CN115093599A - Preparation method of light foaming slippers - Google Patents
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- CN115093599A CN115093599A CN202210793265.6A CN202210793265A CN115093599A CN 115093599 A CN115093599 A CN 115093599A CN 202210793265 A CN202210793265 A CN 202210793265A CN 115093599 A CN115093599 A CN 115093599A
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
- C08J9/04—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent
- C08J9/06—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent by a chemical blowing agent
- C08J9/10—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent by a chemical blowing agent developing nitrogen, the blowing agent being a compound containing a nitrogen-to-nitrogen bond
- C08J9/102—Azo-compounds
- C08J9/103—Azodicarbonamide
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- A—HUMAN NECESSITIES
- A43—FOOTWEAR
- A43D—MACHINES, TOOLS, EQUIPMENT OR METHODS FOR MANUFACTURING OR REPAIRING FOOTWEAR
- A43D25/00—Devices for gluing shoe parts
- A43D25/06—Devices for gluing soles on shoe bottoms
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- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
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- C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
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- C08J9/0023—Use of organic additives containing oxygen
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- C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
- C08J9/0061—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof characterized by the use of several polymeric components
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- C—CHEMISTRY; METALLURGY
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- C08J9/0066—Use of inorganic compounding ingredients
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- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
- C08J9/0095—Mixtures of at least two compounding ingredients belonging to different one-dot groups
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J11/00—Features of adhesives not provided for in group C09J9/00, e.g. additives
- C09J11/02—Non-macromolecular additives
- C09J11/04—Non-macromolecular additives inorganic
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J175/00—Adhesives based on polyureas or polyurethanes; Adhesives based on derivatives of such polymers
- C09J175/04—Polyurethanes
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2203/00—Foams characterized by the expanding agent
- C08J2203/04—N2 releasing, ex azodicarbonamide or nitroso compound
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2323/00—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers
- C08J2323/02—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers not modified by chemical after treatment
- C08J2323/04—Homopolymers or copolymers of ethene
- C08J2323/08—Copolymers of ethene
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- C08J2423/00—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers
- C08J2423/02—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers not modified by chemical after treatment
- C08J2423/16—Ethene-propene or ethene-propene-diene copolymers
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- C08K2201/011—Nanostructured additives
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Abstract
The invention discloses a preparation method of light foaming slippers, belonging to the technical field of shoemaking, wherein EVA resin, zinc oxide, stearic acid, talcum powder, a modifier and a foaming agent are kneaded, granulated and foamed to obtain shoe bodies and insoles; stirring and mixing polyether polyol, holocellulose fibers, a wetting agent, diphenylmethane diisocyanate, a foaming agent, a cross-linking agent and a catalyst, and performing injection foaming molding to obtain a supporting layer; bonding the shoe body, the supporting layer and the insole by using an adhesive, and pressing to prepare the light foamed slippers; the shoe body and the insole part are relatively soft in texture and comfortable to wear; the supporting layer is light in weight, so that the weight of the slippers is reduced; the adhesive has certain elasticity after being cured and has good adaptability with slipper materials; the holocellulose fibers have higher strength, so that the compressive strength of the supporting layer is increased, better support is provided for feet, and the possibility that the supporting layer is torn is reduced, so that the service life of the slippers is prolonged.
Description
Technical Field
The invention belongs to the technical field of shoemaking, and particularly relates to a preparation method of light foaming slippers.
Background
The sandals are the shoes necessary for consumers in summer, and the foaming slippers are lighter than the traditional slippers made of PVC materials and are the choice of more and more consumers. The first method is large-plate foaming, a plate is made first, and then is formed by steps of blanking, edging and the like, the cost of machine equipment is relatively low, and the method is adopted by general small-sized engineering; the second is mould pressing foaming, which is to put the material particles into a mould after weighing for foaming and forming, but the production efficiency is low and the leftover materials are more; the third is injection cross-linking foaming, which is the current mainstream technology, the process is that raw materials, auxiliary agents and the like are kneaded at high speed and then extruded for granulation, and then injection molding is carried out, and the size of a mold is only half of that of a finished product.
Common foaming slippers are prepared by adopting a mode of integrally foaming and molding materials such as EVA (vinyl acetate-ethylene copolymer) and the like, but the foaming hardness of the foaming slippers is not well controlled, the shoes made of the foaming slippers are uncomfortable to wear, and the feet are reduced in support due to the too soft foaming slippers, so that the flat feet are easily caused after the foaming slippers are worn for a long time; the slippers manufactured by adopting the composite manufacturing mode can have better wearing experience, but the slippers can be repeatedly bent in the wearing process, so that how to firmly bond different shoe materials is a main difficulty, and the service life of the slippers is prolonged. Therefore, a method for preparing light foaming slippers is needed.
Disclosure of Invention
The invention aims to provide a preparation method of light foamed slippers, which aims to solve the problems in the background art.
The purpose of the invention can be realized by the following technical scheme:
the light foaming slipper comprises a slipper body, an insole and a supporting layer, wherein the slipper body comprises a sole and a vamp which are integrally formed, the sole part is provided with a mounting groove, and the supporting layer is arranged in the mounting groove.
A preparation method of light foaming slippers comprises the following steps:
the method comprises the following steps: adding EVA resin, zinc oxide, stearic acid, talcum powder, a modifier and a foaming agent into an internal mixer for kneading, then extruding and granulating by using a double-screw extruder to obtain modified EVA particles, injecting the modified EVA particles into a corresponding mould by using an injection molding machine for cross-linking foaming molding, standing for 3-6h at the temperature of 40 ℃, and demolding to obtain a shoe body and an insole;
step two: adding polyether glycol into a flask, then adding holocellulose fiber and a wetting agent, stirring for 15-20mim under the condition of 500 plus 800r/min, then adding diphenylmethane diisocyanate, a foaming agent, a cross-linking agent and a catalyst, continuously stirring for 10-15min, then injecting into a mold by using an injection molding machine for cross-linking, foaming and molding, standing for 24-48h under the condition of 60 ℃, and demolding to obtain a supporting layer;
step three: coating a layer of adhesive with the thickness of 0.3-0.8mm at the bottom of the mounting groove of the shoe body, then placing the corresponding outline of the supporting layer into the mounting groove, coating a layer of adhesive with the thickness of 0.3-0.8mm on the surface of the supporting layer which is not contacted with the mounting groove after attaching, then placing the corresponding outline of the insole into the mounting groove to be attached with the supporting layer, and then pressing for 15-30min by using a pressing machine to prepare the light foaming slipper.
Further, in the first step, the dosage ratio of the EVA resin, the zinc oxide, the stearic acid, the talcum powder, the modifier and the foaming agent is 20 g: 1 g: 0.2 g: 18 g: 16 g: 3.1 g.
Further, in the second step, the dosage ratio of the polyether polyol, the holocellulose fiber, the wetting agent, the diphenylmethane diisocyanate, the foaming agent, the cross-linking agent and the catalyst is 40 g: 8 g: 3 g: 40 g: 1.2 g: 0.1-0.3 g: 0.6 g.
Further, the preparation method of the adhesive comprises the following steps: adding the EVA emulsion, the aqueous polyurethane emulsion, the propylene glycol and the distilled water into a flask, stirring for 15-20min under the condition of 1000r/min, then adding the wetting agent, the defoaming agent and the nano silicon dioxide, and continuously stirring for 20-30min to obtain the adhesive.
Further, the using ratio of the EVA emulsion to the aqueous polyurethane emulsion to the propylene glycol to the distilled water to the wetting agent to the defoaming agent to the nano-silica is 60-62 g: 80-82 g: 10-13 g: 35-45 g: 0.2-0.4 g: 0.2-0.3 g: 5-7 g.
Further, the modifier is ethylene propylene diene monomer.
Further, the blowing agent is azodicarbonamide.
Further, the cross-linking agent is triethanolamine.
Further, the catalyst was dibutyl tin dilaurate.
Further, the viscosity of the polyether polyol used in the second step is 5500. + -. 500 mPas.
Further, the EVA emulsion is purchased from Kyowa chemical Co., Ltd, Guangzhou, and has the model number of DA-102;
further, the polyurethane emulsion was purchased from New Material, Inc. of DAHUATAI, Anhui, under model number AH-1618.
Further, the wetting agent is a hydroxyl terminated polydimethylsiloxane available from Aijiaotai Silicone Ltd, Anhui.
Further, the defoaming agent is an organic silicon defoaming agent purchased from Shandong energy-gathering chemical Co.
Further, the preparation method of the holocellulose fiber comprises the following steps: adding bamboo powder and acetone into a flask, extracting for 3-4h under the condition of water bath at 60 ℃, removing substances such as lipid, pectin and the like in the bamboo powder, bleaching the extracted bamboo powder for 5-6 times by using a sodium hypochlorite solution with the mass fraction of 1% under the condition of 75 ℃, and dropwise adding a proper amount of acetic acid in the bleaching process to adjust the pH value to 4-5; performing suction filtration, washing filter residues after suction filtration with distilled water until the last washing liquid is neutral to obtain cellulose fibers; soaking cellulose fibers in 8% sodium hydroxide solution at 25-30 ℃ for 8-10h, heating to 90 ℃ for soaking for 2-3h, performing suction filtration, washing filter residues with distilled water until the last washing liquid is neutral, and removing heteropolysaccharide coexisting with the cellulose fibers to obtain the holocellulose fibers.
Further, bamboo powder was purchased from silicone mining ltd, high county.
The invention has the beneficial effects that:
the light slipper prepared by the invention comprises a slipper body, an insole and a supporting layer, wherein the slipper body and the insole are formed by EVA foaming through raw material selection and proportioning, the texture is relatively soft, the instep part does not feel foot wear, and the slipper is comfortable to wear; the supporting layer is formed by foaming polyurethane, and the apparent density is 55.3 +/-1.5 kg/m 3 The texture is lighter, the weight of the slipper is further reduced, and the slipper is more light to wear; the slippers adopt self-prepared adhesive in the preparation process, and the adhesive is water-based adhesive and is more environment-friendly; the glue contains EVA emulsion and aqueous polyurethane emulsion for proportioning, is similar to a slipper material, has certain elasticity after being cured, has good adaptability with the slipper material, is added with nano silicon dioxide, enables the adhesive to have moderate fluidity, is convenient for coating uniformly, enables the slipper to be firmly bonded through cohesion generated by the adhesive, and has better bonding effect; the supporting layer formed by foaming polyurethane contains holocellulose fibers, so that the compressive strength of the supporting layer is increased, better support is provided for feet, flat feet can be prevented, the holocellulose fibers have higher strength, the possibility that the supporting layer with lower apparent density is torn after the slipper is bent for a long time is reduced, and the service life of the slipper is prolonged.
Drawings
The invention will be further described with reference to the accompanying drawings.
FIG. 1 is a schematic cross-sectional view of a light foamed slipper of the present invention;
fig. 2 is a schematic view showing the structure of the installation groove part of the light weight slippers according to the present invention.
In the figure: 1. a sole; 11. mounting grooves; 2. a support layer; 3. shoe-pad; 4. an upper.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1-2, the light foaming slipper includes a soft slipper body, an insole 3 and a hard support layer 2, the slipper body includes a sole 1 and a vamp 4 which are integrally formed, the sole 1 is partially provided with an installation groove 11, the support layer 2 is arranged in the installation groove 11, and the attached slipper material is adhered by an adhesive.
Example 1
The preparation method of the light foamed shoe comprises the following steps:
a preparation method of light foaming slippers comprises the following steps:
the method comprises the following steps: 200g of EVA resin, 10g of zinc oxide, 2g of stearic acid, 180g of talcum powder, 160g of ethylene propylene diene monomer and 31g of azodicarbonamide are added into an internal mixer for kneading, then a double-screw extruder is used for extrusion and granulation to obtain modified EVA particles, the modified EVA particles are injected into a corresponding die by an injection molding machine for cross-linking foaming molding, standing is carried out for 3h at the temperature of 40 ℃, and demoulding is carried out to obtain a shoe body and an insole 3.
Step two: adding bamboo powder and acetone into a flask, extracting for 3h under the condition of water bath at 60 ℃, removing substances such as lipid, pectin and the like in the bamboo powder, bleaching the extracted bamboo powder for 5 times by using a sodium hypochlorite solution with the mass fraction of 1% under the condition of 75 ℃, and dropwise adding a proper amount of acetic acid in the bleaching process to adjust the pH value to 4; performing suction filtration, washing filter residues after suction filtration with distilled water until the last washing liquid is neutral to obtain cellulose fibers; soaking cellulose fibers in 8% sodium hydroxide solution at 25 ℃ for 8h, heating to 90 ℃ for soaking for 2h, performing suction filtration, washing filter residues with distilled water until the last washing liquid is neutral, and removing heteropolysaccharide coexisting with the cellulose fibers to obtain the holocellulose fibers.
Step three: adding 80g of polyether polyol into a flask, then adding 16g of holocellulose fiber and 6g of hydroxyl-terminated polydimethylsiloxane, stirring for 15 mm under the condition of 500r/min, then adding 80g of diphenylmethane diisocyanate, 2.4g of azodicarbonamide, 0.2g of triethanolamine and 1.2g of dibutyltin dilaurate agent, continuing stirring for 10min, then injecting into a mold by using an injection molding machine for crosslinking foaming molding, standing for 24h under the condition of 60 ℃, and demolding to obtain the supporting layer 2.
Step four: adding 60g of EVA emulsion, 80g of waterborne polyurethane emulsion, 10g of propylene glycol and 35g of distilled water into a flask, stirring for 15min under the condition of 1000r/min, then adding 0.2g of hydroxyl-terminated polydimethylsiloxane, 0.2g of organic silicon defoamer and 5g of nano-silica, and continuing stirring for 20min to obtain the adhesive.
Step five: coating a layer of adhesive with the thickness of 0.3mm at the bottom of a mounting groove 11 of a shoe body, then putting a supporting layer 2 into the mounting groove 11 corresponding to the contour, coating a layer of adhesive with the thickness of 0.3mm on one surface of the supporting layer 2 not contacting the mounting groove 11 after attaching, putting an insole 3 into the mounting groove 11 corresponding to the contour and attaching the insole 2, and then pressing for 15min by using a pressing machine to prepare the light foaming slipper.
Example 2
The preparation method of the light foamed shoe comprises the following steps:
a preparation method of light foaming slippers comprises the following steps:
the method comprises the following steps: 200g of EVA resin, 10g of zinc oxide, 2g of stearic acid, 180g of talcum powder, 160g of ethylene propylene diene monomer and 31g of azodicarbonamide are added into an internal mixer for kneading, then a double-screw extruder is used for extrusion and granulation to obtain modified EVA particles, the modified EVA particles are injected into a corresponding die by an injection molding machine for cross-linking foaming molding, standing is carried out for 5h at the temperature of 40 ℃, and demoulding is carried out to obtain the shoe body and the insole 3.
Step two: adding bamboo powder and acetone into a flask, extracting for 3.5h under the condition of water bath at 60 ℃, removing substances such as lipid, pectin and the like in the bamboo powder, bleaching the extracted bamboo powder for 5 times by using a sodium hypochlorite solution with the mass fraction of 1% under the condition of 75 ℃, and dropwise adding a proper amount of acetic acid in the bleaching process to adjust the pH value to 4.5; performing suction filtration, namely washing filter residues subjected to suction filtration with distilled water until the last washing liquid is neutral to obtain cellulose fibers; soaking cellulose fibers in 8% sodium hydroxide solution at 28 ℃ for 9h, heating to 90 ℃ for soaking for 2.5h, performing suction filtration, washing filter residues with distilled water until the washing liquid is neutral, and removing heteropolypolysaccharide coexisting with the cellulose fibers to obtain the holocellulose fibers.
Step three: adding 80g of polyether polyol into a flask, then adding 16g of holocellulose fiber and 6g of hydroxyl-terminated polydimethylsiloxane, stirring for 18 mm under the condition of 600r/min, then adding 80g of diphenylmethane diisocyanate, 2.4g of azodicarbonamide, 0.4g of triethanolamine and 1.2g of dibutyltin dilaurate agent, continuing stirring for 12min, then injecting into a mold by using an injection molding machine for crosslinking foaming molding, standing for 36h under the condition of 60 ℃, and demolding to obtain the supporting layer 2.
Step four: adding 61g of EVA emulsion, 81g of waterborne polyurethane emulsion, 12g of propylene glycol and 40g of distilled water into a flask, stirring for 18min under the condition of 1000r/min, then adding 0.3g of hydroxyl-terminated polydimethylsiloxane, 0.25g of organic silicon defoamer and 6g of nano-silica, and continuing stirring for 25min to obtain the adhesive.
Step five: coating a layer of adhesive with the thickness of 0.5mm at the bottom of a mounting groove 11 of a shoe body, then placing a supporting layer 2 into the mounting groove 11 corresponding to the contour, coating a layer of adhesive with the thickness of 0.5mm on one surface of the supporting layer 2 not contacting the mounting groove 11 after attaching, then placing an insole 3 into the mounting groove 11 corresponding to the contour and attaching the insole to the supporting layer 2, and then pressing the insole for 20min by using a pressing machine to prepare the light foaming slipper.
Example 3
The preparation method of the light foamed shoe comprises the following steps:
a preparation method of light foaming slippers comprises the following steps:
the method comprises the following steps: 200g of EVA resin, 10g of zinc oxide, 2g of stearic acid, 180g of talcum powder, 160g of ethylene propylene diene monomer and 31g of azodicarbonamide are added into an internal mixer for kneading, then a double-screw extruder is used for extrusion granulation to obtain modified EVA particles, the modified EVA particles are injected into a corresponding mould by an injection molding machine for cross-linking foaming molding, standing is carried out for 6h under the condition of 40 ℃, and demoulding is carried out to obtain the shoe body and the shoe pad 3.
Step two: adding bamboo powder and acetone into a flask, extracting for 4h under the condition of water bath at 60 ℃, removing substances such as lipid, pectin and the like in the bamboo powder, bleaching the extracted bamboo powder for 6 times by using a sodium hypochlorite solution with the mass fraction of 1% under the condition of 75 ℃, and dropwise adding a proper amount of acetic acid in the bleaching process to adjust the pH value to 5; performing suction filtration, namely washing filter residues subjected to suction filtration with distilled water until the last washing liquid is neutral to obtain cellulose fibers; soaking cellulose fibers in 8% sodium hydroxide solution at 30 ℃ for 10 hours, heating to 90 ℃ for soaking for 3 hours, performing suction filtration, washing filter residues with distilled water until the last washing liquid is neutral, and removing heteropolysaccharide coexisting with the cellulose fibers to obtain the holocellulose fibers.
Step three: adding 80g of polyether polyol into a flask, then adding 16g of holocellulose fiber and 6g of hydroxyl-terminated polydimethylsiloxane, stirring for 20 mm under the condition of 800r/min, then adding 80g of diphenylmethane diisocyanate, 2.4g of azodicarbonamide, 0.6g of triethanolamine and 1.2g of dibutyltin dilaurate agent, continuing stirring for 15min, then injecting into a mold by using an injection molding machine for crosslinking foaming molding, standing for 48h under the condition of 60 ℃, and demolding to obtain the supporting layer 2.
Step four: adding 62g of EVA emulsion, 82g of aqueous polyurethane emulsion, 13g of propylene glycol and 45g of distilled water into a flask, stirring for 20min under the condition of 1000r/min, then adding 0.4g of hydroxyl-terminated polydimethylsiloxane, 0.3g of organic silicon defoamer and 7g of nano silicon dioxide, and continuing stirring for 30min to obtain the adhesive.
Step five: coating a layer of adhesive with the thickness of 0.8mm at the bottom of a mounting groove 11 of a shoe body, then placing a supporting layer 2 into the mounting groove 11 corresponding to the contour, coating a layer of adhesive with the thickness of 0.8mm on one surface of the supporting layer 2 not contacting the mounting groove 11 after attaching, then placing an insole 3 into the mounting groove 11 corresponding to the contour and attaching the insole 2, and laminating for 30min by using a laminating machine to prepare the light foaming slipper.
Example 1-polyether polyol used in example 3 has a viscosity of 5500. + -.500 mPa · s; the apparent density of the prepared supporting layer 2 is 55.3 +/-1.5 kg/m 3 (ii) a The adhesive raw material EVA emulsion is purchased from Kyowa chemical Co., Ltd, Guangzhou, and has the model number of DA-102; the polyurethane emulsion is purchased from new materials, Inc. of DAHUATAI, Anhui, with model number AH-1618; hydroxyl terminated polydimethylsiloxanes were purchased from Aixita Silicone oil, Inc., Anhui; the organic silicon defoamer is purchased from Shandong energy-gathering chemical Co Ltd; bamboo powder was purchased from silicone mining ltd, high county.
Comparative example 1: on the basis of the embodiment 3, the holocellulose fiber is not added when the supporting layer 2 is prepared, and the slippers are prepared by the rest steps.
Comparative example 2: on the basis of the example 3, the adhesive for adhering the slippers is replaced by PU shoe repair glue purchased from the force group company Limited, and the slippers are prepared by the rest steps.
Performing performance tests on the example 1-the example 3, the comparative example 1 and the comparative example 2, bending different slippers for 1000 times by using a sole bending tester according to a bending angle of 90 degrees, setting the bending speed to be 80 times/min, and recording the test conditions; according to the raw material ratios of the slipper supporting layer 2 prepared in examples 1 to 3, comparative example 1 and comparative example 2, samples having a specification of 3 × 3 × 3 (unit: cm) and the same apparent density were foam-molded and cut, and the compression strength and the compression modulus of the different samples were measured at a speed of 2.5mm/min using a hydraulic universal mechanical tester, and the results were as shown in table 1 ("/" indicates no measurement):
TABLE 1
| Item | Example 1 | Example 2 | Example 3 | Comparative example 1 | Comparative example 2 |
| Slippers condition after bending test | Slight crease | Slight crease | Slight crease | Severe cracking | Slight splitting |
| Compressive Strength (kPa) | 468.3 | 468.5 | 468.6 | 381.7 | / |
| Compressive modulus (kPa) | 2313.4 | 2313.7 | 2314.0 | 1795 | / |
In comparative example 1, the slippers were severely ripped, and the surface of the support layer 2 was mainly torn. As can be seen from Table 1, the slippers prepared in examples 1-3 have no glue after being bent for 1000 times, and the shoe material of the support layer 2 has higher compression strength.
It should be noted that, in this document, terms such as "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (10)
1. A preparation method of the light foaming slippers is characterized by comprising the following steps:
the method comprises the following steps: kneading EVA resin, zinc oxide, stearic acid, talcum powder, modifier and foaming agent, granulating to obtain modified EVA particles, injecting the modified EVA particles into a corresponding mould for cross-linking foaming molding, standing for 3-6h at 40 ℃, and demoulding to obtain a shoe body and an insole (3);
step two: adding polyether glycol into a flask, then adding all-cellulose fiber and a wetting agent, stirring for 15-20mim, then adding diphenylmethane diisocyanate, a foaming agent, a cross-linking agent and a catalyst, continuously stirring for 10-15min, then injecting into a mold for cross-linking foaming molding, standing for 24-48h at 60 ℃, and demolding to obtain a support layer (2);
step three: coating a layer of adhesive with the thickness of 0.3-0.8mm on the bottom of a mounting groove (11) of a shoe body, then putting a supporting layer (2) into the mounting groove (11) corresponding to the contour, coating a layer of adhesive with the thickness of 0.3-0.8mm on one surface of the supporting layer (2) not contacting the mounting groove (11) after attaching, putting an insole (3) into the mounting groove (11) corresponding to the contour to attach the supporting layer (2), and pressing for 15-30min by a pressing machine to prepare the light foaming slipper.
2. The preparation method of the light foaming slippers as claimed in claim 1, wherein in the first step, the amount ratio of the EVA resin to the zinc oxide to the stearic acid to the talc to the modifier to the foaming agent is 20 g: 1 g: 0.2 g: 18 g: 16g of: 3.1 g.
3. The method for preparing the light foaming slippers according to claim 1, wherein in the second step, the polyether polyol, the holocellulose fiber, the wetting agent, the diphenylmethane diisocyanate, the foaming agent, the cross-linking agent and the catalyst are used in a ratio of 40 g: 8 g: 3 g: 40 g: 1.2 g: 0.1-0.3 g: 0.6 g.
4. The method for preparing a light foaming slipper as recited in claim 3, wherein the polyether polyol has a viscosity of 5500 ± 500 mPa-s.
5. The method for preparing a pair of light foamed slippers according to claim 1, wherein the adhesive is prepared by the following steps: adding the EVA emulsion, the aqueous polyurethane emulsion, the propylene glycol and the distilled water into a flask, stirring for 15-20min under the condition of 1000r/min, then adding the wetting agent, the defoaming agent and the nano silicon dioxide, and continuously stirring for 20-30min to obtain the adhesive.
6. The preparation method of the light foaming slippers according to claim 5, wherein the amount ratio of the EVA emulsion, the aqueous polyurethane emulsion, the propylene glycol, the distilled water, the wetting agent, the defoaming agent and the nano-silica is 60-62 g: 80-82 g: 10-13 g: 35-45 g: 0.2-0.4 g: 0.2-0.3 g: 5-7 g.
7. The preparation method of the light foaming slippers according to claim 1, wherein the preparation method of the holocellulose fiber comprises the following steps: adding bamboo powder and acetone into a flask, extracting for 3-4h under the condition of water bath at 60 ℃, bleaching the extracted bamboo powder for 5-6 times by using sodium hypochlorite solution at 75 ℃, and dropwise adding a proper amount of acetic acid in the bleaching process to adjust the pH value to 4-5; performing suction filtration, namely washing filter residues subjected to suction filtration with distilled water until the last washing liquid is neutral to obtain cellulose fibers; soaking cellulose fiber with sodium hydroxide solution at 25-30 deg.C for 8-10h, heating to 90 deg.C, soaking for 2-3h, vacuum filtering, washing the filter residue with distilled water until the last washing solution is neutral to obtain holocellulose fiber.
8. The method for preparing the light foaming slippers according to claim 1, wherein the modifier is ethylene propylene diene monomer.
9. The method for preparing a pair of light foamed slippers according to claim 1 wherein the foaming agent is azodicarbonamide.
10. The method for preparing the light foaming slippers according to claim 1, wherein the catalyst is dibutyl tin dilaurate.
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