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Insect-repelling waterborne wood coating

A wood coating, water-based technology, applied in the field of coatings, can solve the problems of volatile solvent waste, short extraction time, pyrethrin degradation, etc., and achieve the effects of high efficiency, stability, high extraction rate, and conventional equipment.

Inactive Publication Date: 2017-01-11
安吉威龙塑木环保材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Chinese patent CN1657518A discloses a method for extracting pyrethrins with an organic solvent under microwave radiation conditions. It has the advantages of simple process route, short extraction time, less solvent consumption, high solvent recovery rate and high product extraction rate. However, microwave extraction The solvent is volatile and wasteful, and excessive doses of microwave radiation will lead to partial degradation of pyrethrins

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] (1) After drying 400g of pyrethrum petals at 100°C for 30 minutes, crush them through an 80-mesh sieve to obtain 260g of pyrethrum flower powder;

[0029] (2) Put 200g of pyrethrum flower powder, 10g of cellulase, 1176g of ethyl acetate and 824g of n-octane in a Soxhlet extractor, heat to reflux, and at the same time irradiate with ultraviolet light for 50min, continue to reflux for 5 hours and take The extract is ready for use;

[0030] (3) Distill the extract to collect 1004g of 75~80℃ distillate as ethyl acetate, 792g of 122~130℃ distillate as n-octane, and the rest as pyrethrins with a weight of 7.7g.

[0031] (4) 6g pyrethrins were dissolved in 30g ethanol to obtain 36g pyrethrin-ethanol solution, 10g chitosan was dissolved in 200g 3wt% acetic acid aqueous solution to obtain 210g chitosan aqueous solution, and 36g pyrethrin-ethanol solution The solution is uniformly mixed with 210 g of chitosan aqueous solution, and spray-dried to obtain 15.6 g of pyrethrin-loaded...

Embodiment 2

[0034] (1) After drying 400g of pyrethrum petals at 105°C for 25 minutes, crush them through a 90-mesh sieve to obtain 250g of pyrethrum flower powder;

[0035] (2) Put 200g of pyrethrum flower powder, 14g of cellulase, 1600g of ethyl acetate and 800g of n-octane in a Soxhlet extractor, heat to reflux, and at the same time irradiate with ultraviolet light for 40min, continue to reflux for 6 hours and take The extract is ready for use;

[0036] (3) Distill the extract to collect 1440g of 75~80℃ distillate as ethyl acetate, 744g of 122~130℃ distillate as n-octane, and the remainder as pyrethrins with a weight of 8.04g.

[0037] (4) Dissolve 6g pyrethrins in 24g ethanol to obtain 30g pyrethrin-ethanol solution, dissolve 10g chitosan in 150g 3wt% acetic acid aqueous solution to obtain 160g chitosan aqueous solution, and dissolve 30g pyrethrin-ethanol The solution is uniformly mixed with 150 g of chitosan aqueous solution, and spray-dried to obtain 14.8 g of pyrethrin-loaded chito...

Embodiment 3

[0040] (1) After drying 400g of pyrethrum petals at 110°C for 20 minutes, crush them through a 100-mesh sieve to obtain 244g of pyrethrum flower powder;

[0041] (2) Put 200g of pyrethrum flower powder, 16g of cellulase, 1666g of ethyl acetate and 1334g of n-octane in a Soxhlet extractor, heat to reflux, and at the same time irradiate with ultraviolet light for 60min, continue to reflux for 4 hours and take The extract is ready for use;

[0042](3) Distill the extract to collect 1600g of 75~80℃ distillate as ethyl acetate, 1282g of 122~130℃ distillate as n-octane, and the remainder as pyrethrins, weighing 7.89g.

[0043] (4) 6g pyrethrins were dissolved in 36g ethanol to obtain 42g pyrethrin-ethanol solution, 10g chitosan was dissolved in 180g 3wt% acetic acid aqueous solution to obtain 190g chitosan aqueous solution, and 36g pyrethrin-ethanol solution The solution was uniformly mixed with 144 g of chitosan aqueous solution, and spray-dried to obtain 13.2 g of pyrethrin-loade...

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Abstract

The invention provides an insect-repelling waterborne wood coating. The insect-repelling waterborne wood coating is prepared from components in parts by weight as follows: 20-25 parts of a styrene-acrylic emulsion, 8-10 parts of an insect-repelling agent, 1-2 parts of a dispersant, 0.8-1.5 parts of a defoamer, 1-3 parts of a coalescing agent, 0.5-1.5 parts of benzophenone and 59-66 parts of water; the insect-repelling agent is chitosan with pyrethrin supported. A preparation method of the insect-repelling waterborne wood coating comprises steps as follows: pyrethrin is dissolved in ethanol, a pyrethrin-ethanol solution is prepared, chitosan is dissolved in a 3wt% acetic acid water solution, and a chitosan water solution is prepared, the pyrethrin-ethanol solution and the chitosan water solution are mixed uniformly, spray drying is performed, and the chitosan with pyrethrin supported is obtained. The provided insect-repelling waterborne wood coating adopts the chitosan with pyrethrin supported as the insect-repelling agent and has the characteristics of being low in toxicity, safe, efficient and high in stability, besides, pyrethrin has a slow release efficacy, and the insect-repelling time of the coating can be prolonged.

Description

technical field [0001] The invention belongs to the technical field of coatings, in particular to a water-based wood coating, in particular to an insect-proof water-based wood coating. Background technique [0002] As an important part of the coatings industry, wood coatings are mainly used in furniture, doors and windows, floors, wooden musical instruments, toys and so on. Wood coatings are divided into solvent-based coatings and water-based coatings. Solvent-based coatings have excellent leveling properties, smooth paint films, strong permeability, good adhesion, full gloss, and high hardness. However, solvent-based coatings contain 40% -70% organic solvents will volatilize into the surrounding environment and atmosphere during the coating process, seriously endangering the environment and human health. In view of the hazards of solvent-based paints, researchers have developed new water-based paints. Using water to replace organic solvents fundamentally solves the harm o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D125/14C09D5/14A01N25/10A01N65/12A01P7/04A01P17/00
CPCC09D125/14A01N25/10A01N65/00A01N65/12C08L2205/03C09D5/14C08L71/02C08K9/12C08K5/12
Inventor 黄树瑛
Owner 安吉威龙塑木环保材料有限公司
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