CN110698592A - Styrene-butadiene latex for latex foaming and preparation method thereof - Google Patents
Styrene-butadiene latex for latex foaming and preparation method thereof Download PDFInfo
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- CN110698592A CN110698592A CN201911023863.XA CN201911023863A CN110698592A CN 110698592 A CN110698592 A CN 110698592A CN 201911023863 A CN201911023863 A CN 201911023863A CN 110698592 A CN110698592 A CN 110698592A
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F236/00—Copolymers of compounds having one or more unsaturated aliphatic radicals, at least one having two or more carbon-to-carbon double bonds
- C08F236/02—Copolymers of compounds having one or more unsaturated aliphatic radicals, at least one having two or more carbon-to-carbon double bonds the radical having only two carbon-to-carbon double bonds
- C08F236/04—Copolymers of compounds having one or more unsaturated aliphatic radicals, at least one having two or more carbon-to-carbon double bonds the radical having only two carbon-to-carbon double bonds conjugated
- C08F236/10—Copolymers of compounds having one or more unsaturated aliphatic radicals, at least one having two or more carbon-to-carbon double bonds the radical having only two carbon-to-carbon double bonds conjugated with vinyl-aromatic monomers
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F2/00—Processes of polymerisation
- C08F2/12—Polymerisation in non-solvents
- C08F2/16—Aqueous medium
- C08F2/22—Emulsion polymerisation
- C08F2/24—Emulsion polymerisation with the aid of emulsifying agents
- C08F2/26—Emulsion polymerisation with the aid of emulsifying agents anionic
Abstract
The invention discloses styrene-butadiene latex for latex foaming, which relates to the technical field of chemical materials and comprises the following raw materials in parts by weight: 5-10 parts of small seed emulsion, 5-10 parts of large seed emulsion, 65-75 parts of butadiene, 15-25 parts of styrene, 3-5 parts of emulsifier, 0.3-1 part of oxidant, 0.3-1 part of reducing agent, 0.3-1 part of pH regulator, 0.2-0.5 part of molecular weight regulator and 100 parts of deionized water. The invention uses the process of seed emulsion, and the large seed emulsion and the small seed emulsion cooperate with the residual components to form a stable emulsifying formula, so as to obtain the high-solid-content styrene-butadiene latex with the solid content of 68-72 percent. The invention also provides a preparation method, which has low operation difficulty, is easy for industrial popularization and has good application prospect.
Description
Technical Field
The invention relates to the technical field of chemical materials, in particular to styrene-butadiene latex for latex foaming and a preparation method thereof.
Background
Styrene-butadiene latex has been dominating in the synthetic latex industry due to its excellent rubber toughness and low price. It is an aqueous emulsion with 30-50% of solid content, which is mainly obtained by emulsion polymerization of butadiene (B) and styrene (S). The emulsion has the toughness of rubber, does not discharge VOC (volatile organic compounds), is green and environment-friendly, and can be widely applied to various fields such as papermaking, coatings, textiles, buildings, adhesives and the like as a reinforcing agent. The high solid content styrene-butadiene latex is latex with solid content more than 65% and still capable of keeping fluidity, has the advantages of high production efficiency, low transportation cost, quick drying, low energy consumption and the like compared with the conventional latex with the solid content of less than 50%, and can be applied to the aspects of latex sponge (such as latex mattresses, latex pillows and the like), adhesives, road asphalt modification, shoe materials and the like.
The traditional production process of high-solid-content styrene-butadiene latex is generally divided into a one-step method and a two-step method (synthesis and concentration), and although the synthesis methods are different, the key is to synthesize latex particles with large particle size and wide particle size distribution. The conversion rate of the high-solid-content styrene-butadiene latex synthesized in one step is about 95 percent, and the method has the advantages that the high-solid-content styrene-butadiene latex is directly synthesized in one step without concentrating the latex, and has the defects of relatively low conversion rate, high viscosity at the later stage of reaction, higher requirement on stirring, long reaction time and low efficiency. The two-step method for synthesizing the high-solid-content styrene-butadiene latex is a commonly used industrial synthesis method, and the latex with large particle size and wide particle size distribution is prepared by the conventional emulsion polymerization and agglomeration technology and then is evaporated and concentrated to obtain the high solid content. The method has the advantages that the styrene-butadiene latex product can be adjusted by utilizing the process and the formula, but the key requirement on the stability of an emulsification system in the post-treatment process is high, the demulsification and the coagulation are avoided in the concentration and dehydration process, and in addition, the energy loss caused by a large amount of dehydration is required to be controlled.
At present, the solid content of domestic styrene-butadiene latex can only be about 60 percent at most, and in the emulsion polymerization process, the improvement of the solid content can easily cause the instability of the product performance, the particle agglomeration is easy to occur, the particle size distribution is unstable, and the application range is limited to a certain extent. For example, when applied to high-quality foamed latex sponge products, the latex is required to have lower water content to obtain foamed products with uniform cells and excellent physical and mechanical properties; in the road asphalt modification process, the styrene-butadiene latex is required to have higher solid content, and the glass transition temperature of the resin is required to be lower than-50 ℃ so as to meet the requirements of the construction process and obtain good toughening effect, while the water content of the current domestic styrene-butadiene latex is basically more than 40%, and when the current domestic styrene-butadiene latex is contacted with hot asphalt, the water is exploded and boiled and is difficult to control, polymer particles can be agglomerated, so that the dispersion effect is influenced, and the modification requirements of the road asphalt cannot be met. The domestic high solid content styrene-butadiene latex technology is still in the research and development stage, and the large-scale industrial production stage cannot be realized.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: the preparation method of the styrene-butadiene latex in the prior art has the defects of high emulsion viscosity, long stirring reaction time and poor product performance stability in the preparation process.
Aiming at the technical problems, the invention adopts the following technical scheme to solve the problems:
styrene-butadiene latex for latex foaming comprises the following raw materials in parts by weight: 5-10 parts of small seed emulsion, 5-10 parts of large seed emulsion, 65-75 parts of butadiene, 15-25 parts of styrene, 3-5 parts of emulsifier, 0.3-1 part of oxidant, 0.3-1 part of reducing agent, 0.3-1 part of pH regulator, 0.2-0.5 part of molecular weight regulator and 100 parts of deionized water;
the particle size of the latex of the small seed emulsion is 10-40nm, and the particle size of the latex of the large seed emulsion is 80-120 nm.
The invention uses the process of seed emulsion, and the large seed emulsion and the small seed emulsion cooperate with the residual components to form a stable emulsifying formula, so as to obtain the high-solid-content styrene-butadiene latex with the solid content of 68-72 percent.
Preferably, the small seed emulsion comprises the following raw materials in parts by weight: 3-5 parts of styrene, 3-5 parts of emulsifier sodium dodecyl sulfate, 0.1-0.5 part of catalyst potassium persulfate and 100 parts of deionized water.
The preparation method of the small seed emulsion comprises the following steps: dissolving emulsifier sodium dodecyl sulfate in deionized water, adding styrene for emulsification, heating to 80 ℃ under the condition of stirring, adding a catalyst, and reacting for 0.5-2 h.
Further, the large seed emulsion comprises 5-10 parts by weight of styrene, 0.5-2 parts by weight of emulsifier sodium dodecyl sulfate, 0.1-0.5 part by weight of catalyst potassium persulfate and 100 parts by weight of deionized water.
The preparation method of the big seed emulsion comprises the following steps: dissolving emulsifier sodium dodecyl sulfate in deionized water, adding styrene for emulsification, heating to 80 ℃ under the condition of stirring, adding a catalyst, and reacting for 0.5-2 h.
Further, the emulsifier is one or a mixture of potassium abietate, sodium fatty acid, sodium dodecyl sulfate and sodium dodecyl benzene sulfonate.
Further, the oxidant is any one of ammonium persulfate, sodium persulfate, potassium persulfate and diisopropylbenzene hydroperoxide.
Further, the reducing agent is any one of sodium formaldehyde sulfoxylate and ferrous sulfate.
Further, the pH regulator is any one of sodium bicarbonate, diethanolamine and triethanolamine.
Further, the molecular weight regulator is any one of dodecyl mercaptan and diisopropyl xanthogen disulfide.
The invention also discloses a preparation method of the styrene-butadiene latex for latex foaming, which specifically comprises the following steps:
(1) weighing the raw materials of the components in parts by weight;
(2) adding styrene, an emulsifier, a pH regulator and a molecular weight regulator into deionized water, emulsifying uniformly under a high-speed stirring condition, adding into a pre-emulsifying kettle, adding butadiene, and fully stirring and emulsifying in the kettle to obtain a pre-emulsion;
(3) adding the small seed emulsion and the large seed emulsion into a reaction kettle, heating to 30-60 ℃ under the stirring condition, and beginning to dropwise add the pre-emulsion, the oxidant and the reducing agent for 3-6 h;
(4) after the dripping is finished, the temperature is kept at 30-60 ℃ for reaction for 4-8h, and vacuum dehydration is carried out after the reaction is finished, so that 68-72% of high-solid-content styrene-butadiene latex is finally obtained.
In the preparation method, the large seed emulsion and the small seed emulsion are added into a reaction kettle in proportion, then a pre-emulsification method is adopted, the residual monomers are prepared into pre-emulsion, the pre-emulsion is dropwise added into the seed emulsion for agglomeration, and finally the high-solid-content styrene-butadiene latex obtained through reaction has good stability, simple preparation method, low operation difficulty, easy industrial popularization and good application prospect.
The invention has the beneficial effects that:
(1) the invention uses the process of seed emulsion, and the large seed emulsion and the small seed emulsion cooperate with the residual components to form a stable emulsifying formula, so as to obtain the high-solid-content styrene-butadiene latex with the solid content of 68-72 percent.
(2) The preparation method comprises the steps of firstly synthesizing two styrene seed emulsions with the particle sizes of 10-40nm and 80-120nm, then mixing the two styrene seed emulsions according to a certain proportion, adding the two styrene seed emulsions into a reaction kettle, preparing a pre-emulsion from the residual monomers by adopting a pre-emulsification method, dropwise adding the pre-emulsion into the seed emulsion for agglomeration, and reacting at a medium temperature of 40-60 ℃ to obtain the high-solid styrene-butadiene latex. The emulsion has two bimodal particle size distributions, the particle size of small particles is 80-120nm, and the particle size of large particles is 200-400 nm. The small particles are dispersed in the gaps of the large particles, so that the viscosity of the emulsion can be reduced, the good stability of the emulsion is ensured, and the emulsion has wide application prospects in the industrial fields of latex foaming, asphalt toughening and the like.
Drawings
FIG. 1 is a transmission electron micrograph of a styrene-butadiene latex prepared according to example 1;
FIG. 2 is a graph showing a particle size analysis of the styrene-butadiene latex obtained in example 1;
Detailed Description
The invention will be described in further detail below with reference to the drawings and examples of the specification.
Test materials, reagents and the like used in the following examples are commercially available unless otherwise specified.
The specific techniques or conditions not specified in the examples can be performed according to the techniques or conditions described in the literature in the field or according to the product specification.
Example 1
(1) Dissolving 120g of sodium dodecyl sulfate in 4000g of deionized water, adding 120g of styrene for emulsification, heating to 80 ℃ under the stirring condition, adding 20g of potassium persulfate, and reacting for 2 hours to obtain small seed emulsion;
(2) dissolving 20g of sodium dodecyl sulfate in 4000g of deionized water, adding 200g of styrene for emulsification, heating to 80 ℃ under the condition of stirring, adding 4g of potassium persulfate, and reacting for 0.5 to obtain the large seed emulsion.
(3) Adding 600g of styrene, 200g of sodium dodecyl sulfate, 12g of sodium bicarbonate and 8g of dodecanethiol into 4000g of deionized water, emulsifying uniformly under a high-speed stirring condition, adding into a pre-emulsifying kettle, adding 2600g of butadiene, and fully stirring and emulsifying in the kettle to obtain a pre-emulsion;
(3) adding 200g of small seed emulsion and 400g of large seed emulsion into a reaction kettle, heating to 60 ℃ under the stirring condition, and beginning to dropwise add the pre-emulsion, 40g of potassium persulfate and 40 sodium formaldehyde sulfoxylate for 6 hours;
(4) after the dropwise addition, the reaction is carried out for 8 hours at the temperature of 60 ℃, and after the reaction is finished, vacuum dehydration is carried out to finally obtain 68-72% of high-solid-content styrene-butadiene latex.
The styrene-butadiene latex obtained in example 1 was subjected to a performance analysis to obtain a projection electron microscope image of the styrene-butadiene latex shown in FIG. 1 and a particle size analysis image of the styrene-butadiene latex shown in FIG. 2.
Example 2
In this embodiment, 120g of sodium lauryl sulfate was changed to 160g of sodium lauryl sulfate in the preparation of styrene-butadiene latex mini-seed emulsion for latex foaming, and the rest was the same as in example 1.
Example 3
In this embodiment, 120g of sodium lauryl sulfate was changed to 200g of sodium lauryl sulfate in the preparation of styrene-butadiene latex mini-seed emulsion for latex foaming, and the rest was the same as in example 1.
Example 4
In this embodiment, in the preparation process of the styrene-butadiene latex mini-seed emulsion for latex foaming, 120g of sodium dodecyl sulfate was changed to 60g of potassium rosinate and 60g of sodium fatty acid, and the other steps were the same as in example 1.
Example 5
In this embodiment, in the preparation process of the styrene-butadiene latex mini-seed emulsion for latex foaming, 120g of sodium dodecyl sulfate was changed to 80g of potassium rosinate and 80g of sodium fatty acid, and the rest was the same as in example 1.
Example 6
In this embodiment, in the preparation process of the styrene-butadiene latex mini-seed emulsion for latex foaming, 120g of sodium dodecyl sulfate was changed to 100g of potassium rosinate and 100g of sodium fatty acid, and the other steps were the same as in example 1.
Example 7
In the preparation process of the styrene-butadiene latex mini-seed emulsion for latex foaming, 120g of sodium dodecyl sulfate is changed into 120g of sodium dodecyl benzene sulfonate, and the rest is the same as example 1.
Example 8
In the preparation process of the styrene-butadiene latex mini-seed emulsion for latex foaming, 120g of sodium dodecyl sulfate is changed into 160g of sodium dodecyl benzene sulfonate, and the rest is the same as example 1.
Example 9
In the preparation process of the styrene-butadiene latex mini-seed emulsion for latex foaming, 120g of sodium dodecyl sulfate is changed into 200g of sodium dodecyl benzene sulfonate, and the rest is the same as example 1.
Example 10
In this embodiment, in the preparation process of the styrene-butadiene latex mini-seed emulsion for latex foaming, 120g of styrene was changed to 160g of styrene, and the rest was the same as in example 1.
Example 11
In this embodiment, in the preparation process of the styrene-butadiene latex mini-seed emulsion for latex foaming, 120g of styrene was changed to 200g of styrene, and the rest was the same as in example 1.
Example 12
In the present embodiment, 20g of potassium persulfate was changed to 12g of potassium persulfate in the preparation of the styrene-butadiene latex mini-seed emulsion for latex foaming, which was otherwise the same as in example 1.
Example 13
In the present embodiment, in the preparation process of the styrene-butadiene latex mini-seed emulsion for latex foaming, 20g of potassium persulfate was changed to 4g of potassium persulfate, and the rest was the same as in example 1.
Example 14
In the preparation process of the styrene-butadiene latex small seed emulsion for latex foaming, the potassium persulfate is added for reaction for 2 hours, the potassium persulfate is added for reaction for 1 hour, and the rest is the same as that in the example 1.
Example 15
In the preparation process of the styrene-butadiene latex small seed emulsion for latex foaming, the potassium persulfate is added for reaction for 2 hours, and the reaction time is changed into the reaction time for potassium persulfate for reaction for 0.5 hour, and the rest is the same as that in the example 1.
Example 16
In this embodiment, in the preparation process of the styrene-butadiene latex seedlatex for latex foaming, 20g of sodium lauryl sulfate was changed to 40g of sodium lauryl sulfate, and the rest was the same as in example 1.
Example 17
In this embodiment, in the preparation process of the styrene-butadiene latex seedlatex for latex foaming, 20g of sodium dodecyl sulfate was changed to 60g of sodium dodecyl sulfate, and the rest was the same as in example 1.
Example 18
In this embodiment, in the preparation process of the styrene-butadiene latex seedlatex for latex foaming, 20g of sodium lauryl sulfate was changed to 80g of sodium lauryl sulfate, and the rest was the same as in example 1.
Example 19
In this embodiment, in the preparation process of the styrene-butadiene latex seedlatex for latex foaming, 20g of sodium lauryl sulfate was changed to 10g of potassium rosinate and 10g of sodium fatty acid, and the other steps were the same as in example 1.
Example 20
In this embodiment, in the preparation process of the styrene-butadiene latex seedlatex for latex foaming, 20g of sodium lauryl sulfate was changed to 20g of potassium rosinate and 20g of sodium fatty acid, and the other steps were the same as in example 1.
Example 21
In this embodiment, in the preparation process of the styrene-butadiene latex seedlatex for latex foaming, 20g of sodium lauryl sulfate was changed to 30g of potassium rosinate and 30g of sodium fatty acid, and the other steps were the same as in example 1.
Example 22
In this embodiment, in the preparation process of the styrene-butadiene latex seedlatex for latex foaming, 20g of sodium dodecyl sulfate was changed to 40g of potassium rosinate and 40g of sodium fatty acid, and the rest was the same as in example 1.
Example 23
In the present embodiment, in the preparation process of the styrene-butadiene latex macro-seed emulsion for latex foaming, 20g of sodium dodecyl sulfate was changed to 20g of sodium dodecyl benzene sulfonate, and the rest was the same as in example 1.
Example 24
In the present embodiment, in the preparation process of the styrene-butadiene latex seedlatex for latex foaming, 20g of sodium dodecyl sulfate was changed to 40g of sodium dodecyl benzene sulfonate, and the rest was the same as in example 1.
Example 25
In the present embodiment, in the preparation process of the styrene-butadiene latex macro-seed emulsion for latex foaming, 20g of sodium dodecyl sulfate was changed to 60g of sodium dodecyl benzene sulfonate, and the rest was the same as in example 1.
Example 26
In this embodiment, in the preparation process of the styrene-butadiene latex seedlatex for latex foaming, 20g of sodium dodecyl sulfate was changed to 80g of sodium dodecyl benzene sulfonate, and the rest was the same as in example 1.
Example 27
In this embodiment, 200g of styrene was changed to 300g of styrene in the preparation of the styrene-butadiene latex seedlatex for latex foaming, and the rest was the same as in example 1.
Example 28
In this embodiment, 200g of styrene was changed to 400g of styrene in the preparation of the styrene-butadiene latex seedlatex for latex foaming, and the rest was the same as in example 1.
Example 29
In this embodiment, 4g of potassium persulfate was changed to 12g of potassium persulfate in the preparation of the styrene-butadiene latex seedlatex for latex foaming, and the other steps were the same as in example 1.
Example 30
In this embodiment, in the preparation of the styrene-butadiene latex seedlatex for latex foaming, 4g of potassium persulfate was changed to 20g of potassium persulfate, and the rest was the same as in example 1.
Example 31
In the preparation process of the styrene-butadiene latex seedlatex for latex foaming, the potassium persulfate is added for reaction for 0.5h instead of for reaction for 1h, and the rest is the same as that in the example 1.
Example 32
In the preparation process of the styrene-butadiene latex seedlatex for latex foaming, the potassium persulfate is added for reaction for 0.5h instead of for reaction for 2h, and the rest is the same as that in the example 1.
Example 33
In this embodiment, in the preparation of a styrene-butadiene latex pre-emulsion for latex foaming, 600g of styrene was changed to 800g of styrene, and the rest was the same as in example 1.
Example 34
In this embodiment, in the preparation of a styrene-butadiene latex pre-emulsion for latex foaming, 600g of styrene was changed to 1000g of styrene, and the rest was the same as in example 1.
Example 35
In this embodiment, in the preparation of a styrene-butadiene latex pre-emulsion for latex foaming, 200g of sodium lauryl sulfate was changed to 160g of sodium lauryl sulfate, and the rest was the same as in example 1.
Example 36
In this embodiment, 200g of sodium lauryl sulfate was changed to 120g of sodium lauryl sulfate in the preparation of a styrene-butadiene latex pre-emulsion for latex foaming, and the rest was the same as in example 1.
Example 37
In this embodiment, 200g of sodium dodecyl sulfate was changed to 120g of sodium dodecylbenzenesulfonate in the preparation of a styrene-butadiene latex pre-emulsion for latex foaming, and the rest was the same as in example 1.
Example 38
In this embodiment, in the preparation of a styrene-butadiene latex pre-emulsion for latex foaming, 200g of sodium dodecyl sulfate was changed to 160g of sodium dodecyl benzene sulfonate, and the rest was the same as in example 1.
Example 39
In this embodiment, in the preparation of the styrene-butadiene latex pre-emulsion for latex foaming, 200g of sodium dodecylsulfate was changed to 200g of sodium dodecylbenzenesulfonate, and the rest was the same as in example 1.
Example 40
In this embodiment, in the preparation of a styrene-butadiene latex pre-emulsion for latex foaming, 200g of sodium lauryl sulfate was changed to 100g of potassium rosinate and 100g of sodium fatty acid, and the rest was the same as in example 1.
EXAMPLE 41
In this embodiment, in the preparation of a styrene-butadiene latex pre-emulsion for latex foaming, 80g of potassium rosinate and 80g of sodium fatty acid were used instead of 200g of sodium lauryl sulfate, and the rest was the same as in example 1.
Example 42
In this embodiment, in the preparation of a styrene-butadiene latex pre-emulsion for latex foaming, 200g of sodium lauryl sulfate was changed to 60g of potassium rosinate and 60g of sodium fatty acid, and the rest was the same as in example 1.
Example 43
In this embodiment, in the preparation of a styrene-butadiene latex pre-emulsion for latex foaming, 200g of sodium dodecyl sulfate was changed to 100g of potassium rosinate and 100g of sodium dodecylbenzenesulfonate, and the rest was the same as in example 1.
Example 44
In this embodiment, in the preparation of a styrene-butadiene latex pre-emulsion for latex foaming, 200g of sodium dodecyl sulfate was changed to 80g of potassium rosinate and 80g of sodium dodecylbenzenesulfonate, and the rest was the same as in example 1.
Example 45
In this embodiment, in the preparation of a styrene-butadiene latex pre-emulsion for latex foaming, 200g of sodium dodecyl sulfate was changed to 60g of potassium rosinate and 60g of sodium dodecylbenzenesulfonate, and the rest was the same as in example 1.
Example 46
In this embodiment, in the preparation of a styrene-butadiene latex pre-emulsion for latex foaming, 12g of sodium hydrogen carbonate was changed to 26g of sodium hydrogen carbonate, and the other steps were the same as in example 1.
Example 47
In this embodiment, in the preparation of a styrene-butadiene latex pre-emulsion for latex foaming, 12g of sodium hydrogen carbonate was changed to 40g of sodium hydrogen carbonate, and the other steps were the same as in example 1.
Example 48
In this embodiment, 12g of sodium bicarbonate was changed to 12g of diethanolamine in the preparation of a styrene-butadiene latex pre-emulsion for latex foaming, and the other steps were the same as in example 1.
Example 49
In this embodiment, in the preparation of a styrene-butadiene latex pre-emulsion for latex foaming, 12g of sodium bicarbonate was changed to 26g of diethanolamine, and the rest was the same as in example 1.
Example 50
In this embodiment, in the preparation of a styrene-butadiene latex pre-emulsion for latex foaming, 40g of diethanolamine was used instead of 12g of sodium bicarbonate, and the rest was the same as in example 1.
Example 51
In this embodiment, 12g of sodium bicarbonate was changed to 12g of triethanolamine in the preparation of a styrene-butadiene latex pre-emulsion for latex foaming, and the other steps were the same as in example 1.
Example 52
In this embodiment, in the preparation of a styrene-butadiene latex pre-emulsion for latex foaming, 12g of sodium bicarbonate was changed to 26g of triethanolamine, and the rest was the same as in example 1.
Example 53
In this embodiment, 12g of sodium bicarbonate was changed to 40g of triethanolamine in the preparation of a styrene-butadiene latex pre-emulsion for latex foaming, which was otherwise the same as in example 1.
Example 54
In this embodiment, 8g of dodecanethiol was changed to 14g of dodecanethiol in the preparation of a styrene-butadiene latex pre-emulsion for latex foaming, and the rest was the same as in example 1.
Example 55
In this embodiment, in the preparation of a styrene-butadiene latex pre-emulsion for latex foaming, 8g of dodecanethiol was changed to 20g of dodecanethiol, and the rest was the same as in example 1.
Example 56
In the present embodiment, in the preparation process of the styrene-butadiene latex pre-emulsion for latex foaming, 8g of dodecanethiol was changed to 8g of diisopropyl xanthogen disulfide, and the rest was the same as in example 1.
Example 57
In this embodiment, in the preparation of a styrene-butadiene latex pre-emulsion for latex foaming, 8g of dodecanethiol was changed to 14g of diisopropyl xanthogen disulfide, and the rest was the same as in example 1.
Example 58
In this embodiment, in the preparation of a styrene-butadiene latex pre-emulsion for latex foaming, 8g of dodecanethiol was changed to 20g of diisopropyl xanthogen disulfide, and the rest was the same as in example 1.
Example 59
In this embodiment, 2600g of butadiene was changed to 2800g of butadiene in the preparation of a styrene-butadiene latex pre-emulsion for latex foaming, which was otherwise the same as in example 1.
Example 60
In this embodiment, 2600g of butadiene was changed to 3000g of butadiene in the preparation of a styrene-butadiene latex pre-emulsion for latex foaming, which was otherwise the same as in example 1.
Example 61
In this embodiment, in the process of preparing styrene-butadiene latex for latex foaming, 200g of the small seed emulsion and 400g of the large seed emulsion are changed to 300g of the small seed emulsion and 300g of the large seed emulsion, and the rest is the same as example 1.
Example 62
In this embodiment, in the process of preparing styrene-butadiene latex for latex foaming, 200g of the small seed emulsion and 400g of the large seed emulsion are changed to 400g of the small seed emulsion and 200g of the large seed emulsion, and the rest is the same as example 1.
Example 63
In the present embodiment, the reaction temperature of 60 ℃ and the holding temperature of 60 ℃ were changed to 50 ℃ in the preparation of styrene-butadiene latex for latex foaming, and the other steps were the same as in example 1.
Example 64
In the present embodiment, the reaction temperature of 60 ℃ and the holding temperature of 60 ℃ were changed to 40 ℃ in the preparation of styrene-butadiene latex for latex foaming, and the other steps were the same as in example 1.
Example 65
In the present embodiment, the reaction temperature of 60 ℃ and the holding temperature of 60 ℃ were changed to 30 ℃ in the preparation of styrene-butadiene latex for latex foaming, and the other steps were the same as in example 1.
Example 66
In the present embodiment, in the production of styrene-butadiene latex for latex foaming, 40g of potassium persulfate and 40g of sodium formaldehyde sulfoxylate were changed to 12g of potassium persulfate and 12g of sodium formaldehyde sulfoxylate, and the other steps were the same as in example 1.
Example 67
In the present embodiment, in the production of styrene-butadiene latex for latex foaming, 40g of potassium persulfate and 40g of sodium formaldehyde sulfoxylate were changed to 25g of potassium persulfate and 25g of sodium formaldehyde sulfoxylate, and the other steps were the same as in example 1
Example 68
In the process of preparing styrene-butadiene latex for latex foaming, the embodiment was carried out by changing 40g of potassium persulfate and 40g of sodium formaldehyde sulfoxylate into 40g of ammonium persulfate and 40g of sodium formaldehyde sulfoxylate, and the rest was the same as in example 1
Example 69
In this embodiment, in the production of styrene-butadiene latex for latex foaming, 40g of potassium persulfate and 40g of rongalite were changed to 12g of ammonium persulfate and 12g of rongalite, and the other steps were the same as in example 1.
Example 70
In the present embodiment, in the production of styrene-butadiene latex for latex foaming, 40g of potassium persulfate and 40g of rongalite were changed to 25g of ammonium persulfate and 25g of rongalite, and the rest was the same as in example 1
Example 71
In the present embodiment, in the production of styrene-butadiene latex for latex foaming, 40g of potassium persulfate and 40g of sodium formaldehyde sulfoxylate were changed to 40g of potassium persulfate and 40g of sodium formaldehyde sulfoxylate, and the other steps were the same as in example 1
Example 72
In the present embodiment, in the production of styrene-butadiene latex for latex foaming, 40g of potassium persulfate and 40g of sodium persulfate were replaced with 12g of sodium persulfate and 12g of sodium persulfate, and the other steps were the same as in example 1.
Example 73
In the present embodiment, in the production of styrene-butadiene latex for latex foaming, 40g of potassium persulfate and 40g of sodium persulfate were replaced with 25g of sodium persulfate and 25g of sodium persulfate, and the rest was the same as in example 1
Example 74
In the process of preparing styrene-butadiene latex for latex foaming, the process of the present embodiment was carried out by changing 40g of potassium persulfate and 40g of sodium formaldehyde sulfoxylate to 12g of diisopropylbenzene hydroperoxide and 12g of ferrous sulfate, and the rest was the same as in example 1
Example 75
In the process of preparing styrene-butadiene latex for latex foaming, the process of the present embodiment was carried out in the same manner as in example 1 except that the potassium persulfate (40 g) and the sodium formaldehyde sulfoxylate (40 g) were changed to diisopropylbenzene hydroperoxide (25 g) and ferrous sulfate (25 g)
Example 76
In the process of preparing styrene-butadiene latex for latex foaming, 40g of potassium persulfate and 40g of sodium formaldehyde sulfoxylate were changed to 40g of diisopropylbenzene hydroperoxide and 40g of ferrous sulfate, and the rest was the same as in example 1
Example 77
In the preparation process of the styrene-butadiene latex for latex foaming, the dropping time 6h is changed to 4h, and the rest is the same as that of the example 1
Example 78
In the preparation process of the styrene-butadiene latex for latex foaming, the dropping time of 6h is changed into 3h, and the rest is the same as that of the example 1
Example 79
In the preparation process of the styrene-butadiene latex for latex foaming, the heat preservation reaction is changed from 8 hours to 6 hours, and the rest is the same as that in the example 1
Example 80
In the preparation process of the styrene-butadiene latex for latex foaming, the heat preservation reaction is changed from 8 hours to 4 hours, which is the same as that in the example 1
The results of the performance tests performed on the samples prepared in examples 1 to 80 are shown in Table 1 below:
table 1 comparison of the properties of the examples
By comprehensively comparing the data in the table, it can be seen that when the particle size of the latex containing the small seed emulsion in the raw material formula is 10-40nm and the particle size of the latex containing the large seed emulsion is 80-120nm, the prepared high-solid styrene-butadiene rubber emulsion contains double-particle-size peaks, and the styrene-butadiene rubber latex has extremely high curing amount. As can be seen from the data in Table 1 in combination with the raw material formulas in the examples, the particle sizes of the small seed emulsion and the large seed emulsion are critically related to the selection of the raw materials and the component ratios of the raw materials. Meanwhile, the finally prepared high-curing styrene-butadiene rubber emulsion is also in vital association with the dosage of each raw material and the optimized selection of the raw material components. As can be seen from table 1 above, the high-solid content styrene-butadiene latex prepared by the formulation of the claimed components does not increase the solid content of the styrene-butadiene latex due to the action of a single component, but the high-solid content styrene-butadiene latex of the present invention is finally prepared due to the synergistic effect of the components in the formulation.
The above is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above examples, and various process schemes having no substantial difference from the concept of the present invention are within the protection scope of the present invention.
Claims (10)
1. The styrene-butadiene latex for latex foaming is characterized by comprising the following raw materials in parts by weight: 5-10 parts of small seed emulsion, 5-10 parts of large seed emulsion, 65-75 parts of butadiene, 15-25 parts of styrene, 3-5 parts of emulsifier, 0.3-1 part of oxidant, 0.3-1 part of reducing agent, 0.3-1 part of pH regulator, 0.2-0.5 part of molecular weight regulator and 100 parts of deionized water;
the particle size of the latex of the small seed emulsion is 10-40nm, and the particle size of the latex of the large seed emulsion is 80-120 nm.
2. The styrene-butadiene latex for latex foaming according to claim 1, wherein the small seed emulsion comprises the following raw materials in parts by weight: 3-5 parts of styrene, 3-5 parts of emulsifier sodium dodecyl sulfate, 0.1-0.5 part of catalyst potassium persulfate and 100 parts of deionized water.
3. The styrene-butadiene latex for latex foaming according to claim 2, wherein the preparation method of the small seed emulsion comprises: dissolving emulsifier sodium dodecyl sulfate in deionized water, adding styrene for emulsification, heating to 80 ℃ under the condition of stirring, adding a catalyst, and reacting for 0.5-2 h.
4. The styrene-butadiene latex for latex foaming according to claim 1, wherein the macro-seed emulsion comprises 5 to 10 parts by weight of styrene, 0.5 to 2 parts by weight of sodium lauryl sulfate as an emulsifier, 0.1 to 0.5 part by weight of potassium persulfate as a catalyst, and 100 parts by weight of deionized water.
5. The styrene-butadiene latex for latex foaming according to claim 4, wherein the preparation method of the large seed emulsion comprises the following steps: dissolving emulsifier sodium dodecyl sulfate in deionized water, adding styrene for emulsification, heating to 80 ℃ under the condition of stirring, adding a catalyst, and reacting for 0.5-2 h.
6. The styrene-butadiene latex for latex foaming according to claim 1, wherein the oxidizing agent is any one of ammonium persulfate, sodium persulfate, potassium persulfate, and diisopropylbenzene hydroperoxide.
7. The styrene-butadiene latex for latex foaming according to claim 1, wherein the reducing agent is any one of sodium formaldehyde sulfoxylate and ferrous sulfate.
8. The styrene-butadiene latex for latex foaming according to claim 1, wherein the pH adjuster is any one of sodium bicarbonate, diethanolamine, and triethanolamine.
9. The styrene-butadiene latex for latex foaming according to claim 1, wherein the molecular weight modifier is any one of dodecanethiol and diisopropyl xanthogen disulfide.
10. A method for preparing the styrene-butadiene latex for latex foaming according to any one of claims 1 to 9, comprising the steps of:
(1) weighing the raw materials of the components in parts by weight;
(2) adding styrene, an emulsifier, a pH regulator and a molecular weight regulator into deionized water, stirring and emulsifying uniformly, then adding into a pre-emulsifying kettle, adding butadiene, and fully stirring and emulsifying in the kettle to obtain a pre-emulsion;
(3) adding the small seed emulsion and the large seed emulsion into a reaction kettle, heating to 30-60 ℃ under the condition of stirring, and beginning to dropwise add the pre-emulsion, the oxidant and the reducing agent for 3-6 h;
(4) after the dripping is finished, the temperature is kept at 30-60 ℃ for reaction for 4-8h, and vacuum dehydration is carried out after the reaction is finished, so that 68-72% of high-solid-content styrene-butadiene latex is finally obtained.
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| CN106699969A (en) * | 2016-11-23 | 2017-05-24 | 厦门大学 | Preparation method of styrene-butadiene latex with controlled particle size |
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| CN106699969A (en) * | 2016-11-23 | 2017-05-24 | 厦门大学 | Preparation method of styrene-butadiene latex with controlled particle size |
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