CN1228369C - Polyethylene film no-drip composition - Google Patents

Abstract

The invention relates to a polyethylene greenhouse film dripless agent composition. Comprises the following components: a maleic anhydride alcohol ether ester mixture having the structural formula: r (EO)_mOOCCH＝CHCOO(EO)_mR; (B) a higher alcohol ether mixture having the formula: r (EO)_mOH; wherein R is C₁₀～C₂₆The linear alkyl group of (1); m is 3 to 25; e0 is ethylene oxide; the weight ratio of the component (A) to the component (B) is 8-19: 1. When the non-dropping agent composition is applied to a polyethylene greenhouse film, a main surfactant maleic anhydride alcohol ether ester in the composition is bonded with a polyethylene molecular chain through covalent chemical bondsThe polarity and the affinity with water of the polyethylene greenhouse film are increased, and segregation and loss are avoided, so that the non-drip service life of the polyethylene greenhouse film is synchronous with the service life of the polyethylene greenhouse film, and the permanent non-drip polyethylene greenhouse film can be prepared.

Description

Polyethylene film no-drip composition

technical field

The invention relates to a non-drip composition of polyethylene greenhouse film.

Background technique

At present, the non-drip function of polyethylene shed film is basically achieved by simply adding high-level polyols and their esters of organic small molecule compounds. These compounds include glycerin fatty acid esters, sorbitol side fatty acid Monoester, ethylene oxide adduct of sorbitan monoester. Due to the large difference in polarity between the non-drip agent and the base resin, no free radical reactivity, hydrophilicity, and the surfactant in it does not chemically bond with polyethylene, migration and surface loss are extremely prone to occur, Therefore, the drip-free life of this polyethylene shed film is short, generally 3-4 months.

Contents of Invention

In order to solve the above-mentioned problems in the prior art and increase the non-drip life of polyethylene shed film, the present invention provides a polyethylene shed film non-drip composition whose main surfactant can be grafted with polyethylene molecules.

The non-drip composition of polyethylene greenhouse film provided by the invention contains following components:

(A) maleic anhydride alcohol ether ester mixture, structural formula is:

R(EO) _m OOCCH=CHCOO(EO) _m R

(B) higher carbon alcohol ether mixture, structural formula is:

R(EO)mOH;

In the formula, R is a C ₁₀ -C ₂₆ linear alkyl group; m is 3-25; EO is ethylene oxide; the weight ratio of component (A) to component (B) is 8-19:1.

R in the component (A) is preferably a C ₁₄ -C ₂₄ linear alkyl group.

The present invention also provides a preparation method of polyethylene greenhouse film drip-free composition, the method comprising:

A, maleic anhydride, higher carbon alcohol ether, solvent, catalyst, polymerization inhibitor, antioxidant are added in the reactor;

B. The mixture in the reactor is subjected to esterification reaction at 120-140°C;

C. The solvent is removed from the reaction mixture under reduced pressure to obtain the desired composition.

Solvent among the present invention can be toluene, cyclohexane etc., also can be their mixture, preferably toluene; Solvent consumption is about 100% of the total weight of maleic anhydride and higher alcohol ether. The catalyst used may be an acid catalyst, such as p-toluenesulfonic acid, etc.; the amount of the catalyst is generally 0.6-2.2% of the total weight of higher alcohol ether and maleic anhydride. The molar ratio of maleic anhydride to higher alcohol ether is 1: (2.0～2.5). Inhibitor is hydroquinone. Antioxidant is tetrakis-[3-(3′,5′-di-tert-butyl-4′-hydroxyphenyl) propionic acid]-pentaerythritol ester (trade name: antioxidant 1010), β(4-hydroxy-3,5-di-tert-butylphenyl) n-octadecyl propionate (trade name: Antioxidant 1076), bis(2,4-di-tert-butylphenyl) ) pentaerythritol diphosphite (trade name: antioxidant 626), tris(2,4-di-tert-butylphenyl) phosphite (trade name: antioxidant 168), distearyl pentaerythritol phosphite (trade name: Antioxidant 618) or a mixture thereof. The feeding method of the reactants can be added all at once.

According to the needs of use, in order to make the composition of the present invention more effective, other additives can also be added in the composition, such as: Tween-20, Tween-60, Tween-80, plasticizer (phthalate formates, phosphates, dicarboxylic acid esters). Light stabilizers can also be added, such as hindered amine compounds: polysuccinic acid (4-hydroxy-2,2,6,6-tetramethyl-1-piperidinyl) ester (trade name: 622) or poly -{[6-[(1,1,3,3-tetramethylbutyl)-imino]-1,3,5-triazine-2,4-diyl][2-(2,2, 6,6-tetramethylpiperidinyl)-nitrilo]-hexamethylene-[4-(2,2,6,6-tetramethylpiperidinyl)-nitrilo]} (trade name: 944 )wait.

The non-drip composition of the present invention can use the method of reactive extrusion to graft the maleic anhydride alcohol ether ester on the polyethylene molecular chain. The addition amount of the non-drip composition to polyethylene is generally 0.6% to 2.0% by weight, preferably 0.8% to 1.4% by weight.

When the non-drip composition in the present invention is applied to the polyethylene shed mold, the main surfactant maleic anhydride alcohol ether ester in the composition is bonded together with the polyethylene molecular chain through a covalent chemical bond. During the crystallization process of polyethylene, these functional groups are all located on the surface of polyethylene crystals due to the repulsion of polyethylene molecular chains, which increases the polarity of the polyethylene film and the affinity with water, so that the polyethylene film is easily absorbed by water. It is infiltrated and spread on its surface to form a water film, realizing the function of no dripping. Simultaneously because the main surface active agent maleic anhydride alcohol ether ester of polyethylene shed film non-drip composition provided by the invention can graft with polyethylene molecule, segregation and loss can not take place, thereby its no-drip life-span and polyethylene shed The life of the membrane itself is synchronized, and a permanent drip-free polyethylene shed membrane can be produced.

Detailed ways

Example 1

Preparation of polyethylene shed film no-drip composition:

With 49.0g (0.5mol) maleic anhydride, 346.5g (1.05mol) alcohol ether and 400g toluene, catalyst p-toluenesulfonic acid 8.0g, polymerization inhibitor hydroquinone 6.5g, antioxidant 1010 (or use 1076, 626, 168, 618 or their mixture) 3.0g was placed in a reactor equipped with an electric stirrer, a thermometer, a reflux condenser, and a nitrogen gas introduction tube, and nitrogen gas was introduced for 5 to 10 minutes, and a weak nitrogen flow was maintained, and heated Stir, raise the temperature to 120-140°C, reflux the toluene at normal pressure for 3-7 hours, dehydrate 9ml, and the esterification is complete. The esterified product is under vacuum condition P: 0.095Mpa, the toluene is removed, the temperature is lowered in vacuo, and the vacuum is eliminated with nitrogen to obtain the product. 3.0 g of poly(4-hydroxy-2,2,6,6-tetramethyl-1-piperidinyl)ester (trade name: 622) may be added.

The alcohol ether used in this embodiment is a high-carbon alcohol ether product with a trade name of 124n, purchased from Jilin Chemical Industry Co., Ltd. (Jilin) Jilian Petrochemical Co., Ltd., its structural formula: R(EO)mOH R in is 12-14, and m is 3.

Claims (9)

1. A polyethylene greenhouse film drip-free composition, comprising the following components: (A) maleic anhydride alcohol ether ester mixed esterification product, structural formula is R(EO) _m OOCCH=CHCOO(EO) _m R; (B) higher carbon alcohol ether mixture, structural formula is R (EO) _m OH; In the formula, R is a straight-chain alkyl group of C ₁₀ to C ₂₆ ; m is 3 to 25; EO is ethylene oxide; The weight ratio of component A to component B is 8-19:1. 2. A preparation method of polyethylene shed film no-drip composition, the steps are as follows: A, maleic anhydride, higher carbon alcohol ether, solvent, catalyst, polymerization inhibitor, antioxidant are added in the reactor; B. The mixture in the reactor is subjected to esterification reaction at 120-140°C; C, the reaction mixture is desolvated under reduced pressure to obtain the desired composition; Wherein: solvent consumption is 100% of maleic anhydride and higher alcohol ether gross weight, and catalyst consumption is 0.6～2.2% of maleic anhydride and higher alcohol ether gross weight, and the mol ratio of maleic anhydride and higher alcohol ether is 1: (2.0～2.5). 3. the preparation method of composition according to claim 2 is characterized in that solvent wherein is toluene or hexanaphthene. 4. The preparation method of the composition according to claim 2, characterized in that the catalyst used is an acid catalyst. 5. The preparation method of the composition according to claim 4, wherein the catalyst is p-toluenesulfonic acid. 6. The composition preparation method according to claim 2, characterized in that the polymerization inhibitor wherein is hydroquinone. 7. The composition preparation method according to claim 2, wherein the antioxidant is tetrakis-[3-(3',5'-di-tert-butyl-4'-hydroxyphenyl) propionic acid] - pentaerythritol ester or n-octadecyl β-(4-hydroxy-3,5-di-tert-butylphenyl)propionate, bis(2,4-di-tert-butylphenyl)pentaerythritol diphosphite, Tris(2,4-di-tert-butylphenyl) phosphite, distearyl pentaerythritol phosphite or mixtures thereof. 8. The composition preparation method according to claim 2, characterized in that a light stabilizer can be added. 9. The preparation method of the composition according to claim 8, wherein the light stabilizer is a hindered amine compound.