Food packaging box based on polyethylene plastic and production method thereof

Abstract

The invention discloses a food packaging box based on polyethylene plastic and a production method of the food packaging box. The food packaging box is prepared from the following raw materials in parts by weight: 100 parts of polyethylene resin, 10-15 parts of polyethylene glycol, 8-13 parts of polyglycolic acid, 5-10 parts of filler, 2-4 parts of macromolecular antistatic polymer, 1-3 parts of stabilizer, 1-2 parts of lubricant and 0.5-1 part of processing aid. The macromolecular antistatic polymer contains ions, the conductive mechanism of the macromolecular antistatic polymer belongs to a charge transfer type, and a physical electric field generated by cationic groups adsorbs negative charges, so that electrostatic charges can be quickly leaked, and static electricity disappears. On the other hand, quaternary ammonium salt positive ions can adsorb moisture in air, so that a conductive channel is formed, and charges can be quickly moved away from the surface of the material; different from a micromolecular antistatic agent, the macromolecular antistatic polymer has good compatibility with the polyethylene resin, is not easy to separate out or dissolve out, and can maintain the antistatic and antifouling properties for a long time, so that the prepared food packaging box can be stored and used for a long time.

Description

Technical Field

[0001] The invention belongs to the technical field of plastics, and in particular relates to a food packaging box based on polyethylene plastic and a production method thereof. Background Art

[0002] Polyethylene resin is an engineering plastic with good comprehensive properties. It has excellent thermal stability, cold resistance, good fluidity and chemical medium stability, as well as good processing performance and dimensional stability.

[0003] Polyethylene resin has been widely used in industries such as food, home appliances, construction, automobiles, and office supplies. Among them, food packaging accounts for a large proportion, such as beverage packaging, quick-frozen food packaging, steamed food packaging, and fast food packaging. These products have brought great convenience to people's lives. However, the antistatic property of polyethylene is poor, and the food packaging box made in this way is prone to static electricity adsorption of small particles such as dust and oil smoke, and has poor antifouling performance. In the prior art, antistatic agents are often added to polyethylene substrates to solve their static problems, but some antistatic agents are not compatible with polyethylene substrates, resulting in problems such as cracking and whitening of the prepared food packaging boxes. As time goes by, the antistatic agent also has the phenomenon of precipitation or dissolution, and then the safety performance of the food packaging box is reduced. Therefore, it is very important that the antistatic property of polyethylene plastics is solved by this application, so that the prepared food packaging boxes can be stored and used for a long time. Summary of the invention

[0004] The object of the present invention is to provide a food packaging box based on polyethylene plastic and a production method thereof.

[0005] The purpose of the present invention can be achieved through the following technical solutions:

[0006] A food packaging box based on polyethylene plastic includes the following raw materials in parts by weight:

[0007] 100 parts of polyethylene resin, 10-15 parts of polyethylene glycol, 8-13 parts of polyglycolic acid, 5-10 parts of filler, 2-4 parts of macromolecular antistatic polymer, 1-3 parts of stabilizer, 1-2 parts of lubricant, 0.5-1 parts of processing aid;

[0008] The macromolecular antistatic polymer is a polymer containing quaternary ammonium salt.

[0009] Furthermore, the filler is egg shell powder.

[0010] Furthermore, the preparation method of the macromolecular antistatic polymer is specifically as follows:

[0011] Step 1, add 1.7-1.8g N,N,N',N'-tetramethyl-1,6-hexanediamine, 0.1-0.4g sodium tert-butoxide and 100-150ml DMF solvent to a reaction bottle equipped with a heating device, a filtering device and a nitrogen protection device, introduce nitrogen while stirring to replace the air in the reaction kettle, heat to 70-80°C, then add 2.0-3.0g allyl chloride dropwise, after the addition is completed, heat to 90-95°C while stirring, and keep the temperature for 6-10h. After the reaction is completed, add 10-15ml water to the reaction bottle to quench the reaction, cool naturally, and recrystallize after reduced pressure distillation to obtain a diquaternary ammonium salt intermediate;

[0012] Step 2: Add 0.3-0.5g of the diquaternary ammonium salt intermediate prepared in step 1, 2.5-3.0g of ethyl but-2-enoate, 100-150ml of solvent toluene and 0.05-0.1g of initiator into a reactor, set the reactor pressure to 3.5-5.0MPa, and the temperature to 75-80°C for 20-30min for prepolymerization, then raise the temperature to 160-170°C for polymerization for 2-3h. After the reaction is completed, remove the solvent by vacuum distillation to obtain a colorless or light yellow viscous transparent liquid, which is a macromolecular antistatic polymer.

[0013] Furthermore, the recrystallization is carried out using a mixed solution of acetone:ethanol=4:1.

[0014] Furthermore, the initiator is ammonium persulfate or potassium persulfate.

[0015] Furthermore, the PVC processing aid is an acrylic polymer.

[0016] Furthermore, the lubricant is one or more combinations of paraffin, polyethylene wax or stearic acid.

[0017] Furthermore, the stabilizer is a calcium zinc stabilizer.

[0018] A method for producing a food packaging box based on polyethylene plastic comprises the following steps:

[0019] The first step is to put each component of the formula into a mixer for mixing and stirring at a temperature of 60-80°C;

[0020] The second step is to put the mixed material in the first step into a twin-screw extruder granulator for kneading and then melt-extrude to form masterbatch;

[0021] The third step is to add the masterbatch prepared in the second step into the molding machine, extrude and shape it, and cool it naturally to obtain a food packaging box.

[0022] Beneficial effects of the present invention:

[0023] The invention provides a food packaging box based on polyethylene plastic, wherein the macromolecular antistatic polymer prepared therein is first subjected to a substitution reaction under alkaline conditions with allyl chloride and N,N,N',N'-tetramethyl-1,6-hexanediamine as raw materials to obtain a diquaternary ammonium salt intermediate, and then the diquaternary ammonium salt intermediate and but-2-enoic acid ethyl ester are subjected to a polymerization reaction under the action of an initiator to obtain a macromolecular antistatic polymer, wherein the macromolecular antistatic polymer contains ions, and its conductive mechanism belongs to the charge transfer type, and the physical electric field generated by the cationic group adsorbs negative charges, which can make static charges leak quickly and make static electricity disappear. On the other hand, the quaternary ammonium salt positive ions can adsorb moisture in the air, thereby forming a conductive channel, so that the charge can be quickly removed from the surface of the material; unlike small molecule antistatic agents, the macromolecular antistatic polymer has good compatibility with polyethylene resin, is not easy to precipitate or dissolve, and can maintain antistatic and antifouling properties for a long time, so that the prepared food packaging box can be stored and used for a long time.

[0024] Of course, any product implementing the present invention does not necessarily need to achieve all of the advantages described above at the same time. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for describing the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative work.

[0026] Figure 1 is the nuclear magnetic hydrogen spectrum of the diquaternary ammonium salt intermediate of the present invention;

[0027] Figure 2 This is an infrared image of the macromolecular antistatic polymer of the present invention. DETAILED DESCRIPTION

[0028] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0029] In the following embodiments, the preparation method of the macromolecular antistatic polymer is specifically as follows:

[0030] Step 1, add 1.7g N,N,N',N'-tetramethyl-1,6-hexanediamine, 0.2g sodium tert-butoxide and 120ml solvent DMF to a reaction bottle equipped with a heating device, a filtering device and a nitrogen protection device, introduce nitrogen while stirring to replace the air in the reaction kettle, heat to 70°C, then add 2.6g allyl chloride dropwise, after the addition is completed, heat to 90°C while stirring, and keep the temperature for 10h. After the reaction is completed, add 10ml of water to the reaction bottle to quench the reaction, cool naturally, and recrystallize after reduced pressure distillation to obtain a diquaternary ammonium salt intermediate;

[0031] The NMR hydrogen spectrum results of the obtained diquaternary ammonium salt intermediate are:

[0032] 1 HNMR (400MHz, CDCl3): δ1.87(m,4H),2.68(m,4H),3.61(t,4H),3.79(s,12H),4.26(d,4H),5.03(d,4H),5.72(m,2H)(such as Figure 1 shown);

[0033] The recrystallization is carried out by using a mixed solution of acetone:ethanol=4:1;

[0034] Step 2: Add 0.3g of the diquaternary ammonium salt intermediate prepared in step 1, 3.0g of ethyl but-2-enoate, 100ml of toluene solvent and 0.05g of initiator ammonium persulfate into a reactor, set the reactor pressure to 4.0MPa, and keep the temperature at 75°C for 20min for prepolymerization, then heat to 170°C for polymerization for 2h. After the reaction is completed, remove the solvent by distillation under reduced pressure to obtain a colorless or light yellow viscous transparent liquid, which is a macromolecular antistatic polymer;

[0035] The infrared characterization of macromolecular antistatic polymers is as follows: IR (KBr): (benzene ring), 2978 (-CH3, -CH2-), 1765 (-COO-), 1391 (CN + )cm -1 ;(like Figure 2 (shown)

[0036] The initiator is ammonium persulfate or potassium persulfate;

[0037] Allyl chloride, cas:107-05-1;

[0038] N,N,N',N'-tetramethyl-1,6-hexanediamine, cas:111-18-2;

[0039] But-2-enoic acid ethyl ester, cas:10544-63-5.

[0040] Example 1

[0041] A food packaging box based on polyethylene plastic includes the following raw materials in parts by weight:

[0042] 100 parts of polyethylene resin, 10 parts of polyethylene glycol, 10 parts of polyglycolic acid, 5 parts of filler, 2 parts of macromolecular antistatic polymer, 1 part of stabilizer, 2 parts of lubricant, 0.5 parts of processing aid;

[0043] The filler is egg shell powder;

[0044] The PVC processing aid is an acrylic polymer;

[0045] The lubricant is paraffin;

[0046] The stabilizer is a calcium zinc stabilizer;

[0047] A method for producing a food packaging box based on polyethylene plastic comprises the following steps:

[0048] The first step is to put each component of the formula into a mixer for mixing and stirring at a stirring temperature of 70°C;

[0049] The second step is to put the mixed material in the first step into a twin-screw extruder granulator for kneading and then melt-extrude to form masterbatch;

[0050] The third step is to add the masterbatch prepared in the second step into the molding machine, extrude and shape it, and cool it naturally to obtain a food packaging box.

[0051] Example 2

[0052] A food packaging box based on polyethylene plastic includes the following raw materials in parts by weight:

[0053] 100 parts of polyethylene resin, 12 parts of polyethylene glycol, 11 parts of polyglycolic acid, 7 parts of filler, 3 parts of macromolecular antistatic polymer, 2 parts of stabilizer, 1 part of lubricant, and 0.8 parts of processing aid;

[0054] The filler is egg shell powder;

[0055] The PVC processing aid is an acrylic polymer;

[0056] The lubricant is polyethylene wax;

[0057] The stabilizer is a calcium zinc stabilizer;

[0058] A method for producing a food packaging box based on polyethylene plastic comprises the following steps:

[0059] The first step is to put each component of the formula into a mixer for mixing and stirring at a stirring temperature of 65°C;

[0060] The second step is to put the mixed material in the first step into a twin-screw extruder granulator for kneading and then melt-extrude to form masterbatch;

[0061] The third step is to add the masterbatch prepared in the second step into the molding machine, extrude and shape it, and cool it naturally to obtain a food packaging box.

[0062] Example 3

[0063] A food packaging box based on polyethylene plastic includes the following raw materials in parts by weight:

[0064] 100 parts of polyethylene resin, 15 parts of polyethylene glycol, 10 parts of polyglycolic acid, 6 parts of filler, 3.5 parts of macromolecular antistatic polymer, 3 parts of stabilizer, 1.5 parts of lubricant, and 0.5 parts of processing aid;

[0065] The filler is egg shell powder;

[0066] The PVC processing aid is an acrylic polymer;

[0067] The lubricant is a mixture of paraffin wax and stearic acid in a mass ratio of 2:1;

[0068] The stabilizer is a calcium zinc stabilizer.

[0069] A method for producing a food packaging box based on polyethylene plastic comprises the following steps:

[0070] The first step is to put each component of the formula into a mixer for mixing and stirring at a temperature of 80°C;

[0071] The second step is to put the mixed material in the first step into a twin-screw extruder granulator for kneading and then melt-extrude to form masterbatch;

[0072] The third step is to add the masterbatch prepared in the second step into the molding machine, extrude and shape it, and cool it naturally to obtain a food packaging box.

[0073] Example 4

[0074] A food packaging box based on polyethylene plastic includes the following raw materials in parts by weight:

[0075] 100 parts of polyethylene resin, 12 parts of polyethylene glycol, 13 parts of polyglycolic acid, 10 parts of filler, 4 parts of macromolecular antistatic polymer, 1 part of stabilizer, 1 part of lubricant, 1 part of processing aid;

[0076] The filler is egg shell powder;

[0077] The PVC processing aid is an acrylic polymer;

[0078] The lubricant is stearic acid;

[0079] The stabilizer is a calcium zinc stabilizer;

[0080] A method for producing a food packaging box based on polyethylene plastic comprises the following steps:

[0081] The first step is to put each component of the formula into a mixer for mixing and stirring at a stirring temperature of 75°C;

[0082] The second step is to put the mixed material in the first step into a twin-screw extruder granulator for kneading and then melt-extrude to form masterbatch;

[0083] The third step is to add the masterbatch prepared in the second step into the molding machine, extrude and shape it, and cool it naturally to obtain a food packaging box.

[0084] Comparative Example 1

[0085] A food packaging box based on polyethylene plastic includes the following raw materials in parts by weight:

[0086] 100 parts of polyethylene resin, 12 parts of polyethylene glycol, 13 parts of polyglycolic acid, 10 parts of filler, 1 part of stabilizer, 1 part of lubricant, 1 part of processing aid;

[0087] The filler is egg shell powder;

[0088] The PVC processing aid is an acrylic polymer;

[0089] The lubricant is stearic acid;

[0090] The stabilizer is a calcium zinc stabilizer;

[0091] A method for producing a food packaging box based on polyethylene plastic comprises the following steps:

[0092] The first step is to put each component of the formula into a mixer for mixing and stirring at a stirring temperature of 75°C;

[0093] The second step is to put the mixed material in the first step into a twin-screw extruder granulator for kneading and then melt-extrude to form masterbatch;

[0094] The third step is to add the masterbatch prepared in the second step into the molding machine, extrude and shape it, and cool it naturally to obtain a food packaging box.

[0095] Comparative Example 2

[0096] A food packaging box based on polyethylene plastic includes the following raw materials in parts by weight:

[0097] 100 parts of polyethylene resin, 12 parts of polyethylene glycol, 13 parts of polyglycolic acid, 10 parts of filler, 2 parts of diquaternary ammonium salt intermediate, 1 part of stabilizer, 1 part of lubricant, 1 part of processing aid;

[0098] The filler is egg shell powder;

[0099] The PVC processing aid is an acrylic polymer;

[0100] The lubricant is stearic acid;

[0101] The stabilizer is a calcium zinc stabilizer;

[0102] A method for producing a food packaging box based on polyethylene plastic comprises the following steps:

[0103] The first step is to put each component of the formula into a mixer for mixing and stirring at a stirring temperature of 75°C;

[0104] The second step is to put the mixed material in the first step into a twin-screw extruder granulator for kneading and then melt-extrude to form masterbatch;

[0105] The third step is to add the masterbatch prepared in the second step into the molding machine, extrude and shape it, and cool it naturally to obtain a food packaging box.

[0106] The food packaging boxes prepared in the above embodiments and comparative examples were tested for performance

[0107] Test method: The surface resistivity of the sample was measured using a surface resistivity tester; after the measurement, each sample was soaked in water and ethanol for 1 month, dried naturally, rinsed with water again, dried naturally, and the surface resistivity of each sample was measured. The results are shown in Table 1;

[0108] Table 1. Surface resistivity of food packaging boxes

[0109]

[0110] In general, the surface resistivity is less than 10 10 Ω has obvious antistatic effect, the smaller the surface resistivity, the better the antistatic effect.

[0111] It can be seen from Table 1 that the food packaging box prepared in the embodiment has good antistatic properties, and has water resistance and solvent resistance, is not affected by humidity, and can maintain the antistatic properties of the food packaging box for a long time.

[0112] The above contents are merely examples and explanations of the concept of the present invention. The technicians in this technical field may make various modifications or additions to the specific embodiments described or replace them in a similar manner. As long as they do not deviate from the concept of the invention or exceed the scope defined by the claims, they should all fall within the protection scope of the present invention.

Claims

1. A food packaging box based on polyethylene plastic, characterized in that: The invention comprises the following raw materials in parts by weight: 100 parts of polyethylene resin, 10-15 parts of polyethylene glycol, 8-13 parts of polyglycolic acid, 5-10 parts of filler, 2-4 parts of macromolecular antistatic polymer, 1-3 parts of stabilizer, 1-2 parts of lubricant, 0.5-1 parts of processing aid; The macromolecular antistatic polymer is a polymer containing quaternary ammonium salt.

2. A polyethylene plastic food packaging box according to claim 1, characterized in that: The filler is egg shell powder.

3. A polyethylene plastic food packaging box according to claim 1, characterized in that: The preparation method of the macromolecular antistatic polymer is specifically as follows: Step 1, add 1.7-1.8g N,N,N',N'-tetramethyl-1,6-hexanediamine, 0.1-0.4g sodium tert-butoxide and 100-150ml DMF solvent to a reaction bottle equipped with a heating device, a filtering device and a nitrogen protection device, introduce nitrogen while stirring to replace the air in the reaction kettle, heat to 70-80°C, then add 2.0-3.0g allyl chloride dropwise, after the addition is completed, heat to 90-95°C while stirring, and keep the temperature for 6-10h. After the reaction is completed, add 10-15ml water to the reaction bottle to quench the reaction, cool naturally, and recrystallize after reduced pressure distillation to obtain a diquaternary ammonium salt intermediate; Step 2: Add 0.3-0.5g of the diquaternary ammonium salt intermediate prepared in step 1, 2.5-3.0g of ethyl but-2-enoate, 100-150ml of solvent toluene and 0.05-0.1g of initiator into a reactor, set the reactor pressure to 3.5-5.0MPa, and the temperature to 75-80°C for 20-30min for prepolymerization, then raise the temperature to 160-170°C for polymerization for 2-3h. After the reaction is completed, remove the solvent by vacuum distillation to obtain a colorless or light yellow viscous transparent liquid, which is a macromolecular antistatic polymer.

4. A polyethylene plastic-based food packaging box according to claim 3, characterized in that: The recrystallization is carried out using a mixed solution of acetone:ethanol=4:

1.

5. A polyethylene plastic-based food packaging box according to claim 3, characterized in that: The initiator is ammonium persulfate or potassium persulfate.

6. A polyethylene plastic food packaging box according to claim 1, characterized in that: The PVC processing aid is an acrylic polymer.

7. A polyethylene plastic food packaging box according to claim 1, characterized in that: The lubricant is one or more combinations of paraffin, polyethylene wax or stearic acid.

8. A polyethylene plastic-based food packaging box according to claim 1, characterized in that: The stabilizer is a calcium zinc stabilizer.

9. A method for producing a polyethylene plastic food packaging box as claimed in claim 1, characterized in that: The following steps are involved: The first step is to put each component of the formula into a mixer for mixing and stirring at a temperature of 60-80°C; The second step is to put the mixed material in the first step into a twin-screw extruder granulator for kneading and then melt-extrude to form masterbatch; The third step is to add the masterbatch prepared in the second step into the molding machine, extrude and shape it, and cool it naturally to obtain a food packaging box.

Images