CN111117028A - High-density pearl cotton and preparation method thereof - Google Patents
High-density pearl cotton and preparation method thereof Download PDFInfo
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- CN111117028A CN111117028A CN201911154121.0A CN201911154121A CN111117028A CN 111117028 A CN111117028 A CN 111117028A CN 201911154121 A CN201911154121 A CN 201911154121A CN 111117028 A CN111117028 A CN 111117028A
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- 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
- C08J9/12—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 physical blowing agent
- C08J9/14—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 physical blowing agent organic
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- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
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- B29C44/00—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles
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- B29C44/50—Feeding the material to be shaped into an open space or onto moving surfaces, i.e. to make articles of indefinite length using pressure difference, e.g. by extrusion or by spraying
- B29C44/505—Feeding the material to be shaped into an open space or onto moving surfaces, i.e. to make articles of indefinite length using pressure difference, e.g. by extrusion or by spraying extruding the compound through a flat die
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- C08J9/0014—Use of organic additives
- C08J9/0023—Use of organic additives containing oxygen
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- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
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- 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
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- C08J2431/00—Characterised by the use of copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by an acyloxy radical of a saturated carboxylic acid, or carbonic acid, or of a haloformic acid
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Abstract
The invention relates to high-density pearl cotton and a preparation method thereof, wherein the preparation raw materials comprise the following components in parts by weight: 155 parts of polyethylene, 10-15 parts of modified VAE emulsion, 10-19 parts of titanate modified calcium carbonate, 1-3 parts of talcum powder and 1-3 parts of silane coupling agent; 10-20 parts of a mixed foaming agent; wherein the mixed foaming agent comprises a mixture of monoglyceride and butane, and the weight percentage of the monoglyceride in the total weight of the mixed foaming agent is less than or equal to 80 percent; the invention adopts monoglyceride and butane as mixed foaming agents, and can greatly reduce the consumption of butane, thereby reducing the butane concentration in production workshops, improving the production safety and reducing the production cost. Meanwhile, a certain amount of monoglyceride and butane gas are introduced to serve as foaming agents to prepare the high-density pearl cotton formula, and compared with common electrified pearl cotton, the high-density pearl cotton formula has higher hardness and bearing capacity, is not easy to compress and deform, and has better shockproof positioning effect.
Description
Technical Field
The invention belongs to the technical field of pearl cotton, and particularly relates to high-density pearl cotton and a preparation method thereof.
Background
EPE pearl cotton is a non-crosslinked closed-cell structure, is a high-foam polyethylene product which is extruded by using low-density polyethylene (LDPE) as a main raw material, is also called polyethylene foam cotton, and is a novel environment-friendly packaging material. Because the low-density polyethylene resin is formed by innumerable independent bubbles generated by physical foaming of the low-density polyethylene resin, the defects of fragility, deformation and poor recovery of common foaming glue are overcome, and the low-density polyethylene resin has the advantages of water resistance, moisture resistance, shock resistance, sound insulation, heat preservation, good plastic property, strong toughness, cyclic reconstruction, environmental protection, strong impact resistance and the like, and also has good chemical resistance.
The existing EPE pearl cotton material, especially the EPE pearl cotton sheet material, is very easy to break due to lightness and thinness, has no anti-skid function and has unsatisfactory use effect; therefore, the hardness, toughness and antiskid effect of the existing EPE pearl cotton sheet are difficult to meet the requirements of people on the strength, toughness and antiskid effect of EPE pearl cotton, the series of EPE pearl cotton sheets can influence the use of the pearl cotton, and the application range is greatly limited.
In view of the above technical problems, improvements are needed.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provides the high-density pearl wool which can produce high density, high shock resistance and high setting performance and the preparation method thereof.
In order to achieve the above purposes, the technical scheme adopted by the invention is as follows:
the high-density pearl cotton comprises the following raw materials in parts by weight: 155 parts of polyethylene, 10-15 parts of modified VAE emulsion, 10-19 parts of titanate modified calcium carbonate, 1-3 parts of talcum powder and 1-3 parts of silane coupling agent; 10-20 parts of a mixed foaming agent; wherein the mixed foaming agent comprises a mixture of monoglyceride and butane, and the weight percentage of the monoglyceride in the total weight of the mixed foaming agent is less than or equal to 80%.
As a preferred mode of the invention, the high-density pearl cotton comprises the following preparation raw materials in parts by weight: 100 parts of polyethylene, 10 parts of modified VAE emulsion, 10 parts of titanate modified calcium carbonate, 1 part of talcum powder, 1 part of silane coupling agent and 10 parts of mixed foaming agent; wherein the mixed foaming agent comprises a mixture of monoglyceride and butane, and the weight percentage of the monoglyceride in the total weight of the mixed foaming agent is less than or equal to 70%.
As a preferable mode of the invention, the preparation raw materials comprise the following components in parts by weight: 155 parts of polyethylene, 15 parts of modified VAE emulsion, 19 parts of titanate modified calcium carbonate, 3 parts of talcum powder, 3 parts of silane coupling agent and 20 parts of mixed foaming agent; the mixed foaming agent comprises a mixture of monoglyceride and butane, wherein the weight of monoglyceride accounts for less than or equal to 50% of the total weight of the mixed foaming agent.
In a preferred mode of the invention, the modified VAE emulsion comprises the following materials in parts by weight: 45-59 parts of VAE, 5-7 parts of polyvinyl alcohol, 15-20 parts of vinyl acetate, 1-4 parts of ammonium persulfate and 1-3 parts of potassium persulfate.
In a preferred mode of the invention, the modified VAE emulsion comprises the following materials in parts by weight: 45 parts of VAE, 5 parts of polyvinyl alcohol, 15 parts of vinyl acetate, 1 part of ammonium persulfate and 1 part of potassium persulfate.
In a preferred mode of the invention, the modified VAE emulsion comprises the following materials in parts by weight: 59 parts of VAE, 7 parts of polyvinyl alcohol, 20 parts of vinyl acetate, 4 parts of ammonium persulfate and 3 parts of potassium persulfate.
The preparation method of the high-density pearl wool comprises the following steps:
step one, material preparation, drying talcum powder and titanate modified calcium carbonate, sieving the dried talcum powder and titanate modified calcium carbonate with a sieve of 100-150 meshes, adding the dried talcum powder and titanate modified calcium carbonate into a high-speed mixer, stirring and mixing the talcum powder and the titanate modified calcium carbonate for 20 to 30 minutes at the temperature of 110-120 ℃ at the speed of 500-1000rpm, then adding a silane coupling agent, blending the mixture for 5 to 10 minutes at the speed of 1500-2000rpm, feeding the mixture into a granulator for granulation, controlling the particle size to be 0.2 to 0.3mm, and drying the mixture to obtain a mixture A for later;
pouring the weighed VAE, polyvinyl alcohol, vinyl acetate, ammonium persulfate and potassium persulfate into a reaction kettle together for mixing and heating, uniformly stirring, and preserving heat to prepare a modified VAE emulsion for later use;
step three, pouring the modified VAE emulsion obtained in the step two into a stirrer for heating and stirring, controlling the stirring speed at 15-20 r/min, and then adding the weighed mixed foaming agent into the stirrer for mixing with the modified VAE emulsion, heating and stirring to enable the mixture to be in powder particles with uniform size; obtaining a mixture B for later use;
pouring the weighed polyethylene into a stirrer, mixing and drying the polyethylene with the mixture A and the mixture B together, and drying for 15-30 minutes to obtain a dry mixture C for later use;
step (five), foaming, namely feeding the raw material of the dry mixture C uniformly mixed in the step (four) into a foaming machine at 10-15MPa, heating the raw material to a molten state at 275-320 ℃ in a plasticizing heating section, pumping the mixed foaming agent by a foaming agent pump at the same time, wherein the flow rate is 10-20g/min (based on 1kg of the raw material), the rotation speed of a screw is 100-170r/min, the temperature of the raw material is reduced to 150 ℃ in a molding heating section, the raw material is extruded from a die orifice, and the temperature of the die orifice is 145-175 ℃; manufacturing a pearl cotton sheet; foaming the high-temperature liquid polyethylene into a pore-shaped structure under the catalysis of the mixed foaming agent;
step six, cooling; cooling and shaping the sheet in the step (V) through a water-cooled cooling system, and extruding the cooled pearl cotton sheet from a model;
step seven, traction sizing; pulling out the pearl cotton sheet manufactured in the step (six) by a tractor, wherein the pulling speed is 5-8 m/min; shaping the sheet material by a shaping drum;
step eight, fusing, namely fusing the single-layer pearl cotton by using an air heater;
step (nine), extending; in a spreading machine, spreading the sheet under the pressure of 2.5-3 MPa;
step (ten), rolling; and rolling the formed sheet by a rolling machine to obtain a finished product.
In a preferred embodiment of the present invention, in the step (six), the cooling temperature of the water-cooled cooling system is 30 to 40 ℃.
As a preferable mode of the present invention, in the step (vi), the water-cooled cooling system includes a water-cooled machine, an all-aluminum water-cooled shaping drum, a cotton blowing extrusion die, a special machine head mandrel, and a press machine head.
In a preferred mode of the present invention, in the step (v), the specific steps of pumping the mixed foaming agent by the foaming agent pump are as follows: a certain amount of monoglyceride and butane are injected through a plunger type high-precision metering pump, temperature reduction and pressurization treatment are carried out on the rear half part of the charging barrel, and pressure relief and expansion are carried out after an opening film is extruded to form a cylindrical material with a plurality of bubbles.
The invention has the beneficial effects that:
1. the modified VAE emulsion is added into the pearl cotton, so that the connection stability of the pearl cotton can be improved, the surface charge of latex particles is increased in the reaction process, the mutual repulsion between the latex particles is enhanced, the mutual coalescence is reduced, and the system is stable;
2. the main raw materials adopted by the invention are polyethylene and titanate modified calcium carbonate which have excellent dispersibility and surface activity, and the titanate modified calcium carbonate is easier to be mixed with polyethylene under the action of the mixed solution A and the silane coupling agent, so that the polyethylene modified calcium carbonate has excellent antistatic capability and stable antistatic value. The interaction between polyethylene and titanate modified calcium carbonate is enhanced, and the mechanical properties of the pearl wool, such as impact strength, tensile strength, bending strength, elongation and the like, can be remarkably improved;
3. the invention adopts monoglyceride and butane as mixed foaming agents, and can greatly reduce the consumption of butane, thereby reducing the butane concentration in production workshops, improving the production safety and reducing the production cost. Meanwhile, a certain amount of monoglyceride and butane gas are introduced to serve as foaming agents to prepare a high-density type pearl cotton formula, and compared with common electrified pearl cotton, the high-density type pearl cotton formula has higher hardness and bearing capacity, is not easy to compress and deform and has better shockproof positioning effect;
4. according to the invention, the water-cooled cooling system is arranged, and the good cooling effect of the high-density pearl cotton is realized by utilizing the good cold transfer performance of the water-cooled machine and the all-aluminum water-cooled shaping drum;
5. by designing a special cotton blowing extrusion die, a special machine head core rod and a pressure machine head, the high-density pearl cotton is rapidly extruded, so that the extrusion effect and quality of a product are ensured, and the large-scale efficiency of the product is improved;
6. the single-layer pearl wool is melted by the hot air blower and then is compressed by the roller, so that the pearl wool compression device has the characteristics of good compression effect, firm adhesion and the like, and compared with the traditional fire compounding process, the butane gas removing process is simplified, and the inflammable risk in the fire compounding process is avoided;
7. the high-density pearl cotton is suitable for special shockproof positioning of electronic products, logistics and the like, and has higher hardness and bearing capacity compared with common electric pearl cotton, so that the high-density pearl cotton is not easy to compress and deform, better protects the products and prevents the products from being damaged;
8. according to the invention, by selecting the proper type and proportion of the mixed foaming agent and the components, the foaming agent in the foam holes can be exchanged with air as soon as possible on the premise of ensuring that the foam holes of the pearl cotton material are not collapsed and the product is not shrunk, so that the storage and curing process of the pearl cotton material is shortened. The prepared high-density pearl wool material has compact and uniform foam holes, and the product performance is good, such as good buffering and shockproof properties; the curing period required by the stabilization of the foam pores of the high-density pearl cotton is shortened.
Detailed Description
The following provides a detailed description of embodiments of the invention.
Example 1: the high-density pearl cotton comprises the following raw materials in parts by weight: 100 parts of polyethylene, 10 parts of modified VAE emulsion, 10 parts of titanate modified calcium carbonate, 1 part of talcum powder, 1 part of silane coupling agent and 10 parts of mixed foaming agent; wherein the mixed foaming agent comprises a mixture of monoglyceride and butane, and the weight percentage of the monoglyceride in the total weight of the mixed foaming agent is less than or equal to 70%.
In the invention, in a specific embodiment, the polyethylene can be polyethylene granules which are conventionally used for preparing the pearl cotton material in the field, and the melt index of the polyethylene granules which are generally used for preparing the pearl cotton material is 1.8-7 g/10 min; the polyethylene pellets may be the product available from sauter (arabia) FT4119, the product of the iran petrochemical 2420E02, the product of the Yangba 2420, the product of the Saebike 2023NN or the Dow product 450E.
In the invention, the monoglyceride is a product DMG-95 purchased from Hangzhou Fuchun food additive company Limited.
The high-density pearl wool can be obtained by the conventional method in the field, and is generally prepared by the following steps: and in an extrusion foaming machine, sequentially extruding, cooling, shaping, flattening, drawing and coiling the mixture of the raw materials by a die.
In the present invention, the extrusion foaming machine may be an extrusion foaming machine conventionally used in the art. The extrusion foaming machine is generally heated to raise the temperature, and then the mixture of the raw materials is added.
In the invention, the mixed foaming agent is generally prepared by simultaneously injecting monoglyceride and butane into an extrusion foaming machine set by adopting a plunger type high-precision metering pump according to a metering mode; the monoglyceride and the butane are used as the mixed foaming agent, so that the using amount of the butane can be greatly reduced, the butane concentration of a production workshop is reduced, the production safety is improved, and the production cost is reduced. Meanwhile, a certain amount of monoglyceride and butane gas are introduced to serve as foaming agents to prepare the high-density pearl cotton formula, and compared with common electrified pearl cotton, the high-density pearl cotton formula has higher hardness and bearing capacity, is not easy to compress and deform, and has better shockproof positioning effect.
The modified VAE emulsion comprises the following materials in parts by weight: 45 parts of VAE, 5 parts of polyvinyl alcohol, 15 parts of vinyl acetate, 1 part of ammonium persulfate and 1 part of potassium persulfate.
The modified VAE emulsion is added into the pearl cotton, so that the connection stability of the pearl cotton can be improved, the surface charge of latex particles is increased in the reaction process, the mutual repulsion between the latex particles is enhanced, the mutual coalescence is reduced, and the system is stable.
The main raw materials adopted by the invention are polyethylene and titanate modified calcium carbonate which have excellent dispersibility and surface activity, and the titanate modified calcium carbonate is easier to be mixed with polyethylene under the action of the mixed solution A and the silane coupling agent, so that the polyethylene modified calcium carbonate has excellent antistatic capability and stable antistatic value. The interaction between polyethylene and titanate modified calcium carbonate is enhanced, and the mechanical properties of the pearl wool, such as impact strength, tensile strength, bending strength, elongation and the like, can be obviously improved.
A preparation method of high-density pearl wool comprises the following steps:
step one, material preparation, drying 1 part of talcum powder and 10 parts of titanate modified calcium carbonate, sieving with a 100-fold 150-mesh sieve, adding into a high-speed mixer, stirring and mixing at the speed of 500-fold 1000rpm at the temperature of 110-fold 120 ℃ for 20-30min, then adding 1 part of silane coupling agent, blending at the speed of 1500-fold 2000rpm for 5-10min, sending into a granulator for granulation, controlling the particle size to be 0.2-0.3mm, and drying to obtain a mixture A for later use;
pouring 45 parts of weighed VAE, 5 parts of polyvinyl alcohol, 15 parts of vinyl acetate, 1 part of ammonium persulfate and 1 part of potassium persulfate into a reaction kettle together for mixing and heating, stirring uniformly, and then preserving heat to prepare modified VAE emulsion for later use;
pouring the modified VAE emulsion obtained in the step (II) into a stirrer for heating and stirring, controlling the stirring speed at 15-20 r/min, then adding 10 parts of weighed mixed foaming agent into the stirrer for mixing with the modified VAE emulsion, heating and stirring to enable the mixture to be in powder particles with uniform size; obtaining a mixture B for later use;
pouring 100 parts of weighed polyethylene into a stirrer, mixing and drying the polyethylene with the mixture A and the mixture B together, and drying for 15-30 minutes to obtain a dry mixture C for later use;
step (five), foaming, namely feeding the raw material of the dry mixture C uniformly mixed in the step (four) into a foaming machine at 10-15MPa, heating the raw material to a molten state at 275-320 ℃ in a plasticizing heating section, pumping the mixed foaming agent by a foaming agent pump at the same time, wherein the flow rate is 10-20g/min (based on 1kg of the raw material), the rotation speed of a screw is 100-170r/min, the temperature of the raw material is reduced to 150 ℃ in a molding heating section, the raw material is extruded from a die orifice, and the temperature of the die orifice is 145-175 ℃; manufacturing a pearl cotton sheet; foaming the high-temperature liquid polyethylene into a pore-shaped structure under the catalysis of the mixed foaming agent;
specifically, the concrete steps of pumping the mixed foaming agent by the foaming agent pump are as follows: a certain amount of monoglyceride and butane are injected through a plunger type high-precision metering pump, temperature reduction and pressurization treatment are carried out on the rear half part of the charging barrel, and pressure relief and expansion are carried out after an opening film is extruded to form a cylindrical material with a plurality of bubbles.
Step six, cooling; cooling and shaping the sheet in the step (V) through a water-cooled cooling system, and extruding the cooled pearl cotton sheet from a model; the cooling temperature of the water-cooled cooling system is 30-40 ℃.
Specifically, the water-cooled cooling system comprises a water-cooled machine, an all-aluminum water-cooled shaping drum, a cotton blowing extrusion die, a special machine head core rod and a pressure machine head; through designing the special cotton blowing extrusion die, the special machine head mandril and the pressure machine head, the quick extrusion of the high-density pearl cotton is realized, the extrusion effect and the quality of the product are ensured, and the large-scale efficiency of the product is improved.
The inner layer water cooling and air cooling of the pearl cotton sheet are combined, the outer layer cold air cooling is used for shaping, high surface flatness and the integral shaping structure of the sheet can be obtained to the maximum extent, the section foam holes of the shaped pearl cotton sheet are fine, dense, circular and uniform, the thickness error is less than 1/5 of that of a common sheet, and the shock resistance of the shaped pearl cotton sheet is 5-8 times higher than that of the common pearl cotton sheet.
The water-cooled cooling system provided by the invention achieves the purpose of generating various excellent performances such as higher density, shock resistance and the like of a foaming product; the density of the product produced by the high-density pearl wool can reach 17-160kg/m3, and the thickness is 4-12 mm; the shock resistance is 5-8 times higher than that of the common pearl cotton sheet.
Step seven, traction sizing; pulling out the pearl cotton sheet manufactured in the step (six) by a tractor, wherein the pulling speed is 5-8 m/min; and (5) passing the sheet through a shaping drum for shaping.
Step eight, fusing, namely fusing the single-layer pearl cotton by using an air heater; the single-layer pearl wool is melted through the air heater, and the roller is used for compressing the pearl wool, so that the pearl wool pressing machine has the characteristics of good compressing effect, firm adhesion and the like, simplifies the butane gas removing process compared with the traditional fire compounding process, and avoids the inflammable risk in the fire compounding process.
Step (nine), extending; in a spreading machine, spreading the sheet under the pressure of 2.5-3 MPa;
step (ten), rolling; and rolling the formed sheet by a rolling machine to obtain a finished product.
The high-density pearl cotton is suitable for special shockproof positioning of electronic products, logistics and the like, and has higher hardness and bearing capacity compared with common electric pearl cotton, so that the high-density pearl cotton is not easy to compress and deform, better protects the products and prevents the products from being damaged; by selecting proper types and proportions of the mixed foaming agent and components, the foaming agent in the foam holes can exchange with air as soon as possible on the premise of ensuring that the foam holes of the pearl cotton material do not collapse and the product does not shrink, so that the storage and curing process of the pearl cotton material is shortened. The prepared high-density pearl wool material has compact and uniform foam holes, and the product performance is good, such as good buffering and shockproof properties; the curing period required by the stabilization of the foam pores of the high-density pearl cotton is shortened.
Example 2:
the high-density pearl cotton comprises the following raw materials in parts by weight: 155 parts of polyethylene, 15 parts of modified VAE emulsion, 19 parts of titanate modified calcium carbonate, 3 parts of talcum powder, 3 parts of silane coupling agent and 20 parts of mixed foaming agent; the mixed foaming agent comprises a mixture of monoglyceride and butane, wherein the weight of monoglyceride accounts for less than or equal to 50% of the total weight of the mixed foaming agent.
The modified VAE emulsion comprises the following materials in parts by weight: 59 parts of VAE, 7 parts of polyvinyl alcohol, 20 parts of vinyl acetate, 4 parts of ammonium persulfate and 3 parts of potassium persulfate.
The high-density pearl wool in the embodiment 2 is prepared by the following steps:
step one, material preparation, namely drying 3 parts of talcum powder and 19 parts of titanate modified calcium carbonate, sieving the dried talcum powder and 19 parts of titanate modified calcium carbonate by a sieve with 100-150 meshes, adding the dried talcum powder and the titanate modified calcium carbonate into a high-speed mixer, stirring and mixing the talcum powder and the titanate modified calcium carbonate at the temperature of 110-120 ℃ at the speed of 500-1000rpm for 20-30min, then adding 3 parts of silane coupling agent, blending the mixture for 5-10min at the speed of 1500-2000rpm, feeding the mixture into a granulator for granulation, controlling the particle size to be 0.2-0.3mm, and drying the mixture;
step two, pouring 59 parts of weighed VAE, 7 parts of polyvinyl alcohol, 20 parts of vinyl acetate, 4 parts of ammonium persulfate and 3 parts of potassium persulfate into a reaction kettle together for mixing and heating, stirring uniformly, and then preserving heat to prepare modified VAE emulsion for later use;
pouring the modified VAE emulsion obtained in the step (II) into a stirrer for heating and stirring, controlling the stirring speed at 15-20 r/min, then adding 20 parts of weighed mixed foaming agent into the stirrer for mixing with the modified VAE emulsion, heating and stirring to enable the mixture to be in powder particles with uniform size; obtaining a mixture B for later use;
pouring 155 parts of weighed polyethylene into a stirrer, mixing and drying the polyethylene together with the mixture A and the mixture B for 15-30 minutes to obtain a dry mixture C for later use;
step (five), foaming, namely feeding the raw material of the dry mixture C uniformly mixed in the step (four) into a foaming machine at 10-15MPa, heating the raw material to a molten state at 275-320 ℃ in a plasticizing heating section, pumping the mixed foaming agent by a foaming agent pump at the same time, wherein the flow rate is 10-20g/min (based on 1kg of the raw material), the rotation speed of a screw is 100-170r/min, the temperature of the raw material is reduced to 150 ℃ in a molding heating section, the raw material is extruded from a die orifice, and the temperature of the die orifice is 145-175 ℃; manufacturing a pearl cotton sheet; foaming the high-temperature liquid polyethylene into a pore-shaped structure under the catalysis of the mixed foaming agent;
step six, cooling; cooling and shaping the sheet in the step (V) through a water-cooled cooling system, and extruding the cooled pearl cotton sheet from a model;
step seven, traction sizing; pulling out the pearl cotton sheet manufactured in the step (six) by a tractor, wherein the pulling speed is 5-8 m/min; shaping the sheet material by a shaping drum;
step eight, fusing, namely fusing the single-layer pearl cotton by using an air heater;
step (nine), extending; in a spreading machine, spreading the sheet under the pressure of 2.5-3 MPa;
step (ten), rolling; and rolling the formed sheet by a rolling machine to obtain a finished product.
Although the high-density pearl wool prepared in example 2 adopts the mixed foaming agent, the effect of the product is slightly poor due to the small proportion of monoglyceride, and shrinkage occurs.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention; thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. High density pearl cotton, its characterized in that: the preparation raw materials comprise the following components in parts by weight: 155 parts of polyethylene, 10-15 parts of modified VAE emulsion, 10-19 parts of titanate modified calcium carbonate, 1-3 parts of talcum powder and 1-3 parts of silane coupling agent; 10-20 parts of a mixed foaming agent; wherein the mixed foaming agent comprises a mixture of monoglyceride and butane, and the weight percentage of the monoglyceride in the total weight of the mixed foaming agent is less than or equal to 80%.
2. The high-density pearl wool according to claim 1, wherein: the preparation raw materials comprise the following components in parts by weight: 100 parts of polyethylene, 10 parts of modified VAE emulsion, 10 parts of titanate modified calcium carbonate, 1 part of talcum powder, 1 part of silane coupling agent and 10 parts of mixed foaming agent; wherein the mixed foaming agent comprises a mixture of monoglyceride and butane, and the weight percentage of the monoglyceride in the total weight of the mixed foaming agent is less than or equal to 70%.
3. The high-density pearl wool according to claim 1, wherein: the preparation raw materials comprise the following components in parts by weight: 155 parts of polyethylene, 15 parts of modified VAE emulsion, 19 parts of titanate modified calcium carbonate, 3 parts of talcum powder, 3 parts of silane coupling agent and 20 parts of mixed foaming agent; the mixed foaming agent comprises a mixture of monoglyceride and butane, wherein the weight of monoglyceride accounts for less than or equal to 50% of the total weight of the mixed foaming agent.
4. The high-density pearl wool according to claim 1, wherein: the modified VAE emulsion comprises the following materials in parts by weight: 45-59 parts of VAE, 5-7 parts of polyvinyl alcohol, 15-20 parts of vinyl acetate, 1-4 parts of ammonium persulfate and 1-3 parts of potassium persulfate.
5. The high-density pearl wool according to claim 4, wherein: the modified VAE emulsion comprises the following materials in parts by weight: 45 parts of VAE, 5 parts of polyvinyl alcohol, 15 parts of vinyl acetate, 1 part of ammonium persulfate and 1 part of potassium persulfate.
6. The high-density pearl wool according to claim 4, wherein: the modified VAE emulsion comprises the following materials in parts by weight: 59 parts of VAE, 7 parts of polyvinyl alcohol, 20 parts of vinyl acetate, 4 parts of ammonium persulfate and 3 parts of potassium persulfate.
7. A method for preparing high-density pearl wool according to any one of claims 1 to 6, wherein: the method comprises the following steps:
step one, material preparation, drying talcum powder and titanate modified calcium carbonate, sieving the dried talcum powder and titanate modified calcium carbonate with a sieve of 100-150 meshes, adding the dried talcum powder and titanate modified calcium carbonate into a high-speed mixer, stirring and mixing the talcum powder and the titanate modified calcium carbonate for 20 to 30 minutes at the temperature of 110-120 ℃ at the speed of 500-1000rpm, then adding a silane coupling agent, blending the mixture for 5 to 10 minutes at the speed of 1500-2000rpm, feeding the mixture into a granulator for granulation, controlling the particle size to be 0.2 to 0.3mm, and drying the mixture to obtain a mixture A for later;
pouring the weighed VAE, polyvinyl alcohol, vinyl acetate, ammonium persulfate and potassium persulfate into a reaction kettle together for mixing and heating, uniformly stirring, and preserving heat to prepare a modified VAE emulsion for later use;
step three, pouring the modified VAE emulsion obtained in the step two into a stirrer for heating and stirring, controlling the stirring speed at 15-20 r/min, and then adding the weighed mixed foaming agent into the stirrer for mixing with the modified VAE emulsion, heating and stirring to enable the mixture to be in powder particles with uniform size; obtaining a mixture B for later use;
pouring the weighed polyethylene into a stirrer, mixing and drying the polyethylene with the mixture A and the mixture B together, and drying for 15-30 minutes to obtain a dry mixture C for later use;
step (five), foaming, namely feeding the raw material of the dry mixture C uniformly mixed in the step (four) into a foaming machine at 10-15MPa, heating the raw material to a molten state at 275-320 ℃ in a plasticizing heating section, pumping the mixed foaming agent by a foaming agent pump at the same time, wherein the flow rate is 10-20g/min (based on 1kg of the raw material), the rotation speed of a screw is 100-170r/min, the temperature of the raw material is reduced to 150 ℃ in a molding heating section, the raw material is extruded from a die orifice, and the temperature of the die orifice is 145-175 ℃; manufacturing a pearl cotton sheet; foaming the high-temperature liquid polyethylene into a pore-shaped structure under the catalysis of the mixed foaming agent;
step six, cooling; cooling and shaping the sheet in the step (V) through a water-cooled cooling system, and extruding the cooled pearl cotton sheet from a model;
step seven, traction sizing; pulling out the pearl cotton sheet manufactured in the step (six) by a tractor, wherein the pulling speed is 5-8 m/min; shaping the sheet material by a shaping drum;
step eight, fusing, namely fusing the single-layer pearl cotton by using an air heater;
step (nine), extending; in a spreading machine, spreading the sheet under the pressure of 2.5-3 MPa;
step (ten), rolling; and rolling the formed sheet by a rolling machine to obtain a finished product.
8. The method for preparing high-density pearl wool according to claim 7, wherein the method comprises the following steps: in the step (VI), the cooling temperature of the water-cooled cooling system is 30-40 ℃.
9. The method for preparing high-density pearl wool according to claim 8, wherein the method comprises the following steps: in the step (VI), the water-cooled cooling system comprises a water-cooled machine, an all-aluminum water-cooled shaping drum, a cotton blowing extrusion die, a special machine head core rod and a pressure machine head.
10. The method for preparing high-density pearl wool according to claim 7, wherein the method comprises the following steps: in the step (V), the concrete steps of pumping the mixed foaming agent by the foaming agent pump are as follows: a certain amount of monoglyceride and butane are injected through a plunger type high-precision metering pump, temperature reduction and pressurization treatment are carried out on the rear half part of the charging barrel, and pressure relief and expansion are carried out after an opening film is extruded to form a cylindrical material with a plurality of bubbles.
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| CN112109304A (en) * | 2020-09-02 | 2020-12-22 | 安徽祥欣新材料科技有限公司 | Production process of environment-friendly pearl wool board |
| CN113334631A (en) * | 2021-06-08 | 2021-09-03 | 宿迁华拓新材料有限公司 | Production process of high-density environment-friendly flame-retardant pearl cotton |
| CN114292459A (en) * | 2022-01-17 | 2022-04-08 | 广东泓硕新材料科技有限公司 | High-density degradable pearl cotton and production process thereof |
| CN114752133A (en) * | 2022-06-01 | 2022-07-15 | 南通铭源新型环保材料有限公司 | Formula and preparation method of modified pearl wool |
| CN116199956A (en) * | 2022-02-25 | 2023-06-02 | 广东泓硕新材料科技有限公司 | Environment-friendly pearl cotton packaging material |
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