CN106977810B

CN106977810B - Antibacterial chopping board and preparation process thereof

Info

Publication number: CN106977810B
Application number: CN201710241847.2A
Authority: CN
Inventors: 王乾宇
Original assignee: Individual
Current assignee: Individual
Priority date: 2017-03-20
Filing date: 2017-04-13
Publication date: 2020-04-28
Anticipated expiration: 2037-04-13
Also published as: CN106977810A

Abstract

The invention discloses an antibacterial chopping board and a preparation process thereof, and the key points of the technical scheme are that the antibacterial chopping board comprises a degradable antibacterial body and an anti-slip body coated on the edge of the antibacterial body, wherein the antibacterial body comprises the following components, by weight, 3-5 parts of bamboo charcoal, 5-10 parts of starch, 70-80 parts of degradable plastic and 2-6 parts of a first antibacterial agent; the degradable plastic is selected from degradable PP resin or degradable rice hull fiber synthetic resin. The antibiotic chopping board that sets up both has antibiotic effect, still has the degradable function simultaneously, is difficult for breeding the bacterium when using, and old and useless chopping board also can be very fast degradation simultaneously, and is little to the pollution of environment.

Description

Antibacterial chopping board and preparation process thereof

Technical Field

The invention relates to the field of kitchen supplies, in particular to an antibacterial chopping board and a preparation process thereof.

Background

Chopping boards, also known as chopping boards and chopping piers, are indispensable kitchen utensils for people to chop foods such as meat and vegetables, and most of the traditional chopping boards are wood chopping boards which have the advantages of nature, high density, no toxicity and corrosion resistance; the defects of heaviness, high water absorption, easy mildew and deterioration, low surface hardness, easy generation of cutter marks, scrap and slag removal, concave surface, easy moisture cracks of wood, dirt storage and collection, easy breeding of pathogenic microorganisms such as bacteria, mould and the like, food pollution and serious harm to human health. Meanwhile, the wide use of the wood chopping board requires that a large number of trees are cut down, the ecological environment is damaged, and the concept of low carbon and environmental protection is not met. Therefore, wood chopping boards have been used less and less.

The plastic chopping board is usually processed by an injection molding process, has the advantages of light weight, small water absorption, beautiful shape, small surface capillary pores, no moisture and cracking, no easy mildew, long service life and the like, and is popular with more and more people. However, since the plastic chopping boards are mostly made of polypropylene materials, when the plastic chopping boards are damaged after being used for a period of time, the plastic chopping boards need to be replaced by new ones, and the old chopping boards are slowly degraded under natural conditions after being discarded, so that the environmental pollution can be caused after long-term accumulation.

Disclosure of Invention

Aiming at the defects in the prior art, the invention aims to provide the antibacterial chopping board which can be quickly decomposed under natural conditions and has little pollution to the environment.

The technical purpose of the invention is realized by the following technical scheme:

an antibacterial chopping board comprises a degradable antibacterial body and an anti-slip body coated on the edge of the antibacterial body, wherein the antibacterial body comprises the following components, by weight, 3-5 parts of bamboo charcoal, 5-10 parts of starch, 70-80 parts of degradable plastic and 2-6 parts of a first antibacterial agent; the degradable plastic is selected from degradable PP resin or degradable rice hull fiber synthetic resin.

According to the technical scheme, the bamboo charcoal is charcoal which is prepared by firing alpine moso bamboos growing for more than three years at high temperature of nearly thousand degrees, has a loose and porous structure, fine and porous molecules, hard texture and strong adsorption capacity, can purify air, eliminate peculiar smell, absorb moisture, prevent mildew, inhibit bacteria and expel parasites, can remove moisture and sweat when contacting with a human body, promotes blood circulation and metabolism of the human body, relieves fatigue, and is widely applied to daily life after being scientifically refined and processed; because the carbon has countless pores, the carbon pores can effectively adsorb a part of suspended substances in the air, play roles in adsorbing, decomposing peculiar smell and deodorizing harmful chemical substances such as sulfide, hydride, methanol, benzene, phenol and the like, and simultaneously the pores of the bamboo charcoal can enhance the connection strength between the bamboo charcoal and the material and improve the structural strength of the material; the arranged starch is characterized in that on one hand, the starch has degradability, and on the other hand, the molten starch has certain viscosity, so that the bonding strength among the components can be enhanced; the degradable plastic can be used for selectively degrading PP resin and rice hull fiber synthetic resin, the degradable PP resin material has good degradability compared with the PP resin, the degradation speed is high, meanwhile, the bamboo charcoal is arranged to increase the degradation speed of the PP resin, and then the degradable rice hull fiber synthetic resin is more environment-friendly, easy to degrade, stable in quality and low in cost; then the added antibacterial agent can endow the antibacterial chopping board with excellent antibacterial property, can inhibit or even kill pathogenic microorganisms, and is safer when in use.

The invention is further configured to: the anti-skid body comprises 70-80 parts by weight of PP and/or PE, 2-6 parts by weight of a second antibacterial agent and 5-10 parts by weight of starch.

Through above-mentioned technical scheme, the antiskid body that sets up can strengthen the chopping board and place the frictional force between the platform, it is inconvenient to avoid the cutting that the chopping board was released to slide and was caused when the cutting to a certain extent, then the material of the antiskid body that sets up is PP and/or PE, and can and antibiotic body between fine adhesion, then still including the second antibacterial agent in the antiskid body, the second antibacterial agent also can play antibacterial effect, reduce bacterial microorganism and breed on the chopping board, the starch of setting can strengthen the viscidity between PP and/or the PE equally, give the certain viscidity of antiskid body equally, then the antiskid body just can bond firmly on antibiotic body, the starch that sets up simultaneously reduces PP and/or PE's use as the filler, then the degradation performance of antiskid body just strengthens.

The invention is further configured to: the first antibacterial agent and the second antibacterial agent are both selected from acidic nano zinc oxide.

Through the technical scheme, the first antibacterial agent and the second antibacterial agent are selected from acidic nano zinc oxide, the antibacterial performance of the nano zinc oxide under the acidic condition is stronger, the zinc oxide selected from the nano particles has higher surface activity and larger specific surface area, the area of contact and reaction with bacteria is increased, the nano zinc oxide can be dispersed in the components more uniformly under the action of the bamboo charcoal, meanwhile, the bamboo charcoal can adsorb fine nano zinc oxide particles, the nano zinc oxide particles are firmly adhered, and the antibacterial effect is more durable.

The invention is further configured to: the degraded PP resin comprises the following preparation processes,

step 1, directly adding inorganic filler calcium carbonate, talcum powder and polyethylene low-molecular wax into PP resin, mixing by a high-speed mixer, plasticating and granulating by a double-screw extruder to obtain PP resin master batches, and controlling the temperature of the extruder at 200-220 ℃;

step 2, directly adding starch and polyethylene low-molecular wax into PP resin, mixing by a high-speed mixer, plasticating and granulating by a double-screw extruder to obtain degraded master batch;

and 3, uniformly mixing the PP resin master batch and the degradation master batch according to the weight part ratio of 10: 1.

Through the technical scheme, the PP resin comprises the PP resin master batch and the degradation master batch, so that the structural strength can be ensured, and the PP resin also has excellent degradation performance.

The invention is further configured to: the synthetic resin for degrading the rice hull fiber comprises the following preparation processes,

a. weighing 50-70 parts of rice hulls according to parts by weight, and grinding the rice hulls into 100-200 meshes of micro-particle rice hull powder;

b. b, putting the rice hull powder obtained in the step a into a high-temperature high-speed mixer, adding 10-25 parts by weight of cellulose and 10-35 parts by weight of starch, uniformly mixing, adding 10-35 parts by weight of PP in the mixing process, taking out, and cooling to obtain rice hull fiber powder;

c. putting 15-35 parts by weight of natural resin and 65-85 parts by weight of lignin into a reaction kettle, adding 10-20 parts by weight of PP into the kettle, uniformly stirring to form slurry, heating to 100-300 ℃, adding 5-15 parts by weight of nano silicon dioxide, continuously stirring uniformly, cooling the kettle to below 120 ℃, adding 30-7 parts by weight of rice hull fiber powder, continuously stirring, uniformly stirring, cooling, and taking out to prepare a pasty material;

d. c, directly injecting the pasty material obtained in the step c into a flash evaporation dryer, controlling the temperature of hot air to be 60-120 ℃ in the drying process, discharging when the water content is 5-15%, and preparing brown yellow rice hull fiber synthetic resin powder;

e. and d, cooling the rice hull fiber synthetic resin powder in the step d, and packaging and storing.

According to the technical scheme, the rice hull fiber powder can be coated by the PP added into the prepared rice hull fiber, so that the synthetic resin has certain waterproof performance, and bacterial microorganisms are not easy to breed in the using process.

The invention is further configured to: the temperature of the mixer in the step 2 is 30-35 ℃.

Through above-mentioned technical scheme, the temperature sets up melting of the little part that can be preliminary in this scope, then can make preliminary cross-linking between the component, and partial cross-linking just can avoid the rice husk powder to fly apart in mixing process.

The invention is further configured to: and c, selecting at least one of edible gelatin and hydrogenated rosin as the natural resin in the step c.

Through above-mentioned technical scheme, edible gelatin, hydrogenated rosin homoenergetic enough play the sticky effect, so just so can be so that the cross-linking of degradation rice husk fiber synthetic resin is inseparable.

The invention also aims to provide a preparation process of the antibacterial chopping board, which comprises the following preparation steps:

step A: weighing 3-5 parts of bamboo charcoal, 5-10 parts of starch, 70-80 parts of degradable plastic and 2-6 parts of antibacterial agent according to parts by weight, sequentially adding into a plastic injection molding machine, heating the temperature of the injection molding machine to 200-210 ℃, fully dissolving the components, injecting into a chopping board die through the injection molding machine, injection molding to form an antibacterial body, and taking out the antibacterial body after the die is cooled;

and B: b, placing the antibacterial body in the step A on a chopping board cooling and pressing device for cooling;

and C: and B, placing the antibacterial body cooled in the step B on an injection molding machine, adding 70-80 parts by weight of PP or PE, 2-6 parts by weight of an antibacterial agent and 5-10 parts by weight of starch into a hopper of the injection molding machine, heating at the temperature of 200-210 ℃, extruding to form an anti-slip body coated on the antibacterial body, and taking out the molded antibacterial chopping board after cooling.

Through above-mentioned technical scheme, utilize the cooling suppression setting to cool off in the preparation process, can accelerate the cooling process of chopping board, can prevent to a certain extent moreover that the chopping board from taking place the phenomenon of curling up in the cooling process, then the chopping board structure of production department is regular.

The invention is further configured to: when the degradable plastic is selected to degrade the rice hull fiber synthetic resin, in the step A, the components in the plastic injection molding machine are dried for 2 hours at the temperature of 70-95 ℃, and then the temperature is raised to 200-210 ℃ to be dissolved.

Through the technical scheme, the degradable plastic is easy to absorb when the degradable plastic is selected to degrade the rice hull fiber synthetic resin, and the phenomena of pits and the like on a chopping board processed by water evaporation when the temperature is higher in the processing process can be reduced by firstly drying the degradable plastic.

The invention is further configured to: and a plurality of densely distributed bulges are formed on the antibacterial body formed by injection molding of the chopping board die in the step A.

Through above-mentioned technical scheme, bellied setting can be when the cutter cuts the cutter cutting on bellied surface, then can reduce the phenomenon that a large amount of bacterial growing that the mar that produces caused on planar antibiotic body.

In summary, compared with the prior art, the beneficial effects of the invention are as follows:

1. the arranged antibacterial chopping board has an antibacterial effect and a degradable function, bacteria are not easy to breed when the chopping board is used, and meanwhile, the waste chopping board is degraded quickly and causes little pollution to the environment;

2. the chopping board has excellent waterproof performance, and can effectively avoid the phenomenon of easy decay in a wet state.

Drawings

FIG. 1 is a first perspective view of the embodiment, which is intended to show the position relationship between the upper surface of the antibacterial body and the anti-slip body;

FIG. 2 is a structural view of a second embodiment of the embodiment, and is intended to show the positional relationship between the lower surface of the antibacterial body and the antiskid body.

Reference numerals: 1. an antimicrobial body; 2. an anti-slip body; 3. and (4) protruding.

Detailed Description

The present invention will be described in further detail with reference to examples.

Example 1

An antibacterial chopping board comprises a degradable antibacterial body 1 and an antiskid body 2 coated on the edge of the antibacterial body 1, wherein a plurality of densely distributed bulges 3 are arranged on the antibacterial body 1;

the antibacterial body 1 comprises the following components, by weight, 3 parts of bamboo charcoal, 5 parts of starch, 70 parts of degradable PP resin and 2 parts of nano zinc oxide;

the antiskid body 2 comprises the following components, by weight, 70 parts of PP, 2 parts of nano zinc oxide and 5 parts of starch.

Example 2

Example 2 is different from example 1 in the parts by weight of the components of the antibacterial body 1 and the antiskid body 2; the antibacterial body 1 comprises the following components, by weight, 4 parts of bamboo charcoal, 6 parts of starch, 72 parts of degraded rice hull fiber synthetic resin and 3 parts of nano zinc oxide;

the antiskid body 2 comprises the following components, by weight, 72 parts of PP, 3 parts of nano zinc oxide and 6 parts of starch.

Example 3

Example 3 differs from example 1 in the parts by weight of the components of the antibacterial body 1 and the antiskid body 2; the antibacterial body 1 comprises the following components, by weight, 5 parts of bamboo charcoal, 7 parts of starch, 74 parts of degradable PP resin and 4 parts of nano zinc oxide;

the antiskid body 2 comprises the following components, by weight, 74 parts of PP, 4 parts of nano zinc oxide and 7 parts of starch.

Example 4

Example 4 differs from example 1 in the parts by weight of the components of the antibacterial body 1 and the antiskid body 2; the antibacterial body 1 comprises the following components, by weight, 5 parts of bamboo charcoal, 8 parts of starch, 76 parts of degraded rice hull fiber synthetic resin and 5 parts of nano zinc oxide;

the antiskid body 2 comprises the following components, by weight, 76 parts of PP, 5 parts of nano zinc oxide and 8 parts of starch.

Example 5

Example 5 differs from example 1 in the parts by weight of the components of the antibacterial body 1 and the antiskid body 2; the antibacterial body 1 comprises the following components, by weight, 4 parts of bamboo charcoal, 9 parts of starch, 78 parts of degradable PP resin and 6 parts of nano zinc oxide;

the antiskid body 2 comprises the following components, by weight, 30 parts of PP, 48 parts of PE, 6 parts of nano zinc oxide and 9 parts of starch.

Example 6

Example 6 differs from example 1 in the parts by weight of the components of the antibacterial body 1 and the antiskid body 2; the antibacterial body 1 comprises the following components, by weight, 3 parts of bamboo charcoal, 10 parts of starch, 80 parts of degraded rice hull fiber synthetic resin and 6 parts of nano zinc oxide;

the antiskid body 2 comprises the following components, by weight, 40 parts of PP, 40 parts of PE, 6 parts of nano zinc oxide and 10 parts of starch.

Example 7

A preparation process of an antibacterial chopping board comprises the following preparation steps:

step A: weighing the components of the antibacterial body 1 in the embodiments 1-7 according to the parts by weight, sequentially adding the components into a plastic injection molding machine, heating the temperature of the injection molding machine to 200-210 ℃, fully dissolving the components, injecting the components into a chopping board die through the injection molding machine, injection molding to form the antibacterial body 1, and taking out the antibacterial body 1 after the die is cooled;

and B: b, placing the antibacterial body 1 in the step A on a chopping board cooling and pressing device for cooling;

and C: and C, placing the antibacterial body 1 cooled in the step B on an injection molding machine, weighing the components of the antiskid body 2 in the embodiments 1-7, adding the components into a hopper of the injection molding machine, heating at the temperature of 200-210 ℃, extruding to form the antiskid body 2 coated on the antibacterial body 1, cooling, and taking out to obtain the antibacterial chopping board.

Experimental detection

1. Appearance: no crack, oil stain and impurity, and the waste edge is trimmed smoothly;

2. the dropping performance is as follows: placing the sample in a freezing chamber at-15 ℃ for 3h, taking out, placing at a height of 1.5m, freely falling parallel to the flat cement ground, and checking whether the crack and the crack occur;

3. and (3) antibacterial property: quantitatively inoculating bacteria on a chopping board to be detected, uniformly contacting the bacteria with a sample by a film pasting method, culturing for a certain time, measuring the number of viable bacteria on the chopping board, and calculating the bacteriostasis rate of the chopping board;

4. degradation performance: the chopping board prepared from the components of examples 1-6 is exposed to natural sun or artificial acceleration solarization by a xenon lamp, and the elongation at break is less than or equal to 5 percent and the weight average relative molecular weight reduction rate is more than or equal to 80 percent.

TABLE 1 test results of examples 1 to 6

It can be seen from the data in table 1 that the chopping boards made from the components of examples 1-6 all meet the requirements and have excellent strength, antibacterial properties and degradation properties, wherein example 6 was selected as the reference example.

Comparative example 1

Comparative example 1 is different from example 6 in that the antibacterial body does not contain bamboo charcoal in its components, and the others are the same as example 5.

Comparative example 2

The difference between the comparative example 2 and the example 6 is that 10-35 parts of water is added in the step b of preparing the synthetic resin for degrading the rice hull fiber, no PP is added, and the rest is consistent with the example 6.

Comparative example 3

The difference between the comparative example 3 and the example 7 is that when the degradable plastic is selected to degrade the rice hull fiber synthetic resin, the temperature of each component in the direct plastic injection molding machine in the step A is increased to 200-210 ℃ for dissolution, and the rest is consistent with the example 7.

Experimental detection, the detection is carried out according to the experimental detection method in the embodiment 1-7

TABLE 2 Experimental test results for comparative examples 1-3

Detecting items	Comparative example 1	Comparative example 2	Comparative example 3	Example 6
					Appearance of the product	Qualified	With micro-pores	With micro-pores	Qualified
Drop performance	Qualified	Qualified	Qualified	Qualified
					Inhibition rate/%)	97	Visible mould	Visible mould	99.2
Elongation at break/%	4.7	6.1	5.2	4
					Weight-average relative molecular weight reduction ratio%	82	89	85	88

Comparing the experimental results of comparative example 1 and example 6, it can be seen that there is a change in bacteriostatic properties, so that the applicant can reasonably deduce that the added bamboo charcoal can be cross-linked with the first antibacterial agent. The adhesion fastness of the first antibacterial agent can be enhanced, the antibacterial effect can be relatively durable, and when the components in the comparative example 1 do not contain bamboo charcoal, the degradation performance of the material is reduced, so that the applicant can reasonably deduce that the added bamboo charcoal and the degradable plastic have a synergistic effect directly, and the degradation performance of the material is enhanced; comparing the components in the comparative example 2 and the example 6, wherein in the preparation method of the synthetic resin for degrading rice hull fibers, the PP is replaced by water, the bacteriostasis rate of the material is obviously reduced, which indicates that the pores generated by the added water for degrading the rice hull fibers are larger, when the material is placed for standby, the pores can absorb water, when the chopping board is processed and formed, the water is evaporated at high temperature, micropores can appear on the chopping board, the water can be accumulated in the micropores, the breeding of bacteria can be easily caused under the condition of long-time storage, and the structural strength of the chopping board can be influenced by the corrosion of the chopping board; finally, comparing the comparative example 3 with the example 7, in the process of processing the chopping board, the chopping board which is also produced without a drying process has more pores and is easy to breed bacterial microorganisms.

The above description is intended to be illustrative of the present invention and not to limit the scope of the invention, which is defined by the claims appended hereto.

Claims

1. The utility model provides an antibiotic chopping board, is including degradable antibiotic body (1) and cladding antiskid body (2) at antibiotic body (1) edge, characterized by: the antibacterial body (1) comprises the following components, by weight, 3-5 parts of bamboo charcoal, 5-10 parts of starch, 70-80 parts of degradable plastic and 2-6 parts of a first antibacterial agent; the degradable plastic is selected from degradable PP resin or degradable rice hull fiber synthetic resin; the anti-skid body (2) comprises 70-80 parts by weight of PP or PE, 2-6 parts by weight of a second antibacterial agent and 5-10 parts by weight of starch; the first antibacterial agent and the second antibacterial agent are both selected from acidic nano zinc oxide;

the degraded PP resin comprises the following preparation processes,

step 1, directly adding inorganic filler calcium carbonate, talcum powder and low-molecular polyethylene wax into PP resin, mixing by a high-speed mixer, plasticating and granulating by a double-screw extruder to obtain polypropylene resin master batches, and controlling the temperature of the extruder at 200-220 ℃;

step 2, directly adding starch and low-molecular polyethylene wax into PP resin, mixing by a high-speed mixer, plasticating and granulating by a double-screw extruder to obtain degraded master batch;

step 3, uniformly mixing the PP resin master batch and the degradation master batch according to the weight part ratio of 10: 1;

the synthetic resin for degrading the rice hull fiber comprises the following preparation processes,

c. putting 15-35 parts by weight of natural resin and 65-85 parts by weight of lignin into a reaction kettle, adding 10-20 parts by weight of PP into the kettle, uniformly stirring to form slurry, heating to 100-300 ℃, adding 5-15 parts by weight of nano silicon dioxide, continuously stirring uniformly, cooling the kettle to below 120 ℃, adding 7-30 parts by weight of rice hull fiber powder, continuously stirring, uniformly stirring, cooling, and taking out to prepare a pasty material;

e. d, cooling the rice hull fiber synthetic resin powder in the step d, and then packaging and storing;

the preparation process of the antibacterial chopping board comprises the following preparation steps:

step A: weighing 3-5 parts of bamboo charcoal, 5-10 parts of starch, 70-80 parts of degradable plastic and 2-6 parts of a first antibacterial agent according to parts by weight, sequentially adding into a plastic injection molding machine, heating the temperature of the injection molding machine to 200-210 ℃, fully melting all the components, injecting into a chopping board die through the injection molding machine, injection molding to form an antibacterial body (1), and taking out the antibacterial body (1) after the die is cooled;

and B: b, placing the antibacterial body (1) in the step A on a chopping board cooling and pressing device for cooling;

and C: placing the antibacterial body (1) cooled in the step B on an injection molding machine, adding 70-80 parts by weight of PP or PE, 2-6 parts by weight of a second antibacterial agent and 5-10 parts by weight of starch into a hopper of the injection molding machine, heating at the temperature of 200-210 ℃, extruding to form an anti-slip body (2) coated on the antibacterial body (1), and taking out the formed antibacterial chopping board after cooling;

a plurality of densely distributed bulges (3) are formed on the antibacterial body (1) formed by injection molding of the chopping board die in the step A.

2. The antibacterial chopping board as claimed in claim 1, wherein: the temperature of the mixer in the step 2 is 30-35 ℃.

3. The antibacterial chopping board as claimed in claim 1, wherein: and c, selecting at least one of edible gelatin and hydrogenated rosin as the natural resin in the step c.

4. The antibacterial chopping board as claimed in claim 1, wherein: when the degradable plastic is selected to degrade the rice hull fiber synthetic resin, in the step A, all components in the plastic injection molding machine are dried for 2 hours at 70-95 ℃, and then the temperature is raised to 200-210 ℃ for melting.