CN106142428A - A kind of cotton fiber composite extruding technique - Google Patents
A kind of cotton fiber composite extruding technique Download PDFInfo
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- CN106142428A CN106142428A CN201510188300.1A CN201510188300A CN106142428A CN 106142428 A CN106142428 A CN 106142428A CN 201510188300 A CN201510188300 A CN 201510188300A CN 106142428 A CN106142428 A CN 106142428A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/0005—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor using fibre reinforcements
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L1/00—Compositions of cellulose, modified cellulose or cellulose derivatives
- C08L1/02—Cellulose; Modified cellulose
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/0005—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor using fibre reinforcements
- B29C2045/0008—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor using fibre reinforcements the fibres being oriented randomly
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2201/00—Properties
- C08L2201/06—Biodegradable
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/14—Polymer mixtures characterised by other features containing polymeric additives characterised by shape
- C08L2205/16—Fibres; Fibrils
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- Organic Chemistry (AREA)
- Dry Formation Of Fiberboard And The Like (AREA)
Abstract
A kind of cotton fiber composite extruding technique, relates to one and utilizes vegetable material manufacturing forming process, mainly have four steps.Compared with prior art, the high ductibility producing when the high twist of this technology utilization cotton fiber composite and HTHP carries out extruding, the product elastic modelling quantity being manufactured by the present invention is high, bending strength is strong, internal bond strength is high, texture is excellent, density is suitable for, asepsis environment-protecting, capable of being fast degraded, surface compact is wear-resisting, the features such as plastic complicated shape, various performance parameters are much better than the product obtained by solid wood products and other plant composite materials, cost is then far below solid wood products and is not higher than other plant composite material products, general household furniture industry can not only be applicable to, can also be widely used in industrial production.
Description
Technical field
The present invention relates to one and utilize vegetable material manufacturing forming process, particularly relate to a kind of cotton fiber material manufacturing forming process.
Background technology
The applicant has applied for " preparation method of a kind of non-adhesive wood fiber part " (application number 201110411549.6) with other applicant's names, a kind of method that " shaped wooden mould pressing furniture part and manufacture method thereof " (application number 201010542653.4) etc. utilize wood-fibred Special-shaped moulded to be molded, the shaped piece of high-density high-strength can be produced by this method, this product can be widely used in light industry and upholstery, it is possible not only to produce wooden pen container by these methods, wooden washbowl, the products such as wooden water tumbler, piece of furniture and the household articles with intricate detail can also be produced.But apply the adhesive in string, powder, bits material are made to be urea-formaldehyde glue, MDI glue mostly at present, owing to MDI is methyl diphenylene diisocyanate based compound, there is certain toxicity, may result in moderate eye irritation and slight skin irritatin, can cause allergic, so there is potential safety hazard during production operation；Urea-formaldehyde glue then contains formaldehyde material, owing to formaldehyde is that a kind of carcinogen is relatively big so the product made exists potential safety hazard to mankind's harmfulness.The idea of present Environmental Safety sustainable development is rooted in the hearts of the people, especially general commodity and furniture are that people are daily to be wanted often in contact with the article arriving, safety non-toxic must be accomplished, if the adhesive of this kind of article contains noxious material, be difficult to be accepted by market and society.And do not use any adhesive directly to suppress string, powder, bits in " preparation method of a kind of non-adhesive wood fiber part " (application number 201110411549.6), but owing to most strings, powder, bits itself do not have ductility, the density making stampings cannot be uniform, allow easy manufacture faulty goods, do not meet quality requirement.
Cotton is natural soft, and skin contact is non-stimulated.Free from extraneous odour, pollution-free, without bleachinging and dyeing, without any additive, breath is fresh and clean, is green product definitely warm, healthy, environmental protection.The major-minor product of cotton has higher value, as described in forefathers " cotton whole body is all precious ".It is most important fibre crops, is again important oil crops, is also the cereal crops containing high protein, or weaving, fine chemical material and important strategic materials.Cotton fiber toughness, fibre strength, ductility and elasticity are better than weedtree fiber all greatly, and the especially sth. made by twisting curvature of cotton fiber is very high, is combined together and cotton fiber can be made very firm.If forming product by squeezing or compacting cotton fiber at high temperature under high pressure, then new product no matter hardness, toughness, moulding, resistance to water, the life-span is better than, for wood-fibred compacting or squeezing product out, being also advantageous over most of solid wood products all greatly, can be used not only for manufacturing daily household furniture item, moreover it is possible to be widely used in the various industrial products of manufacture.
Content of the invention
The present invention is directed to deficiency of the prior art, provide a kind of cotton fiber composite extruding technique, the high ductibility producing when utilizing high twist and the HTHP of cotton fiber composite carries out extruding, the product elastic modelling quantity being manufactured by the present invention is high, bending strength is strong, internal bond strength is high, texture is excellent, density is suitable for, asepsis environment-protecting, capable of being fast degraded, surface compact is wear-resisting, the features such as plastic complicated shape, various performance parameters are much better than the product obtained by solid wood products and other plant composite materials, cost is then far below solid wood products and is not higher than other plant composite material products, general household furniture industry can not only be applicable to, can also be widely used in industrial production.
In order to solve above-mentioned technical problem, the present invention is addressed by following technical proposals, a kind of cotton fiber composite extruding technique, it is characterized by include following step: step A): in parts by weight, by the starch of 6 parts-8 parts, 15 parts-25 parts water, the NaOH of 1 part-1.5 parts, the talcum powder of 2 parts-3 parts and 65 parts of-75 parts of cotton fibers after mixing, form cotton fiber composites；Step B): carrying out thermal softening process to described cotton fiber composite, thermal softening temperature, between 50 DEG C to 70 DEG C, makes described cotton fiber composite moisture content drop to less than 25% simultaneously；Step C): by push rod, described cotton fiber composite is squeezed in mold cavity, described cotton fiber composite is allowed to be full of mold cavity, it is airtight that squeezing completes relief mold cavity, then described mould to 120 DEG C is heated between 160 DEG C, when heating, after described cotton fiber composite solidifies in described mould endosexine, described mould fine motion is allowed to discharge the gas in described mold cavity, stop fine motion and heating when described mould type intracavity gas is completely exhausted out and makes external and internal pressure consistent, now described cotton fiber composite is fully cured formation product；Step D): separate front mould and the rear mold of described mould, take out described product.
nullIn technique scheme，In described step A，In parts by weight，By the starch described in 6 parts-8 parts、Water described in 15 parts-25 parts、Stirring after NaOH mixing described in 1 part-1.5 parts，Whipping temp is between 30 DEG C to 50 DEG C，Mixing time is between 1 minute to 3 minutes，Continue stirring 18 minutes to 22 minutes again between the temperature of 30 DEG C to 50 DEG C after each material is uniformly mixed，Until there is gelatinization reaction in described starch，Described starch stops stirring and cools down at least 10 minutes until arriving normal temperature after being pasted completely，The talcum powder described in 2 parts-3 parts is added after having cooled down，Then stir at least 5 minutes when at least 50 DEG C，Stop heating carrying out cooling down until being cooled to normal temperature after described talcum powder uniformly mixes，Cooling just obtains adhesive after terminating，Then described cotton fiber is dried，Described cotton fiber moisture content is made to be not higher than 1%，Then take the cotton fiber described in 65 parts-75 parts to mix with described adhesive，Stir at least 30 minutes until mixing，Just obtained described cotton fiber composite after mixing.
In technique scheme, in described step C, the frequency of described fine motion is between 3 seconds to 5 seconds, fine motion allows and produces the displacement of 0.05 millimeter to 0.1 millimeter between the front mould of described mould and rear mold, during fine motion, described push rod links with described mould, keeps push rod to described mould type cavity pressure.
In technique scheme, in described step C, before described cotton fiber composite is squeezed to mould, first in described mold cavity, smear demolding aids.
In technique scheme, in described step C, after described mould is heated, described push rod presses continuously and ensures cotton fiber composite not Hui Yi described in described mould.
In technique scheme, in described step C, in described step C, the heat time of described mould is between 5 minutes to 20 minutes.
The raw material of the cotton fiber composite in this technique is cotton fiber, and cotton fiber is compared weedtree fiber and then had certain ductility and a high sth. made by twisting curvature, and cotton fiber is compared wood-fibred and also had stronger toughness simultaneously.The adhesive raw materials of this cotton fiber composite inner is mainly starch, especially plant amylum, and plant amylum can be glutinous rice starch, cornstarch, sweet potato starch, rice starch etc., it is however generally that conventional glutinous rice starch.Having certain tack after plant amylum is swelling, most importantly starch can have pasty state slipping property after gelatinization, and the bonding using starch to carry out cotton fiber as the major ingredient of adhesive makes this material have great ductility.So during HTHP squeezes and suppress the shaping of this material, cotton fiber composite can rely on the high ductibility of self to move so that interiors of products consistent in density during squeezing.And cotton fiber itself has extremely strong sth. made by twisting curvature, and cotton fiber is corpus fibrosum very, it is at high temperature under high pressure, cotton fiber can be wound around combination voluntarily, this combination is the tensile strength that physical bond makes to have superelevation between cotton fiber, finally allows product have the internal bond strength of superelevation, hardness, toughness and abrasion resistance.Carrying out impact experiment to final products, density, when 1000kg/CBM, carries out freely falling body at 10 meters of height and drops, and structure is lossless, and surface detail is lossless；20 meters of height carry out freely falling body and drop, and structure is lossless, surface detail slight damage；40 meters of height carry out freely falling body and drop, and do not rupture, and surface detail damages.Its hardness completely outstripped the hardness of major part solid wood.
Work as starch, water, NaOH, talcum powder and cotton fiber after mixing, form cotton fiber composite after material moisture content between 20%-30%, need to carry out softening and being dried to cotton fiber composite before squeezing, softening temperature is between 50 DEG C-75 DEG C, and the moisture content of cotton fiber composite simultaneously to be controlled is below 25%, and the cotton fiber composite after now softening is easier to make for squeezing.Need during squeezing high-voltage high-speed in cotton fiber composite filling to mold cavity, no matter how many fillings will allow cotton fiber composite full and surface compact in mold cavity.Filling amount number mainly influence whether the characteristic such as the density of product and hardness after shaping, it is however generally that density is the bigger the better, and the product being actually molded at a low density has been provided with good physical characteristic.When temperature reaches 120 DEG C-160 DEG C, in cotton fiber composite, the starch after gelatinization will excite in denaturation, " flows ", promote each several part even density in mold cavity under mould inside pressure.When 100 DEG C-120 DEG C, cotton fiber itself has very high sth. made by twisting curvature, cotton fiber sliding extend when adjacent between cotton fiber can automatic winding, so significantly increase the internal bond strength of product.When mold cavity internal surface temperature reaches 130 DEG C-160 DEG C, cotton fiber composite layer starts solidification, and has only to hardening time about 5 seconds, and due to the factor of heat transfer, now the surface of product starts solidification, and inside is still in flow regime.It is accomplished by heating between 120 DEG C-160 DEG C at least 5 minutes-8 minutes if be fully cured.Owing to heating-up temperature is more than 100 DEG C, cotton fiber composite itself is aqueous, water in cotton fiber composite can become gas from liquid at this temperature, significantly increases the pressure in mold cavity, and product also can be therefore by generation pyrocondensation phenomenon during heat cure simultaneously.In order to solve pyrocondensation, still extending mould before and after mould is allowed to produce fine motion constantly the solidification of cotton fiber composite material surface is internal, allow and tiny gap occurs between before and after's mould, fine motion can be carried out once every 3 seconds and 6 seconds, the displacement of each fine motion is only between 0.05 millimeter to 0.1 millimeter, the effect of fine motion is to allow the steam effusion producing in mold cavity and release excess pressure while ensureing mould type cavity pressure, keeps mould inside pressure not fluctuate, stops the pyrocondensation of product.Effusion with the solidification of cotton fiber composite inner and steam, pressure in mold cavity can stablize lasting decline, when the pressure in mould is consistent with external atmosphere pressure, just explanation cotton fiber composite is fully cured and defines product, now just can stop fine motion and heating, open before and after's mould and take out product.
The density of this product can be between 700kg/CBM to 1400kg/CBM according to the amount of filling, and when density is at about 700kg/CBM, the internal bond strength of product is up to more than 1.2MPA, and internal bond strength increases with the increase of density.And this product is the product of totally nontoxic, any shape can be produced by squeezing technique, most of wood products, plant fiber products and wood plastic product can be replaced.Various household goods, such as desk, chair, infanette, carving ornaments etc. can also be widely used in.The physical characteristic of this product fine simultaneously, it is also possible to this product can be widely used in industry.
Compared with prior art, the high ductibility producing when the high twist of this technology utilization cotton fiber composite and HTHP carries out extruding, the product elastic modelling quantity being manufactured by the present invention is high, bending strength is strong, internal bond strength is high, texture is excellent, density is suitable for, asepsis environment-protecting, capable of being fast degraded, surface compact is wear-resisting, the features such as plastic complicated shape, various performance parameters are much better than the product obtained by solid wood products and other plant composite materials, cost is then far below solid wood products and is not higher than other plant composite material products, general household furniture industry can not only be applicable to, can also be widely used in industrial production.
Detailed description of the invention
Below in conjunction with detailed description of the invention, the present invention is described in further detail.
Embodiment 1, a kind of cotton fiber composite extruding technique, firstly the need of preparing cotton fiber composite, by the glutinous rice starch described in 70g, pure water described in 200g, the NaOH described in 13g put in beaker stir, whipping temp is 45 DEG C, mixing time 3 minutes so that each material uniformly mixes.Then between the temperature of 30 DEG C to 50 DEG C, stirring beaker is continued 20 minutes so that starch occurs gelatinization reaction.Starch stops heating after being pasted completely and stirs beaker and cool down at least 10 minutes, the talcum powder described in 26g is added in beaker again after having cooled down, then heat and stir at least 5 minutes, because all there is gelatinization reaction with glutinous rice starch in moisture now, after adding talcum powder, talcum powder does not react with water and is and gelatinized corn starch physical contact.After talcum powder uniformly mixes, beaker is cooled down, after being cooled to normal temperature, just obtain a kind of adhesive.Then taking the cotton fiber after 700g is dried to mix with adhesive vibrations, vibrations mixing has just obtained cotton fiber composite until mixing in 30 minutes after mixing.Then carry out thermal softening process to cotton fiber composite, thermal softening temperature, between 50 DEG C to 70 DEG C, makes cotton fiber composite moisture content drop to less than 25% simultaneously.Smear demolding aids in mold cavity, in mould auxiliary agent and adhesive NaOH effect under can effectively prevent cotton fiber composite and wall of die cavity from pasting.The squeezing of the cotton fiber composite high-pressure high speed after then utilizing push rod to soften, in mold cavity, allows described cotton fiber composite be full of mold cavity, and the amount of filling makes the density of final products reach 750kg/CBM.It is airtight that squeezing completes relief mold cavity, then described mould to 150 DEG C is heated, after heating 3 minutes, cotton fiber composite will solidify in mould endosexine, at this moment mould fine motion is allowed, the frequency of fine motion is between 3 seconds to 5 seconds, and fine motion allows and produces the displacement of 0.05 millimeter to 0.1 millimeter between the front mould of mould and rear mold, allows the gas in mold cavity discharge with excess pressure.During fine motion, described push rod links with described mould, keeps push rod to the pressure in described mold cavity.Stop fine motion and heating when mould type intracavity gas is completely exhausted out making external and internal pressure consistent, now described cotton fiber composite is fully cured formation product.The time of whole mould heating was at about 12 minutes.Simultaneously in whole heating process, push rod to press the cotton fiber composite not Hui Yi ensureing in mould continuously.After mould cooling, it is possible to open front mould and rear mold takes out product.Product density is 750kg/CBM, internal bond strength 1.35MPA, is more than 45 MPA as MOR during sheet material, and deformation rate of making moist is not more than 1%.
Embodiment 2, a kind of cotton fiber composite extruding technique, firstly the need of preparing cotton fiber composite, by the cornstarch described in 80g, pure water described in 250g, the NaOH described in 15g put in beaker stir, whipping temp is 45 DEG C, mixing time 3 minutes so that each material uniformly mixes.Then between the temperature of 30 DEG C to 50 DEG C, stirring beaker is continued 20 minutes so that starch occurs gelatinization reaction.Starch stops heating after being pasted completely and stirs beaker and cool down at least 10 minutes, the talcum powder described in 30g is added in beaker again after having cooled down, then heat and stir at least 5 minutes, because all there is gelatinization reaction with cornstarch in moisture now, after adding talcum powder, talcum powder does not react with water and is and gelatinized corn starch physical contact.After talcum powder uniformly mixes, beaker is cooled down, after being cooled to normal temperature, just obtain a kind of adhesive.Then taking the cotton fiber after 750g is dried to mix with adhesive vibrations, vibrations mixing has just obtained cotton fiber composite until mixing in 30 minutes after mixing.Then carry out thermal softening process to cotton fiber composite, thermal softening temperature, between 50 DEG C to 70 DEG C, makes cotton fiber composite moisture content drop to less than 25% simultaneously.Smear demolding aids in mold cavity, in mould auxiliary agent and adhesive NaOH effect under can effectively prevent cotton fiber composite and wall of die cavity from pasting.The squeezing of the cotton fiber composite high-pressure high speed after then utilizing push rod to soften, in mold cavity, allows described cotton fiber composite be full of mold cavity, and the amount of filling makes the density of final products reach 900kg/CBM.It is airtight that squeezing completes relief mold cavity, then described mould to 150 DEG C is heated, after heating 3 minutes, cotton fiber composite will solidify in mould endosexine, at this moment mould fine motion is allowed, the frequency of fine motion is between 3 seconds to 5 seconds, and fine motion allows and produces the displacement of 0.05 millimeter to 0.1 millimeter between the front mould of mould and rear mold, allows the gas in mold cavity discharge with excess pressure.During fine motion, described push rod links with described mould, keeps push rod to the pressure in described mold cavity.Stop fine motion and heating when mould type intracavity gas is completely exhausted out making external and internal pressure consistent, now described cotton fiber composite is fully cured formation product.The time of whole mould heating was at about 12 minutes.Simultaneously in whole heating process, push rod to press the cotton fiber composite not Hui Yi ensureing in mould continuously.After mould cooling, it is possible to open front mould and rear mold takes out product.Product density is 900kg/CBM, internal bond strength 1.63MPA, is more than 52 MPA as MOR during sheet material, and deformation rate of making moist is not more than 1%.
Embodiment 3, a kind of cotton fiber composite extruding technique, firstly the need of preparing cotton fiber composite, by the rice starch described in 50g, pure water described in 150g, the NaOH described in 10g put in beaker stir, whipping temp is 45 DEG C, mixing time 3 minutes so that each material uniformly mixes.Then between the temperature of 30 DEG C to 50 DEG C, stirring beaker is continued 20 minutes so that starch occurs gelatinization reaction.Starch stops heating after being pasted completely and stirs beaker and cool down at least 10 minutes, the talcum powder described in 20g is added in beaker again after having cooled down, then heat and stir at least 5 minutes, because all there is gelatinization reaction with rice starch in moisture now, after adding talcum powder, talcum powder does not react with water and is and gelatinized corn starch physical contact.After talcum powder uniformly mixes, beaker is cooled down, after being cooled to normal temperature, just obtain a kind of adhesive.Then taking the cotton fiber after 700g is dried to mix with adhesive vibrations, vibrations mixing has just obtained cotton fiber composite until mixing in 30 minutes after mixing.Then carry out thermal softening process to cotton fiber composite, thermal softening temperature, between 50 DEG C to 70 DEG C, makes cotton fiber composite moisture content drop to less than 25% simultaneously.Smear demolding aids in mold cavity, in mould auxiliary agent and adhesive NaOH effect under can effectively prevent cotton fiber composite and wall of die cavity from pasting.The squeezing of the cotton fiber composite high-pressure high speed after then utilizing push rod to soften, in mold cavity, allows described cotton fiber composite be full of mold cavity, and the amount of filling makes the density of final products reach 1000kg/CBM.It is airtight that squeezing completes relief mold cavity, then described mould to 150 DEG C is heated, after heating 3 minutes, cotton fiber composite will solidify in mould endosexine, at this moment mould fine motion is allowed, the frequency of fine motion is between 3 seconds to 5 seconds, and fine motion allows and produces the displacement of 0.05 millimeter to 0.1 millimeter between the front mould of mould and rear mold, allows the gas in mold cavity discharge with excess pressure.During fine motion, described push rod links with described mould, keeps push rod to the pressure in described mold cavity.Stop fine motion and heating when mould type intracavity gas is completely exhausted out making external and internal pressure consistent, now described cotton fiber composite is fully cured formation product.The time of whole mould heating was at about 12 minutes.Simultaneously in whole heating process, push rod to press the cotton fiber composite not Hui Yi ensureing in mould continuously.After mould cooling, it is possible to open front mould and rear mold takes out product.Product density is 1000kg/CBM, internal bond strength 1.85MPA, is more than 55 MPA as MOR during sheet material, and deformation rate of making moist is not more than 1%.
Embodiment 4, a kind of cotton fiber composite extruding technique, firstly the need of preparing cotton fiber composite, by the glutinous rice starch described in 700g, pure water described in 2000g, the NaOH described in 130g put in mixer stir, whipping temp is 50 DEG C, mixing time 3 minutes so that each material uniformly mixes.Then continue to stir 20 minutes in mixer between the temperature of 30 DEG C to 50 DEG C so that starch occurs gelatinization reaction.Starch stops heating after being pasted completely and stirs mixer and cool down at least 10 minutes, the talcum powder described in 260g is added in mixer again after having cooled down, then heat and stir at least 5 minutes, because all there is gelatinization reaction with glutinous rice starch in moisture now, after adding talcum powder, talcum powder does not react with water and is and gelatinized corn starch physical contact.After talcum powder uniformly mixes, mixer is cooled down, after being cooled to normal temperature, just obtain a kind of adhesive.Then taking the cotton fiber after 7000g is dried to mix with adhesive vibrations, vibrations mixing has just obtained cotton fiber composite until mixing in 45 minutes after mixing.Then carry out thermal softening process to cotton fiber composite, thermal softening temperature, between 50 DEG C to 70 DEG C, makes cotton fiber composite moisture content drop to less than 25% simultaneously.Smear demolding aids in mold cavity, in mould auxiliary agent and adhesive NaOH effect under can effectively prevent cotton fiber composite and wall of die cavity from pasting.The squeezing of the cotton fiber composite high-pressure high speed after then utilizing push rod to soften, in mold cavity, allows described cotton fiber composite be full of mold cavity, and the amount of filling makes the density of final products reach 1400kg/CBM.It is airtight that squeezing completes relief mold cavity, then described mould to 150 DEG C is heated, after heating 3 minutes, cotton fiber composite will solidify in mould endosexine, at this moment mould fine motion is allowed, the frequency of fine motion is between 3 seconds to 5 seconds, and fine motion allows and produces the displacement of 0.05 millimeter to 0.1 millimeter between the front mould of mould and rear mold, allows the gas in mold cavity discharge with excess pressure.During fine motion, described push rod links with described mould, keeps push rod to the pressure in described mold cavity.Stop fine motion and heating when mould type intracavity gas is completely exhausted out making external and internal pressure consistent, now described cotton fiber composite is fully cured formation product.The time of whole mould heating was at about 20 minutes.Simultaneously in whole heating process, push rod to press the cotton fiber composite not Hui Yi ensureing in mould continuously.After mould cooling, it is possible to open front mould and rear mold takes out product.Product density is 1400kg/CBM, internal bond strength 2.1MPA, is more than 60 MPA as MOR during sheet material, and deformation rate of making moist is not more than 1%.
The shape of product produced is determined by mold cavity, and product density is determined by the amount of filling.Owing to using the squeezing of push rod high-voltage high-speed, cotton fiber composite can fill in mold cavity after being filled into, even if mold cavity moulding is complicated again, cotton fiber composite also can perfect be molded.Use Jogging technology in heat curing process, stopped the pyrocondensation phenomenon in cotton fiber composite solidification process so that whole product is full and even density.Owing to the characteristic of cotton fiber itself makes the product manufacturing have very excellent physical characteristic, either internal bond strength, MOR, toughness, elastic modelling quantity, deformation rate of making moist are all very excellent, this product is also the product of a kind of totally nontoxic simultaneously, life production field can be widely used in, especially household furniture industry, moreover, the physical characteristic by this product fine can also be applied in industry.This production is simple, is suitable for large-scale production, can be widely used in various Living Industry field.
Claims (6)
1. a cotton fiber composite extruding technique, it is characterized by include following step: step A): in parts by weight, by the starch of 6 parts-8 parts, 15 parts-25 parts water, the NaOH of 1 part-1.5 parts, the talcum powder of 2 parts-3 parts and 65 parts of-75 parts of cotton fibers after mixing, form cotton fiber composites；Step B): carrying out thermal softening process to described cotton fiber composite, thermal softening temperature, between 50 DEG C to 70 DEG C, makes described cotton fiber composite moisture content drop to less than 25% simultaneously；Step C): by push rod, described cotton fiber composite is squeezed in mold cavity, described cotton fiber composite is allowed to be full of mold cavity, it is airtight that squeezing completes relief mold cavity, then described mould to 120 DEG C is heated between 160 DEG C, when heating, after described cotton fiber composite solidifies in described mould endosexine, described mould fine motion is allowed to discharge the gas in described mold cavity, stop fine motion and heating when described mould type intracavity gas is completely exhausted out making external and internal pressure consistent, now described cotton fiber composite is fully cured formation product；Step D): separate front mould and the rear mold of described mould, take out described product.
null2. a kind of cotton fiber composite extruding technique according to claim 1，It is characterized by，In described step A，In parts by weight，By the starch described in 6 parts-8 parts、Water described in 15 parts-25 parts、Stirring after NaOH mixing described in 1 part-1.5 parts，Whipping temp is between 30 DEG C to 50 DEG C，Mixing time is between 1 minute to 3 minutes，Continue stirring 18 minutes to 22 minutes again between the temperature of 30 DEG C to 60 DEG C after each material is uniformly mixed，Until there is gelatinization reaction in described starch，Described starch stops stirring and cools down at least 10 minutes until arriving normal temperature after being pasted completely，The talcum powder described in 2 parts-3 parts is added after having cooled down，Then stir at least 5 minutes when at least 50 DEG C，Stop heating carrying out cooling down until being cooled to normal temperature after described talcum powder uniformly mixes，Cooling just obtains adhesive after terminating，Then described cotton fiber is dried，Described cotton fiber moisture content is made to be not higher than 1%，Then take the cotton fiber described in 65 parts-75 parts to mix with described adhesive，Stir at least 30 minutes until mixing，Just obtained described cotton fiber composite after mixing.
3. a kind of cotton fiber composite extruding technique according to claim 1, it is characterized by, in described step C, the frequency of described fine motion is between 3 seconds to 5 seconds, fine motion allows and produces the displacement of 0.05 millimeter to 0.1 millimeter between the front mould of described mould and rear mold, during fine motion, described push rod links with described mould, keeps push rod to described mould type cavity pressure.
4. a kind of cotton fiber composite extruding technique according to claim 1, is characterized by, in described step C, before described cotton fiber composite is squeezed to mould, first smears demolding aids in described mold cavity.
5. a kind of cotton fiber composite extruding technique according to claim 1, it is characterized by, in described step C, after described mould is heated, described push rod presses continuously and ensures cotton fiber composite not Hui Yi described in described mould.
6. a kind of cotton fiber composite extruding technique according to claim 1, is characterized by, in described step C, the heat time of described mould is between 5 minutes to 20 minutes.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510188300.1A CN106142428B (en) | 2015-04-21 | 2015-04-21 | A kind of cotton fiber composite material extruding technique |
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| CN201510188300.1A CN106142428B (en) | 2015-04-21 | 2015-04-21 | A kind of cotton fiber composite material extruding technique |
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| CN106142428A true CN106142428A (en) | 2016-11-23 |
| CN106142428B CN106142428B (en) | 2019-07-23 |
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| CN201510188300.1A Active CN106142428B (en) | 2015-04-21 | 2015-04-21 | A kind of cotton fiber composite material extruding technique |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1199376A (en) * | 1968-01-24 | 1970-07-22 | Monsanto Co | Composite Structures |
| JPS61215026A (en) * | 1985-03-22 | 1986-09-24 | Shin Kobe Electric Mach Co Ltd | Manufacture of thermosetting resin molded article |
| CN103483841A (en) * | 2013-09-02 | 2014-01-01 | 天津瑞和塑料制品有限公司 | Wear-resistant waterproof anti-aging wood-plastic composite material and molding process thereof |
| CN103965515A (en) * | 2013-01-25 | 2014-08-06 | 上海杰事杰新材料(集团)股份有限公司 | Nature fiber/starch composite material and preparation method thereof |
-
2015
- 2015-04-21 CN CN201510188300.1A patent/CN106142428B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1199376A (en) * | 1968-01-24 | 1970-07-22 | Monsanto Co | Composite Structures |
| JPS61215026A (en) * | 1985-03-22 | 1986-09-24 | Shin Kobe Electric Mach Co Ltd | Manufacture of thermosetting resin molded article |
| CN103965515A (en) * | 2013-01-25 | 2014-08-06 | 上海杰事杰新材料(集团)股份有限公司 | Nature fiber/starch composite material and preparation method thereof |
| CN103483841A (en) * | 2013-09-02 | 2014-01-01 | 天津瑞和塑料制品有限公司 | Wear-resistant waterproof anti-aging wood-plastic composite material and molding process thereof |
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| CN106142428B (en) | 2019-07-23 |
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