

The above-described embodiments are intended to illustrate the present invention, but not to limit the present invention, and any modifications, equivalents, improvements, etc. made within the spirit of the present invention and the scope of the claims fall within the scope of the present invention.