Summary of the invention
The technical problem that the present invention solves is to provide good plant fiber tableware of a kind of water resistance and preparation method thereof.
In view of this, the present invention provides a kind of preparation method of plant fiber tableware, comprising:
A), with raw material mix the back hot briquetting, obtain the string housing; Said raw material comprises that weight ratio is (5~6): (0.5~2): (2~4): 1 bamboo fibre powder, cornstarch, Lauxite and cavings;
B), to the processing of polishing of the surface of said string housing;
C), the string surface of shell after polishing sprays or the dip-coating water-based is unaware of the back oven dry, obtains plant fiber tableware.
Preferably, the particle diameter of said bamboo fibre is 40 orders~80 orders.
Preferably, said hot-forming temperature is 140 ℃~160 ℃.
Preferably, said hot-forming pressure is 10Mpa~20Mpa.
Preferably, said water-based paint vehicle comprises that weight ratio is 100: the bi-component waterborne lacquer and the water of (10~20), said bi-component waterborne enamel-cover is drawn together resin Composition and curing agent component.
Preferably, said water-based paint vehicle prepares according to following method:
Said resin Composition, curing agent component and water are mixed the back carry out stirring at low speed and high-speed stirred, obtain the water-based paint vehicle with this;
The speed of said stirring at low speed is 150rpm~200rpm, and the speed of high-speed stirred is 500rpm~600rpm.
Preferably, the temperature of said oven dry is 70 ℃~80 ℃.
Preferably, said raw material also comprises the color powder.
Preferably, also comprise before the step b: the step of the string housing being carried out the corner finishing.
Accordingly, the present invention also provides a kind of plant fiber tableware, comprising:
String housing and the water-based paint film that is overlying on said string surface of shell;
Said string housing comprises: weight ratio is that weight ratio is (4~6): (0.5~2): (2~4): 1 bamboo fibre powder, cornstarch, urea-formaldehyde resin powder and cavings.
The present invention provides a kind of preparation method of plant fiber tableware; This method is to be that raw material hot pressing prepares the string housing with bamboo fibre powder, cornstarch, cavings and Lauxite, then to string surface of shell polish back spraying or dip-coating water-based paint vehicle.In the raw material, the free formaldehyde that Lauxite produces in bamboo fibre powder and the cornstarch acting in conjunction absorption hot pressing, the bamboo fibre powder also helps to improve the hardness of string housing, avoids the string housing after japanning with before the drying, to deform.The cavings oil that contains in the cavings helps to increase the flowability of raw material in hot-briquetting modeling process, helps the moulding of raw material.After string surface of shell spraying water-based paint vehicle and oven dry, the string surface of shell forms one deck water-based paint film, and this water-based paint film can be isolated with string housing and external environment, improved the water resistance of tableware.For the plant fiber tableware of dyeing, under the protection of water-based paint film, the pigment on the string also is difficult for oozing out, and makes not fugitive color of product thus.
The specific embodiment
In order further to understand the present invention, below in conjunction with embodiment the preferred embodiment of the invention is described, describe just to further specifying feature and advantage of the present invention but should be appreciated that these, rather than to the restriction of claim of the present invention.
The embodiment of the invention discloses a kind of preparation method of plant fiber tableware, comprise the steps:
A), with raw material mix the back hot-forming, obtain the string housing; Said raw material comprises that weight ratio is (4~6): (0.5~2): (2~4): 1 bamboo fibre powder, cornstarch, urea-formaldehyde resin powder and cavings;
B), to the processing of polishing of the surface of said string housing;
C), behind the string surface of shell after polishing spraying or dip-coating water-based paint vehicle, dry, obtain plant fiber tableware.
Said method is to be raw material with bamboo fibre powder, cornstarch, cavings and Lauxite, and at first hot pressing forms housing, covers one deck water paint diaphragm at surface of shell then and makes tableware.Plant fiber tableware obtained by this method surface is covered with the water-based paint film, and under the protection of this water-based paint film, extraneous water is difficult for infiltrating in the string housing with other solvents, has improved the water resistance of tableware.
Step a is the process of preparation string housing, and this housing is a raw material with bamboo fibre powder, cornstarch, urea-formaldehyde resin powder and cavings.Lauxite is the polymer that urea and formolite reaction obtain, and it is used for firm being bonded to one of bamboo fibre powder, cornstarch and cavings as as binding agent.
Lauxite heating back is prone to produce free formaldehyde, and in order to reduce the content of free formaldehyde, the present invention adds bamboo fibre powder and cornstarch in raw material.The inventor finds: the absorption that bamboo fibre powder and cornstarch are used free formaldehyde has remarkable effect.For this reason, the present invention adds bamboo fibre powder and cornstarch in raw material, and controls the two weight ratio for (4~6): (0.5~2), reduce the content of free formaldehyde in the tableware thus, improve the security that tableware uses.The weight ratio of bamboo fibre powder and cornstarch more preferably 5: 1.
Simultaneously, the present invention selects the purpose of bamboo fibre powder also to be: it has higher hardness, and is not yielding.In follow-up spraying or dip-coating water-based paint vehicle process, the water-based paint vehicle contains small amount of moisture, and the product that the characteristic of bamboo fibre high rigidity makes the surface be covered with the water-based paint vehicle is difficult for taking place weak and limp distortion before oven dry, improve yield rate.The particle diameter of the bamboo fibre powder that the present invention adopts is preferably 40 orders~80 orders.
Cornstarch in the raw material can also be as dispersant except that being used to adsorb the free formaldehyde, and it is more even that raw material is disperseed.The effect that adds cavings in the raw material is: it contains cavings oil, and under hot pressing condition, cavings oil flows out from cavings is inner, increases the flowability of material, helps material forming.
Carry out hot pressing after above-mentioned raw materials mixed, just can obtain the string housing.In the hot pressing, it is 10MPa~20MPa, more preferably 12MPa~18MPa that pressure preferably is set.Temperature preferably is made as 140 ℃~160 ℃, more preferably 145 ℃~155 ℃.
Can make the string housing according to step a, but its resistance to water is relatively poor, the present invention need carry out surface finish successively to the string housing according to step b and step c and handle with japanning in order to improve the water resistance of tableware.
Wherein, Step b is the process of the string housing being carried out surface finish; The effect of polishing is to make string surface of shell smooth, helps that paint vehicle can be uniformly dispersed at the string surface of shell in the follow-up painting process, and improves the adhesive force of paint vehicle at surface of shell.
Before carrying out step b, the present invention also preferably carries out the string housing is carried out the step of corner finishing.The corner is revised and can be carried out according to method well known to those skilled in the art, concrete as: adopt trimmer or file that the corner of string housing is repaired.
According to step b the string housing is carried out the operation that just can paint after the surface finish, what the present invention selected to be easy to degrade sprays or dip-coating with the excellent water-based paint vehicle of security performance, more preferably adopts the water-based paint vehicle of food-grade.As preferred version, the water paint in the above-mentioned water-based paint vehicle preferably adopts the water paint of two components, promptly comprises resin Composition and curing agent component, and this water-based paint vehicle comprises that weight ratio is 100: the bi-component waterborne lacquer and the water of (10~20).Above-mentioned water paint has higher hardness of paint film, and moisture is controlled at 10%~20% purpose and is to make paint vehicle to have rate of drying faster, avoids moisture to infiltrate the distortion of feeling like jelly of housing that the string housing too much causes.The weight ratio of water and water paint is preferably (13~28) in the water-based paint vehicle: 100.
For the water-based paint vehicle of being processed by the bi-component waterborne lacquer, this water-based paint vehicle preferably forms according to following method configuration:
With carrying out stirring at low speed and high-speed stirred successively after said resin Composition, curing agent and the water mixing, obtain the water-based paint vehicle; Stirring at low speed speed is 150rpm~200rpm; The speed of high-speed stirred is 500rpm~600rpm.
Help avoiding the overreact in advance of resin and curing agent and influence the paint film mechanical property by slow extremely fast alr mode.
In spraying of string surface of shell or the laggard row oven dry of dip-coating water-based paint vehicle, the water evaporates in the drying course in the paint vehicle, paint vehicle solidify to form the water-based paint film, makes plant fiber tableware thus.
In order to give plant fiber tableware with particular color, raw material also preferably includes the color powder.Because this tableware surface is covered with the water-based paint film, therefore, the color powder is difficult in the string housing, infiltrating, and product is fugitive color not.
The plant fiber tableware that makes according to the method described above, its string housing and the equal degradable of water-based paint film after above-mentioned string meal arrives its service life, can carry out burying the soil degraded after the fragmentation with it and get final product.Therefore, this product convenient post-treatment environmental protection.
Can know that by such scheme the present invention is that raw material hot pressing prepares the string housing with bamboo fibre powder, cornstarch, cavings and Lauxite at first, spraying or dip-coating water-based paint vehicle after then the string surface of shell being polished.In the raw material, the free formaldehyde that Lauxite produces in bamboo fibre powder and the cornstarch acting in conjunction absorption hot pressing, the bamboo fibre powder also helps to improve the hardness of string housing, avoids the string housing after japanning with before the drying, to deform.The cavings oil that contains in the cavings helps to increase the flowability of raw material in hot-briquetting modeling process, helps the moulding of raw material.After string surface of shell spraying water-based paint vehicle and oven dry, the string surface of shell forms one deck water-based paint film, and this water-based paint film can be isolated with string housing and external environment, improved the water resistance of tableware.For the plant fiber tableware of dyeing, under the protection of water-based paint film, the pigment on the string also is difficult for oozing out, and makes not fugitive color of product thus.
The present invention also provides a kind of plant fiber tableware, and this tableware comprises: string housing and the water-based paint film that is overlying on said string surface of shell;
Above-mentioned string housing comprises: weight ratio is (4~6): (0.5~2): (2~4): 1 bamboo fibre powder, cornstarch, urea-formaldehyde resin powder and cavings.
This plant fiber tableware can be made by said method.
Above-mentioned plant fiber tableware includes but not limited to mess-tin, bowl and spoon.With the mess-tin is example, and the profile of this mess-tin plant fiber tableware is as shown in Figure 1, and this plant fibre snack box body comprises: string housing 1 and cover the water-based paint film 2 with said string housing 1 surface.
Plant fiber tableware provided by the invention has water resistance preferably, is difficult for the infiltration distortion in the use, and service life is longer.For the plant fiber tableware of dyeing, pigment is because the barrier effect of water-based paint film is difficult for oozing out so this product fugitive color not.While is owing to the housing and the equal degradable of paint film of this product, so this product post processing comparatively makes things convenient for environmental protection.
In order further to understand the present invention, below in conjunction with embodiment plant fiber tableware provided by the invention and preparation method thereof to be described, protection scope of the present invention is not limited by the following examples.
The water paint that following examples are used is the fertile bi-component waterborne lacquer W3000-2K that builds, and the proportioning of resin Composition and curing agent component (weight ratio) is 100: 8 during construction.
Embodiment 1
1, get 50kg bamboo fibre powder (50~60 order), 10kg cornstarch, 30kg urea-formaldehyde resin powder and 10kg cavings, pour heating and mould pressing moulding in the moulding press into after above-mentioned raw materials is mixed, heating-up temperature is made as 150, and pressure is made as 15MPa.After mold pressing was accomplished, divided mould was taken out the string housing.
2, the string housing that uses trimmer that step 1 is made carries out the corner finishing.
The surface polarity polishing of the string housing that 3, step 2 is obtained is handled, and is then that the dust cleaning of surface of shell is clean.
4, the resin Composition, curing agent component and the water that in mixer, add water paint; Amount of water is 15% of a water paint, carries out stirring at low speed and high-speed stirred then successively, and the speed of stirring at low speed is 175rpm; The speed of high-speed stirred is 550rpm, and stirring obtains the water-based paint vehicle after accomplishing.
5, the string surface of shell that obtains in step 3 evenly sprays the water-based paint vehicle of step 4 configuration.
6, the semi-finished product that step 5 obtained are sent in the electric heating drying tunnel and are dried, and bake out temperature is set to 80 ℃, and oven dry obtains plant fiber tableware after accomplishing.
Embodiment 2
1, get 60kg bamboo fibre powder (40~50 order), 5kg cornstarch, 25kg urea-formaldehyde resin powder, 10kg cavings, pour heating and mould pressing moulding in the moulding press into after above-mentioned raw materials is mixed, heating-up temperature is made as 140 ℃, and pressure is made as 10MPa.After mold pressing was accomplished, divided mould was taken out the string housing.
2, the string housing that uses trimmer that step 1 is made carries out the corner finishing.
The surface polarity polishing of the string housing that 3, step 2 is obtained is handled, and is then that the dust cleaning of surface of shell is clean.
4, the resin Composition, curing agent component and the water that in mixer, add water paint; Amount of water is 12% of a water paint, carries out stirring at low speed and high-speed stirred then successively, and the speed of stirring at low speed is 150rpm; The speed of high-speed stirred is 500rpm, and stirring obtains the water-based paint vehicle after accomplishing.
5, the string surface of shell that obtains in step 3 evenly sprays the water-based paint vehicle of step 4 configuration.
6, the semi-finished product that step 5 obtained are sent in the electric heating drying tunnel and are dried, and bake out temperature is set to 70 ℃, and oven dry obtains plant fiber tableware after accomplishing.
Embodiment 3
1, gets 40kg bamboo fibre powder (60~80 order), 10kg cornstarch, 40kg urea-formaldehyde resin powder, 10kg cavings and 5kg red color powder; Pour heating and mould pressing moulding in the moulding press into after above-mentioned raw materials mixed; Heating-up temperature is made as 160 ℃, and pressure is made as 18MPa.After mold pressing was accomplished, divided mould was taken out the string housing.
2, the string housing that uses trimmer that step 1 is made carries out the corner finishing.
The surface polarity polishing of the string housing that 3, step 2 is obtained is handled, and is then that the dust cleaning of surface of shell is clean.
4, the resin Composition, curing agent component and the water that in mixer, add water paint; Amount of water is 20% of a water paint, carries out stirring at low speed and high-speed stirred then successively, and the speed of stirring at low speed is 180rpm; The speed of high-speed stirred is 600rpm, and stirring obtains the water-based paint vehicle after accomplishing.
5, the string surface of shell that obtains in step 3 evenly sprays the water-based paint vehicle of step 4 configuration.
6, the semi-finished product that step 5 obtained are sent in the electric heating drying tunnel and are dried, and bake out temperature is set to 80 ℃, and oven dry obtains plant fiber tableware after accomplishing.
Place the pond immersion to take out after 2 hours the plant fiber tableware of embodiment 1~3 preparation, above-mentioned three plant fiber tablewares are not deliquescing distortion all.The plant fiber tableware of embodiment 3 preparations fades.
Can know that by The above results adopt the plant fiber tableware of provider's method preparation of the present invention to have comparatively excellent in water resistance ability, service life is longer.For the plant fiber tableware that has color, product is fugitive color not.
The explanation of above embodiment just is used for helping to understand method of the present invention and core concept thereof.Should be pointed out that for those skilled in the art, under the prerequisite that does not break away from the principle of the invention, can also carry out some improvement and modification to the present invention, these improvement and modification also fall in the protection domain of claim of the present invention.
To the above-mentioned explanation of the disclosed embodiments, make this area professional and technical personnel can realize or use the present invention.Multiple modification to these embodiment will be conspicuous concerning those skilled in the art, and defined General Principle can realize under the situation that does not break away from the spirit or scope of the present invention in other embodiments among this paper.Therefore, the present invention will can not be restricted to these embodiment shown in this paper, but will meet and principle disclosed herein and features of novelty the wideest corresponding to scope.