阅读说明：本技术 适用于pp人造合成纸表面涂布用单组份乳液及其合成方法 (Single-component emulsion suitable for coating surface of PP (polypropylene) artificial synthetic paper and synthetic method thereof ) 是由 杨新峰 施春燕 于 2020-12-24 设计创作，主要内容包括：本发明涉及适用于PP人造合成纸表面涂布用单组份乳液及其合成方法,其特征在于,在聚合工艺后段预乳化单体剩余60％-1％时,特殊单体加入预乳化釜滴加,参与聚合反应,提高了特殊单体使用效率,在烘干成膜过程中,因为后段加入,使得特殊单体被其他单体包裹在乳胶粒子内部情形大大减少,提高了特殊单体在成膜阶段参与交联反应的效率,减少了特殊单体使用量,达到了特殊单体更多用量同样的效果。(The invention relates to a single-component emulsion suitable for coating the surface of PP synthetic paper and a synthesis method thereof, which is characterized in that when 60-1% of pre-emulsified monomers remain at the rear section of a polymerization process, special monomers are added into a pre-emulsifying kettle in a dropwise adding manner to participate in polymerization reaction, so that the use efficiency of the special monomers is improved, and in the drying and film forming process, because of the rear section addition, the situation that the special monomers are wrapped inside latex particles by other monomers is greatly reduced, the efficiency of the special monomers participating in crosslinking reaction at the film forming stage is improved, the use amount of the special monomers is reduced, and the same effect of more special monomers is achieved.)

1. The single-component emulsion suitable for coating the surface of the PP synthetic paper is characterized by comprising the following components in percentage by weight:

2. the one-component emulsion suitable for surface coating of PP synthetic paper as claimed in claim 1, wherein: one or more of styrene or methyl methacrylate is adopted as the hard monomer.

3. The one-component emulsion suitable for surface coating of PP synthetic paper as claimed in claim 1, wherein: the soft monomer is one or more of 2-ethylhexyl acrylate, butyl acrylate and other soft monomers.

4. The one-component emulsion suitable for surface coating of PP synthetic paper as claimed in claim 1, wherein: the cross-linking agent is one or more of diacetone acrylamide and acetoacetoxyethyl methacrylate.

5. The one-component emulsion suitable for surface coating of PP synthetic paper as claimed in claim 1, wherein: the first film auxiliary agent adopts one or more of dipropylene glycol butyl ether, methyl ether and ethyl ether.

6. The one-component emulsion suitable for surface coating of PP synthetic paper as claimed in claim 1, wherein: the diacetone acrylamide and the adipic dihydrazide generate a crosslinking reaction in the drying process of the emulsion to generate adhesive force.

7. The method for synthesizing the one-component emulsion suitable for coating the surface of the PP synthetic paper, which is disclosed by claim 1, is characterized by comprising the following steps of: the acrylic emulsion polymerization process comprises the following process steps:

s1 adding 1-5% of deionized water, 1-3% of emulsifier and monomers except cross-linking agent, adipic dihydrazide, film assistant and alcohol ester into a pre-emulsifying kettle, quickly stirring for 10-30 minutes, and taking out 1-10% of seed pre-emulsion for later use;

adding deionized water into an S2 reaction kettle, heating to 82 ℃, adding the S1 seed pre-emulsion, and simultaneously adding 1-5% of ammonium persulfate as an initiator, and finishing the reaction within 30 minutes;

s3, beginning to drip the residual pre-emulsion in the pre-emulsion kettle, wherein the dripping time is controlled to be 2-5 hours, and the reaction temperature is kept at 78-85 ℃;

s4, stopping dripping when the pre-emulsion is dripped to the residual 60-1 percent, adding the cross-linking agent, stirring for 1-20 minutes, continuing dripping, controlling the reaction temperature at 78-85 ℃, and preserving the heat for 30-120 minutes after the dripping is finished;

s5, cooling to 65-75 ℃, adding 1% -3% of tert-butyl hydroperoxide in the reaction kettle in a dropwise manner, and stirring for 5-30 minutes;

s6, 0.1-3% of sodium formaldehyde sulfoxylate is dripped, the dripping is carried out for 5-30 minutes, and the heat preservation is carried out for 5-60 minutes after the dripping is finished;

s7 is cooled to below 50 ℃, 0.2 to 3 percent of ammonia water, 0.5 to 5 percent of adipic dihydrazide, 0.5 to 5 percent of dipropylene glycol butyl ether and 0.5 to 5 percent of alcohol ester are added in sequence, stirred for 5 to 30 minutes, filtered by a 200-mesh filter screen and discharged.

8. The method for synthesizing the one-component emulsion suitable for coating the surface of the PP synthetic paper as claimed in claim 7, wherein the method comprises the following steps: the cross-linking agent is a mixture of diacetone acrylamide and acetoacetoxyethyl methacrylate.

Technical Field

The invention relates to the technical field of film coating, in particular to a single-component emulsion suitable for coating the surface of PP (polypropylene) synthetic paper and a synthesis method thereof.

Background

Along with the development of society, the digital development of commodity circulation, express delivery, logistics and the uniqueness and traceability of each commodity, the requirements of uniqueness, rapidness, convenience in use and the like of each commodity label are promoted, the PP artificial synthetic paper label has various advantages of economy, water resistance, no breakage in tearing, alcohol wiping resistance, moisture resistance, rapidness in use and the like due to the fact that the PP artificial synthetic paper label is produced, the PP artificial synthetic paper label is rapidly developed in recent years and gradually replaces part of paper, and the PP artificial synthetic paper has the most key technology that a coating coated on the surface has various paper-like properties, so that various harsh requirements are provided for surface coating emulsion.

In the prior art, some domestic companies adopt a two-step coating method, namely, a layer of primer with good adhesive force is coated on the surface of a thin film of the PP synthetic paper in advance for the first time, and after drying, a layer of functional coating is coated on the primer so as to realize the purpose of replacing paper with the film.

Aiming at the fact that the one-step coating technology of the PP artificial synthetic paper is still blank in China, the one-step coating technology is urgently needed to replace the existing two-step coating method, the production efficiency can be greatly improved, and the energy consumption and the cost can be greatly reduced on the premise of ensuring the adhesive force. Under the conditions that the code printing label industry is rapidly developed and the supply of products is not in demand, the production efficiency is greatly improved, and the method is undoubtedly a major breakthrough.

Disclosure of Invention

The invention aims to solve the technical problem of improving the emulsion adhesive force of acrylic emulsion when coating on the surface of PP synthetic paper, and provides a single-component emulsion formula for high-adhesive-force coating and a synthesis method thereof.

The invention is realized by the following technical scheme:

the invention provides a single-component emulsion suitable for coating the surface of PP (polypropylene) artificial synthetic paper, which comprises the following components in percentage by weight:

the invention adopts special monomers: diacetone acrylamide and adipic dihydrazide, a special monomer generates a crosslinking reaction in the emulsion drying process, and partial reaction groups and functional groups on the surface of the film generate a chemical reaction in the crosslinking reaction process, so that the single-component acrylic emulsion disclosed by the invention generates adhesive force on the surface of the artificial pp film. The diacetone acrylamide and the adipic dihydrazide adopt a special polymerization process, and after emulsion drying and crosslinking are finished, the emulsion has excellent alcohol scratch resistance.

Preferably, one or more of styrene or methyl methacrylate is used as the hard monomer.

Preferably, the soft monomer is one or more of 2-ethylhexyl acrylate, butyl acrylate and the like.

Preferably, the crosslinking agent adopts one or more of diacetone acrylamide and acetoacetoxyethyl methacrylate.

Preferably, the membrane auxiliary agent adopts one or more of dipropylene glycol butyl ether, methyl ether and ethyl ether. The invention uses the dipropylene glycol butyl ether and the alcohol ester twelve as film forming additives, the boiling point of the dipropylene glycol butyl ether is 222-232 ℃, the dipropylene glycol butyl ether can permeate into acrylic emulsion latex particles due to the special molecular structure after being added into the acrylic emulsion, and in the coating drying process, the acrylic emulsion coating is effectively assisted to form a film due to the special chemical structure and the boiling point, so that high-speed coating is possible (300 meters per minute and above), and the low-cost alcohol ester twelve is added in a proper proportion, so that the production efficiency and the yield are greatly improved.

Preferably, diacetone acrylamide and adipic dihydrazide produce a crosslinking reaction during the drying of the emulsion, resulting in adhesion.

The invention also provides a synthetic method of the single-component emulsion suitable for coating the surface of the PP synthetic paper, which is characterized by comprising the following steps: the acrylic emulsion polymerization process comprises the following process steps:

s1 adding 1-5% of deionized water, 1-3% of emulsifier and monomers except cross-linking agent, adipic dihydrazide, film assistant and alcohol ester into a pre-emulsifying kettle, quickly stirring for 10-30 minutes, and taking out 1-10% of seed pre-emulsion for later use;

adding deionized water into an S2 reaction kettle, heating to 82 ℃, adding the S1 seed pre-emulsion, and simultaneously adding 1-5% of ammonium persulfate as an initiator, and finishing the reaction within 30 minutes;

s3, beginning to drip the residual pre-emulsion in the pre-emulsion kettle, wherein the dripping time is controlled to be 2-5 hours, and the reaction temperature is kept at 78-85 ℃;

s4, stopping dripping when the pre-emulsion is dripped to the residual 60-1 percent, adding the cross-linking agent, stirring for 1-20 minutes, continuing dripping, controlling the reaction temperature at 78-85 ℃, and preserving the heat for 30-120 minutes after the dripping is finished;

s5, cooling to 65-75 ℃, adding 1% -3% of tert-butyl hydroperoxide in the reaction kettle in a dropwise manner, and stirring for 5-30 minutes;

s6, 0.1-3% of sodium formaldehyde sulfoxylate is dripped, the dripping is carried out for 5-30 minutes, and the heat preservation is carried out for 5-60 minutes after the dripping is finished;

s7 is cooled to below 50 ℃, 0.2 to 3 percent of ammonia water, 0.5 to 5 percent of adipic dihydrazide, 0.5 to 5 percent of dipropylene glycol butyl ether and 0.5 to 5 percent of alcohol ester are added in sequence, stirred for 5 to 30 minutes, filtered by a 200-mesh filter screen and discharged.

The special monomer adding process comprises the following steps: the residual (60-1)% of the pre-emulsified monomers at the later stage of the polymerization process are added into a pre-emulsifying kettle to be dripped into the polymerization reaction, so that the use efficiency of the special monomers is improved, and in the drying and film-forming process, the situation that the special monomers are wrapped inside latex particles by other monomers is greatly reduced due to the addition at the later stage, the efficiency of the special monomers participating in the crosslinking reaction at the film-forming stage is improved, the use amount of the special monomers is reduced, and the same effect of more special monomers is achieved.

The invention has the beneficial effects that: the novel single-component acrylic emulsion is used, the PP synthetic paper coating production process is changed, namely, a one-time coating technology is adopted, the production efficiency is improved, the energy consumption is saved, and the production cost is reduced; under the basis that not only satisfied various operation requirements, can guarantee the adhesive force again, do not fall the powder, toast equipment only needs one set, increased substantially production efficiency, reduced the energy consumption, practice thrift the cost, at the quick development of sign indicating number label trade, under the condition that the product supply is short of requisites, machine boot speed promotes by a wide margin, the promotion by a wide margin of production efficiency, the purchase production facility fund of having practiced thrift undoubtedly for the low reaches mill has made the rapid development, manpower and materials all reduce correspondingly, increased substantially production efficiency, practice thrift the cost, the yield greatly improves, huge economic benefits has been created.

The anionic emulsifier is used in combination with the nonionic emulsifier, the anionic emulsifier improves the mechanical stability of latex particles, the nonionic emulsifier improves the electrolyte stability of the latex particles, the anionic emulsifier adopts ammonium salt and sodium salt containing fatty alcohol-polyoxyethylene ether, the nonionic emulsifier adopts (9-40) EO number fatty alcohol-polyoxyethylene ether emulsifier, the ratio of the usage amount of the effective content of the nonionic emulsifier to the usage amount of the effective content of the anionic emulsifier is (1-2), the production stability and the calcium ion stability of the acrylic emulsion are greatly improved, the batch stable production is possible, and the use requirements of downstream customers are met.

Detailed Description

The technical solutions of the present invention are further described below with reference to examples, which are believed to be clear to those skilled in the art.

Example one

The one-component emulsion suitable for coating the surface of the PP synthetic paper comprises the following components in percentage by weight:

in this embodiment, a method for synthesizing a single-component emulsion suitable for coating the surface of PP synthetic paper adopts an acrylic emulsion polymerization process, and includes the following process steps:

s1 adding deionized water 1.5%, emulsifier 1%, and monomers except diacetone acrylamide, acetoacetoxyethyl methacrylate, adipic dihydrazide, dipropylene glycol butyl ether, and alcohol ester twelve, stirring rapidly for 10 min, taking out 1% of the seed pre-emulsion for use,

adding deionized water into an S2 reaction kettle, heating to 82 ℃, adding the seed pre-emulsion, adding an initiator 2% of ammonium persulfate, finishing the reaction within 30 minutes,

s3, dropwise adding the residual pre-emulsion in the pre-emulsification kettle, controlling the dropwise adding time to be 2 hours, keeping the reaction temperature at 78 ℃,

s4, stopping dripping when the residual 60-1 percent of the pre-emulsion is dripped, adding diacetone acrylamide and acetoacetoxyethyl methacrylate, stirring for 2 minutes, continuing dripping, controlling the reaction temperature at 78 ℃, preserving the heat for 30 minutes after the dripping is finished,

s5, cooling to 65 ℃, dropwise adding 1% of tert-butyl hydroperoxide in the reaction kettle, stirring for 5 minutes,

s6, 0.1 percent of sodium formaldehyde sulfoxylate is dripped for 5 minutes, the temperature is kept for 10 minutes after the dripping is finished,

s7 is cooled to below 50 ℃, 0.2 percent of ammonia water, 0.5 percent of adipic dihydrazide, 1 percent of dipropylene glycol butyl ether and twelve 5 percent of alcohol ester are added in sequence, stirred for 10 minutes, filtered by a 200-mesh filter screen and discharged.

Example two

The one-component emulsion suitable for coating the surface of the PP synthetic paper comprises the following components in percentage by weight:

in this embodiment, a method for synthesizing a single-component emulsion suitable for coating the surface of PP synthetic paper adopts an acrylic emulsion polymerization process, and includes the following process steps:

s1 adding deionized water 2.5%, emulsifier 2%, and monomers except diacetone acrylamide, acetoacetoxyethyl methacrylate, adipic dihydrazide, dipropylene glycol butyl ether, and alcohol ester twelve, stirring rapidly for 20 min, taking out 5% of the seed pre-emulsion for use,

adding deionized water into an S2 reaction kettle, heating to 82 ℃, adding the seed pre-emulsion, adding an initiator 2% of ammonium persulfate, finishing the reaction within 30 minutes,

s3, dropwise adding the residual pre-emulsion in the pre-emulsification kettle, controlling the dropwise adding time to be 3 hours, keeping the reaction temperature at 80 ℃,

s4, stopping dripping when the residual 60-1 percent of the pre-emulsion is dripped, adding diacetone acrylamide and acetoacetoxyethyl methacrylate, stirring for 10 minutes, continuing dripping, controlling the reaction temperature at 80 ℃, preserving the heat for 60 minutes after the dripping is finished,

s5 is cooled to 70 ℃, 1.5 percent of tert-butyl hydroperoxide is added into the reaction kettle in a dropwise manner, after stirring for 15 minutes,

s6, 2 percent of sodium formaldehyde sulfoxylate is dripped into the mixture for 10 minutes, the temperature is kept for 25 minutes after the dripping is finished,

s7 is cooled to below 50 ℃, 0.5 percent of ammonia water, 0.5 percent of adipic dihydrazide, 1 percent of dipropylene glycol butyl ether and twelve 2 percent of alcohol ester are added in sequence, stirred for 20 minutes, filtered by a 200-mesh filter screen and discharged.

EXAMPLE III

The one-component emulsion suitable for coating the surface of the PP synthetic paper comprises the following components in percentage by weight:

in this embodiment, a method for synthesizing a single-component emulsion suitable for coating the surface of PP synthetic paper adopts an acrylic emulsion polymerization process, and includes the following process steps:

s1 adding deionized water 5%, emulsifier 2.5%, and monomers except diacetone acrylamide, acetoacetoxyethyl methacrylate, adipic dihydrazide, dipropylene glycol butyl ether, and alcohol ester twelve, stirring rapidly for 30 min, taking out 10% of the seed pre-emulsion for use,

adding deionized water into an S2 reaction kettle, heating to 82 ℃, adding the seed pre-emulsion, adding 1% of ammonium persulfate initiator, finishing the reaction within 30 minutes,

s3, dropwise adding the residual pre-emulsion in the pre-emulsification kettle, controlling the dropwise adding time to be 5 hours, keeping the reaction temperature at 85 ℃,

s4, stopping dripping when the residual 60-1 percent of the pre-emulsion is dripped, adding diacetone acrylamide and acetoacetoxyethyl methacrylate, stirring for 20 minutes, continuing dripping, controlling the reaction temperature at 85 ℃, preserving the heat for 120 minutes after the dripping is finished,

s5, cooling to 75 ℃, dropwise adding 1% of tert-butyl hydroperoxide in the reaction kettle, stirring for 30 minutes,

s6 dropwise adding the rongalite 3 percent, dropwise adding the rongalite 30 minutes, preserving the heat for 60 minutes after the dropwise adding is finished,

s7 is cooled to below 50 ℃, 1 percent of ammonia water, 0.5 percent of adipic dihydrazide, 0.5 percent of dipropylene glycol butyl ether and 0.5 percent of alcohol ester are added in sequence, stirred for 30 minutes, filtered by a 200-mesh filter screen and discharged.

Example four

In the above embodiments I to III

Styrene, a hard monomer, may be replaced by methyl methacrylate or a mixture of styrene and methyl methacrylate.

The soft monomer, 2-ethylhexyl acrylate, may be replaced by butyl acrylate or a mixture of butyl acrylate and 2-ethylhexyl acrylate.

Diacetone acrylamide as the crosslinking agent may be replaced with acetoacetoxyethyl methacrylate or a mixture of diacetone acrylamide and acetoacetoxyethyl methacrylate.

The dipropylene glycol butyl ether of the first film auxiliary agent can be replaced by methyl ether or ethyl ether.

EXAMPLE five

The invention adopts one-time coating, the first time coats an adhesive force coating on the surface of the pp film, and the coating is dried. Meanwhile, the requirements of adhesive force and functional coatings are met, only one set of baking equipment is needed, energy consumption is greatly reduced, the starting speed of the machine is greatly increased, manpower and material resources are correspondingly reduced, production efficiency is greatly improved, cost is saved, the rate of finished products is greatly improved, and huge economic benefits are created.