阅读说明：本技术 通用型醋、叔、丙共聚乳液界面剂及其制备方法 (Universal type vinegar, tertiary and propyl copolymer emulsion interface agent and preparation method thereof ) 是由 陈昌主 李元璐 邱元斌 张海峰 林海峰 于 2020-07-28 设计创作，主要内容包括：本发明涉及一种通用型醋、叔、丙共聚乳液界面剂及其制备方法,主要由以下组分按照以下重量份数比制备而成：质量百分比浓度为10-15％的聚乙烯醇：10-20份；醋、叔、丙共聚乳液：20-30份；水：55-65份。该发明克服了现有聚醋酸乙烯酯乳液界面剂渗透性不够,浸润墙体基层材料表面能力差,界面剂与水泥配伍性差、与墙面附着力小、灰浆或腻子与墙体表面的粘接强度不足等的缺点,通过采用加入叔碳酸乙烯酯、丙烯酸丁酯、丙烯酸羟丙酯与醋酸乙烯酯共聚的方式,制备出醋、叔、丙共聚乳液,再利用该改性乳液制备出通用型醋、叔、丙共聚乳液界面剂,该通用型醋、叔、丙共聚乳液界面剂具有拉伸粘结强度、耐水性、施工后的抗冻性、热贮稳定性、环保性等性能综合效果优异。(The invention relates to a general type vinegar, tertiary and propyl copolymer emulsion interface agent and a preparation method thereof, which is mainly prepared from the following components in parts by weight: 10-15% of polyvinyl alcohol by mass percent: 10-20 parts; vinyl acetate, tertiary and acrylic copolymer emulsion: 20-30 parts of a solvent; water: 55-65 parts. The invention overcomes the defects of insufficient permeability, poor surface infiltration capability of wall base materials, poor compatibility of the interface agent and cement, small adhesion force with wall surfaces, insufficient bonding strength between mortar or putty and the wall surfaces and the like of the existing polyvinyl acetate emulsion interface agent, prepares the copolymer emulsion of vinegar, tert-butyl acrylate and propyl acrylate by adopting a mode of adding vinyl versatate, butyl acrylate, hydroxypropyl acrylate and vinyl acetate for copolymerization, and then prepares the general copolymer emulsion interface agent of vinegar, tert-propyl and propyl by utilizing the modified emulsion.)

1. A general type vinegar, tertiary and acrylic copolymer emulsion interface agent is characterized in that: the adhesive is mainly prepared from the following components in parts by weight:

10-15% of polyvinyl alcohol by mass percent: 10-20 parts of

Vinyl acetate, tertiary and acrylic copolymer emulsion: 20-30 parts of

Water: 55-65 parts;

the vinegar, tertiary and acrylic copolymer emulsion is mainly prepared from the following components in parts by weight:

water: 49-59 parts of

Polyvinyl alcohol: 2-3 parts of

pH regulator: 1.5-2.0 parts

Mixing an emulsifier: 1.0 to 1.5 portions

Defoaming agent: 0.1 to 0.2 portion

2.5 to 3.5 portions of potassium persulfate solution with the mass percentage concentration of 3 to 4 percent

Mixing monomers: 35-45 parts of

Diethylene glycol dibenzoate or dipropylene glycol dibenzoate: 1.0 to 2.0 portions

Preservative: 0.2-0.3 part;

the mixed emulsifier is mainly prepared from the following components in parts by weight:

alkyl benzene sulfonate: 50-60 parts

Nonionic alkyl polyoxyethylene ether: 40-50 parts;

the mixed monomer is mainly prepared from the following components in parts by weight:

vinyl acetate: 55 to 60 portions of

Vinyl versatate: 18-22 parts of

15-25 parts of butyl acrylate

1-4 parts of hydroxypropyl acrylate.

2. The universal type vinegar, tertiary-propyl copolymer emulsion interface agent as claimed in claim 1, wherein: the pH regulator is sodium bicarbonate solution with the mass percentage concentration of 3.5-4.5%.

3. The universal type vinegar, tertiary-propyl copolymer emulsion interface agent as claimed in claim 1, wherein: the defoaming agent is mineral oil defoaming agent.

4. The universal type vinegar, tertiary-propyl copolymer emulsion interface agent as claimed in claim 1, wherein: the preservative is isothiazoleA quinolinone.

5. The method for preparing the universal type vinegar, tertiary and propyl copolymer emulsion interface agent according to any one of claims 1 to 4, wherein: which comprises the following steps in sequence:

(1) preparing a vinegar, tertiary and acrylic copolymer emulsion:

firstly, adding polyvinyl alcohol into the water with the amount of water while stirring, wherein the stirring speed is 160-220rpm/min, then adding a defoaming agent, gradually heating to 88-92 ℃, preserving the temperature for 45-60min, then cooling to 78-83 ℃, and then adding a pH regulator, alkylbenzene sulfonate and nonionic alkyl polyoxyethylene ether into the water to be uniformly mixed;

placing the mixture prepared in the step I for 10-15min at constant temperature, adding 3-4 mass percent potassium persulfate solution accounting for 35-40% of the total amount, mixing uniformly, introducing vinyl acetate, vinyl versatate, butyl acrylate and hydroxypropyl acrylate into a container respectively, mixing, and then beginning to drop and mix uniformly, wherein the dropping time is controlled to be 4.5-5h, and in the dropping process, adding 3-4 mass percent potassium persulfate solution accounting for 8-10% of the total amount every 0.8-1 h;

thirdly, after the dropwise adding is finished, placing for 15-20min, then adding potassium persulfate solution with the mass percentage concentration of 3-4% accounting for 8-10% of the total amount, uniformly mixing, heating to 88-90 ℃, adding the remaining potassium persulfate solution with the mass percentage concentration of 3-4%, and preserving heat for 60-75 min;

fourthly, cooling to 58-62 ℃, adding diethylene glycol dibenzoate or dipropylene glycol dibenzoate, cooling to 45-50 ℃, adding a preservative, and stirring for 15-20min to obtain the copolymer emulsion of vinegar, tertiary alcohol and propylene;

(2) and (2) mixing the vinegar, tertiary and acrylic copolymer emulsion prepared in the step (1) with the polyvinyl alcohol and the water with the mass percentage concentration of 10-15% in proportion, and uniformly dispersing to obtain the general-purpose vinegar, tertiary and acrylic copolymer emulsion interface agent.

6. The method for preparing the universal type vinegar, tertiary-propyl copolymer emulsion interface agent according to claim 5, wherein the method comprises the following steps: and (3) mixing the vinegar, tertiary emulsion and acrylic copolymer emulsion with 10-15% of polyvinyl alcohol and water in percentage by mass, and then carrying out a color mixing process.

Technical Field

The invention relates to a general type vinegar, tertiary and acrylic copolymer emulsion interface agent and a preparation method thereof, which are applied to the field of building decoration coatings.

Background

The interfacial agent is a surface treatment agent for improving or completely changing the surface properties of a material by physically and chemically treating the surface of an object. The interface agent has applications in different fields, and has different technical means and purposes for surface treatment of objects. The interface agent has excellent permeability, can fully infiltrate the surface of a wall base material, enables the base to be compact through crosslinking, improves the interface adhesive force, improves the adhesive strength of mortar or putty and the surface of a wall, and prevents hollowing.

The common polymer emulsion interface agent mainly comprises butylbenzene emulsion, styrene-acrylic emulsion, polyvinyl acetate emulsion and the like. The interface agents prepared from various emulsions have advantages and disadvantages, wherein the polyvinyl acetate emulsion has the advantages of simple production process, convenient use, low price, high initial bonding strength and the like, and has wide application market. The traditional polyvinyl acetate emulsion is prepared by polymerizing vinyl acetate through emulsion, has obvious defects, and the prepared interface agent has the problems of insufficient permeability, poor surface capability of infiltrating a wall base material, poor compatibility of the interface agent and cement, small adhesion force with a wall surface, insufficient bonding strength between mortar or putty and the wall surface and the like.

Therefore, it is an urgent need to provide a general-purpose vinegar, tertiary-butyl and tertiary-propyl copolymer emulsion interface agent with the advantages of excellent comprehensive effects of tensile bonding strength, water resistance, frost resistance after construction, heat storage stability, environmental protection and the like, and a preparation method thereof.

Disclosure of Invention

In order to overcome the defects of insufficient permeability, poor surface infiltration capability of a wall base material, poor compatibility of an interface agent and cement, small adhesion force with a wall surface, insufficient bonding strength between mortar or putty and the surface of a wall body and the like of the conventional polyvinyl acetate emulsion interface agent, the invention provides a general-purpose vinyl, tertiary and acrylic copolymer emulsion interface agent and a preparation method thereof.

The technical scheme of the invention is as follows:

a general type vinegar, tertiary and acrylic copolymer emulsion interface agent is mainly prepared from the following components in parts by weight:

10-15% of polyvinyl alcohol by mass percent: 10-20 parts of

Vinyl acetate, tertiary and acrylic copolymer emulsion: 20-30 parts of

Water: 55-65 parts;

the vinegar, tertiary and acrylic copolymer emulsion is mainly prepared from the following components in parts by weight:

water: 49-59 parts of

Polyvinyl alcohol: 2-3 parts of

pH regulator: 1.5-2.0 parts

Mixing an emulsifier: 1.0 to 1.5 portions

Defoaming agent: 0.1 to 0.2 portion

2.5 to 3.5 portions of potassium persulfate solution with the mass percentage concentration of 3 to 4 percent

Mixing monomers: 35-45 parts of

Diethylene glycol dibenzoate or dipropylene glycol dibenzoate: 1.0 to 2.0 portions

Preservative: 0.2-0.3 part;

the mixed emulsifier is mainly prepared from the following components in parts by weight:

alkyl benzene sulfonate: 50-60 parts

Nonionic alkyl polyoxyethylene ether: 40-50 parts;

the mixed monomer is mainly prepared from the following components in parts by weight:

vinyl acetate: 55 to 60 portions of

Vinyl versatate: 18-22 parts of

15-25 parts of butyl acrylate

1-4 parts of hydroxypropyl acrylate.

The general-purpose vinyl acetate, tertiary acrylate and propyl acrylate copolymer emulsion interface agent is prepared by introducing three functional monomers of tertiary ethylene carbonate, butyl acrylate and hydroxypropyl acrylate into a vinyl acetate system, matching with a preferred dosage ratio, forming a quaternary homogeneous copolymer system by the three and the vinyl acetate, firstly preparing a vinyl acetate, tertiary acrylate and propyl acrylate copolymer emulsion (namely modified polyvinyl acetate emulsion), and then preparing the emulsion, a polyvinyl alcohol aqueous solution and water. The vinyl versatate has super hydrophobicity due to larger steric hindrance, and the steric hindrance effect of an alkyl group on an alpha-carbon atom protects an ester group of vinyl acetate on a polymer chain, inhibits the easy hydrolysis of the vinyl acetate, improves the alkali resistance of the polymer, and improves the stability of emulsion, thereby improving the water resistance of the product. The hydroxypropyl acrylate has high-polarity active hydroxyl functional groups, so that the product is favorable for infiltration and dispersion with cement in the process of dispersing mixed cement, and can generate crosslinking reaction with aluminum salt in the cement in the process of drying and curing to form a reticular crosslinking structure system, and the cohesive strength, adhesive force, breaking strength, water resistance and weather resistance of the product can be improved. And the butyl acrylate side chain can provide better flexibility, and can obviously improve the brittleness and cracking phenomena of the cement cured in a low-temperature environment. When the interface agent is prepared, the polyvinyl alcohol solution is added and matched with the optimal dosage proportion, the compatibility of the interface agent mixed with cement when the interface agent is used for coarse hair can be further improved, the pot life of mixed slurry is prolonged, and simultaneously, when the interface agent is used in the field of wall surface reinforcing and penetration, putty is scraped after the interface agent is coated and dried, and water-soluble polyvinyl alcohol can migrate to a putty layer under the soaking of water in the putty, so that the bonding force between interfaces is enhanced. If ammonium persulfate is used as an initiator, irritant ammonia gas can be generated after the interfacial agent is mixed with cement in the subsequent use process, but potassium persulfate solution with the mass percentage concentration of 3-4% is used as the initiator, so that the problem can be effectively avoided. The mixed emulsifier prepared from the alkylbenzene sulfonate and the nonionic alkyl polyoxyethylene ether is adopted, so that the stability of the interfacial agent when the interfacial agent is mixed with cement can be further enhanced. Meanwhile, the environment-friendly plasticizer diethylene glycol dibenzoate/dipropylene glycol dibenzoate and nonionic polyether polyol are adopted to replace the existing common o-benzene plasticizer and nonyl phenol surfactant auxiliary, so that the product is free of formaldehyde, benzene series, heavy metal, o-benzene, nonyl phenol and other harmful substances, and the problem of environment-friendly performance of the product is solved. The universal type vinegar, tertiary and acrylic copolymer emulsion interface agent prepared by the scheme has the following advantages: (1) can be mixed with cement for wool making, and has excellent wool making effect; (2) the water resistance is good, and the batch putty after painting and drying the color matching product does not have bleeding or fading; (3) the product has low viscosity, and can effectively control the cracking phenomenon caused by large shrinkage stress generated by a putty layer in the drying process because the interface agent coating is too thick due to less water addition during construction; (4) the environment-friendly performance is improved because the auxiliary agent containing aldehydes and nonyl phenol substances is not added, and the product has strong universality; (5) the product has the advantages that the comprehensive performance of the product reaches the optimal balance of permeation, sealing, water resistance and bonding, the wall surface base material can be effectively permeated and sealed and enhanced, the product has good compatibility with cement, rough hair can be attached to a smooth base surface, the surface roughness is increased, the product is mainly applied to rough hair sealing and adhesion improvement of a smooth concrete base material, and the product can also be used for reinforcing and reinforcing a concrete top layer after brick walls, a cement mortar plastering layer and putty shoveling, and secondary renovation putty layer permeation and sealing reinforcement with lower strength and the like.

The pH regulator is sodium bicarbonate solution with the mass percentage concentration of 3.5-4.5%.

Preferred pH adjusters are readily available and low cost.

The defoaming agent is mineral oil defoaming agent.

The preferable antifoaming agent is common and has good defoaming effect.

The preservative is isothiazoleA quinolinone.

Preferred preservatives are readily available and low cost.

The preparation method of the general-purpose type vinegar, tertiary and acrylic copolymer emulsion interface agent comprises the following steps of:

(1) preparing a vinegar, tertiary and acrylic copolymer emulsion:

firstly, adding polyvinyl alcohol into the water with the amount of water while stirring, wherein the stirring speed is 160-220rpm/min, then adding a defoaming agent, gradually heating to 88-92 ℃, preserving the temperature for 45-60min, then cooling to 78-83 ℃, and then adding a pH regulator, alkylbenzene sulfonate and nonionic alkyl polyoxyethylene ether into the water to be uniformly mixed;

placing the mixture prepared in the step I for 10-15min at constant temperature, adding 3-4 mass percent potassium persulfate solution accounting for 35-40% of the total amount, mixing uniformly, introducing vinyl acetate, vinyl versatate, butyl acrylate and hydroxypropyl acrylate into a container respectively, mixing, and then beginning to drop and mix uniformly, wherein the dropping time is controlled to be 4.5-5h, and in the dropping process, adding 3-4 mass percent potassium persulfate solution accounting for 8-10% of the total amount every 0.8-1 h;

thirdly, after the dropwise adding is finished, placing for 15-20min, then adding potassium persulfate solution with the mass percentage concentration of 3-4% accounting for 8-10% of the total amount, uniformly mixing, heating to 88-90 ℃, adding the remaining potassium persulfate solution with the mass percentage concentration of 3-4%, and preserving heat for 60-75 min;

fourthly, cooling to 58-62 ℃, adding diethylene glycol dibenzoate or dipropylene glycol dibenzoate, cooling to 45-50 ℃, adding a preservative, and stirring for 15-20min to obtain the copolymer emulsion of vinegar, tertiary alcohol and propylene;

(2) and (2) mixing the vinegar, tertiary and acrylic copolymer emulsion prepared in the step (1) with the polyvinyl alcohol and the water with the mass percentage concentration of 10-15% in proportion, and uniformly dispersing to obtain the general-purpose vinegar, tertiary and acrylic copolymer emulsion interface agent.

The preferable working procedures and technological parameters of the preparation method of the general-purpose vinegar, tertiary-propyl copolymer emulsion interface agent ensure that the prepared interface agent has excellent comprehensive effects of tensile bonding strength, water resistance, freezing resistance after construction, heat storage stability and other properties.

And (3) mixing the vinegar, tertiary emulsion and acrylic copolymer emulsion with 10-15% of polyvinyl alcohol and water in percentage by mass, and then carrying out a color mixing process.

Whether to carry out the color matching process can be selected according to specific needs.

Compared with the prior art, the method has the following advantages:

1) the general-purpose type vinyl acetate, tertiary acrylate and propyl acrylate copolymer emulsion interface agent is prepared by introducing three functional monomers, namely tertiary vinyl carbonate, butyl acrylate and hydroxypropyl acrylate, into a vinyl acetate system, matching with a preferable dosage proportion, forming a quaternary homogeneous copolymer system by the three functional monomers and the vinyl acetate, and preparing the prepared vinyl acetate, tertiary acrylate and propyl acrylate copolymer emulsion, a polyvinyl alcohol aqueous solution and water, and has the advantages of excellent comprehensive effects of tensile bonding strength, water resistance, freezing resistance after construction, heat storage stability and good environmental protection;

2) the preferable pH regulator is easy to obtain and has low cost, the preferable antifoaming agent is common and has good defoaming effect, and the preferable preservative is easy to obtain and has low cost;

3) the preferable working procedures and technological parameters of the preparation method of the general-purpose vinegar, tertiary-propyl copolymer emulsion interface agent enable the comprehensive effects of the prepared interface agent such as tensile bonding strength, water resistance, freezing resistance after construction, heat storage stability and the like to be more excellent.

Detailed Description

The technical solution of the present invention will be described in detail with reference to examples.