Wax for packaging material

Abstract

The invention discloses wax for a packaging material. The wax comprises the following raw materials in parts by weight: 40-70 parts of food-grade fully-refined paraffin wax; 15 to 40 parts of microcrystalline wax; 1 to 20 parts of an auxiliary agent; 0 to 10 parts of polyester wax; 0 to 10 parts of polyethylene; and 20-45 parts of petroleum resin. By optimizing the wax waterproof technology of the waterproof coating of the carton, firstly, the wax can be in direct contact with food, secondly, the wax is an environment-friendly product and cannot pollute the environment, and finally, the waxing process is simple, high in production efficiency and low in cost.

Description

Technical Field

[0001] The invention belongs to the technical field of waterproofing, and in particular relates to wax for packaging materials. Background Art

[0002] Many foods are stored and transported after being frozen, especially seafood caught in the ocean, imported vegetables and meat, etc., which need to be stored and transported in a low-temperature environment. Now the main packaging containers are foam boxes, plastic boxes and cartons, but as people's environmental awareness increases, it is foreseeable that the use of foam boxes and plastic boxes will be greatly reduced in the future, and carton packaging will become the mainstream packaging method.

[0003] In order to make cartons waterproof and moisture-proof, in addition to preliminary treatment of the cardboard, it is more important to apply a waterproof coating. Currently, there are two main forms of waterproof coating: polymer film coating and varnish coating. Among them, varnish can only be applied to the outer surface of the carton and cannot be in direct contact with food. Polymer film requires adhesive when bonding with the carton, and polymer film itself is subject to the plastic ban. Therefore, there is a large market application gap in carton waterproof coating.

[0004] Therefore, in view of the above-mentioned technical problems, it is necessary to provide a kind of wax, paper and packaging material for packaging material.

[0005] The information disclosed in this background technology section is only intended to enhance the understanding of the overall background of the invention and should not be regarded as an acknowledgment or any form of suggestion that the information constitutes the prior art already known to a person skilled in the art. Summary of the invention

[0006] The object of the present invention is to provide a wax, paper and packaging material for packaging materials.

[0007] In order to achieve the above object, a technical solution provided by a specific embodiment of the present invention is as follows:

[0008] Wax for packaging materials, the raw materials of which include, by weight:

[0009] Food grade fully refined paraffin: 40-70 parts;

[0010] Microcrystalline wax: 15-40 parts;

[0011] Additives: 1-20 parts;

[0012] Polyester wax: 0-10 parts;

[0013] Polyethylene: 0-10 parts;

[0014] Petroleum resin: 20-45 parts.

[0015] In one or more embodiments of the present invention, the food-grade fully refined paraffin is selected from: 56# fully refined paraffin, 58# fully refined paraffin, 62# fully refined paraffin, and 64# fully refined paraffin.

[0016] In one or more embodiments of the present invention, the microcrystalline wax is selected from: 75# microcrystalline wax and 80# microcrystalline wax.

[0017] In one or more embodiments of the present invention, the auxiliary agent is selected from: amorphous alpha olefin (APAO), ethylene-vinyl acetate copolymer (EVA), random copolymer polypropylene (APP), styrene-butylene-styrene block copolymer (SEBS), and polybutene (PB).

[0018] In one or more embodiments of the present invention, the petroleum resin is selected from: C5 petroleum resin, C5 hydrogenated petroleum resin, rosin glycerol ester, terpene resin.

[0019] In one or more embodiments of the present invention, the polyethylene is selected from LLDPE and LDPE.

[0020] In one or more embodiments of the present invention, the polyethylene is a mixture of LLDPE and LDPE, and the LLDPE accounts for 65-75% by weight.

[0021] In one or more embodiments of the present invention, the polyester wax is obtained by bulk polymerization using the following raw materials, in parts by weight:

[0022]

[0023] Preferably, the polyester wax can be obtained by the following method:

[0024] Polymerization formula:

[0025]

[0026] Polymerization method: Bulk polymerization

[0027] Polymerization process: 550g of tert-butyl vinyl carbonate and 12g of chain transfer agent were placed in a four-necked flask. One of the four ports of the flask was connected to a stirrer; one was connected to a thermometer; one was used for adding materials and was plugged with a bottle stopper when no materials were added; and the last one was connected to a condenser. N was passed for 0.5h. 2 , in N 2 Heat the mixture in a water bath to 66-68°C under an atmosphere of , keep warm for 0.5h, start stirring at 80rpm, and start circulating water in the condenser.

[0028] Weigh 2.52g of initiator AIBN, disperse it in 50g of tert-butyl vinyl carbonate, and add it into the flask with a dropper. When the temperature starts to rise significantly, it means that the reaction has begun. At this time, start timing and use cold water to cool the flask to control the reaction temperature at 66-68℃.

[0029] After the reaction was carried out for 1.5 hours, the viscosity of the system increased during this process, and the rotation speed was adjusted to 150 rpm. 570 g of tert-butyl ester was added dropwise into the flask using a dropper within 2 hours, and the reaction was continued for 2.5 hours. Finally, the remaining 1.08 g of AIBN was dispersed in 30 g of tert-butyl ester and added to the flask. The temperature was raised to 80°C and the reaction was continued for 2 hours.

[0030] After the reaction is completed, the temperature is lowered and the material is discharged. The polymer is vacuum dried at 80°C for 8 hours to obtain the white solid polyester wax of the present invention. Properties of polyester wax: weight average molecular weight of 5000-50000, drop melting point of 95-110°C, kinematic viscosity of 400-700mm at 120°C 2 / s.

[0031] In one or more embodiments of the present invention, a packaging paper includes a paper body and a coating layer obtained by packaging material wax formed on at least one side of the paper body.

[0032] In one or more embodiments of the present invention, the packaging article includes a box-shaped body with a hollow structure, and the box-shaped body is made of packaging paper.

[0033] Compared with the prior art, the wax, paper and packaging materials used in the present invention optimize the wax waterproof technology of the carton waterproof coating. Firstly, the wax can be in direct contact with food. Secondly, the wax is an environmentally friendly product and will not pollute the environment. Finally, the wax coating process is simple, the production efficiency is high and the cost is low. DETAILED DESCRIPTION

[0034] In order to enable those skilled in the art to better understand the technical solutions of the present invention, the technical solutions of the present invention will be clearly and completely described below in conjunction with 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 should fall within the scope of protection of the present invention.

[0035] It is well known that wax is easy to fall off from the substrate and crack in a freezing environment, which further limits the application of wax as a waterproof coating. The present invention is elaborated in detail from the application field and development ideas, and the advantages and innovations of the present invention are fully understood.

[0036] The wax coating of paperboard can be regarded as the bonding process between wax and paperboard. The wax coating can be used as one of the substrates, and the other substrate is paperboard. Paperboard is a porous material. When the wax melts, it can penetrate into the interior along the pores of the paperboard and wrap around the surface of the paperboard fiber to protect the paperboard fiber from water and moisture. This is a layer of protection; most of the wax solidifies on the surface of the paperboard after cooling to form a wax film of a certain thickness, which is a second layer of protection. The main bonding mechanisms involved include adsorption theory, weak boundary layer theory, and mechanical force theory. The adsorption theory is specifically manifested in that the embodiments of the present invention contain more or less ester groups, which are easy to form hydrogen bonds with polar groups such as hydroxyl groups in the fiber structure of the paperboard to improve the bonding force. The weak boundary layer theory is specifically that the wax layer on the surface of the paperboard and the fiber-attached wax inside the paperboard are overall manifested as a continuous phase, which helps to improve the adhesion; the mechanical action theory is manifested in that the wax-coated paperboard needs to be rolled with wax through a mesh roller during production. Compared with other wax coatings that mainly rely on mechanical forces and weak boundary layer mechanisms, the adsorption theory contained in the present invention can provide very important adhesion, ensuring that the wax layer is firmly bonded to the paperboard and is not easy to fall off.

[0037] Including but not limited to the following examples, the polyester wax is obtained by the following method:

[0038]

[0039] Polymerization method: Bulk polymerization

[0040] Polymerization process: 550g of tert-butyl vinyl carbonate and 12g of chain transfer agent were placed in a four-necked flask. One of the four ports of the flask was connected to a stirrer; one was connected to a thermometer; one was used for adding materials and was plugged with a bottle stopper when no materials were added; and the last one was connected to a condenser. N was passed for 0.5h. 2 , in N 2 Heat the mixture in a water bath to 66-68°C under an atmosphere of , keep warm for 0.5h, start stirring at 80rpm, and start circulating water in the condenser.

[0041] Weigh 2.52g of initiator AIBN, disperse it in 50g of tert-butyl vinyl carbonate, and add it into the flask with a dropper. When the temperature starts to rise significantly, it means that the reaction has begun. At this time, start timing and use cold water to cool the flask to control the reaction temperature at 66-68℃.

[0042] After the reaction was carried out for 1.5 hours, the viscosity of the system increased during this process, and the rotation speed was adjusted to 150 rpm. 570 g of tert-butyl ester was added dropwise into the flask using a dropper within 2 hours, and the reaction was continued for 2.5 hours. Finally, the remaining 1.08 g of AIBN was dispersed in 30 g of tert-butyl ester and added to the flask. The temperature was raised to 80°C and the reaction was continued for 2 hours.

[0043] After the reaction is completed, the temperature is lowered and the material is discharged. The polymer is vacuum dried at 80°C for 8 hours to obtain the white solid polyester wax of the present invention. Properties of polyester wax: weight average molecular weight of 5000-50000, drop melting point of 95-110°C, kinematic viscosity of 400-700mm at 120°C 2 / s.

[0044] LLDPE is 7042, a product of Jilin Petrochemical; LDPE is 2426H, a product of Daqing Petrochemical.

[0045] Embodiment 1:

[0046] The wax for packaging material of this embodiment comprises the following raw materials, in parts by weight:

[0047] 58# fully refined paraffin wax: 40 parts

[0048] 75# microcrystalline wax: 32 parts

[0049] APAO: 5 servings

[0050] Polyester wax: 1 part

[0051] LDPE: 2 parts

[0052] C5 petroleum resin: 20 parts.

[0053] Process:

[0054] 1. Melt the paraffin wax and polyester wax completely at 120℃, stir and keep warm for 0.5h;

[0055] 2. Add APAO and polyethylene, and stir at a constant temperature of 120℃;

[0056] 3. After step 2 is completely melted, add microcrystalline wax and petroleum resin and stir at a constant temperature of 110°C;

[0057] 4. After all the raw materials are completely melted, continue stirring at a constant temperature of 110℃ for 0.5h and then discharge the material.

[0058] Embodiment 2:

[0059] The wax for packaging material of this embodiment comprises the following raw materials, in parts by weight:

[0060] 58# fully refined paraffin wax: 40 parts

[0061] 75# microcrystalline wax: 32 parts

[0062] APAO: 5 servings

[0063] Polyester wax: 1 part

[0064] LLDPE: 2 parts

[0065] C5 petroleum resin: 20 parts.

[0066] Process:

[0067] 1. Melt the paraffin wax and polyester wax completely at 120℃, stir and keep warm for 0.5h;

[0068] 2. Add APAO and polyethylene, and stir at a constant temperature of 120℃;

[0069] 3. After step 2 is completely melted, add microcrystalline wax and petroleum resin, and stir at a constant temperature of 110°C; 4. After all raw materials are completely melted, continue to stir at a constant temperature of 110°C for 0.5h and discharge.

[0070] Embodiment 3:

[0071] The wax for packaging material of this embodiment comprises the following raw materials, in parts by weight:

[0072] 58# fully refined paraffin wax: 40 parts

[0073] 75# microcrystalline wax: 32 parts

[0074] APAO: 5 servings

[0075] Polyester wax: 1 part

[0076] LDPE: 1 part

[0077] LLDPE: 1 part

[0078] C5 petroleum resin: 20 parts.

[0079] Process:

[0080] 1. Melt the paraffin wax and polyester wax completely at 120℃, stir and keep warm for 0.5h;

[0081] 2. Add APAO and polyethylene, and stir at a constant temperature of 120℃;

[0082] 3. After step 2 is completely melted, add microcrystalline wax and petroleum resin, and stir at a constant temperature of 110°C; 4. After all raw materials are completely melted, continue to stir at a constant temperature of 110°C for 0.5h and discharge.

[0083] Embodiment 4:

[0084] The wax for packaging material of this embodiment comprises the following raw materials, in parts by weight:

[0085] 58# fully refined paraffin wax: 40 parts

[0086] 75# microcrystalline wax: 32 parts

[0087] APAO: 5 servings

[0088] LDPE: 2 parts

[0089] C5 petroleum resin: 20 parts.

[0090] Process:

[0091] 1. Melt the paraffin completely at 120℃, stir and keep warm for 0.5h;

[0092] 2. Add APAO and polyethylene, and stir at a constant temperature of 120℃;

[0093] 3. After step 2 is completely melted, add microcrystalline wax and petroleum resin, and stir at a constant temperature of 110°C; 4. After all raw materials are completely melted, continue to stir at a constant temperature of 110°C for 0.5h and discharge.

[0094] Embodiment 5:

[0095] The wax for packaging material of this embodiment comprises the following raw materials, in parts by weight:

[0096] 58# fully refined paraffin wax: 40 parts

[0097] 75# microcrystalline wax: 32 parts

[0098] APAO: 5 servings

[0099] Polyester wax: 1 part

[0100] C5 petroleum resin: 20 parts.

[0101] Process:

[0102] 1. Melt the paraffin wax and polyester wax completely at 120℃, stir and keep warm for 0.5h;

[0103] 2. Add APAO and stir at 120℃ constant temperature;

[0104] 3. After step 2 is completely melted, add microcrystalline wax and petroleum resin, and stir at a constant temperature of 110°C; 4. After all raw materials are completely melted, continue to stir at a constant temperature of 110°C for 0.5h and discharge.

[0105] Embodiment 6:

[0106] The wax for packaging material of this embodiment comprises the following raw materials, in parts by weight:

[0107] 58# fully refined paraffin wax: 40 parts

[0108] 75# microcrystalline wax: 25 parts

[0109] Polyester wax: 2 parts

[0110] Polyethylene is a mixture of LLDPE and LDPE, with LLDPE accounting for 65wt%: 2 parts APAO: 3 parts

[0111] C5 hydrogenated petroleum resin: 20 parts.

[0112] Process:

[0113] 1. Melt the paraffin wax and polyester wax completely at 120℃, stir and keep warm for 0.5h;

[0114] 2. Add polyethylene and APAO and stir at a constant temperature of 120℃;

[0115] 3. After step 2 is completely melted, add microcrystalline wax and petroleum resin, and stir at a constant temperature of 110°C; 4. After all raw materials are completely melted, continue to stir at a constant temperature of 110°C for 0.5h and discharge.

[0116] Embodiment 7:

[0117] The wax for packaging material of this embodiment comprises the following raw materials, in parts by weight:

[0118] 58# fully refined paraffin wax: 40 parts

[0119] 75# microcrystalline wax: 25 parts

[0120] Polyester wax: 1 part

[0121] Polyethylene is a mixture of LLDPE and LDPE, with LLDPE accounting for 65wt%: 3 parts APAO: 3 parts

[0122] C5 hydrogenated petroleum resin: 20 parts.

[0123] Process:

[0124] 1. Melt the paraffin wax and polyester wax completely at 120℃, stir and keep warm for 0.5h;

[0125] 2. Add polyethylene and APAO and stir at a constant temperature of 120℃;

[0126] 3. After step 2 is completely melted, add microcrystalline wax and petroleum resin, and stir at a constant temperature of 110°C; 4. After all raw materials are completely melted, continue to stir at a constant temperature of 110°C for 0.5h and discharge.

[0127] Embodiment 8:

[0128] The wax for packaging material of this embodiment comprises the following raw materials, in parts by weight:

[0129] 58# fully refined paraffin wax: 40 parts

[0130] 75# microcrystalline wax: 25 parts

[0131] Polyester wax: 2 parts

[0132] Polyethylene is a mixture of LLDPE and LDPE, with LLDPE accounting for 66wt%: 4 parts SEBS: 2 parts

[0133] C5 hydrogenated petroleum resin: 20 parts.

[0134] Process:

[0135] 1. Melt the paraffin wax and polyester wax completely at 120℃, stir and keep warm for 0.5h;

[0136] 2. Add polyethylene and SEBS and stir at a constant temperature of 120℃;

[0137] 3. After step 2 is completely melted, add microcrystalline wax and petroleum resin, and stir at a constant temperature of 110°C; 4. After all raw materials are completely melted, continue to stir at a constant temperature of 110°C for 0.5h and discharge.

[0138] Embodiment 9:

[0139] The wax for packaging material of this embodiment comprises the following raw materials, in parts by weight:

[0140] 56# fully refined paraffin wax: 40 parts

[0141] 80# microcrystalline wax: 25 parts

[0142] Polyester wax: 2 parts

[0143] The polyethylene is a mixture of LLDPE and LDPE, and LLDPE accounts for 66wt%: 4 parts of SEBS: 2 parts of rosin glycerol resin: 20 parts.

[0144] Process:

[0145] 1. Melt the paraffin wax and polyester wax completely at 120℃, stir and keep warm for 0.5h;

[0146] 2. Add polyethylene and SEBS and stir at a constant temperature of 120℃;

[0147] 3. After step 2 is completely melted, add microcrystalline wax and rosin glycerol resin, and stir at a constant temperature of 110°C; 4. After all raw materials are completely melted, continue to stir at a constant temperature of 110°C for 0.5h and discharge.

[0148] Embodiment 10:

[0149] The wax for packaging material of this embodiment comprises the following raw materials, in parts by weight:

[0150] 56# fully refined paraffin wax: 40 parts

[0151] 80# microcrystalline wax: 25 parts

[0152] Polyester wax: 2 parts

[0153] Polyethylene is a mixture of LLDPE and LDPE, with LLDPE accounting for 66wt%: 4 parts SEBS: 2 parts

[0154] PB: 2 servings

[0155] EVA: 3 parts Terpene resin: 20 parts.

[0156] Process:

[0157] 1. Melt the paraffin wax and polyester wax completely at 120℃, stir and keep warm for 0.5h;

[0158] 2. Add polyethylene, PB, and EVA and stir at a constant temperature of 120°C;

[0159] 3. After step 2 is completely melted, add microcrystalline wax and terpene resin, and stir at a constant temperature of 110°C; 4. After all raw materials are completely melted, continue to stir at a constant temperature of 110°C for 0.5h and discharge.

[0160] Embodiment 11:

[0161] The wax for packaging material of this embodiment comprises the following raw materials, in parts by weight:

[0162] 60# fully refined paraffin wax: 40 parts

[0163] 80# microcrystalline wax: 25 parts

[0164] Polyester wax: 2 parts

[0165] Polyethylene is a mixture of LLDPE and LDPE, with LLDPE accounting for 66wt%: 4 parts SEBS: 2 parts

[0166] APP: 1

[0167] APAO: 4 servings

[0168] C5 hydrogenated petroleum resin: 20 parts.

[0169] Process:

[0170] 1. Melt the paraffin wax and polyester wax completely at 120℃, stir and keep warm for 0.5h;

[0171] 2. Add polyethylene, SEBS, APP, APAO, and stir at a constant temperature of 120°C;

[0172] 3. After step 2 is completely melted, add microcrystalline wax and petroleum resin, and stir at a constant temperature of 110°C; 4. After all raw materials are completely melted, continue to stir at a constant temperature of 110°C for 0.5h and discharge.

[0173] Embodiment 12:

[0174] The wax for packaging material of this embodiment comprises the following raw materials, in parts by weight:

[0175] 58# fully refined paraffin wax: 40 parts

[0176] 75# microcrystalline wax: 25 parts

[0177] Polyester wax: 0.1 parts

[0178] Polyethylene is a mixture of LLDPE and LDPE, with LLDPE accounting for 62wt%: 10 parts APP: 3 parts

[0179] C5 hydrogenated petroleum resin: 20 parts.

[0180] Process:

[0181] 1. Melt the paraffin wax and polyester wax completely at 120℃, stir and keep warm for 0.5h;

[0182] 2. Add polyethylene and APP, stir at 120℃ constant temperature;

[0183] 3. After step 2 is completely melted, add microcrystalline wax and petroleum resin, and stir at a constant temperature of 110°C; 4. After all raw materials are completely melted, continue to stir at a constant temperature of 110°C for 0.5h and discharge.

[0184] Embodiment 13:

[0185] The wax for packaging material of this embodiment comprises the following raw materials, in parts by weight:

[0186] 58# fully refined paraffin wax: 40 parts

[0187] 75# microcrystalline wax: 25 parts

[0188] Polyester wax: 10 parts

[0189] Polyethylene is a mixture of LLDPE and LDPE, and LLDPE accounts for 62wt%: 0.1 parts APP: 3 parts

[0190] C5 hydrogenated petroleum resin: 20 parts.

[0191] Process:

[0192] 1. Melt the paraffin wax and polyester wax completely at 120℃, stir and keep warm for 0.5h;

[0193] 2. Add polyethylene and APP, stir at 120℃ constant temperature;

[0194] 3. After step 2 is completely melted, add microcrystalline wax and petroleum resin, and stir at a constant temperature of 110°C; 4. After all raw materials are completely melted, continue to stir at a constant temperature of 110°C for 0.5h and discharge.

[0195] Embodiment 14:

[0196] The wax for packaging material of this embodiment comprises the following raw materials, in parts by weight:

[0197] 64# fully refined paraffin wax: 40 parts

[0198] 80# microcrystalline wax: 20 parts

[0199] Polyester wax: 5 parts

[0200] Polyethylene is a mixture of LLDPE and LDPE, with LLDPE accounting for 70wt%: 5 parts EVA: 20 parts

[0201] SEBS: 3 parts

[0202] C5 hydrogenated petroleum resin: 10 parts.

[0203] Process:

[0204] 1. Melt the paraffin wax and polyester wax completely at 120℃, stir and keep warm for 0.5h;

[0205] 2. Add polyethylene, EVA and SEBS, and stir at a constant temperature of 120℃;

[0206] 3. After step 2 is completely melted, add microcrystalline wax and petroleum resin, and stir at a constant temperature of 110°C; 4. After all raw materials are completely melted, continue to stir at a constant temperature of 110°C for 0.5h and discharge.

[0207] Embodiment 15:

[0208] The wax for packaging material of this embodiment comprises the following raw materials, in parts by weight:

[0209] 64# fully refined paraffin wax: 40 parts

[0210] 80# microcrystalline wax: 20 parts

[0211] Polyester wax: 5 parts

[0212] Polyethylene is a mixture of LLDPE and LDPE, with LLDPE accounting for 70wt%: 6 parts EVA: 20 parts

[0213] SEBS: 3 parts

[0214] C5 hydrogenated petroleum resin: 10 parts.

[0215] Process:

[0216] 1. Paraffin wax 、 After the polyester wax is completely melted at 120°C, stir and keep warm for 0.5h;

[0217] 2. Add polyethylene, EVA and SEBS, and stir at a constant temperature of 120℃;

[0218] 3. After step 2 is completely melted, add microcrystalline wax and petroleum resin, and stir at a constant temperature of 110°C; 4. After all raw materials are completely melted, continue to stir at a constant temperature of 110°C for 0.5h and discharge.

[0219] Embodiment 16:

[0220] The wax for packaging material of this embodiment comprises the following raw materials, in parts by weight:

[0221] 58# fully refined paraffin wax: 40 parts

[0222] 75# microcrystalline wax: 25 parts

[0223] Polyester wax: 9 parts

[0224] Polyethylene is a mixture of LLDPE and LDPE, with LLDPE accounting for 73wt%: 10 parts PB: 2 parts

[0225] APP: 3 copies

[0226] C5 hydrogenated petroleum resin: 20 parts.

[0227] Process:

[0228] 1. Melt the paraffin wax and polyester wax completely at 120℃, stir and keep warm for 0.5h;

[0229] 2. Add polyethylene, PB and APP, and stir at a constant temperature of 120℃;

[0230] 3. After step 2 is completely melted, add microcrystalline wax and petroleum resin, and stir at a constant temperature of 110°C; 4. After all raw materials are completely melted, continue to stir at a constant temperature of 110°C for 0.5h and discharge.

[0231] Embodiment 17:

[0232] The wax for packaging material of this embodiment comprises the following raw materials, in parts by weight:

[0233] 58# fully refined paraffin wax: 40 parts

[0234] 75# microcrystalline wax: 25 parts

[0235] Polyester wax: 10 parts

[0236] Polyethylene is a mixture of LLDPE and LDPE, with LLDPE accounting for 75wt%: 10 parts PB: 2 parts

[0237] APP: 3 copies

[0238] C5 hydrogenated petroleum resin: 20 parts.

[0239] Process:

[0240] 1. Melt the paraffin wax and polyester wax completely at 120℃, stir and keep warm for 0.5h;

[0241] 2. Add polyethylene, PB and APP, and stir at a constant temperature of 120℃;

[0242] 3. After step 2 is completely melted, add microcrystalline wax and petroleum resin, and stir at a constant temperature of 110°C; 4. After all raw materials are completely melted, continue to stir at a constant temperature of 110°C for 0.5h and discharge.

[0243] Embodiment 18:

[0244] The wax for packaging material of this embodiment comprises the following raw materials, in parts by weight:

[0245] 64# fully refined paraffin wax: 40 parts

[0246] 80# microcrystalline wax: 20 parts

[0247] Polyester wax: 10 parts

[0248] Polyethylene is a mixture of LLDPE and LDPE, with LLDPE accounting for 70wt%: 5 parts EVA: 20 parts

[0249] SEBS: 3 parts

[0250] C5 hydrogenated petroleum resin: 10 parts.

[0251] Process:

[0252] 1. Melt the paraffin wax and polyester wax completely at 120℃, stir and keep warm for 0.5h;

[0253] 2. Add polyethylene, EVA and SEBS, and stir at a constant temperature of 120℃;

[0254] 3. After step 2 is completely melted, add microcrystalline wax and petroleum resin, and stir at a constant temperature of 110°C; 4. After all raw materials are completely melted, continue to stir at a constant temperature of 110°C for 0.5h and discharge.

[0255] Embodiment 19:

[0256] The wax for packaging material of this embodiment comprises the following raw materials, in parts by weight:

[0257] 64# fully refined paraffin wax: 40 parts

[0258] 80# microcrystalline wax: 20 parts

[0259] Polyester wax: 5 parts

[0260] Polyethylene is a mixture of LLDPE and LDPE, with LLDPE accounting for 70wt%: 10 parts EVA: 20 parts

[0261] SEBS: 3 parts

[0262] C5 hydrogenated petroleum resin: 10 parts.

[0263] Process:

[0264] 1. Place paraffin wax 、 After the polyester wax is completely melted at 120°C, stir and keep warm for 0.5h;

[0265] 2. Add polyethylene, EVA and SEBS, and stir at a constant temperature of 120℃;

[0266] 3. After step 2 is completely melted, add microcrystalline wax and petroleum resin and stir at a constant temperature of 110°C;

[0267] 4. After all the raw materials are completely melted, continue stirring at a constant temperature of 110℃ for 0.5h and then discharge the material.

[0268] Compare the indicators with two products on the market (Comparative Example 1 is liquid paraffin, and Comparative Example 2 is 80# microcrystalline wax)

[0269]

[0270]

[0271] By comparing and analyzing the above results, it is found that the kinematic viscosity of comparative example 1 is very low, resulting in almost no wax layer on the surface of the paperboard during wax coating, which seriously affects the waterproof performance, low temperature performance and adhesion. The kinematic viscosity of comparative example 2 is very large, and other raw materials need to be added for dilution before the wax coating can be smoothly applied, which seriously affects the production efficiency, but its adhesion is excellent. The kinematic viscosity of Examples 1-5 is slightly low, resulting in insufficient thickness of the wax layer on the surface of the paperboard, resulting in reduced adhesion. The kinematic viscosity, waterproof performance, low temperature performance and adhesion of Examples 6-13 are relatively ideal, among which the various physical and chemical indicators, tooling indicators and application indicators of Examples 14-15 are relatively good. Examples 16-19 are similar to comparative example 2, and excessive viscosity makes wax coating difficult.

[0272] The mechanical properties of the wax coated cartons are shown in the following table.

[0273]

[0274]

[0275] From the mechanical properties data, it can be found that the quality of the wax layer and the film thickness have a great influence on the mechanical properties of the carton. The harder the wax film and the thicker the film, the better the mechanical properties will be.

[0276] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be considered exemplary and non-restrictive in all respects, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims be included in the present invention.

[0277] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A wax for packaging material, the raw materials of which include, by weight: Food grade fully refined paraffin: 40-70 parts; Microcrystalline wax: 15-40 parts; Additives: 1-20 parts; Polyester wax: 0-10 parts; Polyethylene: 0-10 parts; Petroleum resin: 20-45 parts.

2. The wax for packaging materials according to claim 1, characterized in that: The food-grade fully refined paraffin wax is selected from: 56# fully refined paraffin wax, 58# fully refined paraffin wax, 62# fully refined paraffin wax, and 64# fully refined paraffin wax.

3. The wax for packaging materials according to claim 1, characterized in that: The microcrystalline wax is selected from: 75# microcrystalline wax and 80# microcrystalline wax.

4. The wax for packaging materials according to claim 1, characterized in that: The auxiliary agent is selected from: amorphous alpha olefin, ethylene-vinyl acetate copolymer, random copolymer polypropylene, styrene-butylene-styrene block copolymer, and polybutene.

5. The wax for packaging materials according to claim 1, characterized in that: The petroleum resin is selected from: C5 petroleum resin, C5 hydrogenated petroleum resin, rosin glycerol ester, and terpene resin.

6. The wax for packaging materials according to claim 1, characterized in that: The polyethylene is selected from LLDPE and LDPE.

7. The wax for packaging materials according to claim 6, characterized in that: The polyethylene is a mixture of LLDPE and LDPE, and the LLDPE accounts for 65-75% by weight.

8. The wax for packaging materials according to claim 1, characterized in that: The polyester wax is obtained by bulk polymerization using the following raw materials, calculated in parts by weight: 1200 parts of tert-butyl carbonate Initiator 3.6 parts Chain transfer agent 12 parts.

9. Packaging paper, comprising a paper body and a coating formed on at least one side thereof and obtained from the wax for packaging material according to any one of claims 1 to 8.

10. A packaging article, comprising a box-shaped body having a hollow structure, wherein the box-shaped body is prepared from the packaging paper according to claim 9.

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