阅读说明：本技术 一种可回收、可热封、隔油隔水的改性纸张及其制作工艺 (Recyclable, heat-sealable, oil-proof and water-proof modified paper and manufacturing process thereof ) 是由 祁磊磊 于 2020-08-03 设计创作，主要内容包括：本发明公开了一种可回收、可热封、隔油隔水的改性纸张及其制作工艺,所述改性纸张包括基层纸,基层纸的上、下表面均涂布有一层上树脂乳液层和下树脂乳液层；其制作工艺包括以下步骤：(1)仪器准备：在四口烧瓶上装好搅拌器、温度计和填充柱,充入氮气；(2)加入原料；(3)加热及保温酯化；(4)回流酯化；(5)降温及出料；(6)搅拌及过滤后,即得到外观为乳白色的树脂乳液；(7)涂布：在纸张复合机上用涂布辊将步骤(6)的树脂乳液辊涂到纸张的一面,过烘箱后收卷,同样方法辊涂纸张的另一面,收卷后得到改性纸张的成品。本发明在保留现有同类纸张优点前提下,并且实现可降解,成本低,不用受国外技术垄断的约束。(The invention discloses a recyclable, heat-sealable, oil-and water-proof modified paper and a manufacturing process thereof, wherein the modified paper comprises base paper, and an upper resin emulsion layer and a lower resin emulsion layer are coated on the upper surface and the lower surface of the base paper; the manufacturing process comprises the following steps: (1) preparing an instrument: a stirrer, a thermometer and a packed column are arranged on the four-mouth flask, and nitrogen is filled; (2) adding raw materials; (3) heating and insulating esterification; (4) carrying out reflux esterification; (5) cooling and discharging; (6) stirring and filtering to obtain milky resin emulsion; (7) coating: and (3) rolling the resin emulsion in the step (6) on one surface of the paper by using a coating roller on a paper compounding machine, rolling the paper after passing through an oven, rolling the other surface of the paper by the same method, and obtaining a finished product of the modified paper after rolling. The invention can realize degradability and low cost without being restricted by the monopoly of foreign technology on the premise of keeping the advantages of the prior similar paper.)

1. The utility model provides a recoverable, modified paper of heat-sealable, oil removal water proof which characterized in that: comprises base paper, wherein the upper surface and the lower surface of the base paper are coated with an upper resin emulsion layer and a lower resin emulsion layer.

2. The recyclable, heat-sealable, oil and water barrier modified paper sheet of claim 1, wherein: the upper resin emulsion layer and the lower resin emulsion layer are both polyester resin emulsion layers.

3. A manufacturing process of recyclable, heat-sealable, oil-and water-proof modified paper is characterized in that: the method comprises the following steps:

(1) preparing an instrument: a stirrer, a thermometer and a packed column are arranged on the four-mouth flask, and nitrogen is filled;

(2) adding raw materials: adding hexahydrophthalic anhydride, trimethylolpropane, neopentyl glycol, dicarboxylic acid, adipic acid and an esterification catalyst into a four-neck flask, and sealing a feeding port;

(3) heating and heat preservation esterification: heating to 170 ℃, stopping filling nitrogen, continuously heating to 240 ℃, preserving heat and esterifying for 4 hours;

(4) and (3) refluxing and esterifying: replacing the packed column, installing a reflux condenser, adding reflux distilled water, carrying out heat preservation and reflux esterification at 200 ℃, detecting the acid value every 1 hour in the heat preservation and reflux process, and cooling the acid value to 5-10mg KOH/g;

(5) cooling and discharging: cooling to 170 ℃, adding maleic anhydride, preserving heat for 2 hours at the temperature of 175-180 ℃, cooling when the acid value and the viscosity are qualified (the acid value is controlled to be 25-35mg KOH/g), and vacuumizing and extracting the reflux xylene while cooling; cooling to 130 ℃, adding ethylene glycol monobutyl ether for dilution, and controlling the solid content to be 90% and discharging;

(6) stirring and filtering: putting the obtained resin into a glass beaker, cooling to about 105 ℃, starting a high-speed stirrer, adding dimethylethanolamine at 3000r/min for neutralization, stirring for 10min, adding deionized water to control the resin solid content to be 40%, controlling the pH to be 6.5-7.2, and filtering to obtain milky resin emulsion;

(7) coating: and (3) rolling the resin emulsion in the step (6) on one surface of the paper by using a coating roller on a paper compounding machine, rolling the paper after passing through an oven, rolling the other surface of the paper by the same method, and obtaining a finished product of the modified paper after rolling.

4. The process for manufacturing the recyclable, heat-sealable, oil and water barrier modified paper as claimed in claim 3, wherein the process comprises the steps of: the stirrer is a GZ120-S digital display type powerful electric stirrer.

5. The process for manufacturing the recyclable, heat-sealable, oil and water barrier modified paper as claimed in claim 3, wherein the process comprises the steps of: the heat preservation process in the steps (3), (4) and (5) adopts ZNHW type intelligent constant temperature electric heating jacket or PTHE type common constant temperature electric heating jacket.

Technical Field

The invention relates to a paper manufacturing process, in particular to recyclable, heat-sealable, oil-proof and water-proof modified paper and a manufacturing process thereof.

Background

At present, the modified paper technology mainly comprises the following two types, wherein one type is that polyethylene is coated on the front side and the back side of paper, and the modified paper technology has the advantages that: sanitary, economical and practical (one square 2.2 yuan), mature process production, heat sealing, oil and water isolation. The disadvantages are that: the product is not recyclable and not degradable (the polyethylene film coated with the film needs more than 200 years for degradation). Secondly, the polyolefin is roller-coated on the front and back sides of the paper, and the advantages are that: degradable, heat-sealable, oil-and water-proof. The disadvantages are that: the technology is monopolized by foreign manufacturers (only Mitsubishi, Germany Basff can produce the product at the present stage), and the cost is too high (3.9-5.7 yuan per square meter). Therefore, it is an urgent need to solve the problem of the technical staff in the field to develop a recyclable, heat-sealable, oil-and water-proof modified paper and a manufacturing process thereof.

Disclosure of Invention

The invention aims to solve the defects and provides recyclable, heat-sealable, oil-proof and water-proof modified paper and a manufacturing process thereof.

The above object of the present invention is achieved by the following technical means: the utility model provides a recoverable, modified paper of heat-sealable, oil removal water proof which characterized in that: comprises base paper, wherein the upper surface and the lower surface of the base paper are coated with an upper resin emulsion layer and a lower resin emulsion layer.

Further, the upper resin emulsion layer and the lower resin emulsion layer are both polyester resin emulsion layers.

The invention relates to a manufacturing process of recyclable, heat-sealable, oil-and water-proof modified paper, which comprises the following steps:

(1) preparing an instrument: a stirrer, a thermometer and a packed column are arranged on the four-mouth flask, and nitrogen is filled;

(2) adding raw materials: adding hexahydrophthalic anhydride, trimethylolpropane, neopentyl glycol, dicarboxylic acid, adipic acid and an esterification catalyst into a four-neck flask, and sealing a feeding port;

(3) heating and heat preservation esterification: heating to 170 ℃, stopping filling nitrogen, continuously heating to 240 ℃, preserving heat and esterifying for 4 hours;

(4) and (3) refluxing and esterifying: replacing the packed column, installing a reflux condenser, adding reflux distilled water, carrying out heat preservation and reflux esterification at 200 ℃, detecting the acid value every 1 hour in the heat preservation and reflux process, and cooling the acid value to 5-10mg KOH/g;

(5) cooling and discharging: cooling to 170 ℃, adding maleic anhydride, preserving heat for 2 hours at the temperature of 175-180 ℃, cooling when the acid value and the viscosity are qualified (the acid value is controlled to be 25-35mg KOH/g), and vacuumizing and extracting the reflux xylene while cooling; cooling to 130 ℃, adding ethylene glycol monobutyl ether for dilution, and controlling the solid content to be 90% and discharging;

(6) stirring and filtering: putting the obtained resin into a glass beaker, cooling to about 105 ℃, starting a high-speed stirrer, adding dimethylethanolamine at 3000r/min for neutralization, stirring for 10min, adding deionized water to control the resin solid content to be 40%, controlling the pH to be 6.5-7.2, and filtering to obtain milky resin emulsion;

(7) coating: and (3) rolling the resin emulsion in the step (6) on one surface of the paper by using a coating roller on a paper compounding machine, rolling the paper after passing through an oven, rolling the other surface of the paper by the same method, and obtaining a finished product of the modified paper after rolling.

Further, the stirrer is a GZ120-S digital display type powerful electric stirrer.

Further, the heat preservation process in the steps (3), (4) and (5) adopts ZNHW type intelligent constant temperature electric heating jackets or PTHE type common constant temperature electric heating jackets.

When the modified paper is used, printing ink is printed on the surface of the layer by a printing machine according to different order requirements, and the modified paper is subjected to heat sealing by a heat sealing machine according to different purposes to be made into paper garbage bags (used in motor cars, high-speed rails, airports and the like), paper packaging bags, paper protection bags and the like.

Compared with the prior art, the invention has the advantages that: the invention can realize degradability and low cost without being restricted by the monopoly of foreign technology on the premise of keeping the advantages of the prior similar paper.

Drawings

Fig. 1 is a schematic structural view of the present invention.

Detailed Description

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

As shown in fig. 1, the recyclable, heat-sealable, oil-and water-proof modified paper comprises a base paper 1, wherein an upper resin emulsion layer 2 and a lower resin emulsion layer 3 are coated on the upper surface and the lower surface of the base paper 1.

Further, the upper resin emulsion layer 2 and the lower resin emulsion layer 3 are both polyester resin emulsion layers.

The invention relates to a manufacturing process of recyclable, heat-sealable, oil-and water-proof modified paper, which comprises the following steps:

(1) preparing an instrument: a stirrer, a thermometer and a packed column are arranged on the four-mouth flask, and nitrogen is filled;

(2) adding raw materials: adding hexahydrophthalic anhydride, trimethylolpropane, neopentyl glycol, dicarboxylic acid, adipic acid and an esterification catalyst into a four-neck flask, and sealing a feeding port;

(3) heating and heat preservation esterification: heating to 170 ℃, stopping filling nitrogen, continuously heating to 240 ℃, preserving heat and esterifying for 4 hours;

(4) and (3) refluxing and esterifying: replacing the packed column, installing a reflux condenser, adding reflux distilled water, carrying out heat preservation and reflux esterification at 200 ℃, detecting the acid value every 1 hour in the heat preservation and reflux process, and cooling the acid value to 5-10mg KOH/g;

(5) cooling and discharging: cooling to 170 ℃, adding maleic anhydride, preserving heat for 2 hours at the temperature of 175-180 ℃, cooling when the acid value and the viscosity are qualified (the acid value is controlled to be 25-35mg KOH/g), and vacuumizing and extracting the reflux xylene while cooling; cooling to 130 ℃, adding ethylene glycol monobutyl ether for dilution, and controlling the solid content to be 90% and discharging;

(6) stirring and filtering: putting the obtained resin into a glass beaker, cooling to about 105 ℃, starting a high-speed stirrer, adding dimethylethanolamine at 3000r/min for neutralization, stirring for 10min, adding deionized water to control the resin solid content to be 40%, controlling the pH to be 6.5-7.2, and filtering to obtain milky resin emulsion;

(7) coating: and (3) rolling the resin emulsion in the step (6) on one surface of the paper by using a coating roller on a paper compounding machine, rolling the paper after passing through an oven, rolling the other surface of the paper by the same method, and obtaining a finished product of the modified paper after rolling.

Further, the stirrer is a GZ120-S digital display type powerful electric stirrer.

Further, the heat preservation process in the steps (3), (4) and (5) adopts ZNHW type intelligent constant temperature electric heating jackets or PTHE type common constant temperature electric heating jackets.

When the modified paper is used, printing ink is printed on the surface of the layer by a printing machine according to different order requirements, and the modified paper is subjected to heat sealing by a heat sealing machine according to different purposes to be made into paper garbage bags (used in motor cars, high-speed rails, airports and the like), paper packaging bags, paper protection bags and the like.

The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes performed by the present specification and drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.