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Seed latex and preparation method and application thereof

A seed latex and latex technology, applied in the field of emulsion polymerization copolymer latex, can solve the problems of complex process, difficult water resistance, printing strength and ink acceptance requirements, long preparation period of seed latex, etc., and achieves good compatibility and glass transition. Effects of strong temperature controllability, excellent mechanical and chemical stability

Pending Publication Date: 2019-12-03
NANTONG TENGLONG CHEM TECH CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The above patents all disclose the preparation method and application of the seed latex of styrene-butadiene latex for papermaking. The particle size of the latex prepared by these seed latex is controllable and the distribution is wide, and it can improve the cohesiveness and strength of the coated paper, and endow the paper with good quality. Biodegradability, aging resistance and ink adaptability, but the disadvantage is that it is difficult to meet the requirements of water resistance printing strength and ink acceptance, and the preparation cycle of seed latex is longer and the process is more complicated

Method used

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  • Seed latex and preparation method and application thereof

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Effect test

preparation example Construction

[0028] Specifically, the preparation method of this seed latex comprises the following steps:

[0029] (1) Add 0.01-0.03wt% pH regulator, 10-16wt% emulsifier, 40-50wt% deionized water into the reaction kettle, stir and heat up to 75°C-95°C;

[0030] (2) Add 0.06~0.12wt% initiator, 0.5~0.8wt% deionized water at one time, then add dropwise 15.5~18.5wt% styrene monomer, 8.5~11wt% butadiene monomer, 0.6~0.8wt% 1.5wt% unsaturated carboxylic acid, 10.5-14wt% emulsifier and 8.0-12.0wt% deionized water, the dropping time is 60-180 minutes;

[0031] (3) After the solution in step (2) is added dropwise for 30-90 minutes, then add 0.01-0.04wt% initiator and 0.25-0.50wt% deionized water dropwise for 30-90 minutes.

[0032] (4) After the dropwise addition, keep the temperature at 75 to 95°C for 1 to 4 hours. After the heat preservation is over, cool down to below 45°C and discharge.

[0033] The emulsifier is an anionic emulsifier, which adopts: sodium dodecylbenzene sulfonate, sodium la...

Embodiment 1

[0038] In a 10-liter stainless steel autoclave, sequentially add 0.026wt% of pH regulator, 13.3% of emulsifier, and 44.4wt% of deionized water, accounting for the total weight of the reaction components, and stir to raise the temperature to 85°C; Agent 0.10wt%, deionized water 0.71wt%, then continuously dropwise add styrene monomer 17.0wt%, butadiene monomer 10.0wt%, unsaturated carboxylic acid 1.04wt%, emulsifier 1.21wt% and deionized water 10.1wt%, and the dropping time is 120 minutes; after dropping for 60 minutes, add 0.02wt% of initiator and 0.40wt% of deionized water for 60 minutes; Discharge below 45°C.

Embodiment 2～10

[0040] Embodiment 2~10 reaction process is with embodiment 1, and its each composition and reaction parameter change are shown in Table 1;

[0041] The properties of the obtained butadiene-styrene copolymer latex are shown in Table 2.

[0042] Each composition and reaction parameter change of table 1

[0043]

[0044] The properties of the seed gum product that table 2 embodiment 1~11 and comparative examples obtain

[0045] Example number Glass transition temperature / ℃ Particle size / nm zate potential / -mV Gel content / % 1 12.9 35.0 18.9 65.2 2 4.2 41.2 19.2 68.4 3 22.3 29.4 18.4 67.1 4 21.1 30.1 17.6 70.2 5 19.2 33.2 16.8 66.8 6 16.7 32.4 18.0 71.0 7 14.2 35.6 19.7 74.5 8 11.1 37.1 18.3 63.2 9 9.0 36.9 18.8 62.1 10 6.7 38.6 17.5 65.5

[0046]After testing, when the seed latex prepared by the present invention is used to prepare styrene-butadiene latex, it has strong controll...

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Abstract

The invention discloses a seed latex and a preparation method and application thereof. The seed latex is formed by emulsion polymerization of the following monomers, the monomers comprise in percent by mass: 30-40 wt% of a butadiene monomer, 54-68 wt% of a styrene monomer, and 2-6 wt% of an unsaturated carboxylic acid, the seed latex has a glass transition temperature of 0 DEG C to 25 DEG C, a particle size is 30 nm to 40 nm, and an electric potential is -15 to -25 mV. The prepared seed latex can be used in emulsion polymerization of butadiene, styrene and other monomers to produce styrene-butadiene latexes. The beneficial effects are as follows: the styrene-butadiene latexes prepared by the seed latex have strong controllability of a particle size and a glass transition temperature, and good compatibility with coatings, have excellent mechanical and chemical stability, and can satisfy requirements of high-speed coating operations.

Description

【Technical field】 [0001] The invention relates to the technical field of emulsion polymerization copolymer latex, in particular to a seed latex and its preparation method and application. 【Background technique】 [0002] In recent years, with the improvement of people's cultural living standards, the demand for various types of coated paper and high-grade paper coated paper for publishing and commercial printing has increased rapidly. Carboxylated styrene-butadiene latex is one of the most important raw materials for paper coating First, the demand for it is also increasing, and the quality requirements are also getting higher and higher. The current development trend of styrene-butadiene latex is to develop in the direction of multi-functional and high-functionality. The most excellent properties of high-functionalized latex are: low film-forming temperature, good performance, high stress at room temperature, and the best balance of stiffness, gloss, printing gloss and surf...

Claims

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Application Information

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IPC IPC(8): C08F212/08C08F236/10C08F220/06C08F222/02
CPCC08F212/08C08F236/10C08F220/06
Inventor 张连腾米普科衣振东杨涛汤银银张志高陈翠张健姚丽君李福荣
Owner NANTONG TENGLONG CHEM TECH CO LTD