阅读说明：本技术 一种用于生产丁苯胶乳的种子胶乳 (It is a kind of for producing the seed latex of styrene-butadiene latex ) 是由 张连腾 米普科 衣振东 杨涛 陈翠 张志高 张健 李福荣 姚丽君 于 2019-07-18 设计创作，主要内容包括：本发明涉及乳液聚合共聚物胶乳技术领域,具体地说,是一种用于生产丁苯胶乳的种子胶乳。所述的种子胶乳由如下单体通过乳液聚合而成,所述单体按照质量百分比包括：丁二烯单体：5～20wt％；苯乙烯单体：70～90wt％；不饱和羧酸：2.0～6.5wt％；所述种子胶乳的玻璃化转变温度为45～80℃；粒径为30～40nm；电位为-15～-25mv。采用本发明制备的种子胶乳,可以用于丁二烯、苯乙烯以及其他单体的乳液聚合中生产丁苯胶乳。本发明的有益效果在于：由该种子胶乳制备的丁苯胶乳,粒径、玻璃化转变温度可控性强、与涂料配伍性好,具有优异的机械和化学稳定性,可以满足高速涂布作业性的要求。(The present invention relates to emulsion polymerized copolymer latex technology fields, specifically, being a kind of for producing the seed latex of styrene-butadiene latex.The seed latex is formed by following monomer by emulsion polymerization, and the monomer includes: divinylic monomer according to mass percent: 5~20wt%；Styrene monomer: 70~90wt%；Unsaturated carboxylic acid: 2.0~6.5wt%；The glass transition temperature of the seed latex is 45~80 DEG C；Partial size is 30~40nm；Current potential is -15~-25mv.Using seed latex prepared by the present invention, can be used in the emulsion polymerization of butadiene, styrene and other monomers producing styrene-butadiene latex.The beneficial effects of the present invention are: the styrene-butadiene latex prepared by the seed latex, partial size, glass transition temperature controllability are strong, good with Compatibility of Coating Color, have excellent mechanically and chemically stability, can satisfy the requirement of high-speed coating workability.)

1. a kind of for producing the seed latex of styrene-butadiene latex, it is characterised in that: the seed latex is passed through by following monomer Emulsion polymerization forms, and the monomer includes: according to mass percent

Divinylic monomer: 5~20wt%；

Styrene monomer: 70~90wt%；

Unsaturated carboxylic acid: 2.0~6.5wt%.

The glass transition temperature of the seed latex is 45~80 DEG C；Partial size is 30~40nm；Current potential is -15~-25mv.

2. according to claim 1 a kind of for producing the seed latex of styrene-butadiene latex, it is characterised in that: the insatiable hunger And carboxylic acid are as follows: one of acrylic acid, itaconic acid, methacrylic acid, fumaric acid, maleic acid or several mixing.

3. according to claim 1 a kind of for producing the seed latex of styrene-butadiene latex, it is characterised in that: the seed The copolymer gel content of latex is 20~50%.

4. a kind of for producing the seed latex of styrene-butadiene latex described in any one of -3 according to claim 1, feature exists In: the seed latex preparation method the following steps are included:

(1) pH adjusting agent of 0.01~0.03wt%, the emulsifier of 10~16wt%, 40~50wt% deionized water are added anti- It answers in kettle, stirring is warming up to 75 DEG C to 95 DEG C；

(2) it is added at one time the deionized water of 0.06~0.12wt% initiator, 0.5~0.8wt%, then 20~25wt% is added dropwise The divinylic monomer of styrene monomer, 3.5~5.5wt%, 1.0~1.6wt% unsaturated carboxylic acid, 10.5~14wt% emulsifier With 8.0~12.0wt% deionized water, time for adding 60~180 minutes；

(3) after solution in (2) is added dropwise 30~90 minutes, then 0.01~0.04wt% initiator, 0.25~0.50wt% is added dropwise Deionized water 30~90 minutes.

(4) after completion of dropwise addition, 75~95 DEG C keep the temperature 1~4 hour, and heat preservation terminates, and is cooled to 45 DEG C with bottom discharge.

5. according to claim 4 a kind of for producing the seed latex of styrene-butadiene latex, it is characterised in that: the emulsifier It for anion emulsifier, uses: neopelex, lauryl sodium sulfate, alkyl alcohol ether sulfate, sulfonation fourth two Any one in acid esters, alkyl ether sulfosuccinates or combination.

6. according to claim 4 a kind of for producing the seed latex of styrene-butadiene latex, it is characterised in that: the initiator For persulfate, such as any one in ammonium persulfate, potassium peroxydisulfate, sodium peroxydisulfate.

[technical field]

The present invention relates to emulsion polymerized copolymer latex technology fields, specifically, being a kind of for producing styrene-butadiene latex Seed latex.

[background technique]

In recent years, as the raising of people's level of cultural life, publication and printing and commercial printing are with a plurality of types of coatings The demand of paper and high-grade paper art paper increases rapidly, carboxylic styrene butadiene latex as one of most important raw material of Paper Coating, Also increasing to its demand, quality requirement is also higher and higher.The development trend of current styrene-butadiene latex is to multi-functional and high Functionalization direction is developed.The most excellent performance of the latex of multifunction is: film-forming temperature is low, performance is good, has under room temperature higher Stress, so that stiffness, gloss and the print gloss of coating paper and surface strength is reached optimum balance.

Application No. is 201810250374.7 Chinese invention patent applications to disclose a kind of Paper Coating styrene-butadiene latex And its seed latex and preparation method, according to the mass fraction, the raw material composition of seed latex includes lactic acid 5-10 parts, caprolactone 5-10 parts, 10-15 parts of atoleine, 1.0-1.5 parts of aminated lignin, 0.01-0.3 parts of catalyst, 0.2-0.4 parts of electrolyte, 0.05-0.2 parts of pH buffer, 0.5-1.6 parts of anion emulsifier, 40-60 parts of deionized water.Its main feature is that being adopted using emulsifier With anion emulsifier, catalyst is used in sulfamic acid, sodiuim bisulfate, Ferric Chloride Hydrated and ferric sulfate hydrate ammonium extremely Few one kind, and atoleine and lignin is added.

Application No. is 201510679768.0 Chinese invention patent applications to disclose a kind of paper grade (stock) high-performance butadiene-styrene rubber Cream, seed latex A's the preparation method comprises the following steps: polymeric kettle put into after vacuumizing soft water, whole emulsifiers, molecular weight regulator, PH buffer and whole monomers, are warming up to 60-80 DEG C, are added dropwise initiator 3-4 hours, 80 DEG C heat preservation 2-3 hours, conversion ratio reaches After 98% or more, 30 DEG C of bottom discharges are cooled to.Its seed glue B's the preparation method comprises the following steps: polymeric kettle vacuumize after put into soft water, whole Emulsifier, molecular weight regulator, pH buffer and whole monomer, be warming up to 40-60 DEG C, be added dropwise initiator 10-15 hour, turn After rate reaches 98% or more, 30 DEG C of bottom discharges are cooled to.

The above patent all discloses the preparation method and application of the seed latex of paper grade (stock) styrene-butadiene latex, these seed latex The latex particle size of preparation is controllable and wider distribution, and can improve the caking property and intensity of coating paper, assigns the good biology of paper Degradability, resistance to ag(e)ing and ink adaptability, but be disadvantageous in that and be difficult to make resistance to printing stock intensity and ink to be reached by rationality To requirement, and seed latex manufacturing cycle is longer, and technique is more complex.

Based on above-mentioned technology status, the present inventor proposes following technical scheme.

[summary of the invention]

Technical problem to be solved by the present invention lies in overcome the deficiencies in the prior art proposes a kind of for producing butylbenzene The seed latex of latex, the seed latex for the production styrene-butadiene latex that the present invention develops, molecule and particle design are carried out to it, is made It is standby go out carboxylic styrene butadiene latex partial size, glass transition temperature controllability it is strong, good with Compatibility of Coating Color, with excellent machinery with Chemical stability can satisfy the requirement of high-speed coating workability.

In order to solve the above-mentioned technical problem, the invention adopts the following technical scheme: a kind of for producing styrene-butadiene latex Seed latex, the seed latex are formed by following monomer by emulsion polymerization, and the monomer includes: according to mass percent Divinylic monomer: 5~20wt%；Styrene monomer: 70~90wt%；Unsaturated carboxylic acid: 2.0~6.5wt%；The seed glue The glass transition temperature of cream is 45~80 DEG C；Partial size is 30~40nm；Current potential is -15~-25mv.

Furthermore, in above-mentioned technical proposal, the unsaturated carboxylic acid are as follows: acrylic acid, itaconic acid, metering system One of acid, fumaric acid, maleic acid or several mixing, preferably acrylic acid, itaconic acid and methacrylic acid.

Furthermore, in above-mentioned technical proposal, the copolymer gel content of the seed latex is 20~50%.

Furthermore, in above-mentioned technical proposal, the preparation method of seed latex the following steps are included:

(1) pH adjusting agent of 0.01~0.03wt%, the emulsifier of 10~16wt%, 40~50wt% deionized water are added Enter in reaction kettle, stirring is warming up to 75 DEG C to 95 DEG C；

(2) it is added at one time the deionized water of 0.06~0.12wt% initiator, 0.5~0.8wt%, then it is added dropwise 20~ The divinylic monomer of 25wt% styrene monomer, 3.5~5.5wt%, 1.0~1.6wt% unsaturated carboxylic acid, 10.5~14wt% Emulsifier and 8.0~12.0wt% deionized water, time for adding 60~180 minutes；

(3) after in (2) solution be added dropwise 30~90 minutes after, then be added dropwise 0.01~0.04wt% initiator, 0.25~ 0.50wt% deionized water 30~90 minutes.

(4) after completion of dropwise addition, 75~95 DEG C keep the temperature 1~4 hour, and heat preservation terminates, and is cooled to 45 DEG C with bottom discharge.

Furthermore, in the technical solution of above-mentioned preparation method, the emulsifier is anion emulsifier, is used: Neopelex, lauryl sodium sulfate, alkyl alcohol ether sulfate, sulfonation succinate, alkyl ether sulfosuccinate Any one in ester or combination.

Furthermore, in the technical solution of above-mentioned preparation method, the initiator be persulfate, as ammonium persulfate, Any one in potassium peroxydisulfate, sodium peroxydisulfate.

Using seed latex prepared by the present invention, it can be used for the emulsion polymerization of butadiene, styrene and other monomers Middle production styrene-butadiene latex.The beneficial effects of the present invention are: the styrene-butadiene latex prepared by the seed latex, partial size, vitrifying turn Temperature controllability is strong, good with Compatibility of Coating Color, has excellent mechanically and chemically stability, can satisfy high-speed coating operation The requirement of property.

[specific embodiment]

The invention discloses a kind of for producing the seed latex of styrene-butadiene latex, and the seed latex is led to by following monomer It crosses emulsion polymerization to form, the monomer includes: according to mass percent

Divinylic monomer: 5~20wt%；

Styrene monomer: 70~90wt%；

Unsaturated carboxylic acid: 2.0~6.5wt%.

The glass transition temperature of the seed latex is 45~80 DEG C；Partial size is 30~40nm；Current potential be -15~- 25mv。

The unsaturated carboxylic acid are as follows: one of acrylic acid, itaconic acid, methacrylic acid, fumaric acid, maleic acid or Several mixing, preferably acrylic acid, itaconic acid and methacrylic acid.

The copolymer gel content of the seed latex is 20~50%.

In preparation process of the present invention, in emulsion polymerization, the water of specified amount, the unsaturation are first added in the reactor Initiator solution, rest part monomer is added when being warming up to reaction temperature in carboxylic acid, emulsifier, various compounding agent solutions and monomer.Separately Outside, emulsifier and various compounding agent solutions and unsaturated carboxylic acid etc. are continuously added in the course of the polymerization process；When polymerisation conversion is greater than Reaction, final latex solid content 30 ± 1% are terminated when 99%.

Specifically, the preparation method of the seed latex the following steps are included:

(1) pH adjusting agent of 0.01~0.03wt%, the emulsifier of 10~16wt%, 40~50wt% deionized water are added Enter in reaction kettle, stirring is warming up to 75 DEG C to 95 DEG C；

(2) it is added at one time the deionized water of 0.06~0.12wt% initiator, 0.5~0.8wt%, then it is added dropwise 19.8~ The divinylic monomer of 23.5wt% styrene monomer, 2.0~5.1wt%, 0.6~1.5wt% unsaturated carboxylic acid, 10.5~ 14wt% emulsifier and 8.0~12.0wt% deionized water, time for adding 60~180 minutes；

(3) after in (2) solution be added dropwise 30~90 minutes after, then be added dropwise 0.01~0.04wt% initiator, 0.25~ 0.50wt% deionized water 30~90 minutes.

(4) after completion of dropwise addition, 75~95 DEG C keep the temperature 1~4 hour, and heat preservation terminates, and is cooled to 45 DEG C with bottom discharge.

The emulsifier is anion emulsifier, is used: neopelex, lauryl sodium sulfate, alkyl Ether alcohol sulfate, sulfonation succinate, any one or combination in alkyl ether sulfosuccinates.

The initiator is persulfate, such as any one in ammonium persulfate, potassium peroxydisulfate, sodium peroxydisulfate.

The present invention is further detailed with reference to embodiments.

In embodiment, all materials are calculated by percentage to the quality.Emulsion polymerization is in replaced with nitrogen, dress It is carried out in 10 liters of stainless steel autoclaves for having blender, temperature controllable.