CN1472255A

CN1472255A - Low-melting heat sensitive wax

Info

Publication number: CN1472255A
Application number: CNA021258457A
Authority: CN
Inventors: 杨文中; 程志斌; 丁洛; 杨焜远
Original assignee: Sinopec Research Institute of Petroleum Processing; China Petroleum and Chemical Corp
Current assignee: Sinopec Research Institute of Petroleum Processing; China Petroleum and Chemical Corp
Priority date: 2002-07-30
Filing date: 2002-07-30
Publication date: 2004-02-04
Anticipated expiration: 2022-07-30
Also published as: CN1224644C

Abstract

A thermosensitive wax with low smelting point is prepared from basic soft wax, crystal improver, viscosity increaser and thermal conducting agen through proportional mixing at 100-150 deg.C, stirring for 20-300 min, and cooling. Its advantages are high toughness, good moulding and demoulding performance, and moderate expansability.

Description

A kind of low-melting heat sensitive wax

Technical field

The present invention relates to a kind of composition of wax, more specifically to a kind of particularly low-melting heat sensitive wax of water-heater automatic constant temperature unsteady flow amount temperature-sensing valve of automatic temp controller that is used for.

Background technology

Wax product has a wide range of applications on daily life and industrial production.Semi-refined, paraffin wax fully refined and Microcrystalline Wax product that the multiple trade mark is arranged on the market, but these wax products of producing by national standard, No. 52 waxes that fusing point is minimum, its fusing point also requires to be not less than 52 ℃, is not suitable for lesser temps and uses.Polyethylene wax, Poly Propylene Wax, the wax of these synthetic, fusing point are generally more than 100 ℃.Above-mentioned various wax at room temperature is the frangible product with higher hardness of pressurized.Other animal wax, vegetable wax be at aspects such as fusing point, toughness, price, thermal conductivity, the also difficult service requirements of satisfying low-melting heat sensitive wax.At present, the low melt wax of selling on the market mainly contains soap manufacturing paraffin, it is to be made through technologies such as cold press dewaxing, urea dewaxing or solvent dewaxings by light ends oil, though the soap manufacturing paraffin that has can satisfy the fusing point requirement of low melt wax, but there is more shortcoming: at first be that crystal is thick, be big sheet more, disperse very much, be difficult to extrusion molding during use, can not be squeezed into cere substantially; Secondly oleaginousness is higher, is pressed with more oil during moulding and separates out, difficult the use; Have the coefficient of expansion less again, can't satisfy temperature control with wax to the expansible requirement.

Summary of the invention

The objective of the invention is at the problems referred to above, propose a kind of low-melting heat sensitive wax, this wax has extraordinary toughness, the extrusion molding and the demoulding well under the room temperature, and expansion character is moderate.

Low-melting heat sensitive wax provided by the invention is made up of the basic soft wax of 45～99 heavy %, the crystal improving agent of 0.2～10 heavy %, the tackifier of 0.5～30 heavy %, the thermal conducting agent of 0.3～15 heavy %.

Low-melting heat sensitive wax is under 100～150 ℃ the basic soft wax of 45～99 heavy %, the crystal improving agent of 0.2～10 heavy %, the tackifier of 0.5～30 heavy %, the thermal conducting agent of 0.3～15 heavy % to be mixed, and stirs 20～300 minutes postcooling.

This product at room temperature has extraordinary toughness, good moulding property, release property, the moderate coefficient of expansion.

Embodiment

Described basic soft wax is after decompression one line, decompression two wires, the three-way sweat oil of decompression mix separately or by a certain percentage, 25 ℃ of following natural subsidence 10～100 hours, separating for several times is fuel-displaced therebetween, collected soft wax is continued to obtain basic soft wax 38 ℃ of left and right sides de-oilings, and this process is not used any solvent.

Described crystal improving agent is mainly polymethacrylate solid-state under the normal temperature or poly-alpha olefins class.

Described tackifier are one or more mixtures that are selected from paraffin, polyisobutene, rosin, staybelite, polyethylene, the polypropylene.Wherein paraffin is one or more the mixture in No. 52, No. 54, No. 56, No. 58 full refining wax.

Described thermal conducting agent is a super-fine metal powder, and as superfine aluminium power, copper powder, zinc powder, iron powder etc., the maximum particle diameter of super-fine metal powder is less than 25 μ m.

The fusing point of this product is 35～45 ℃ preferably 38～42 ℃, extraordinary toughness is at room temperature arranged, good moulding property, release property, so-called moulding property, release property, be meant the product fusing after, join in the mould, and 20～25 ℃ of constant temperature 30 minutes, after the extrusion extrusion molding, the wax work that obtains is level and smooth, complete, the adhesion mould.The coefficient of expansion is moderate, and in certain temperature range, the expansion of volume is directly proportional with the rising of temperature substantially, and general volume change is 7～16v%.This product can be widely used in the temperature control wax under the lesser temps, and susceptibility is good.Raw material sources are extensive, and production method is simple, and are pollution-free, nontoxic, nuisanceless.

The following examples will give further instruction to present method, but therefore not limit present method.

Embodiment 1

The used basic soft wax of this embodiment is to be initial raw material 20 ℃ of following natural subsidence 50 hours with decompression two wires sweat oil, constantly removes the oil of separating out and obtains basic soft wax, this basis soft wax oil-containing 1.08 heavy %.

Under 120 ℃, the basic soft wax of 85.6 heavy %, the crystal improving agent polymethacrylate of 0.4 heavy %, No. 52 full refining waxes of tackifier of 4.0 heavy %, the tackifier polyisobutene of 6.0 heavy %, the thermal conducting agent superfine cupper powder of 4.0 heavy % are mixed, stir 100 minutes postcooling.Product section character is as follows: in the use temperature scope, cubical expansivity is 12%, and film-forming properties is 17cm ²/ g, fusing point are 38.9 ℃.

Embodiment 2

The used basic soft wax of this embodiment is to be initial raw material 20 ℃ of following natural subsidence 50 hours with the three-way sweat oil that reduces pressure, and constantly removes the oil of separating out and obtains basic soft wax, this basis soft wax oil-containing 1.15 heavy %.

Under 120 ℃, the basic soft wax of 75.4 heavy %, the crystal improving agent poly-alpha olefins of 0.6 heavy %, No. 54 full refining waxes of tackifier of 19.6 heavy %, the tackifier polyisobutene of 0.9 heavy %, the thermal conducting agent superfine cupper powder of 3.5 heavy % are mixed, stir 90 minutes postcooling.Product section character is as follows: in the use temperature scope, cubical expansivity is 9%, and film-forming properties is 16cm ²/ g, fusing point are 40.5 ℃.

Embodiment 3

The used basic soft wax of this embodiment is that mixed the back by weight 1: 1 be initial raw material 20 ℃ of following natural subsidence 50 hours with decompression two wires, the three-way sweat oil of decompression, constantly removes the oil of separating out and obtains basic soft wax, and this basis soft wax oil-containing 1.22 weighs %.

Under 140 ℃, the basic soft wax of 85.0 heavy %, the crystal improving agent polymethacrylate of 2.0 heavy %, No. 56 full refining waxes of tackifier of 7.0 heavy %, the tackifier rosin of 3.5 heavy %, the thermal conducting agent superfine aluminium power of 2.5 heavy % are mixed, stir 150 minutes postcooling.Product section character is as follows: in the use temperature scope, cubical expansivity is 13%, and film-forming properties is 15cm ²/ g, fusing point are 41.0 ℃.

Claims

1, a kind of low-melting heat sensitive wax is characterized in that being made up of the basic soft wax of 45～99 heavy %, the crystal improving agent of 0.2～10 heavy %, the tackifier of 0.5～30 heavy %, the thermal conducting agent of 0.3～15 heavy %.

2,, it is characterized in that described basic soft wax is to be selected from decompression one line, decompression two wires, decompression one or more the sweat oil among three-way to get solid gained after the de-oiling mutually in 10～100 hours 25 ℃ of following natural subsidence according to the low-melting heat sensitive wax of claim 1.

3,, it is characterized in that described crystal improving agent is polymethacrylate or a poly-alpha olefins class solid-state under the normal temperature according to the low-melting heat sensitive wax of claim 1.

4,, it is characterized in that described tackifier are one or more mixtures that are selected from paraffin, polyisobutene, rosin, staybelite, polyethylene, the polypropylene according to the low-melting heat sensitive wax of claim 1.Wherein paraffin is one or more the mixture in No. 52, No. 54, No. 56, No. 58 full refining wax.

5, according to the low-melting heat sensitive wax of claim 1, it is characterized in that described thermal conducting agent is a super-fine metal powder, the maximum particle diameter of super-fine metal powder is less than 25 μ m.

6,, it is characterized in that described super-fine metal powder is one or more the mixture in superfine aluminium power, superfine cupper powder, super-fine zinc dust, the superfine iron powder according to the low-melting heat sensitive wax of claim 5.

7, the described low-melting heat sensitive wax preparation method of a kind of claim 1, it is characterized in that under 100～150 ℃, the basic soft wax of 45～99 heavy %, the crystal improving agent of 0.2～10 heavy %, the tackifier of 0.5～30 heavy %, the thermal conducting agent of 0.3～15 heavy % being mixed, stir 20～300 minutes postcooling.