阅读说明：本技术 一种联合有机锡稳定剂及其制备方法 (Combined organic tin stabilizer and preparation method thereof ) 是由 戴百雄 曹海兵 朱科 宫庭 刘勇 徐善武 温志鹏 石盼盼 罗斌 于 2020-06-30 设计创作，主要内容包括：本发明公开了一种联合有机锡稳定剂及其制备方法。本发明的一种联合有机锡稳定剂,包括如下质量比的原料：硫醇甲基锡：逆酯锡：巯基酸辛酯：卡必醇为63～80：11～17：11～20：6～12。本发明的制备方法,包括如下步骤：S1：先加入上述质量比的硫醇甲基锡与巯基酸辛酯搅拌混合；S2：向S1得到的混合物中加入上述质量比的卡必醇与逆酯锡,继续搅拌。本发明因为逆酯锡与硫醇甲基锡中的结构为逆向结构,受锡元素电负性、羰基位置、有机链长的影响,澄清的二者直接混合不相容,整体呈浑浊状态,此时,加入卡必醇后,其强极性的羟基与巯基结合在一起,受结构影响,其另外一端有机链与逆酯锡的长烃链结合在一起,最终得到透明清亮的联合有机锡稳定剂。(The invention discloses a combined organic tin stabilizer and a preparation method thereof. The combined organic tin stabilizer comprises the following raw materials in percentage by mass: methyl tin mercaptide: reverse ester tin: octyl mercapto acid: the carbitol is 63-80: 11-17: 11-20: 6 to 12. The preparation method comprises the following steps: s1: firstly, adding the methyltin mercaptide and the octyl mercaptide in the mass ratio, and stirring and mixing; s2: to the mixture obtained in S1, carbitol and tin retro-ester in the above-mentioned mass ratio were added, and stirring was continued. Because the structure of the reverse ester tin and the methyl tin mercaptide is a reverse structure, the reverse ester tin and the methyl tin mercaptide are influenced by electronegativity of tin elements, carbonyl positions and the length of organic chains, the clear tin elements and the carbonyl positions are directly mixed and incompatible, the whole is in a turbid state, at the moment, after the carbitol is added, the strongly polar hydroxyl and the mercapto are combined together and influenced by the structure, the organic chain at the other end of the carbitol is combined with the long hydrocarbon chain of the reverse ester tin, and finally, the transparent and clear combined organic tin stabilizer is obtained.)

1. The combined organic tin stabilizer is characterized by comprising the following raw materials in percentage by mass: methyl tin mercaptide: reverse ester tin: octyl mercapto acid: the carbitol is 63-80: 11-17: 11-20: 6 to 12.

2. An organotin-combined stabilizer according to claim 1 wherein said methyltin mercaptide is a transparent liquid having a density at 20 ℃ of from 1.150 to 1.200g/cm³And a viscosity at 25 ℃ of not more than 110 mPas.

3. An organotin-combined stabilizer according to claim 2, wherein said tin retro-ester is a transparent liquid having a density at 20 ℃ of from 1.000 to 1.150g/cm³And a viscosity at 25 ℃ of not more than 110 mPas.

4. An organotin-combined stabilizer according to claim 3, wherein said octyl mercaptide is a transparent liquid and has a density of 0.960 to 0.980g/cm at 20 ℃³And an acid value at 25 ℃ of not more than 0.5mg KOH/g.

5. A process for the preparation of a combined organotin stabilizer as claimed in any one of claims 1 to 4, characterized in that it comprises the steps of:

s1: firstly, adding the methyltin mercaptide and the octyl mercaptide in the mass ratio, and stirring and mixing;

s2: to the mixture obtained in S1, carbitol and tin retro-ester in the above-mentioned mass ratio were added, and stirring was continued.

6. The method for preparing an organotin-combined stabilizer according to claim 5, wherein the stirring temperature in the steps S1 and S2 is 60 to 90 ℃ and the rotation speed is 15 to 30 rpm.

7. The method for preparing a combined organotin stabilizer according to claim 6, wherein the stirring time in the step S1 is 0.5 to 1 hour.

8. The method for preparing a combined organotin stabilizer according to claim 7, wherein the stirring time in the step S2 is 1 to 1.5 hours.

9. The method for preparing the combined organotin stabilizers according to claim 5, wherein the density of the combined organotin stabilizer at 20 ℃ is from 1.000 to 1.200g/cm³And a viscosity at 25 ℃ of not more than 130 mPas.

Technical Field

The invention relates to the technical field of PVC heat stabilizers, in particular to a combined organic tin stabilizer and a preparation method thereof.

Background

After the heat stabilizer is added in the processing process of PVC, the normal processing of PVC can be ensured and the corresponding product performance can be obtained.

The organic tin stabilizer, in particular to maleate and mercaptan organic tin, is a PVC stabilizer with better transparency, and is mainly used in hard transparent products; metal soaps have transparency, but are less transparent than organotin and are used in translucent articles; inorganic lead salts are opaque and can only be used in opaque articles. The organotin stabilizers are of various types and have very different transparency.

Disclosure of Invention

The present invention is directed to overcoming the above-mentioned disadvantages of the prior art and providing a combined organotin stabilizer having excellent initial coloring properties and maintaining high transparency of PVC products and a method for preparing the same.

The combined organic tin stabilizer comprises the following raw materials in percentage by mass: methyl tin mercaptide: reverse ester tin: octyl mercapto acid: the carbitol is 63-80: 11-17: 11-20: 6 to 12.

Further, the methyl tin mercaptide is transparent liquid, and the density at 20 ℃ is between 1.150 and 1.200g/cm³And a viscosity at 25 ℃ of not more than 110 mPas.

Further, the reverse ester tin is transparent liquid, and the density at 20 ℃ is 1.000-1.150g/cm ³And a viscosity at 25 ℃ of not more than 110 mPas.

Further, the octyl thioglycolate is transparent liquid, and the density at 20 ℃ is 0.960-0.980g/cm³And an acid value at 25 ℃ of not more than 0.5mg KOH/g.

The preparation method of the combined organic tin stabilizer comprises the following steps:

s1: firstly, adding the methyltin mercaptide and the octyl mercaptide in the mass ratio, and stirring and mixing;

s2: to the mixture obtained in S1, carbitol and tin retro-ester in the above-mentioned mass ratio were added, and stirring was continued.

Further, in the steps S1 and S2, the stirring temperature is 60-90 ℃, and the rotation speed is 15-30 rpm.

Further, the stirring time in the step S1 is 0.5-1 h.

Further, the stirring time in the step S2 is 1-1.5 h.

Further, the density of the combined organic tin stabilizer at 20 ℃ is between 1.000 and 1.200g/cm³And a viscosity at 25 ℃ of not more than 130 mPas.

Compared with tin element, the combined organic tin stabilizer provided by the invention has the advantages that the structure of reverse ester tin and methyl tin mercaptide is a reverse structure, the direct mixing of the tin element electronegativity, the carbonyl position and the organic chain length is incompatible, and the whole stabilizer is turbid. At this time, after the carbitol is added, the strongly polar hydroxyl group and the sulfhydryl group are combined together and are influenced by the structure, the organic chain at the other end of the carbitol is combined with the long hydrocarbon chain of the tin retro-ester, finally, the methyl tin mercaptide treated by the octyl mercaptoate and the tin retro-ester are connected into a whole, and finally, the transparent and clear combined organic tin stabilizer is obtained.

Detailed Description

The following are specific examples of the present invention and further describe the technical solutions of the present invention, but the present invention is not limited to these examples.